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  • 251.
    Landel, Pierre
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology. RISE - Research Institutes of Sweden, Sweden.
    Linderholt, Andreas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Johansson, Marie
    Linnaeus University, Faculty of Technology, Department of Building Technology. RISE - Research Institutes of Sweden, Sweden.
    Test-analyses comparisons of a stabilizing glulam truss for a tall building2019In: Book of abstracts: CompWood June 17-19, 2019, Växjö, Sweden: International Conference on Computational Methods in Wood Machanics - from Material Properties to Timber Structure, Linnaeus University , 2019Conference paper (Refereed)
  • 252.
    Landscheidt, Steffen
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Life Cycle Cost Analysis in the Swedish Automation Industry: A Case Study for developing a Total Cost of Ownership Model for Industrial Robots 2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Automation plays an important role when dealing with changes caused by globalization. The introduction of industrial robots is widely seen as an effective strategy against rising competition and outsourcing to low-cost countries. With the launch of amongst other the “Industrie 4.0” initiative, automation has been put into focus more than ever before and it is seen as the future way of production. Although the investment decisions for industrial robots are quite complex, the final purchasing decision is often only based on the initial offering. Procurement decisions based only the initial price are often poor decisions since they do not consider the hidden costs such as maintenance costs or energy consumption. A far better alternative is to calculate the total cost of ownership (TCO) of industrial robots and use this as the fundament in the decision making process. The TCO incorporates all costs from acquisition to the disposal of the industrial robot cell.

     

    The study develops, based on a TCO and total value of ownership (TVO) model for industrial robots, an operational template, which can be used in the sales process. By applying the case study research methodology, the model is developed based on a literature review as well as on expert knowledge from employees of Yaskawa Nordic AB (YNR). Qualitative and quantitate data is gathered at two customer companies and the most crucial factors are identified in order to create a simple, operational template. As most important factors, operators’ wages, spare parts and energy consumptions have been identified. However, while the development of a general model is accomplished in a satisfying way, the realization of the template is hindered due to too few available data. The study shows that many companies cannot control the costs, which are created by their automation equipment. This leads to the conclusion that with further implementation of tools for “Industrie 4.0” the model and template can be revised allowing far more precise TCO/TVO calculations.

  • 253.
    Landscheidt, Steffen
    et al.
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Kans, Mirka
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Automation Practices in Wood Product Industries: Lessons learned, current Practices and Future Perspectives2016In: The 7th Swedish Production Symposium SPS, 25-27 October, 2016, Lund, Sweden, Lund, Sweden: Lund University , 2016, , p. 9article id E1Conference paper (Refereed)
    Abstract [en]

    Wood product industries are a cornerstone of the Swedish industry and contribute vastly to the total Swedish export value. Wood as material itself has a promising perspective of becoming one of the most valuable resources. Sweden in particular has a long tradition and the knowledge of how to cultivate forests. In comparison to the highly automated forest industries, production systems of Swedish wood products industries are mostly characterized by a low degree of automation, tough manual labour and a relative low competency of the workforce. Facing fiercer competition on a global market, Swedish wood product industries are starting to lose touch with wood working industries in other industrialized European countries. Based upon established literature, this paper systematizes the status of automation practices in wood processing industries. The outcome of this study also outlines the expected effects and the future perspectives of digitalization and robotic automation for wood processing industries in high-1are not ready to implement the necessary standards to enter Industry 4.0. Not only are the technical prerequisites not fulfilled, but also a lack of appropriate production organization, logistics and economic basis is affecting negatively.

  • 254.
    Landscheidt, Steffen
    et al.
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Kans, Mirka
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Method for Assessing the Total Cost of Ownership of Industrial Robots2016In: 49th CIRP Conference on Manufacturing Systems, CIRP-CMS 2016, Commundo Tagungs Hotel Stuttgar,; Germany, 25 May 2016 through 27 May 2016 / [ed] Bauernhansl T.,Westkamper E., Elsevier, 2016, Vol. 57, p. 746-751Conference paper (Refereed)
    Abstract [en]

    With the launch of Industry 4.0, automation has increasingly been put into focus as one of the key factors for future production. The introduction of industrial robots is widely seen as an effective strategy against rising competition and outsourcing to low-cost countries. The investment into industrial robot cells is often based on the initial offering and its pay-off time. However, procurement decisions based only on the initial price are often poor decisions since they do not consider hidden cost factors such as maintenance or energy consumption. Evaluating the total cost of ownership (TCO) of industrial robots is a far better alternative to calculate all costs involved during their company ownership. Thus far, only a few models concerning TCO or similar cost analysis techniques for industrial robots have been published and empirical studies of the economic aspects of robotic implementation are scarce. The key contribution of this paper is the development of a conceptual model for TCO calculation of industrial robots, which can be used during the decision making process. The developed model was tested in two case studies, one for material handling robots and one for arc welding. The goal was to identify the most crucial factors allowing an easily estimated calculation of the TCO based on the net present value. As most contributing factors, operators’ wages, spare parts and energy consumption are identified. However, this paper also shows that retrieving necessary data from companies turned out to be complicated, because of the low awareness of these companies’ expenditures for the costs generated by their automation equipment. In accordance with the results, both, a simple template was created in order to support the people involved in the decision making process with additional investment information and crucial factors are pointed out for measuring and evaluation in of future digitalized robot systems.

  • 255.
    Landscheidt, Steffen
    et al.
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Kans, Mirka
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Winroth, Mats
    Chalmers University of Technology.
    Differences on automation practices in wooden single-family houses manufacturing: Four case studies2017In: 23rd International Wood Machining Seminar Proceedings / [ed] Marcin Zbiec and Kazimierz Orlowski, Warsaw, Poland: Warsaw University of Life Sciences , 2017, p. 350-359Conference paper (Refereed)
    Abstract [en]

    In densely forested countries, forest and wood-based products are an important contributing factor to the country’s economy and also a valuable resource for house manufacturing. With rising demand for housing in Europe, wooden houses have become more of an alternative to concrete houses. Although wooden houses have always been popular in Nordic countries, higher demand puts more pressure on seemingly outdated production facilities and personnel in order to supply the market. Whereas many other industries strive to modern production concepts such as Industry 4.0 to adapt to new market conditions, industrial timber house building is still characterized by a high amount of manual labor.

