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  • 301.
    Linderholt, Andreas
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Olsson, Jörgen
    RISE Research Institutes of Sweden AB.
    A simulation based study of low frequency transient sound radiation from floors: a concrete vs. a hybrid floor2017In: Proceedings of the 24th International Congress on Sound and Vibration, Curran Associates, Inc., 2017Conference paper (Other academic)
    Abstract [en]

    Timber is a renewable and human friendly construction material and thereby a potential solution toachieve life cycle sustainable buildings. However, it is clear that impact sound and vibrations withinthe low frequency range still are challenges for wooden joist floors. Another challenge is the,mostly, larger building heights of wooden or hybrid floors compared to the heights of concretefloors. Using timber as the structural joist floor material could imply fewer stories due to maximumallowed building heights, which renders in less income in a building project. Accurate simulationsof impact sound may decrease the need for prototypes; thus saving money and time in the timberbuilding industry. Here, a hybrid joist floor consisting of wood, sand and steel is compared to aconcrete floor in terms of radiated impact sound into a rectangular cavity. The hybrid floor is designedsuch that its mass distribution and global stiffness are close to the same properties of theconcrete floor. Finite element models are used for simulations of the radiated transient sound inducedby impact forces having the characteristics of human walking. The simulations indicate thatsimilar surface mass and bending stiffness of a floor intersection give similar impact sound transmissionproperties around the first bending mode, while it is not necessary so at higher frequencies.Keywords: timber buildings, impact sound, simulation

  • 302.
    Linderholt, Andreas
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Olsson, Jörgen
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Combining testing and calculation for of low frequency sound and vibrations in timber buildings2018In: Forum Wood Building Nordic 2018, 27-28 September 2018, Växjö, Sweden, 2018Conference paper (Other (popular science, discussion, etc.))
  • 303.
    Linderholt, Andreas
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Scheel, Maren
    Chalmers University of Technology, Sweden.
    Johansson, Anders
    Chalmers University of Technology, Sweden.
    Effects of Interface Loading in Dynamic Substructuring2015In: ICoEV 2015: International Conference on Engineering Vibration, (ICoEV) 2015 Ljubljana, 7-10 September, 2015 / [ed] Miha Boltezar, Ljubjana: University of Ljubljana , 2015Conference paper (Other academic)
    Abstract [en]

    Over the last few IMAC conferences, the SEM substructuring focus group’s benchmark; the Ampair A600 wind turbine, has been thoroughly studied, at substructure as well as system levels but also by implementation of different substructuring techniques for assembling experimental and/or analytical component models.

    Within the focus group, work dedicated to appropriate interfacing between substructures has furthermore been an area of increased interest. This is notable through the use of the transmission simulator method. This paper draws on that paradigm in studying the end effects on assembled structures of using nominally identical substructure models derived from experimental setups with different levels of mass loading at the interface. Specifically, experimental models for an A600 blade and bracket system attached to dummy masses of different sizes are coupled to an analytical model of the hub. The results are compared to analytical results of the full system.

  • 304.
    Linse, Isak
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Haraldsson, Victor
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Automatisering av en industri: -Hur produktionen och företaget påverkas2017Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Trenden går mot att västvärlden utsätts mer och mer för hård konkurrens från lågkostnadsländer inom tillverkningsindustrin. Det krävs därför att företagen arbetar med olika strategier och metoder som får dem att fortfarande vara lönsamma utan att behöva omlokalisera. I den här rapporten utreds ett exempel på hur en investering med hjälp av förbättringsarbete inom ergonomi, kvalitet, flexibilitet och lönsamhetsbedömt underlag kan hjälpa ett industriföretag att sänka sina kostnader på lång sikt och bli mer konkurrenskraftiga.

  • 305.
    Lundgren, Carl-Michael
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Idung, Henrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Kapacitetsutveckling av en befintlig produktionsresurs vid ett tillverkande företag: En fallstudie vid Viking Beds AB2014Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Fallstudien är utförd på Vikings Beds AB med syftet att få förståelse över vilka resurser som påverkar en produktionsresurs när ett tillverkande företag vill öka omsättningen.

    Först kartlades nuläget genom kartläggning av lagerhantering och materialstyrning. Med hjälp av dessa två metoder skapades ett layoutflödesdiagram som gav en uppfattning om vilka faktorer som påverkade vilka i flödet. Genom en TAK-analys kunde tillgängligheten betraktas som flödets huvudproblem.

    Med den slutsatsen utformades sedan rekommendationer innehållandes ställtidsreduktioner, flashhalsoptimering samt materialstyrningsmetoder. Dessa metoder ska förhoppningsvis hjälpa Viking Beds nå ökad omsättning.

     

  • 306.
    Luu, Alan
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Ragnarsson, John
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Effektivisering av informationsflödet hos ett företag med produktvariation: Fallstudie på A-hus AB2017Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Syftet med denna studie är att identifiera ett företags informationsflödet och ta fram förbättringsförslag. Företaget har en hög efterfrågan på deras produkter och en effektivisering av projekteringsarbetet gör att företaget lättare kan möta kommande utmaningar. Vid studier konstaterades det att problem skapas mellan arkitekt och konstruktör när det blir så kallat specialprojekt samtidigt som det saknades standardiserat arbete. Genom de presenterade förbättringsförslagen kan informationsflödet göra betydande effektiviseringar.

  • 307.
    Maczugowski, Maciej
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Numerical simulation of residual stresses in a weld seam: An application of the Finite Element Method2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Articulated haulers are fundamental equipment to transport material. The load carrying structure on a hauler consists mainly of welded frames. During welding of the frames high residual stress will be introduced. These stresses may have a significant impact on the fatigue life of the frames. This is the reason for having good knowledge of the weld residual stresses. The finite element method was used to calculate the residual stress distributions in a butt weld and a T-join weld. Simulation of the welding process with thermal and mechanical analysis was prepared by means of welding GUI implemented in LS-PrePost.

    The welding simulation is a computer intensive operation with high CPU time. That is why it is important to investigate which process factors that have the largest impact on welding simulation results. The aim of this thesis is to investigate the correlation between designed models in FEA software with published results of weld residual stress measurements and conclude which parameters should be mainly taken into consideration.

  • 308.
    Magalhaes, Ana
    et al.
    University West, Sweden.
    De Backer, Jeroen
    University West, Sweden.
    Bolmsjö, Gunnar
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Thermal Dissipation Effect on Temperature-controlled Friction Stir Welding2019In: Soldagem & Inspeção, ISSN 0104-9224, E-ISSN 1980-6973, Vol. 24, p. 1-9, article id e2428Article in journal (Refereed)
    Abstract [en]

    During Friction Stir Welding (FSW) of complex geometries, the thermal dissipation, induced by geometric features or the surrounding environment, may strongly affect the final weld quality. In order to guarantee a consistent weld quality for different conditions, in-process welding parameter adaptation is needed. This paper studies the effect of thermal dissipation, induced by the backing bar thermal conductivity, on the weld temperature and the temperature controller response to it. A new temperature sensor solution, the Tool-Workpiece Thermocouple (TWT) method, was applied to acquire online temperature measurements during welding. An FSW-robot equipped with temperature control, achieved by rotation speed adaptation, was used. AA7075-T6 lap joints were performed with and without temperature control. The cooling rate during welding was register plus macrographs and tensile tests were assessed. The controller demonstrated a fast response promoting the heat input necessary to maintain the set welding temperature. The results demonstrated that temperature control using the TWT method is suitable to achieve higher joint performance and provides a fast setup of optimal parameters for different environments.

  • 309.
    Magnusson, Andreas
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Heller, Simon
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Utveckling av flexibel svetsfixtur2018Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Målet med detta arbete var att ta fram en svetsfixtur till Rottne Industri AB. De hade problem med tillverkningen av sina ramar till deras skördare och skotare. Man använde sig av gamla fixturer som inte var anpassade till alla modeller som svetshäftades. En produktutvecklingscykel användes för att strukturera arbetet och resultatet blev en automatiserad fixtur som kunde implementera sex av de sju ramar som Rottne Industri tillverkar. Fixturen blev ett ergonomiskt lyft för operatörerna och intressanta lösningar med hur man jobbar med fixturer togs fram.