    In Europe´s highly industrialized countries, labor costs influence wooden house manufacturers rather negatively and exert great pressure on them to stay competitive. Some companies have chosen outsourcing of their operations and production as means to survive. Another way, already successfully proven in other industries, is the automation and digitalization of production processes. Effective implementation of automation equipment depends on several factors, e.g. production volume, applied material, chosen application or cycle times. It is not entirely clear which factors are contributing to the successful change to a more automated production.

    Based on an Industry 4.0 readiness model, the purpose of this study is to seek out which dimensions correlate with each other in order to support improved production processes and efficiency for wooden single-house manufactures. 

    By applying a comparative case study approach, automation standards and practices in Sweden, Germany and Austria, are described and compared. Results of this case study reveal that a production strategy together with sound digital support and information sharing leads to the best production systems for single-wooden houses manufacturers.

  • 256.
    Landscheidt, Steffen
    et al.
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Kans, Mirka
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Winroth, Mats
    Chalmers University of Technology.
    Opportunities for robotic automation in wood product industries: The supplier and system integrators' perspective2017In: 27th International Conference on Flexible Automation and Intelligent Manufacturing, FAIM2017 / [ed] Pellicciari, M; Peruzzini, M, Elsevier, 2017, p. 233-240Conference paper (Refereed)
    Abstract [en]

    In this study, the opportunities for automation in the poorly automated wood product industry are highlighted. This isaccomplished by conducting a qualitative interview study of suppliers and system integrators for industrial robots active in thisparticular industry sector. Five case companies are chosen in order to explore the unique dimensions responsible for successfulautomation implantation in wood product companies. Results show that a low understanding of automation opportunities, unclearrequirements specifications, and small production volumes are the main problems for suitable automation solutions. Althoughwood is a fragile and changeable material, existing technology allows its manipulation with industrial robots.

  • 257.
    Landscheidt, Steffen
    et al.
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Kans, Mirka
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Winroth, Mats
    Chalmers University of Technology.
    Wester, Hans
    Yaskawa Nordic AB.
    The future of industrial robot business: Product or performance based?2018In: Proceedings of the 8th Swedish Production Symposium (SPS 2018) / [ed] Mauro Onori, Lihui Wang, Xi Vincent Wang, Wei Ji, Elsevier, 2018, Vol. 25, p. 495-502Conference paper (Refereed)
    Abstract [en]

    The robot market today is mainly based on product-centered sales concepts. In the future, traditional procurement of industrial robots can be expected to become less important and the business models will shift the focus towards leasing or even pay-per-use. This paper discusses how these new business models should be designed and what components and features are needed for successful implementation. Digitalization, circular economy, cultural barriers, business traditions and fear of new philosophies are investigated and put into the context of the advantages offered. A possible transformation process is set into the context of the product-process matrix.

  • 258.
    Larsson, Anna
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Adamowicz, Anna
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Effektivisering av en monteringsprocess  : En fallstudie2015Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [sv]

    Studien genomfördes på Hydroware Technology AB med syftet att få ökad förståelse för monteringsprocessen i ett industriellt tillverkande företag, för att kunna visualisera helheten av processen samt kunna synliggöra icke värdeskapande aktiviteter.

    För att kunna uppnå syftet och besvara studiens undersökningsfråga gjordes en nulägesanalys för hela produktionen samt en fokuserad analys av den valda delprocessen. Vidare utfördes ett antal experiment för att undersöka hur olika variabler kunde påverka förbättringsarbetet. Resultatet av studien diskuterades och mynnade ut i ett antal rekommendationer, som fallföretaget kunde ha användning av i sitt effektiviseringsarbete.

    I de sista kapitlen redogjordes förslag för hur företaget skulle kunna förbättra sitt arbetssätt och bidra till en hållbar utveckling. Det finns fler förbättringsmöjligheter på fallföretaget och forskarna rekommenderar vidare studier för att effektivisera fler delprocesser och uppnå det önskade framtida tillståndet.

  • 259.
    Larsson, Peter
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Lange, Dorian
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Kostnadseffektivisering av en produktionsprocess i SMF: -En fallstudie2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Fallstudiens syfte är att skapa en förståelse för hur man kan identifiera ekonomiska förluster samt förbättra det interna produktionsflödet med rekommenderade förbättringsåtgärder. Målsättningen är att skapa en modell som kan hjälpa SMF att förbättra sin produktion. Modellen ska sen testas empiriskt i fallföretaget och tillsammans med den noggrant utvalda teorin generera en nulägesanalys som ska sammanställa faktorer som är väsentliga att studera för att förbättra produktionen.

    Nyckelord:

    Produktionsflöde, Kartläggning, Modellutveckling, Lean produktion, Produktionsutveckling, SMF

  • 260.
    Levin, Erik
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Andersson, Daniel
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Utveckling av bakluckan på Volvos ramstyrda dumper2019Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Målet med detta arbete var från början att ta fram 2-3 olika koncept som hindrar dumperns baklucka från att studsa och skapa onödigt buller. En produktutvecklingsprocess anpassades för projektet och användes för att systematiskt genomföra arbetet. Under arbetets gång gjordes valet att uppdatera målet till att ta fram en fullskalig prototyp och testa denna på en dumper. Resultatet blev en robust och ekonomisk produkt som hindrar bakluckan från att studsa och sänker dumperns bullernivå avsevärt.

  • 261.
    Li, Junqiu
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Physical and Mechanical Properties of Medite® MDF Exterior from Acetylated Wood Fibers2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Currently, the demand for wood-based panels has been growing solidly in European countries. Medium density fibreboard (MDF) manifests the potentialities for outstanding physical and mechanical properties. However, MDF from different fiber sources is normally designed for internal applications due to the poor moisture resistant capability. This study was conducted on acetylated MDF (Medite® MDF Exterior) to evaluate how physical (i.e. density, moisture content, dimensional stability, thickness swelling) and mechanical (i.e. modulus of elasticity, internal bonding strength before and after accelerated aging, bending stiffness and bending strength) properties behave at different relative humidity (i.e. 35 %, 65 % and 85 % RH at constant temperature of 20 ℃) levels. Bending stiffness was measured non-destructively by means of resonance method. The material used for control samples was commercial MDF. The size, quantity, conditioning and test method were followed in accordance with respective standards. The results showed that physical and mechanical properties were less influenced by Medite® MDF Exterior compared to commercial MDF. Medite® MDF Exterior were superior to commercial MDF in moisture resistance. Medite® MDF Exterior had more stable mechanical properties than commercial MDF with the changes of relative humidity.

  • 262.
    Lij, Mattias
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    En modell för att kostnadseffektivt öka produktionen inom aluminium-bearbetning2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this study is from a case study develop a model that aims to cost effectively improve productivity in a manufacturing production process. The study highlights the importance of having knowledge about customer needs and using a holistic process perspective when improving productivity to identify the relations between the process stations and by this find problems that cause waste and losses in productivity. Tools and methods used to make production more efficient such as single minute exchange of die, spaghetti diagram, 5s and master production schedule is presented an applied in the model to see how these effect costs, productivity etc.

    Maintenance effects on quality and productivity in a manufacturing company will as well be covered in this thesis. The results and conclusions finally reveals how the process improvement tools, maintenance and production planning for example effects each other and why it is important to establish an attitude in the company where continuous process improvement should be emphasized.

  • 263.
    Lindblad, Fredrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    A Case Study of Växjö Municipality’s Actions to Increase the Construction of Wooden Multi-Family Buildings2018In: 7th Forum Wood Building Nordic - Växjö 2018, 2018Conference paper (Other academic)
    Abstract [en]

    In 2005, a national wood-building strategy was adopted with the aim that 30 % of all new buildings within 10-15 years should use a wood-frame and that the number of buildings out of wood increase by 30% within a five-year period (Ds 2004:1). Despite this, less than 10 % of the multi-family houses are currently being built in wood, and the building developments in Sweden continue to show an upward trend for using concrete in building solutions for multi-family houses (Sveriges Träbyggnadskansli 2017; Svensk Betong 2016). However, several municipalities in Sweden chose to develop against this prevailing trend, Växjö municipality being one of them. Hence, Växjö municipality have since the implementation of the national wood-building strategy focused on using wood in new building projects. Therefore, Växjö municipality already in 2015 reached the municipal objective where 25 % of the construction directly controlled by the municipality would be wood-based. There is currently a change under way within public governance, from 'government to governance', which usually represents a shift from central governance to interactive governance because of a shift from public sector control to the private sector control (Montin & Hedlund 2009). In practice, this means that much of the power and control of municipalities has been transferred to private or other social actors Vall (2007). The planning for the construction of buildings has changed historically. Today, this is largely based on market actors fulfilling the requirement, and municipalities are expected to develop controlling instruments in line with the goals mentioned in the environmental policy and housing policy (Boverket, 2016). The municipality is expected to meet the public interest in housing and contribute to achieving Sweden's environmental and climate objectives, while at the same time the government are attempting to influence municipalities through the planning and environmental legislation that regulates construction.

  • 264.
    Lindblad, Fredrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    A review of Växjö Municipality’s operational and strategic development constraints related to the construction of wooden multi-family houses2019In: Journal of Civil Engineering and Architecture, ISSN 1934-7359, E-ISSN 1934-7367Article in journal (Refereed)
    Abstract [en]

    Sweden has a housing shortage, which the Swedish authorities expect to continue until 2025. Producers of wooden multi-family houses have a relatively small market share in comparison to traditional building materials. The limited capability to fulfil the increased building demand also restricts the possibilities for development towards innovation, bio-economy and sustainability. The municipalities in Sweden have responsible for planning of the building development in their region based on their projected requirements and strategies. Combining this with a desire to develop sustainable building solutions based on wood increases the complexity. Currently, public building developments are achieved through the public procurement act or the land allocation activity, dependent on their development strategy. This normally involves the development of local strategies regarding, e.g. design, material choice and geographical development. By identifying market drivers enables improved market entry activities related to public building initiatives using wood-based solutions. Hence, by improving transparency in the land allocation activity generate enhanced possibilities for the companies to respond successfully to the requests submitted by the municipalities. This knowledge is used to better understand the required strategic development for the companies, the government and the municipalities to increase the use of sustainable building materials in Swedish multi-family housing projects.

  • 265.
    Lindblad, Fredrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Barriers in the Public Procurement Process: Restricting Long-Term Sustainable Construction of Wooden Buildings2019In: Scandinavian Journal of Public Administration, ISSN 2001-7405, E-ISSN 2001-7413, Vol. 23, no 2, p. 13-32Article in journal (Refereed)
    Abstract [en]

    The municipalities control the planning of new housing projects in Sweden, basing their decisions on the general requirements and future strategic expectations. The activity is managed through the Public Procurement Act or the land allocation process depending on their development strategy. It involves the development of local strategies regarding design and geographical development, as well as the development of suitable procurement methods. Therefore, having the ambition to develop sustainability by increasing the use of wood building solutions imposes new challenges on the procurement process performed by municipalities in Sweden. The aim of this study is to identify ways to overcome barriers in the public procurement process for new building developments based on land allocation projects managed by Swedish municipalities, enabling an increase in wooden multifamily houses in Sweden. The study is based on direct participation at a municipality performing this activity, combined with interviews including municipalities and developers involved in the procurement process using land allocation. The result shows discrepancies in how the municipalities and developers perceive the land allocation activities. Furthermore, national standards, equal evaluation methods and a defined procurement process have been identified as drivers towards an efficient activity, which currently acts as a barrier to the development of wooden multifamily houses.