  • 310.
    Magnusson, Anton
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Jonathan, Arnesson
    Utveckla underlag för förbättringar och öka tillgängligheten för en produktionslina2017Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    För att vara konkurrenskraftig måste företag sträva efter att optimera sin produktivitet. Detta kan göras genom att använda uppföljningssystem som underlag för att eliminera produktionsförluster. I fallföretaget har det dock funnits brister i deras system som hindrar förbättringsarbete. Syftet med arbetet var att skapa förståelse hur uppföljningssystem kan tillämpas i en produktion och få förståelse för hur variationer och slöserier påverkar en verksamhet.

    Studien följer en struktur utefter de 4M:en Metod, människa, maskin och material Analysmodellen togs fram för att analysera uppföljningssystemet och utföra experiment med syftet att anpassa systemet för en produktionslina. Studien påvisade också att linan präglas av låg tillgänglighet vilket många gånger kan kopplas till variationer inom de 4M:en. Dessa variationer kan många gånger elimineras genom att tillämpa metoder som beskrivs inom teorikapitlet.

    Experimenten visade att uppföljningssystemet inte var anpassat för produktionslinan och datan kunde därav inte användas som underlag för förbättringar. Därav anpassades systemet så att det i större utsträckning gav relevant data. Denna data kunde sedan användas för att identifiera produktionsförluster.

  • 311.
    Maletic, Damjan
    et al.
    University of Maribor.
    Maletic, Matjaz
    University of Maribor.
    Al-Najjar, Basim
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Gomiscek, Bostjan
    University of Wollongon, Dubai.
    On a design of a maintenance performance measurement system: A sustainability persprctives2017In: 36th International Conference on Organizational Science Development: Responsible Organization / [ed] Iztok Podbregar, University of Maribor Press , 2017, p. 509-518Conference paper (Refereed)
    Abstract [en]

    Measuring maintenance performance is important for companiesto monitor whether their planned objectives are achieved or not. It isessential to have a good overview about the performance of maintenanceprocesses in order to align maintenance objectives with the manufacturingand company’s objectives. This can be attained through a propermaintenance performance measurement system which is consisted ofindicators for measuring and monitoring the important elements of themaintenance function. A framework for maintenance performancemeasurement based on sustainability aspects is proposed. Additionally, anoverview of maintenance indicators is presented. The relevant elementsthat are needed to develop a maintenance performance measurementsystem are discussed in this study as well. Findings derived from this studyhave relevant practical implications as measuring and monitoring ofmaintenance performance measures is vital in detecting the deviations, aswell as to take timely actions, and nevertheless to achieve the desiredobjectives. In this regard, presented maintenance performance indicatorscan be useful for asset managers to develop an effective maintenanceperformance measurement system.

  • 312.
    Maletic, Damjan
    et al.
    University of Maribor, Slovenia.
    Maletic, Matjaz
    University of Maribor, Slovenia.
    Al-Najjar, Basim
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Gomiscek, Bostjan
    University of Maribor, Slovenia.
    The role of maintenance in improving company’s competitiveness and profitability: A case study in a textile company2014In: Journal of Manufacturing Technology Management, ISSN 1741-038X, E-ISSN 1758-7786, Vol. 25, no 4, p. 441-456Article in journal (Refereed)
    Abstract [en]

    Purpose - The purpose of this paper is to examine the role of maintenance in improving company’s competitiveness and profitability. In the first part the paper aims to discuss the potential improvement areas from the company perspective. Second part of this paper examines maintenance impact on company’s business.

    Design/methodology/approach - An empirical case study was utilised aiming to provide an understanding of the role of maintenance in improving company’s business. The empirical data for this study was collected from a Slovenian textile company. A gap analysis was used in order to address the research problem and to identify potential improvement areas.

    Findings - Based on the gap analysis, the results suggest that from respondents’ points of view, maintenance practices related to condition based maintenance (CBM) approach represent the highest opportunity for improvement. The most notable empirical results of the case study showed that around 3 % of additional profit could be generated at weaving machine, especially if all unplanned stoppages and loss of quality due to decrease in the productivity would be prevented.

    Practical implications - This paper demonstrates to managers the potential benefits of maintenance policy in terms of productivity, quality and profitability. In this regard, this paper builds on a premise that company can gain higher performance benefits using more effective maintenance policy.

    Originality/value - The proposed conceptual model contributes to the existing literature by showing the interactions between maintenance and company’s competitiveness and profitability. Empirical findings of this study therefore, acknowledge maintenance’s potential of increasing the overall profit. In addition this study advances prior studies by utilizing a gap analysis which is rare in this type of research.

  • 313.
    Maletic, Damjan
    et al.
    University of Maribor, Slovenia.
    Maletic, Matjaz
    University of Maribor, Slovenia.
    Al-Najjar, Basim
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Gotzamani, Katerina
    University of Macedonia, Greece.
    Gianni, Maria
    University of Macedonia, Greece.
    Kalinowski, T. Bartosz
    University of Lodz, Poland.
    Gomiscek, Bostjan
    University of Wollongong in Dubai, United Arab Emirates.
    Contingency Factors Influencing Implementation of Physical Asset Management Practices2017In: Organizacija, ISSN 1318-5454, E-ISSN 1581-1832, Vol. 50, no 1, p. 3-16Article in journal (Refereed)
    Abstract [en]

    Purpose: The purpose of this empirical study is to examine the role of two contingency factors, i.e. uncertainty andcompetitiveness in relation to physical asset management (PAM) practices as well as to maintenance key performanceindicators. The research is based on a premise that PAM, which was defined by risk management practices,performance assessment practices, life cycle management practices, and policy & strategy practices, has becomean indispensable element of strategic thinking of asset owners as well as maintenance and asset managers. Thepurpose of this study is to advance the understanding of how organizations that face high or low level of uncertaintyand competitiveness respond in terms of PAM deployment.Methodology/Approach: This study employed a data set based on a large-scale survey among organizations insix European countries (i.e. Slovenia, Poland, Greece, Sweden, Turkey and Slovakia). Data were collected from 138organizations located in the above-mentioned countries to conduct the study.Findings: The results show that organizations that are faced with high level of uncertainty and competitiveness aremore engaged in the deployment of PAM practices. Moreover, results show that when organizations are facing highlevels of competitiveness they are using KPIs to a greater extent than organizations under low levels of competitiveness.Originality/value: From a theoretical perspective, this study contributes to the contingency theory by providingempirical evidence whether a context-dependent approach to PAM is needed. The findings also provide insights formanagers on how to respond to the competitive pressure as well as how to customize PAM practices in order to adaptto the changes in dynamic organizational environment.

  • 314.
    Maletic, Damjan
    et al.
    University of Maribor, Slovenia.
    Maletic, Matjaz
    University of Maribor, Slovenia.
    Lvrencic, Viktor
    C&G d.o.o. Ljubljana, Slovenia.
    Al-Najjar, Basim
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Gomiscek, Bostjan
    University of Maribor, Slovenia.
    An application of analytic hierarchy process (AHP) and sensitivity analysis for maintenance policy selection2014In: Organizacija, ISSN 1318-5454, E-ISSN 1581-1832, Vol. 47, no 3, p. 177-188Article in journal (Refereed)
    Abstract [en]

    Purpose – The purpose of this paper is to apply an analytic hierarchy process (AHP) for the evaluation/selection of maintenance policy.

    Methodology/Approach – The paper adopts a case study approach of selecting most appropriate maintenance policy in the case of Slovenian paper mill company. Several steps of the AHP method are used in order to structure the decision making process. Five possible alternatives are considered: failure based maintenance, preventive maintenance, total productive maintenance, reliability centered maintenance and total quality maintenance.

    Findings – This paper proposes a framework for maintenance policy selection based on the AHP methodology. The framework was applied to select the most appropriate maintenance policy in a paper mill company. By performing a sensitivity analysis, it was revealed that the final outcome remained stable in all cases when the weights of the main criteria were increased for 25 percent.

    Originality/value – The paper contributes to the literature by providing a framework for decision making process regarding the maintenance policy selection. In addition, this paper utilizes an exponentially weighted moving average (EWMA) chart for performing a consistency test. Moreover, a sensitivity analysis also presents an important implication of this study.