  • 266.
    Lindblad, Fredrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Flourishing region thanks to oil and gas2007In: International Transport Journal – Middle East and Africa Special, Vol. 7-8Article in journal (Other (popular science, discussion, etc.))
  • 267.
    Lindblad, Fredrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Identifying drivers and barriers for market growth within the industry producing wooden multi-family houses: Land allocation process for future growth2019Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    At present, Sweden is experiencing a housing shortage, which Swedish authorities expect to continue until at least 2025. Producers of wooden multi-family houses have a relatively small market share compared to those who use traditional building materials. Limited ability to meet the increased building demand restricts possibilities for development regarding innovation, bio-economy and sustainability.

     

    Swedish municipalities are responsible for planning the building development in their regions based on their projected requirements and strategies. Combining this with a desire to develop sustainable building solutions based on wood increases complexity in the public procurement process. Currently, public building developments are achieved through the Public Procurement Act or land-allocation activity, depending on the development strategy. This normally involves developing local strategies regarding, e.g. design, material choice and geographical development. Identifying drivers and barriers in the industry and market enables improved market entry activities related to public building initiatives using wood-based solutions. Hence, improving transparency in land-allocation activity generates possibilities for companies to respond successfully to requests from municipalities. This knowledge is used to better understand the required strategic development for companies, the government and municipalities to increase use of sustainable building materials such as wood in Swedish multi-family housing projects.

     

    Results show that the industry experiences barriers associated with municipalities' actions and knowledge related to wood as a building solution. Further, concrete’s strength as a building material is an issue, since municipalities tend to opt for familiar solutions. Furthermore, the way in which municipalities manage land-allocation activity is perceived as insufficient, with limited information, a subjective evaluation process, and uncertainties regarding their roles in the process. These factors contribute to ambiguity and sub-optimisation for developers proposing wood-based building solutions.

  • 268.
    Lindblad, Fredrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Living quality in wooden multi-family houses2019In: Pro Ligno, ISSN 1841-4737, E-ISSN 2069-7430, Vol. 15, no 4, p. 434-441Article in journal (Refereed)
    Abstract [en]

    There is an increased demand for multi-family houses in Sweden, which makes it important to investigate what the residents consider to be building quality in relation to their living situation and what they prioritise when selecting an apartment. Having the ability to build good housing units is an essential part of society since it directly affects people's living standard and way of life. Consequently, understanding living quality creates possibilities to adjust the construction and design of housing units accordingly. Currently, more multi-family houses are being built with wooden frames than ever before, and it is therefore interesting to compare if there is a difference in how residents experience the quality of living in a multi-family house with wooden frames compared with concrete frames. 

    The purpose is to show what residents consider to be living quality and if there is any quality difference in housing units using wood or concrete as construction material in the building frame. A survey has been sent out to a selected amount of multi-family houses in Sweden, Thereby, gain an understanding of the perceived quality of new building developments, which showed that the quality of living did not differ between the selected materials and the location in the city was the most important parameter when choosing accommodation for the residents. 

  • 269.
    Lindblad, Fredrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Market development barriers for the Swedish wooden multi-family house industry2019In: International Journal of Engineering and Technology, ISSN 1793-8236, E-ISSN 1793-8244, Vol. 11, no 3, p. 187-195Article in journal (Refereed)
    Abstract [en]

    The Swedish industry for wooden multi-family houses have in comparison with houses in concrete had a relatively small market share. This contradicts EU’s ambitions defined in the Europe 2020 strategy, focusing on development towards innovation, bio-economy and sustainability. These strategies highlight the importance of developing the wooden multi-family houses industry to fulfil the increased market demand combined with increased sustainability in the building industry.This study aims to identify barriers enabling market growth for the Swedish industry producing wooden multi-family houses. Current barriers within the industry are reviewed by identifying areas restricting the development, e.g. the building process and procurement cycle. Thus, the goal is to find ways in which wooden multi-family houses could improve competitiveness compared to established solutions and increase its market share. The study was conducted with representatives from municipalities, developers, contractors, architects and real estate companies providing insights on new strategic possibilities in the building process.The result identifies different barriers that exist in various stages of the value chain, from procurement to construction. Furthermore, it indicates that wooden multi-family houses could be a competitive solution by developing new strategies, mitigating the identified market barriers facilitating growth towards sustainable building solutions. These instructions give you basic guidelines for preparing camera-ready papers.

  • 270.
    Lindblad, Fredrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Market structure and economic status for firms producing single-family houses in Sweden2016Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The gradually changing behavior of the population, towards urbanization, ledto an increased shortage of available housing. This development has resultedin a serious issue in Sweden, where too few firms are providing solutions formulti-family houses in wood. Potential firms that could fill this increasingdemand are those in the single-family house industry. Yet, these firms mightface considerable problems with productivity, predominately derived fromincreasing production costs and inadequate production development.Developing these firms are associated with long-term investments, whichis investigated by evaluating the industry structure for sellers, highlightingthe financial and market situation within their industry. These factors aregrowing in importance due to the current market concentration, where morefirms are required to focus on product development driven by the demand toprefabricate wooden elements, volumes or modules in an industrialized way.This thesis studies Swedish firms producing wooden single-familyhouses, with the aim to investigate their possibilities to enter the woodenmulti-family house industry in Sweden.Investigations will be conducted by applying Altman’s Z’ value, riskposition model, the Herfindahl-Hirschman index, the Herfindahl-Hirschmannumber equivalent, productivity ratio model for profitability and finally amodel measuring market Concentration Ratio.Results show that the industry tends towards perfect competition with toomany firms involved, i.e. firms mainly have to compete by prices. Further,firms are grouped into three zones; risk, grey or safe zone. The levels withinthese zone show a reduction of firms in the red zone over time. Related to thecurrent risks, many firms have promising positions to invest in productdevelopment towards wooden multi-family houses, in addition to theircurrent products, even though firm productivity has declined during thestudied time frame. The results that the investigated firms have goodpossibilities gaining a competitive advantage by diversifying into thegrowing wooden multi-family house industry.

  • 271.
    Lindblad, Fredrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Next big thing in 3PL: The role of 3PL to diversify and progress up the value chain2007In: Gulf Log, Vol. 7Article in journal (Other (popular science, discussion, etc.))
  • 272.
    Lindblad, Fredrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Structural development of the tender based land allocation process enables an improved public building development activity2019In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280Article in journal (Refereed)
    Abstract [en]

    Detailed planning for housing development is the responsibility of the respective municipalities in Sweden. Further, an ambition to develop sustainable building solutions based on wood is combined with each municipality’s building requirements, which increases complexity in the public process. Public actions leading to increased construction of wooden multi-family houses are important for all actors in this process, which is managed by municipalities through the Public Procurement Act or the land allocation process, depending on their development plan and strategy.

    The aim is to shed light on how the land allocation process is currently performed, to improve efficiency and provide transparency and structure between developers and municipalities. The study uses the public procurement process as a conceptual model to structure the various activities in the land allocation process based on the similarities between the two processes. Thereafter, it is applied to the tender-based land allocation process to provide a transparent process for municipalities to follow.

    The results display discrepancies in perception of the land allocation process and the level of competence displayed by municipalities when managing this process. This hinders the development of wooden multi-family houses in Sweden.

  • 273.
    Lindblad, Fredrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Summary of research result from the “City development project Torparängen”2019Report (Other academic)
  • 274.
    Lindblad, Fredrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    The building process: a boundless multidisciplinary research project related to wooden multi-family houses in Sweden2019In: Pro Ligno, ISSN 1841-4737, E-ISSN 2069-7430, Vol. 15, no 4, p. 329-336Article in journal (Refereed)
    Abstract [en]

    The wood-building industry of multi-family houses is increasing its market share in Sweden, yet the research and education are not incorporating a total building process perspective. Typically, research is conducted in individual areas without having an overall coordinated perspective, which increases the risk of sub-optimisation. In a unique project in Sweden, several components in the building process have been studied within one project; “City development project Torparängen”. The purpose was to gain a broader understanding of what influence the development of wooden multi-family houses, combining the effect from technological and non-technological advancements, which intended to support the development of a new wood building strategy. 

    By reviewing several areas within the building process provided information related to how market strategies, procurement methodologies, leadership and project management, equally influence the development as the more traditional fields in the industry, i.e. material handling, lean production, logistics and production improvement. Further, having the possibility to capture end-user preferences in this process provides opportunities to develop a more agile building process, adjusting market and production activities accordingly. The study was conducted during two years and involved approximately 250 respondents in different roles, and active in the building process within companies and governmental organisations across Sweden. 

  • 275.
    Lindblad, Fredrik
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Thriving demand for value-added logistics services - Manufacturers increasingly outsourcing packaging, customisation and assembly-type services to professional 3PL companies2007In: Gulf Log, Vol. 4Article in journal (Other (popular science, discussion, etc.))
  • 276.
    Lindblad, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Bolmsvik, Åsa
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Pettersson, Jenny
    Wiberg, Sara
    Efficiencies in the On-Site Material Handling Process by Using Radio Frequency Identification in the Wood Building Construction Industry2018In: International Journal of Innovation, Management and Technology, ISSN 2010-0248, Vol. 9, no 6, p. 252-259Article in journal (Refereed)
    Abstract [en]

    In the past decades, the housing shortage in Sweden accumulated to a level that led to problems finding accommodation for many people, which created opportunities for the market producing multi-family houses. The market is dominated by concrete solutions whereas solutions using wood as a building material only comprise 9 % of the market. This market is highly competitive with many companies offering relatively similar products or services. One way to develop new business opportunities is to enhance other competence besides production technology that currently acts as a market development barrier. Hence, the material handling process at building sites is seen as a barrier that can contribute improving competitiveness.

    There are currently problems with material handling at many building sites of wood-building solutions in Sweden, materials arrive at the wrong time, waste of storage space, unnecessary tracking of materials or wrong quantities arriving at the sites. The purpose of the study is to investigate if Radio Frequency Identification (RFID) is a technology that can be used to achieve an efficient material handling process and if the wood building industry in Sweden is willing to implement the technology. Thus, investigate if material handling using RFID can improve time effectiveness, minimise waste and monitor moisture levels in the material efficiently, creating improved competitiveness. The study shows that the use of RFID improves time efficiency and control the material handling, indicating that RFID has potential to improve this process. Further, the study identifies possibilities by using RFID technology to minimize damages and control moisture levels.

  • 277.
    Lindblad, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Flinkman, Matti
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Schauerte, Tobias
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Assessing corporate economic distress: a study of the wood construction industry2017In: Pro Ligno, ISSN 1841-4737, E-ISSN 2069-7430, Vol. 13, no 4, p. 594-601Article in journal (Refereed)
    Abstract [en]

    Wood buildings are considered as a viable option to support the effort minimizing the current housing shortage in Sweden. Companies trying to develop into this industry are needed to increase the use of prefabricated wooden elements, volumes or modules in an industrialized way. Suitable companies to make this development could be found amongst firms producing wooden single-family houses. These companies currently act on a highly competitive market with many companies offering relatively homogeneous products or services. Therefore, differentiation towards the wooden multi-family house industry could be considered as a long-term strategy, minimizing the economic distress and improving the survival of the company.The study is aiming at describing the development of economic distress and market concentration ratio in the Swedish industry for wooden single-family houses, for an eleven-year period from 2005 to 2015. The companies could be helped to understand, if and how the market concentration ratio and the economic distress are connected, linking company size to economic stability and efficient resource utilization. This will be conducted by applying Altman’s Z’-score model, grouping firms into a risk, a grey or a safe zone, combined with calculating the industry structure by means of the concentration ratio model. The required data were collected from the annual reports of the 51 relevant firms in the industry.

  • 278.
    Lindblad, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Lehman, Karolina
    Aggerstam, Elina
    A comparative study of the environmental impact from transportation of prefabricated building elements using wood or concrete2019In: International Journal of Engineering and Technology, ISSN 1793-8236, E-ISSN 1793-8244, Vol. 11, no 3, p. 154-161Article in journal (Refereed)
    Abstract [en]

    As many as 240 of Sweden's 290 municipalities estimated that there existed a housing shortage within their region. Therefore, many homes are required to be built in a relatively short period to fulfil the demand.  Production is required to take into consideration sustainable building solutions to reduce climate impact. Hence, logistics must become more efficient to contribute to an environmental solution, and the use of transports should be examined reducing the effect of heavy vehicles to meet the climate objectives.