  • 315.
    Maletič, Damjan
    et al.
    University of Maribor, Slovenia.
    Lovrenčič, Viktor
    C&G D.O.O. Ljubljana, Slovenia.
    Maletič, Matjaž
    University of Maribor, Slovenia.
    Al-Najjar, Basim
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Gomišček, Boštjan
    University of Maribor, Slovenia.
    Maintenance Solutions for Cost-Effective Production: A Case Study in a Paper Mill2015In: Engineering Asset Management - Systems : Professional Practices and Certification: Proceedings of the 8th World Congress on Engineering Asset Management (WCEAM 2013) & the 3rd International Conference on Utility Management & Safety (ICUMAS) / [ed] Tse, PW; Mathew, J; Wong, K; Lam, R; Ko, CN, Springer, 2015, p. 375-385Conference paper (Refereed)
    Abstract [en]

    For companies, in order to stay competitive, it is necessary to continuously increase the effectiveness and efficiency of their production processes. Therefore the purpose of this chapter is to discuss the role of maintenance in achieving the competitive advantages using cost-effectiveness aspect of maintenance process. In this regard, the chapter illustrates/discusses the impact of mechanical and electrical failures on company’s business on an example of a paper mill where processes are running 24/7. Thus, this paper presents the role of vibration-based maintenance (VBM) in enhancing the production and maintenance performance continuously and cost-effectively. Using empirical data collected from a paper mill case study, we found that company could avoid the profit losses even to a greater extent if it would improve the effectiveness of the VBM. With respect to the electrical causes of failures, a live working technique for improving the reliability and availability of the paper machine is proposed. Therefore, maintenance solution concerning the paper machine is suggested and discussed as well as potential benefits are highlighted. The results supported the notion that there is a positive association between the reduction of the unplanned stoppages and potential savings. The results have also shown that there is a need for more systematic approach, and a more holistic view of the maintenance function for establishing and running a cost-effective maintenance policy in the paper mill under consideration.

  • 316.
    Maletič, Damjan
    et al.
    University of Maribor, Slovenia.
    Maletič, Matjaž
    University of Maribor, Slovenia.
    Al-Najjar, Basim
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Gomišček, Boštjan
    University of Wollongong in Dubai, UAE.
    Asset life cycle management: towards improving operational performance2017In: 20th QMOD-ICQSS Conference 2017, 4-7 August, 2017, Helsingör / [ed] Su Mi Dahlgaard-Park and Jens J. Dahlgaard, Lund, Sweden: Lund University Library Press , 2017, p. 1-7Conference paper (Refereed)
    Abstract [en]

    Purpose – The purpose of this paper is to analyse the links between physical asset management policy and strategy, life cycle management of physical assets and operational performance. Even though there is some empirical evidence that physical asset management practices associate with performance outcomes of an organization, there is a need to further explore the interrelationship between physical asset management practices and organizational performance outcomes.Methodology/Approach – The data used in this study were obtained from a research project conducted by a team of international researchers in the field of maintenance and asset management. The target survey population consisted of international e-mail lists of managers across a wide range of functions. In total, 138 usable responses were collected during the given time window. The questionnaire was responded by organizations that are located in located in Slovenia, Poland, Greece, Sweden, Turkey and Slovakia, in portion of 31.9%, 34.1%, 16.7%, 6.5%, 5.8% and 5.1%, respectively. In terms of organizational size (following the guidelines of the Statistical Office of the Republic of Slovenia), 12.2% of the sample was composed of micro-enterprises having five or fewer employees, 17.4% were small-sized organizations employing 50 or less employees, 31.3% were medium sized organizations, employing 51–250 employees, 21.7% organizations were with 251–500 employees and 12.2% organizations were with more than 500 employees. Based upon Slovenian Standard Industrial Classification Codes (SIC), most respondents (39.3%) indicated that their organization is in the manufacturing industry.We applied the Partial Least Squares Path Modeling (PLS-PM) using the R package plspm to assess measurement and structural model (Sanchez, 2013). The method is suitable for studying complex multivariate relationships among observed and latent variables. PLS-PM uses an iterative algorithm that firstly provides weights, loadings and other relevant statistics for estimation of the blocks of the measurement model. Subsequently, PLS-PM algorithm estimates the path coefficients in the structural model (Esposito Vinzi et al., 2010).Findings – Within the scope of PLS-PM measurement model (outer model) assessment, loadings and communalities were checked. As suggested by Sanchez (2013) loadings should be above the value of 0.7. The outer model assessment results (loadings, weights and communalities) for studied constructs are presented in Appendix 1 and 2. According to the results, characteristics of measurement model appears to be suitable for further analysis of PLS-PM. There were a few indicators with loadings just below the recommended value of 0.7, however, they were kept in the measurement model due to content considerations.

  • 317.
    Maletič, Damjan
    et al.
    University of Maribor, Slovenia.
    Maletič, Matjaž
    University of Maribor, Slovenia.
    Al-Najjar, Basim
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Gomišček, Boštjan
    University of Wollongong, Dubai.
    Development of a model linking physical asset management to sustainability performance: An empirical research2018In: Sustainability, ISSN 2071-1050, E-ISSN 2071-1050, Vol. 10, no 12, article id 4759Article in journal (Refereed)
    Abstract [en]

    This article is aimed at exploring the relationship between physical asset management (PAM)practices and sustainability performance. A framework of interrelated constructs was developed basedon the existing literature and consequently tested through empirical study. Survey data were collectedfrom organizations operating in six European countries (i.e., Greece, Poland, Slovakia, Slovenia,Sweden, and Turkey) and analyzed using Partial Least Squares Path Modeling (PLS-PM). The resultsoffer support for the proposed hypotheses, showing that PAM practices positively influence thesustainability performance outcomes, namely economic, environmental, and employee-related socialperformance. Overall, this study demonstrates that a PAM framework can be conceptualized byfour sub-constructs, namely physical asset risk management, physical asset performance assessment,physical asset lifecycle management, and physical asset policy and strategy. Finally, this studybrings to light some theoretical and managerial implications as well as directions for future research.The findings of the study underscore PAM areas in which managers should focus on in order tooptimize costs, performance, and risk exposures concerning the physical assets, and therefore enhancesustainability performance.

  • 318.
    Maletič, Damjan
    et al.
    University of Maribor, Slovenia.
    Maletič, Matjaž
    University of Maribor, Slovenia.
    Al-Najjar, Basim
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Gomišček, Boštjan
    University of Wollongong in Dubai, United Arab Emirates.
    Examination of the Mediating Effects of Physical Asset Management on the Relationship Between Sustainability and Operational Performance2019In: Advances in Manufacturing II: Volume 3 - Quality Engineering and Management / [ed] Hamrol A., Grabowska M., Maletic D., Woll R., Springer, 2019, p. 33-43Conference paper (Refereed)
    Abstract [en]

    This study examines the mediating effects of physical asset management on the relationship between sustainability and operational performance. Using empirical data based on survey data from six European countries (i.e. Greece, Poland, Slovakia, Slovenia, Sweden and Turkey), this study utilized mediation analysis in order to address the research problem. A macro for SPSS was used to estimate the size of an indirect effect of sustainability on operational performance through a mediator (physical asset management). Results of this study show mediator effect of physical asset management on the relationship between sustainability and operational performance. The paper provides valuable insights into mechanism that have a potential to enhance operational performance. The results contribute to a better understanding on how organizations could achieve higher operational performance outcomes by implementing sustainability and physical asset management practices. © 2019, Springer Nature Switzerland AG.

  • 319.
    Maletič, Damjan
    et al.
    University of Maribor, Slovenia.
    Maletič, Matjaž
    University of Maribor, Slovenia.
    Al-Najjar, Basim
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Gotzamani, Katerina
    University of Macedonia, Greece.
    Gianni, Maria
    University of Macedonia, Greece.
    Kalinowski, T. Bartosz
    University of Lodz, Poland.
    Pačaiová, Hana
    Technical University of Kosice, Slovakia.
    Nagyová, Anna
    Technical University of Kosice, Slovakia.
    Gomišček, Boštjan
    University of Wollongong, Dubai.
    The role of contingency factors in physical asset management: An empirical examination2016In: Euromaintenance 2016 proceedings, ARTION Conferences & Events , 2016, p. 93-99Conference paper (Refereed)
    Abstract [en]

    This research presents an empirical study, which examines the role of contingency factors, i.e. uncertainty and competitiveness in relation to physical asset management (PAM) practices. The research is based on a premise that PAM, which comprises of risk management practices, performance assessment practices, life cycle management practices, policy & strategy practices, has become an indispensable element of strategic thinking of asset owners as well as maintenance and asset managers. The purpose of this study is to advance the understanding of how organizations that face high or low level of uncertainty and competitiveness respond in terms of PAM deployment.

    This study employed a data set based on a large-scale survey among organizations in six European countries (i.e. Slovenia, Poland, Greece, Sweden, Turkey and Slovakia). The results show that organizations that are faced with high level of uncertainty and competitiveness are more engaged in the deployment of PAM practices. From a theoretical perspective, this study contributes to the contingency theory by providing empirical evidence whether a context-dependent approach to PAM is needed. The findings also provide insights for managers on how to respond to the competitive pressure as well as how to customize PAM practices in order to adapt to the changes in dynamic organizational environment.

  • 320.
    Maletiča, Damjan
    et al.
    University of Maribor, Faculty of Organizational Sciences, Slovenia.
    Maletič, Matjaž
    University of Maribor, Faculty of Organizational Sciences, Slovenia.
    Lovrenčič, Viktor
    University of Maribor, Faculty of Organizational Sciences, Slovenia.
    Al-Najjar, Basim
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Gomišček, Boštjan
    University of Maribor, Faculty of Organizational Sciences, Slovenia.
    An application of analytic hierarchy process (AHP) and sensitivity analysis for maintenance policy selection2013In: 16th QMOD-ICQSS Proceedings Quality Management and Organizational Development Conference: 4th-6th September 2013, Portoroz, Slovenia / [ed] Su Mi Dahlgaard-Park, Jens J. Dahlgaard, Boštjan Gomišček, Moderna organizacija, Faculty of Organizational Sciences , 2013, p. 1173-1188Conference paper (Refereed)
    Abstract [en]

    Purpose – The purpose of this paper is to apply an analytic hierarchy process (AHP) for the evaluation/selection of maintenance policy.

    Methodology/Approach – The paper adopts a case study approach of selecting most appropriate maintenance policy in the case of Slovenian paper mill company. Several steps of the AHP method are used in order to structure the decision making process. Five possible alternatives are considered: failure based maintenance, preventive maintenance, total productive maintenance, reliability centered maintenance and total quality maintenance.

    Findings – This paper proposes a framework for maintenance policy selection based on the AHP methodology. The framework was applied to select the most appropriate maintenance policy in a paper mill company. By performing a sensitivity analysis, it was revealed that the final outcome remained stable in all cases when the weights of the main criteria were increased for 25 percent.

    Originality/value – The paper contributes to the literature by providing a framework for decision making process regarding the maintenance policy selection. In addition, this paper utilizes an exponentially weighted moving average (EWMA) chart for performing a consistency test. Moreover, a sensitivity analysis also presents an important implication of this study.

  • 321.
    Mastenstrand, Rolf
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Persson, Jonas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Organisationsanpassning mot hållbart och systematiskt förbättringsarbete2016Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Fallstudien på Företaget AB  syftar till att öka förståelsen för de svårigheter  en organisation kan mötas av vid införandet av Lean-konceptet i en verksamhet. Studiens målsättning är att belysa vilka faktorer som påverkar en långsiktigt lyckad implementering av systematiska ständiga förbättringar.

     

    Nulägesbeskrivningen och teorin analyseras ingående för att sammanställas i en slutsats och möjliga rekommendationer till fallföretaget. De påverkansfaktorer vilka författarna lyfter fram  i studien prioriteras i ordning utifrån sin betydelse och diskuteras med avseende på en uthållig implementering av Lean-konceptet.

  • 322.
    Mehinagic, Sanel
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Kunic, Aldin
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Förbättring av arbetsmiljö för en ökad produktivitet2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Ett sätt att konkurrera på den globala marknaden är att ständigt utvecklas. Lean Production används för att ständigt utvecklas och minimera slöserier. Om allt är i ordning och reda reduceras slöserier vilket i sin tur främjar en förbättrad arbetsmiljö. Syfte med studien är att öka förståelsen för vilken effekt en förbättrad arbetsmiljö har på produktivitet. Målet med arbetet är att förbättra arbetsmiljön för att öka produktiviteten. I studien gjordes en nulägesanalys, jämförande mellan nuläge och teori, genomförbarhetsanalys och därefter implementation av förbättringsåtgärder. Med en förbättring av arbetsmiljön i form av ergonomi, ordning och reda samt stress lyckades en förbättring av produktiviteten vid montering ökas med 13,3%

  • 323.
    Merhawi, Henok
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Hasanbegovic, Benjamin
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Ett förslag på ett arbetssätt för en effektiv upplärning av ny produktionspersonal2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    När tillverkningsindustrier växer och behovet ökar, skapas ett kritiskt behov av att träna och instruera nya medarbetare för att möta de önskade kundkraven på kort tid. Trots det har företag svårt att veta vilken upplärningsmetod som är mest lämplig för att snabbt träna oerfaren personal till att arbeta produktivt. Upplärning är en process vars värde underskattas av företagen, och som därmed går miste om konkurrensfördelar som tillkommer vid en effektiv upplärning. 

    Syftet med fallstudien är att få en djupare förståelse för hur ett arbetssätt kan förkorta upplärningsprocessen för ny produktionspersonal och samtidigt säkerställa att arbetet utförs kvalitetssäkert. Författarna kommer att kartlägga den nuvarande upplärningsprocessen med hjälp av kvantitativa och kvalitativa metoder för att därefter analysera informationen och presentera ett förslag på ett framtida arbetssätt vid upplärning.

    Under studien har ett experiment genomförts för att testa ett arbetssätt för upplärning av ny produktionspersonal. Experimentet gav positiva effekter och tillsammans med analysen av data låg det som grund till förbättringsförslaget och viktiga förutsättningarna för en lyckad implementering.

  • 324.
    Mesinovic, Elvedin
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Ceric, Ermin
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Development of plumb elevator shaft2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This degree project is the final part of the bachelor in mechanical engineering at Linnaeus University in Växjö. The project has been accomplished at ALT Hiss AB in Alvesta. The company manufactures hydraulic elevators, less traction elevators and escalators. The purpose of this thesis has been to design a tool that plumbs the elevator shaft. The thesis has been completed with literature studies, interviews and data collections.

    The final concept sketch and idea drawing is presenting the result.

  • 325.
    Mete, Çiğdem
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Dönmez, Selin
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    A model to measure and evaluate the quality of service of healthcare systems in a gynecological clinic: A Case Study 2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In today’s world, there is a strong competition between companies. In this competition environment, it is accepted that one of the most important elements is quality for companies to be differentiated. The company which can produce high quality products or high quality services can survive in this competition. Nevertheless, the situations of being high quality or low quality depends on the tolerance limits which are determined by customers and it can be changed from person to person. In today’s world, even though, when quality concept is considered, the first thing that comes to the minds is “the quality of products”, the fact of quality is not important for only manufacturing companies but also service companies. To be able to comprehend that if the products or the services which are provided by the company satisfy the customers’ needs, the quality should be measured. Nevertheless, when the process of measuring the quality is carried out by experiments, observations and tangible data in the manufacturing companies, there is no tangible data in the service companies to measure the quality. That’s why there are many different models and qualitative approaches that are developed to be able to measure the quality in service companies.

    In the scope of this thesis, a model has been developed to measure the current quality and evaluate the perceived quality of a healthcare company. Developed model is consisted of two main parts which are functional quality and technical quality. Besides, for determining the perceived quality, socio-demographic attributes are also considered. To be able to implement the functional quality part of the model, a survey has been created about the clinic and it has been sent to the patients. And the data about the perceived quality has been gathered from the patients. To be able to implement the technical quality part of the model, interviews with the staff of the clinic have been made and the studies to improve the perceived quality of the clinic, permissions and certificates are identified. Developed model has been tested in the case company and it has been found acceptable. The model ensures to measure the current service quality of the clinic and unveils the areas which cause the low quality in the clinic. Thus, the spots that need to be improved are identified.