    The focus of this study is to identify differences between the transportation of materials for building projects based on wood or concrete. Different key performance indicators were derived from the collected data and presented in this study, which resulted in two formulas focusing on transport- and environmental impact. 

    The KPI’s indicates that the weight of the load does not have an important impact on the amount of emitted CO2, but it is the number of transports associated with the projects that are the main problem regarding emissions and environmental impact. Hence, the number of transports and the amount of CO2 emissions can be calculated by the support of the formulas derived from this study.

  • 279.
    Lindblad, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Magnusson, Bengt
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Luu, Alan
    Ragnarsson, John
    Information Flow Optimisation: Enabling Standardisation towards Modular Building Methods of Wood-Building Solutions2018In: International Journal of Innovation, Management and Technology, ISSN 2010-0248, Vol. 9, no 6, p. 232-239Article in journal (Refereed)
    Abstract [en]

    Currently, there is a considerable lack of residential buildings in Sweden. Hence, companies that are active in the housing industry producing wood-building solutions have been affected by high demand for their products. The industry tries to be more effective, and one means of achieving this goal is to automate the production, similar to the automotive industry. However, improvements in the information flow have not come as far as developments in the production. Therefore, it is necessary to streamline the entire process and reduce the amount of manual work using rationalisation and automation to enhance competitiveness. This is not only applicable to the actual manufacturing process but also in a large degree to the design process, i.e. the transition from the basic to the detail design stage. The purpose of this research is to compare the information flow for various building projects before production, identifying development possibilities by using an improved information process.

    Information has been collected into a status report using interviews, surveys and from data in the Enterprise Resource Planning (ERP) system.

    Two areas were identified out of the status report: standard projects and special projects. The special projects constitute 90 % of the project departments actual workload, whereas standard projects do not exceed the projected lead times creating less problem than special projects. Therefore, the long-term development strategy for the industry should be to improve the level of project standardisation, developing an advanced modular system based on improved information flow minimising the need for special projects.

  • 280.
    Lindblad, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Schauerte, Tobias
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Identifying drivers facilitating product development within the industry for wooden multi-family houses2017In: Pro Ligno, ISSN 1841-4737, E-ISSN 2069-7430, Vol. 13, no 4, p. 602-609Article in journal (Refereed)
    Abstract [en]

    Sweden is forecasted to grow its population with 1.1 million people over the next eight-year period, increasing the demand on the construction phase of housing units throughout Sweden. However, at present, 240 of Sweden's 290 municipalities show an existing deficit of available housing units in their regions, resulting in inherent difficulties fulfilling this demand utilizing the current production structure. Therefore, further utilizing wood as a building material could contribute to minimize the gap, as well as fulfilling the EU’s goals towards the Europe 2020 strategy and the EU forest strategies, focusing on development towards innovation, bio-economy, sustainable sourcing and use of raw materials. This study is aiming to identify drivers supporting the Swedish industry of wooden multi-family houses to enable market growth through competitive and sustainable strategies. The representatives within the building process identify drivers, how they perceive their effect on the companies’ abilities to develop based on long-term and short-term strategic impact. Thus, the goal is to find ways in which wooden multi-family houses could compete as a building solution, compared to established solutions, thereby increasing the market share in Sweden. The methods used in this study is surveys distributed to representatives from municipalities, developers, contractors, architects and real estate companies.The result identifies three change drivers influencing the industry development for wooden multi-family houses in Sweden: technological-, knowledge- and environmental- drivers. These drivers have an effect on the companies’ ability for successful new product development and for development of sustainable strategies towards market growth for wooden multi-family houses.

  • 281.
    Lindblad, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Schauerte, Tobias
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Operational and Financial Risks in the Swedish Industry for Wooden Single-Family Houses: A Trend Analysis2015In: 4th Forum Wood Building Nordic Växjö 2015, 2015Conference paper (Other academic)
    Abstract [en]

    Shifting concentration of population to urban areas has increased the shortage of available housing. The combination of housing shortage with a limited number of companies that provide solutions for multi-family houses in wood has become a serious concern in Sweden. Those companies that possibly could fill this void and enter this segment are at present time producing single-family houses. The development for these companies is connected to investments in long-term product development. The aim of this paper is to examine the possibility for these companies to develop and enter this segment. This is investigated by describing the risk position and financial situation for the companies within this industry, over time. It is conducted by utilizing a risk position model for 46 selected companies, comparing the development trend over a selected time period. This has exposed that many of the companies have demonstrated a positive financial situation and risk position over time, indicating a favorable position to invest in product development towards wooden multi-family houses in addition to their current products.

  • 282.
    Lindblad, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Schauerte, Tobias
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    The perceived end-user satisfaction of sound transmission and their willingness to pay for value creation2015In: Internoise, 9-12 August, 2015, San Francisco, Society of Experimental Mechanics (SEM) , 2015Conference paper (Other academic)
    Abstract [en]

    From a consumer perspective, living quality in the building itself is vital, e.g. as perceived sound transmissions between apartments could differ significantly for the inhabitants and thus, affects consumer satisfaction differently. This is important for the contractor when using wood as building material, in combination with developing cost efficient and profitable building solutions. The aim of this study is to investigate if end-users in lightweight and heavyweight buildings are satisfied with the standards in their apartments, especially considering the sound transmission between neighboring apartments and from the outside of the building to their apartment, and if they would accept higher costs for a better sound insulation, i.e. an additional value created.

  • 283.
    Lindblad, Fredrik
    et al.
    ATEA Logistics.
    Schauerte, Tobias
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Flinkman, Matti
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Changes in Industry Structure and Concentration?: Welfare Loss due to Perfect Competition in the Swedish Industry for Wooden Single-Family Houses2016In: 70th Forest Products Society annual convention - new horizons for the forest products industry, June 27-29, 2016, Portland, Madison: Forest Products Society, 2016Conference paper (Refereed)
    Abstract [en]

    As studies based on data from 2012 show, the Swedish market for wooden single-family houses is highly competitive, with many firms offering relatively homogeneous products or services. In order to serve the demand on that market, only 38 % of the existing firms actually were needed. Thus, an uneven distribution of resource utilization let to welfare losses. Yet since 2012, the demand on the market increased by more than 35 %, which potentially had an effect on resource utilization.