  • 326.
    Metso, Lasse
    et al.
    Lappeenranta University of Technology, Finland.
    Kans, Mirka
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    An Ecosystem Perspective on Asset Management Information2017In: Management Systems in Production Engineering, ISSN 2299-0461, Vol. 25, no 3, p. 150-157Article in journal (Refereed)
    Abstract [en]

    Big Data and Internet of Things will increase the amount of data on asset management exceedingly. Data sharing with an increased number of partners in the area of asset management is important when developing business opportunities and new ecosystems. An asset management ecosystem is a complex set of relationships between parties taking part in asset management actions. In this paper, the current barriers and benefits of data sharing are identified based on the results of an interview study. The main benefits are transparency, access to data and reuse of data. New services can be created by taking advantage of data sharing. The main barriers to sharing data are an unclear view of the data sharing process and difficulties to recognize the benefits of data sharing. For overcoming the barriers in data sharing, this paper applies the ecosystem perspective on asset management information. The approach is explained by using the Swedish railway industry as an example.

  • 327.
    Metso, Lasse
    et al.
    Lappeenranta University of Technology .
    Kans, Mirka
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    An ecosystem perspective on asset management information2017In: MPMM 2016, Maintenance, Performance, Measurement & Management: conference proceedings / [ed] Diego Galar, Dammika Seneviratne, Luleå: Luleå tekniska universitet , 2017, p. 69-75Conference paper (Refereed)
    Abstract [en]

    Big Data and Internet of Things will increase the amount of data on asset management exceedingly. Data sharing with an increased number of partners in the area of asset management is important when developing business opportunities and new ecosystems. An asset management ecosystem is a complex set of relationships between parties taking part in asset management actions. In this paper, the current barriers and benefits of data sharing are identified based on the results of an interview study. The main benefits are transparency, access to data and reuse of data. New services can be created by taking advantage of data sharing. The main barriers to sharing data are an unclear view of the data sharing process and difficulties to recognize the benefits of data sharing. For overcoming the barriers in data sharing, this paper applies the ecosystem perspective on asset management information. The approach is explained by using the Swedish railway industry as an example.

  • 328.
    Milani, Mauro
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Optimization of the pressing process of triangular shaped cutting tool inserts2016Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Pressing of metallic powders is a manufacturing process widely investigated in the research field and in the industry. This thesis project is focused on optimizing the pressing process of cemented carbide powder utilized for the production of triangular shaped cutting tool inserts. In particular, the filling of powder into the die cavity was investigated with respect to different pressing parameters. The aim of the project was to obtain a uniform density distribution of the powder into the die cavity, and hence to reduce the variation of the height of the insert obtaining more precise dimension of the latter.

    The tests were carried out at the Sandvik Coromant production department which is the creator of the project. The optimization of the pressing process was performed according to the Design of experiments theory. The dynamic of the sintering process was also investigated.

    The results showed a significant improvement in the filling of the die cavity and a significant decrease of the variation of the height of the inserts. The new insert obtained has more precise dimensions and is able to meet the more demanding requirements of the customers. The results achieved are directly applicable to a larger number of products, and indicate the direction to follow for further development of the manufacturing process.

  • 329. Moniri, Ali
    et al.
    Ehsanifard, Keyvan
    Al-Najjar, Basim
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Innovative DSS Utilising Available Data, Experience and Skills to Enhance Producing Asset Performance Cost-Effectively: A Case Study2014In: Proceedings of the 9th World Congress on Engineering Asset Management (WCEAM) 2014, University of Pretoria Publication , 2014Conference paper (Refereed)
    Abstract [en]

    Although maintenance still in many industries is interpreted as a necessary evil, nowadays by increasing competitions in business, decision-making in maintenance management gets higher priority in order to continuously reduce production cost and increase profit margin. Cost-effective maintenance decisions based on quantitative assessments of maintenance impact on production and its cost improve maintenance status and convert its rule from a cost to a profit-centre. In producing companies, it is vital to consider both economic and technical impact of maintenance to provide better chances for improving company profit margin. In this study, we propose a model, eMaintenance Decision Support System (eMDSS), for assisting companies to achieve these results followed by substantial results from a case study. The model application can be briefed in improvement of decision-making processes from technical and economic perspectives to direct them into the company profitability aligned with the company goals. Further, it proposes technical and economic indicators and improves utilization of maintenance resources including personnel skills and experience to enhance maintenance performance and develop cost-effective scenarios. eMDSS provides an intelligent facilitator which improves accurate decision-making and identifying and prioritizing maintenance problems, investments and follow up them. eMDSS is applied on a real case. Reliability of the achieved results are tested and approved in detail. It is used successful in evaluating previous technical and economic decisions and selecting the most cost-effective scenario with a saving exceeding 133K€ and profit of 114K€ for the case equipment

  • 330.
    Mustafa, Mohamed
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    A Model to Identify Failure & the Root Cause 2017Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Through identifying failure manufacturing companies compete in today’s world to gain beneficial attributes. The purpose if this thesis is to develop a model towards identifying failure and the root cause. The model developed to identify failure and the root cause toward it, which should result it decrease in failure time (nonfunction machine). The developed model has tested and analyzed in a manufacturing company. The model has been established through studies based on preventive and predictive maintenance: FMEA & RCA.

  • 331.
    Nielsen, Sofie
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Beica, Mikaela
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Utveckling av produktionflödeseffektivitet: En fallstudie2014Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    The globalization that exists in the contemporary society means that manufacturing companies in Sweden are forced to look over their production. This to reach a higher competitive advantage and retain jobs nationally. The case study is based on the social problem of an rising unemployment while outsourcing is becoming increasingly popular for manufacturing companies in Sweden. The case company is a medical technology company that manufactures supplies articles to disinfection equipment.

    The case study brings up opinions about what is essential to study in a manufacturing company when a long-term decision on flow efficiency is to be taken. The study aims to create an understanding of how an internal production flow in a manufacturing company can achieve high efficiency. Estimation is to be created on how the actual internal production flow is different in relation to the flow that occurs when processes are transferred externally. The determining between producing internally or removing parts of production must include an review of the factors that affect the company's profitability. Initially it is essential for manufacturing companies to evaluate their current situation carefully to develop in the right direction in the future.

    A disposition model is presented after the theory chapter to structure the work and give the reader a clear view of the coming parts in the case study. At first the current situation of the case company is studied. After that the empirical data linked with the relevant theory becomes an analysis of the current state. The analysis is then discussed by a comparison of the two different flows using the TPS-house to include the relevant factors of lean production. Finally the comparison is evaluated and the factors that have the greatest impact on the company's decision making are clarified. The result that the case study has generated is that the essential factors affect each other and that a business should focus on reviewing the factors together, to achieve a desired production flow efficiency. The reviewing of factors generates a support if outsourcing should be applied in a future corporate development. It also shows how the employees of the company are affected by this choice.

  • 332.
    Nilsson, Billy
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Karlsson, Erik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Utveckling och dimensionering av skridsko till vibrationsbalk för betonggjutning2017Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    I ett klimat av hög konkurrens måste företag ständigt arbeta med att utveckla och förbättra sina produkter för att kunna konkurrera på marknaden. Swepac är ett företag som är specialiserade på utveckling av betongbearbetande utrustning och huvudmålet med denna studie är skapa lönsamhet och utrymme för enklare tillverkning för en av deras produkter samtidigt som alla funktioner bibehålls. Den nuvarande produkten kostar mer att producera än vad försäljningspriset inbringar och produkten i fråga är en skridsko till en vibrationsbalk för betonggjutning. För att lyckas med detta utförs en produktutvecklingsprocess, hållfasthetsberäkningar och en kostnadsuppskattning.  I arbetet har kända och relevanta vetenskapliga metoder använts för att uppnå de satta målen. Resultatet presenteras i form av ett nyframtaget koncept med materialval och tillverkningsmetoder. En analys utfördes för att kunna dra slutsatser om det nyframtagna konceptets funktionalitet och lönsamhet.

  • 333.
    Nilsson, Per
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Suljkanovic, Salko
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Konstruktion av monteringsstation för tillverkning av ett aluminiumräcke2017Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
  • 334.
    Nilsson, Pontus
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Tordsson, Jan
    Improved lifetime of a rubber spring in an articulated hauler through product development2017Independent thesis Advanced level (degree of Master (One Year)), 40 credits / 60 HE creditsStudent thesis
    Abstract [en]

    Dampening systems are important in heavy vehicles utilized in rough terrains, with purpose to reduce shocks and vibrations with negative influences on the vehicle and, more importantly, on the operator of the vehicle. During the years the heavy vehicles require sturdier construction parts, due to demands on higher load capacity, where the easy solution to scale up the construction parts is not always applicable for dampening systems with nonlinear behavior. Hence, the sturdiness in the design of these dampening systems requires improvement. In this thesis the design of the rubber spring used as rubber spring in Volvo’s articulated hauler A40G is treated. The aim of this thesis is to find alternative design solutions on the rubber spring, improving its lifetime. The usual failure of these rubber springs is crack propagation in the rubber body. In the method of this thesis, alternative design solution are generated in concepts though brain storming, which are adjusted to achieve the desired behavior of the rubber spring through calculations and tested in performance through simulations in Abaqus. From analyzing the generated data, it is concluded that among the tested design solutions, a combination of fewer plates and shaping the plates as thin bowls, results in highest potential increase in lifetime.

  • 335.
    Nordborg, Tobias
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Lyrbo, Alexander
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Produktutveckling av skalkonstruktion för 3-axiellt styrt maskinstativ2016Independent thesis Basic level (professional degree), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    This thesis covers the product development of a multi-axial driven machine frame, which at a later stage will be intended to be used in additive manufacturing. The work that has been performed has led to concept development, material selection and manufacturing of a shell construction for a 3-axially driven machine construction. Tests and simulations have been done to verify if the machine design can be used by the specifications set by the host company. The construction was well within its tolerance of 100 microns at room temperature but showed some error margins at the operating temperature of 600 degrees Celsius. The results obtained have been analyzed in order to provide further suggestions for improvement of the structure when there still remain implications in ensuring the tolerances at operating temperature.

  • 336.
    Nylander, Rebecka
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    A model to cost-effectively improve the production flow by applying efficient maintenance: A case study2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Previous studies emphasize the importance of the company's competitive advantages and what is required to achieve them. What seems to be the basis for being able to compete is to constantly exceed customer expectations, which is achieved when companies are working on continuous improvement. This thesis aims to implant a model that contributes to continuous improvement by locating errors within the process, which can clarify where and what kind of maintenance is needed and thereby in a cost effective way improve the process, ensure quality and achieve customer requirements. The model is based on the PDCA model, which will consist of seven steps between P and D, in these seven steps a MFD matrix and Decision Matrix is also included. In order to increase the reliability of the model it has been tested on a case company, which provides basis for the result's outcome. The author's findings and conclusions show that the model fulfills its purpose, however, the model dependent on previous documentation and require some prior knowledge and time to implement.

  • 337.
    Nyström, Martin
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Tomaz, Tainan Pantano
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Fatigue analysis of welded joints in a forestry machine: Utilizing the notch stress concept 2015Independent thesis Advanced level (degree of Master (Two Years)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Welding is one of the most applied technics in the world for joining steel. Welds are liable to the phenomenon of fatigue, which is, primarily, the formation of a crack and consequently reduction of strength due to the action of time varying loads. Fatigue is one of the main causes of failure in steel structures. The aim of this thesis is to do static and dynamic analyses of a forestry crane with the purpose of using the analyses to determine the lifetime due to fatigue of welded components.

    Two methods for fatigue assessment are used in this work, the Hot-Spot Method and the Notch Stress Method. The first boom, which is a key component for the crane, is analyzed in a Finite Element Method (FEM) software. The found principal stress in accordance with the notch stress method in the first boom is ±165 MPa for the analyzed load case, rendering in a stress range of 330 MPa. The fatigue strength class FAT-225 (m=3), leads to an expected number of 633000 cycles, with a probability of survival of 97,7% for this case.

  • 338.
    Olofsson, Rasmus
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Dahl, August
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Effektivisering av flaskhals, en fallstudie på Gnutti Carlo2018Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    För att ett företag idag ska uppnå effektivitet krävs konkurrenskraftiga priser och hållbar produktion. Att detta ska vara möjligt krävs en tydlig målsättning och definierat nuläge för verksamheten. Processen eller momentet som har sämst flödesinverkan i tillverkningen kallas för flaskhals.

    Syftet med studien var att skapa förståelse hur arbetssätt kan effektiviseras i en flaskhalsprocess som kallas Chiron. För att uppnå målet som var att skapa förbättringsförslag baserade på interna faktorer för en flaskhalsprocess, studerade författarna olika teorier som sedan analyserades tillsammans med empiriska data. Genom analysen kunde författarna presentera en simulering till förbättringsförslag.

    Resultatet blev att tillgängligheten för maskinen kunde öka i och med simuleringen. Författarna utförde en kritisk analys på förbättringsförslagen där olika synpunkter på vidare aspekter diskuterades.

  • 339.
    Olsson, Jesper
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Ledtidsreducering ur ett värdeflödes-perspektiv2013Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    This case study is performed within the production of Sherwin-Williams, Bellö. The purpose is to increase the understanding how a value stream can function more efficient, from a lead time perspective. With the analytical model that is build up on known theories, the purpose have been fulfilled. Mapping of value and non value time for four products thru their respectively process reveals wastes, which is, waiting, transport and movement, incorrect processing and set-up time that in it self create transport and movement. Thru identified wastes that causes loss in lead time suggestions of improvement has been proposed. This to show solutions that can create a more effective flow with reduced non value time.

  • 340.
    Olsson, Jörgen
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering. SP Technical Research Institute of Sweden.
    Low Frequency Impact Sound in Timber Buildings: Simulations and Measurements2016Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    An increased share of construction with timber is one possible way of achieving more sustainable and energy-efficient life cycles of buildings. The main reason is that wood is a renewable material and buildings require a large amount of resources. Timber buildings taller than two storeys were prohibited in Europe until the 1990s due to fire regulations. In 1994, this prohibition was removed in Sweden.

        Some of the early multi-storey timber buildings were associated with more complaints due to impact sound than concrete buildings with the same measured impact sound class rating. Research in later years has shown that the frequency range used for rating has not been sufficiently low in order to include all the sound characteristics that are important for subjective perception of impact sound in light weight timber buildings. The AkuLite project showed that the frequency range has to be extended down to 20 Hz in order to give a good quality of the rating. This low frequency range of interest requires a need for knowledge of the sound field distribution, how to best measure the sound, how to predict the sound transmission levels and how to correlate numerical predictions with measurements.

        Here, the goal is to improve the knowledge and methodology concerning measurements and predictions of low frequency impact sound in light weight timber buildings. Impact sound fields are determined by grid measurements in rooms within timber buildings with different designs of their joist floors. The measurements are used to increase the understanding of impact sound and to benchmark different field measurement methods. By estimating transfer functions, from impact forces to vibrations and then sound pressures in receiving rooms, from vibrational test data, improved possibilities to correlate the experimental results to numerical simulations are achieved. A number of excitation devices are compared experimentally to evaluate different characteristics of the test data achieved. Further, comparisons between a timber based hybrid joist floor and a modern concrete floor are made using FE-models to evaluate how stiffness and surface mass parameters affect the impact sound transfer and the radiation.

        The measurements of sound fields show that light weight timber floors in small rooms tend to have their highest sound levels in the low frequency region, where the modes are well separated, and that the highest levels even can occur below the frequency of the first room mode of the air. In rooms with excitation from the floor above, the highest levels tend to occur at the floor levels and in the floor corners, if the excitation is made in the middle of the room above. Due to nonlinearities, the excitation levels may affect the transfer function in low frequencies which was shown in an experimental study. Surface mass and bending stiffness of floor systems are shown, by simulations, to be important for the amount of sound radiated.