    This study is aiming at describing the development of the structure and concentration in the Swedish industry for wooden single-family houses, for a five year period from 2010 to 2014. This could help to understand, if and how market demand affects structure, concentration rate and consequently welfare loss due to resource utilization. The required data were collected from the annual reports of the 52 relevant firms in the industry. By means of the Herfindahl-Hirschman Index and the Herfindahl-Hershamann Number Equivalent, industry structure and concentration rate was calculated.

    The results will show how the industry structure and concentration rate developed from 2010 to 2015, the distribution of resource for welfare purposes and thus, how many firms there actually were needed to serve the market.

  • 284.
    Lindblad, Fredrik
    et al.
    ATEA Logistics.
    Schauerte, Tobias
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Flinkman, Matti
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Evaluating profitability of Firms in the Swedish Industry for Wooden Single-Family Houses2016In: The 70th Forest Products Society annual convention - new horizons for the forest products industry, June 27-29, 2016, Portland, Madison: Forest Products Society, 2016Conference paper (Refereed)
    Abstract [en]

    The market for Swedish wooden single-family house producers is characterized by perfect competition, i.e. products are highly substitutional and firms mainly compete by prices. Variance in net profit margins, as a key number for profitability, for firms in this industry ranges by 60 %. As net profit margin is defined as net profit divided by revenue, these latter two directly affect net profit margin. Yet, leaving the obvious determining mathematical explanations aside, other factors might affect the profitability of the firms, showing, what distinguishes successful firms from less successful ones.

    This study is aiming at exploring the factors affecting the profitability of Swedish firms producing wooden single-family houses. By means of those factors, variances in net profit margins might be explained more thoroughly. Data from annual reports were collected from 52 firms in the industry and a correlation analysis performed.

    The results will show if there are factors that correlate with net profit margins and if yes, what explanatory power these factors have. This in turn might serve as an input for the firms’ strategic development towards a higher profitability of their businesses.

  • 285.
    Lindblad, Fredrik
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Schauerte, Tobias
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Johansson, Jimmy
    Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
    Identifying market mobility barriers for wooden single-family house producers to enter the multifamily segment2018In: Social Influences, Forest Products Society, 2018Conference paper (Refereed)
    Abstract [en]

    In the past decades, the housing shortage in Sweden accumulated to a level that led to acute problems for many people combined with continuously rising housing prices. The market for single-family houses, where wood dominates with 85 – 90 % of market share, is highly competitive with many companies offering relatively similar products or services. To serve the demand on that market, only 38 % of the existing companies were needed. One way to tackle the existing housing shortage, and to develop new business opportunities, could be to get more companies from the single-family house industry to produce multi-family houses. Current competence in prefabricated house production could be utilised, yet, other areas could act as barriers for these companies. The aim of this study is to identify potential market mobility barriers for Swedish companies currently producing wooden single-family houses to develop towards the construction of multi-family houses. This will be conducted by initial interviews with decision makers in those companies, combined with a survey-study covering companies within the industry. The results show that the main market mobility barriers are related to the strong market presence of traditional building materials, lack of knowledge by the market of wood as a suitable building material and the importance of governmental guidance and actions.

  • 286.
    Linderholt, Andreas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Model Calibration of an A600 Wind Turbine Blade2013In: Proceedings of the International Modal Analysis Conference (IMAC XXXI), Orange County, CA, 2013Conference paper (Refereed)
  • 287.
    Linderholt, Andreas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Revealing the Hidden Properties of the Non-linear Structural Identification Benchmark Properties2014In: International Modal Analysis Conference (IMAC XXXII), 3-6 February, 2014, 2014Conference paper (Refereed)
  • 288.
    Linderholt, Andreas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Transmission Simulator Mass Loading Effects in Experimental Substructuring: A Study of the Ampair 600 Benchmark System2018In: Dynamics of Coupled Structures, Volume 4: Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018 / [ed] Linderholt, A., Allen, M.S., Mayes, R.L., Rixen, D., Springer, 2018, Vol. 4, p. 15p. 127-141Conference paper (Other academic)
    Abstract [en]

    During the last years, a lot of research focusing on appropriate interfaces between substructures has been made; the transmission simulator method has become a tool in that strive. In this paper, possible sensitivity, related to ill-conditioning, of the end effects on assembled structures consisting of finite element substructure models representing experimental setups with different levels of transmission simulator mass loadings at their interfaces are studied. Here, components of the Society of Experimental Mechanics, SEM, substructuring focus group's benchmark; the Ampair A600 wind turbine, constitute the structure studied. Models of an A600 blade and bracket system attached to dummy masses of different sizes are coupled to models representing an A600 hub together with two blades attached to dummy masses of different sizes after numerical subtraction of the dummy masses on each of the substructures. The results are compared to data stemming from a model of the assembled system.

  • 289.
    Linderholt, Andreas
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Wind turbine blade modeling: setting out from experimental data2014In: LMS Nordic User Conference For Automotive And Mechanical Industry, Gothenburg, 27-28 Mars, 2014, 2014Conference paper (Other (popular science, discussion, etc.))
  • 290.
    Linderholt, Andreas
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Abrahamsson, Thomas
    Chalmers University of Technology.
    Computational Model Updating of a Fan Blade Using Optimal Robust Test Data2014In: Mechanical systems and signal processing, ISSN 0888-3270, E-ISSN 1096-1216Article in journal (Refereed)
  • 291.
    Linderholt, Andreas
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Abrahamsson, Thomas
    Chalmers.
    Robust Optimal Sensor Placement for Computational Model UpdatingIn: Mechanical systems and signal processing, ISSN 0888-3270, E-ISSN 1096-1216Article in journal (Refereed)
  • 292.
    Linderholt, Andreas
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Abrahamsson, Thomas
    Chalmers University of Technology.
    Johansson, Anders
    Chalmers University of Technology.
    Mahdiabadi, Morteza Karamooz
    Technical University of Munich, Germany.
    Rixen, Daniel
    Technical University of Munich, Germany.
    The Dynamic Behavior of Three Sets of the Ampair 600 Wind Turbine2016In: Proceedings of the International Modal Analysis Conference (IMAC XXXIV), 2016 / [ed] Society of Experimental Mechanics, SEM Society of Experimental Mechanics , 2016Conference paper (Other academic)
    Abstract [en]