        By applying a transfer function methodology, measuring the excitation forces as well as the responses, improvements of correlation analyses between measurements and simulations can be achieved

  • 341.
    Olsson, Jörgen
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering. RISE Research Institutes of Sweden, Sweden.
    Low Frequency Impact Sound in Timber Buildings: Transmission Measurements and Simulations2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    An increased share of multi-story buildings that have timber structures entails potential in terms of increased sustainability as well as human-friendly manufacturing and habitation. Timber buildings taller than two stories were prohibited in Europe until the 1990s due to fire regulations. In 1994, this prohibition was removed in Sweden. Thus, being a rather new sector, the multi-story timber building sector lags behind in maturity compared to the multi-story concrete sector. The low-frequency range down to 20 Hz has been shown to be important for the perception of the impact of sound in multi-story apartments with lightweight floors. This frequency range is lower than the one that has traditionally been measured according to standards and regulations. In small rooms, the measurement conditions tend to go from diffuse fields above 100 Hz to modal sound fields dominated by few resonances, below 100 Hz. These conditions lead to new challenges and to new possibilities for measurements and modelling.

    In the present research, a frequency response functions (FRFs) strategy aimed to simplify simulations and correlations between the simulations and test results was used. Measurements made indicate that, in the low frequencies, the highest sound pressures occur at the floor level opposite the ceiling / floor that is excited. By having an iterative measurement strategy with several microphones and making measurements until a required standard error is obtained, it is possible to gain a desired precision and information about the statistical distribution of both the sound fields and floor insulation performance. It was also found that, depending on the excitation source, the FRF from an excitation point on the floor above to the sound pressure at a microphone position in the room below may differ. This indicates that non-linearities in sound transmissions are present. Thus, the excitation source used in a test should be similar in force levels and characteristics to the real excitation stemming, for instance, from a human footfall, to achieve reliable measurement results. The ISO rubber ball is an excitation source that is close to fulfilling this need. In order to obtain an FRF, the impact force must be known. A rig that enables the impact force from a rubber ball to be measured was developed and manufactured. The results show that the force spectra are the same up to about 55 Hz, regardless of the point impedances of the floors excited in the tests. Similar results have been found by others in tests with human excitations. This means that FRFs up to about 55Hz can be achieved without actually measuring the excitation force.

    On the calculation side, finite element simulations based on FRFs may offer advantages. FRFs combined with the actual excitation force spectra of interest give the sound transmission. At higher frequencies, it is more important to extract the point mobilities of the floors and relate them to the excitation forces. By using an infinite shaft, sound transmission can be studied without involving reverberation time. The calculation methodology is used in the present research to evaluate different floor designs using FE models.

  • 342.
    Olsson, Jörgen
    et al.
    SP - Technical institute of Sweden.
    Jarnerö, Kirsi
    SP - Technical institute of Sweden.
    Linderholt, Andreas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Evaluation of AkuLite measurements of buildings: a comparison between sound pressure stemming from tapping machine and impact ball excitations2015In: Proceedings of the Forum Wood Building Nordic Conference 2015, Växjö, 2015Conference paper (Other academic)
    Abstract [en]

    The impact ball has shown to give excitations in close resemblance with the excitation from a human step. However due to practice and practical measurement reasons, it is interesting to use the tapping machine in low-frequency measurements. Here, the two excitation techniques; the tapping machine and the impact ball, are compared in terms of statistical dispersion. In the AkuLite project light weight apartment buildings were measured using a tapping machine and a (Japanese) impact ball in the low frequency range down to 20 Hz. The results showed that the tapping machine gives more narrow/better confidence interval in the test compared to the test using one excitation point together with the impact ball. The t-test of the consistency of the difference between the impact ball and tapping machine for the same measurement objects shows weak correlation, which implies that the results from the tapping machine are not normally possible to be interchanged with impact ball results and vice versa, without using a correction factor.

  • 343.
    Olsson, Jörgen
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering. RISE, Sweden.
    Linderholt, Andreas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Force to sound pressure frequency response measurements using a modified tapping machine on timber floor structures2019In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 196, article id 109343Article in journal (Refereed)
    Abstract [en]

    In recent years, research has shown that the lower frequency portion of impact sound, down to 20 Hz, is of significant importance to residents' perception in buildings that have lightweight timber floors. At low frequencies, the finite element method is a useful tool for predictive analysis. Impact sound frequency response functions, which are easily calculated using finite element software, are useful as they offer a common ground for studies of correlations between measurements and analyzes. On the measurement side, the tapping machine is well defined and has become the standard excitation device for building acoustics. When using a tapping machine, the excitation force spectrum generated - necessary to achieving experimental frequency force to sound response functions - is unknown. Different equipment may be used for excitation and force measurements and if a structure behaves linearly, the use of any excitation devices should result in the same frequency response functions. Here, an ISO tapping machine hammer is fitted with an accelerometer, enabling estimates of input force spectra. In combination with measurements of the sound in the receiver room, frequency response functions are then achieved using an ISO tapping machine. Various excitation devices have been used on a floor partition in a timber building and on a cross-laminated timber (CLT) lab. floor in order to compare the resulting frequency response functions. Structural nonlinearities are evident, implying that for accurate frequency response measurements in acoustically low frequencies, excitation magnitudes and characteristics that are similar to these which stem from human excitations, should preferably be used.

  • 344.
    Olsson, Jörgen
    et al.
    SP Technical Research Institute of Sweden, Sweden.
    Linderholt, Andreas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Low Frequency Force to Sound Pressure Transfer Function Measurements Using a Modified Tapping Machine on a Light Weight Wooden Joinst Floor2016In: Proceedings of WCTE, World Conference on timber Engineering, August 22-25, 2016, Vienna, Austria, Vienna: Vienna University of Technology , 2016Conference paper (Other academic)
    Abstract [en]

    In recent years research has shown that low frequency impact sound is of significant importance for inhabitants´ perception of impact sound in buildings with light weight wooden joist floors. The tapping machine is well defined as an excitation device and is a standard tool for building acoustics. However, the excitation force spectrum generated for each individual floor is unknown when using a tapping machine. In order to increase the possibilities to compare simulations to impact sound measurements, there is a need for improvement of impact sound measurement methods. By measuring the input force spectrum by a modified tapping machine and the sound in the receiver room, transfer functions can be achieved.In the light weight wooden building used for the evaluation test of the proposed method, structural nonlinearities are evident in the frequency response functions stemming from different excitation levels. This implies that for accurate FRF-measurements in low frequencies, excitation magnitudes that are similar to these stemming from human excitations should preferably be used.

  • 345.
    Olsson, Jörgen
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering. RISE Res Inst Sweden.
    Linderholt, Andreas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Low-frequency impact sound pressure fields in small rooms within lightweight timber buildings - suggestions for simplified measurement procedures2018In: Noise Control Engineering Journal, ISSN 0736-2501, E-ISSN 2168-8710, Vol. 66, no 4, p. 324-339Article in journal (Refereed)
    Abstract [en]

    Low-frequency impact sound insulation, down to 20 Hz, has a significant effect on humans' dissatisfaction due to noise in timber buildings. Today, the low-frequency procedure of the ISO 16283-2:2015 impact sound measurement standard covers the frequency range down to 50 Hz for the use of an ISO tapping machine, but does not yet cover the use of an ISO rubber ball. Here, microphone grid measurements were made in two small rooms that were excited by an ISO rubber ball from the rooms above. In each grid, 936 microphone positions were used to capture data representing the full spatial fields of impact sound pressures from 10 to 500 Hz for one excitation location for each room. The data show that the positions at the radiating ceiling surfaces have low maximum sound pressure levels compared to the pressure levels at the floors, especially in the floor corners. First, a measurement procedure to predict the maximum exposure of low-frequency sound in a room is proposed It is suggested that the maximum values for each frequency band in the corners opposite to the partition being excited (i.e., the floor corners) be used. Second, a procedure to predict the room average sound pressure level and the prediction's normal distribution is suggested. Iterative measurements with random microphone locations and random excitation locations are used. The advantage of this method is that the required precision and information about the sensitivity due to different excitation points are obtained. (c) 2018 Institute of Noise Control Engineering.

  • 346.
    Olsson, Jörgen
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering. Research Institutes of Sweden (RISE).
    Linderholt, Andreas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Measurements of low frequency impact sound transfer functions of light weight timber floors, utilizing the ISO rubber ball2018In: Proceedings of the 25th International Congress on Sound and Vibration, The International Institute of Acoustics and Vibration , 2018, p. 1-8Conference paper (Other academic)
    Abstract [en]

    Impact sound below 100 Hz is an important issue for light weight timber buildings. It is also well known that finite element model simulations are more beneficial in the low frequency range than in higher frequencies due to the longer wavelengths allowing the element meshes to be coarser. Utilizing transfer functions to describe impact sound would imply simplifications to correlate data stemming from measurements and low frequency finite element models. If the impact force is known, the simulations become easier since there would not be any need for the modelling of the impact mechanisms, just calculations of the transfer functions which are then combined with the force spectrum to give the resulting sound pressure. The impact ball has shown to be in close resemblance with a human's excitation in the low frequency range which makes it a suitable excitation device. However, when its force spectrum is needed, it may be hard in practice to achieve that during a regular measurement since the ball is not easily equipped with a force gauge. Here, two different methods are investigated. An investigation of the repeatability of the force spectrum of the rubber ball in the low frequency range for floors having different mobilities is made. To enable this, an equipment for field measurements of impact force spectrum and potentially point mobilities using an ISO ball, is designed, manufactured and evaluated. Impact force measurements are made on lightweight timber as well as concrete floors, with different properties for comparisons. Within the lowest frequencies it is potentially possible to use one given force spectrum from the ISO ball together with impact sound measurements for the creation of impact force to sound transfer functions on different floors.

    The full text will be freely available from 2020-08-03 10:06
  • 347.
    Olsson, Jörgen
    et al.
    SP Technical Research Institute of Sweden, Sweden.
    Linderholt, Andreas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Jarnerö, Kirsi
    SP Technical Research Institute of Sweden, Sweden.
    Low frequency sound pressure fields in small rooms in wooden buildings with dense and sparse joist floor spacings2015In: Proceedings of the Internoise 2015 conference: 44th International Congress and Exposition on Noise Control Engineering / [ed] Maling G.,Burroughs C., The Institute of Noise Control Engineering of the USA , 2015Conference paper (Refereed)
    Abstract [en]

    Using wood as the main construction material is a potential solution to achieve sustainable buildings. Previous research has shown that frequencies below 50 Hz are of significant importance for the perception of impact sound by residents living in multi-story buildings having light weight wooden frameworks. The standards used for impact sound measurements today are developed for diffuse fields above 50 Hz. For instance due to requirements concerning wall reflections, these methods are not applicable for low frequencies within small rooms. To improve measurement methods, it is important to know the nature of the full sound distribution in small rooms having wooden joist floors. Here, impact sound measurements with microphone arrays are made in two small office rooms having the same dimensions. The rooms represent two extremes in design of joist floors; one with closely spaced wood joists and the other with widely spaced joists. An impact ball is used for excitation the room being measured from the room above. The results show that there are significant variations in the sound pressure, especially in the vertical direction. Here, measurement techniques of impact sound in the low frequency range in small rooms in wooden buildings are evaluated and potential improvements are proposed.

  • 348.
    Olsson, Jörgen
    et al.
    SP Technical Research Institute.
    Linderholt, Andreas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Nilsson, Börje
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Impact evaluation of a thin hybrid wood based joist floor2016In: Proceedings of ISMA 2016, presented at the International Conference on Noise andVibration Engineering (ISMA) / [ed] Sas, P; Moens, D; VanDeWalle, A, Leuven, Belgium: Katholieke University Leuven , 2016, p. 589-602Conference paper (Refereed)
    Abstract [en]

    The purpose of this paper is twofold. The first aim is to develop a numericalanalysis procedure, by combining FRFs from FE-models with analyticalformulas for sound emission and transmission from the ceiling anddownwards within a room with four walls. The aim is to, by applying thisapproach; accomplish a tool which calculates the relative impact soundbetween different joist floors, in the low frequency range. The second aim is tobenchmark a thin hybrid wooden based joist floor with similar thickness,surface weight and global bending stiffness as a concrete hollow core floorstructure. What will be the difference in sound transmission? The question isrelevant since it may be necessary to make thinner wood based joist floors inhigh rise buildings, if wood should stay competitive against concrete. Theresults show that the direct transmissions of impact sound are very similararound the first bending mode. As the frequency increases, the modes in thestructures differ significantly. Below 100 Hz, the concrete floor has 4 modes,while the hybrid joist floor has 9 modes. As the frequency increases the soundradiation characteristics differs. The results show that it is possible to havesimilar sound transmission properties around the first bending modes for ahybrid based joist floor and a hollow core concrete floor structure with similar thicknesses. At the first modes of the structure, the information about thesurface weight and global bending stiffness are useful for prediction of soundtransmission properties but for higher modes, they are not sufficient.

  • 349.
    Olsson, Pär A. T.
    et al.
    Malmö University ; Lund University.
    Hyldgaard, Per
    Chalmers University of Technology.
    Schröder, Elsebeth
    Chalmers University of Technology.
    Jutemar, Elin Persson
    Tetra Pak.
    Andreasson, Eskil
    Tetra Pak ; Blekinge Institute of Technology.
    Kroon, Martin
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Ab initio investigation of monoclinic phase stability and martensitic transformation in crystalline polyethylene2018In: Physical Review Materials, E-ISSN 2475-9953, Vol. 2, no 7, article id 075602Article in journal (Refereed)
    Abstract [en]

    We study the phase stability and martensitic transformation of orthorhombic and monoclimic polyethylene by means of density functional theory using the nonempirical consistent-exchange vdW-DF-cx functional [Phys. Rev. B 89, 035412 (2014)]. The results show that the orthorhombic phase is the most stable of the two. Owing to the occurrence of soft librational phonon modes, the monoclimic phase is predicted not to be stable at zero pressure and temperature, but becomes stable when subjected to compressive transverse deformations that pin the chains and prevent them from wiggling freely. This theoretical characterization, or prediction, is consistent with the fact that the monoclimic phase is only observed experimentally when the material is subjected to mechanical loading. Also, the estimated threshold energy for the combination of lattice deformation associated with the T1 and T2 transformation paths (between the orthorhombic and monoclimic phases) and chain shuffling is found to be sufficiently low for thermally activated back transformations to occur. Thus, our prediction is that the crystalline part can transform back from the monoclimc to the orthorhombic phase upon unloading and/or annealing, which is consistent with experimental observations. Finally, we observe how a combination of such phase transformations can lead to a fold-plane reorientation from {110} to {100} type in a single orthorhombic crystal.

  • 350.
    Olsson, Pär A. T.
    et al.
    Malmö University;Lund University.
    in't Veld, Pieter J.
    BASF SE, Germany.
    Andreasson, Eskil
    Tetra Pak, Lund.
    Bergvall, Erik
    Tetra Pak, Lund;Blekinge Institute of Technology.
    Jutemar, Elin Persson
    Tetra Pak, Lund.
    Petersson, Viktor
    Tetra Pak, Lund.
    Rutledge, Gregory C.
    MIT, USA.
    Kroon, Martin
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    All-atomic and coarse-grained molecular dynamics investigation of deformation in semi-crystalline lamellar polyethylene2018In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 153, p. 305-316Article in journal (Refereed)
    Abstract [en]

    In the present work we have performed classical molecular dynamics modelling to investigate the effects of different types of force-fields on the stress-strain and yielding behaviours in semi-crystalline lamellar stacked linear polyethylene. To this end, specifically the all-atomic optimized potential for liquid simulations (OPLS-AA) and the coarse-grained united-atom (UA) force-fields are used to simulate the yielding and tensile behaviour for the lamellar separation mode. Despite that the considered samples and their topologies are identical for both approaches, the results show that they predict widely different stress-strain and yielding behaviours. For all UA simulations we obtain oscillating stress-strain curves accompanied by repetitive chain transport to the amorphous region, along with substantial chain slip and crystal reorientation. For the OPLS-AA modelling primarily cavitation formation is observed, with small amounts of chain slip to reorient the crystal such that the chains align in the tensile direction. This force-field dependence is rooted in the lack of explicit H-H and C-H repulsion in the UA approach, which gives rise to underestimated ideal critical resolved shear stress. The computed critical resolved shear stress for the OPLS-AA approach is in good agreement with density functional theory calculations and the yielding mechanisms resemble those of the lamellar separation mode. The disparate energy and shear stress barriers for chain slip of the different models can be interpreted as differently predicted intrinsic activation rates for the mechanism, which ultimately are responsible for the observed diverse responses of the two modelling approaches.

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