    A modified version of the Ampair 600 wind turbine was defined by the SEM substructuring focus group to be a benchmark for use in the pursuit of developing methods for high precision experimental substructuring. Today, seven such, intended to be identical, systems have been assembled at test laboratories within Europe and the USA. This paper reports the experimentally found dynamic behavior of five out of the seven systems. The aim of the study is to provide high fidelity data to support future component synthesis and model validation activities. Comparisons are made by evaluating deviations of measured frequency response functions and identified structural eigenfrequencies together with the correlation between eigenvector estimates. The testing is made in two parts. First, partly assembled systems, not including the rotors or the blades, are tested. This constitutes one possible and logical subsystem splitting that is likely to appear in future substructure synthesis efforts. In the second part, the fully assembled benchmark systems are tested. The test procedure, the test setup, the obtained test data and test data statistics are presented.

  • 293.
    Linderholt, Andreas
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Abrahamsson, Thomas
    Chalmers University of Technology, Sweden.
    Johansson, Anders
    Chalmers University of Technology, Sweden.
    Steinepreis, Daniel
    University of Stuttgart, Germany.
    Reuss, Pascal
    University of Stuttgart, Germany.
    A Comparison of the Dynamic Behavior of Three Sets of the Ampair 600 Wind Turbine2015In: Dynamics of Coupled Structures: Proceedings of the 33rd IMAC, A Conference and Exposition on Structural Dynamics, 2015 / [ed] Matt Allen, Randall L. Mayes, Daniel J. Rixen, Springer Publishing Company, 2015, Vol. 4, p. 99-110Conference paper (Other academic)
    Abstract [en]

    The Ampair 600  wind turbine assembly has been modified to suit as a benchmark structure in the pursuit of finding best practices for experimental substructure coupling of structural dynamic systems. Seven such systems have been assembled in test laboratories in Europe and in the USA. We scrutinize the dynamic behavior of the total assembly of three of those by vibration testing and compare the test outcome from seemingly identical assemblies. The aim is to support future component synthesis activities with high fidelity data and support future model validation. Comparisons are made by evaluating deviations of measured frequency response functions, the differences of identified structural eigenfrequencies and the correlation between eigenvector estimates. The testing is made in two parts. First, a partly assembled system, not including the hub and blades, is tested. This constitutes one possible and logical subsystem splitting that is likely to appear in future substructure synthesis efforts. In the second part, the full system assembly is tested. The test procedure, the test setup, the obtained test data and test data statistics are presented.

  • 294.
    Linderholt, Andreas
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Chen, Yousheng
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Abrahamsson, Thomas
    Chalmers University of Technology.
    Time Domain Dynamic Simulations of Locally Nonlinear Large-Scale Systems2016In: Presented at Aerospace technology congress: The Swedish Aeronautics Congress in a Globaised world, October 11-12, 2016, 2016Conference paper (Other academic)
    Abstract [en]

    In practice, most mechanical systems show nonlinear characteristics within the operational envelope. However, the nonlinearities are often caused by local phenomena and many mechanical systems can be well represented by a linear model enriched with local nonlinearities. Conventional nonlinear response simulations are often computationally intensive; the problem which becomes more severe when large-scale nonlinear systems are concerned. Thus, there is a need to further develop efficient simulation techniques. In this work, an efficient simulation method for large-scale systems with local nonlinearities is proposed. The method is formulated in a state-space form and the simulations are done in the Matlab environment. The nonlinear system is divided into a linearized system and a nonlinear part represented as external nonlinear forces acting on the linear system; thus taking advantage in the computationally superiority in the locally nonlinear system description compared to a generally nonlinear counterpart. The triangular-order hold exponential integrator is used to obtain a discrete state-space form. To shorten the simulation time additionally, auxiliary matrices, similarity transformation and compiled C-codes (mex) to be used for the time integration are studied. Comparisons of the efficiency and accuracy of the proposed method in relation to simulations using the ODE45 solver in Matlab and MSC Nastran are demonstrated on numerical examples of different model sizes.

  • 295.
    Linderholt, Andreas
    et al.
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Chen, Yousheng
    Linnaeus University, Faculty of Technology, Department of Mechanical Engineering.
    Orlowitz, Esben
    University of Southern Denmark, Denmark.
    Brandt, Anders
    University of Southern Denmark, Denmark.
    A study of the coupling between test data accuracy and life prediction2014In: Proceedings of ISMA2014 including USD2014: 26th International Conference on Noise and Vibration Engineering and 5th International Conference on Uncertainty in Structural Dynamics, 15-17 September 2014, Leuven, Belgium / [ed] P. Sas, H. Denayer & D. Moens, Leuven: Katholieke Universiteit Leuven, Department of Mechanical Engineering , 2014, p. 415-428Conference paper (Other academic)
    Abstract [en]

    Computational models are regularly used to predict responses and the life of structures. Often, the computational models are validated by use of data stemming from vibration testing. However, the damping values are almost always taken from test alone and hence cannot be validated. Experimentally obtained damping values are well known to have relatively high uncertainties. In the present paper we investigate how life time predictions are affected by modal damping uncertainties by simulating responses due to random loads. The simulations are based on experimental modal analysis results of a structure consisting of two steel plates which are joined by bolts, tested under several different experimental support conditions. The results illustrate the importance of careful consideration of experimental test setups, as these can strongly affect the obtained damping estimates. This, in turn, can lead to large differences in predicted life time.

  • 296.
    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

  • 297.
    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.))
  • 298.
    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.

  • 299.
    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.

  • 300.
    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.

     

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