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Structural Vibrations of Wooden House Walls
Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
2006 (English)In: Journal of BUILDING ACOUSTICS, Vol. 13, no 4, p. 285-293Article in journal (Refereed) Published
Abstract [en]

The flanking transmission between apartments due to a structure borne source is studied. The apartments studied were two-storey houses with a wooden framework. Acoustic measurements are often made in new built apartments to make sure that they fulfil the building regulations. Traditional measurements give no information about the contribution of the surrounding walls to the sound transmission.

This paper describes a method of measuring flanking transmission. The acceleration levels on the receiving parts in the apartment below the source are studied. Thereby the contribution to the sound pressure in the room from each flanking part can be distinguished.

Place, publisher, year, edition, pages
MULTI-SCIENCE PUBLISHING CO. LTD. , 2006. Vol. 13, no 4, p. 285-293
Keywords [en]
Wooden framework, Impact noise, Vibration, Accelometer measurement
National Category
Fluid Mechanics and Acoustics
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:vxu:diva-1278OAI: oai:DiVA.org:vxu-1278DiVA, id: diva2:205077
Available from: 2007-05-15 Created: 2007-05-15 Last updated: 2013-02-28Bibliographically approved
In thesis
1. Structural-acoustic vibrations in wooden assemblies:: Experimental modal analysis and finite element modelling
Open this publication in new window or tab >>Structural-acoustic vibrations in wooden assemblies:: Experimental modal analysis and finite element modelling
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
VIBRATIONER OCH STOMBURET LJUD I TRÄKONSTRUKTIONER : Experimentell modalanalys och finit elementmodellering
Abstract [en]

This doctoral thesis concerns flanking transmission in light weight, wooden multi-storey buildings within the low frequency, primarily 20-120 Hz. The overall aim is to investigate how the finite element method can contribute in the design phase to evaluate different junctions regarding flanking transmission.

Two field measurements of accelerations in light weight wooden buildings have been evaluated. In these, two sources; a stepping machine, and an electrodynamic shaker, were used. The shaker was shown to give more detailed information. However, since a light weight structure in field exhibit energy losses to surrounding building parts, reliable damping estimates were difficult to obtain.

In addition, two laboratory measurements were made. These were evaluated using experimental modal analysis, giving the eigenmodes and the damping of the structures. The damping for these particular structures varies significantly with frequency, especially when an elastomer is used in the floor-wall junction. The overall damping is also higher when elastomers are used in the floor-wall junction in comparison to a screwed junction. By analysing the eigenmodes, using the modal assurance criterion, of the same structure with two types of junctions it was concluded that the modes become significantly different. Thereby the overall behavior differs.

Several finite element models representing both the field and laboratory test setups have been made. The junctions between the building blocks in the models have been modeled using tie or springs and dashpots. Visual observation and the modal assurance criterion show that there is more rotational stiffness in the test structures than in the models.

The findings in this doctoral thesis add understanding to how modern joints in wooden constructions can be represented by FE modelling. They will contribute in developing FE models that can be used to see the acoustic effects prior to building an entire house. However, further research is still needed.

Abstract [sv]

Denna doktorsavhandling behandlar flanktransmission i flervåningshus med trästomme, inom det lågfrekventa området, främst 20-120 Hz. Det övergripande målet är att undersöka hur finita elementmetoden kan bidra i konstruktionsfasen för att utvärdera olika knutpunkters inverkan på flanktransmissionen.

Två fältmätningar av accelerationer i trähus har utvärderats. I dessa har två olika lastkällor använts, i den första en stegljudsapparat och i den andra en elektrodynamisk vibrator (shaker). Det visades att shakern kan ge mer detaljerad information, men eftersom vibrationerna även sprider sig till omgivande byggnadsdelar vid fältmätningarna var det svårt att estimera tillförlitliga dämpningsdata även då shaker användes.

Fältmätningarna följdes av två mätningar i laborationsmiljö. Dessa två experiment utvärderades med experimentell modalanalys, vilket ger egenmoder och dämpning hos strukturerna. Dämpningen för dessa trähuskonstruktioner varierar kraftigt med frekvens. Extra stora variationer registreras då en elastomer användes i knutpunkten mellan golv och vägg. Den totala dämpningen är generellt högre när elastomerer används i knutpunkten mellan golv och vägg i jämförelse med då knutpunkten är skruvad. Genom att analysera egenmoder och deras korrelationer (MAC), för samma trästruktur men med olika typer av knutpunkter, drogs slutsatsen att knutpunkten drastiskt förändrar strukturens dynamiska beteende.

Flera finita elementmodeller av både fält- och laboratorieuppställningar har gjorts. I dessa har knutpunkterna mellan byggnadsdelar modellerats helt styvt eller med hjälp av fjädrar och dämpare. Visuella observationer av egenmoder och korrelationen dem emellan visar att det finns mer rotationsstyvhet i försöken än i finita elementmodellerna.

Resultaten i denna doktorsavhandling har gett förståelse för hur knutpunkter i träkonstruktioner beter sig och kan simuleras med finit elementmodellering. Vidare kan resultaten bidra till utvecklingen av FE-modeller som kan användas för att kunna se de akustiska effekterna redan under konstruktionsstadiet. Dock behövs ytterligare forskning inom området.

Place, publisher, year, edition, pages
Växjö, Sweden: Linnaeus University Press, 2013. p. 100
Series
Linnaeus University Dissertations ; 115/2013
Keywords
wooden framed structure, light weight buildings, multi-storey, flanking transmission, junction, vibration distribution, impact noise, damping, elastomers, finite element analysis, experimental modal analysis, FRF, trästomme, träkonstruktion, träbyggnad, flervåningshus, EMA, FEM, flanktransmission, koppling, knutpunkt, vibrationsspridning, stomljud, stegljud, dämpning, elastomerer, finit elementmetod, experimentell modalanalys, accelerationsmätning, frekvensresponsfunktion, modalanalys
National Category
Building Technologies Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:lnu:diva-24562 (URN)978-91-87427-04-6 (ISBN)
Public defence
2013-03-15, Södrasalen, Hus M, Lückligs Plats 1, VÄXJÖ, Sweden, 14:24 (Swedish)
Opponent
Supervisors
Available from: 2013-02-28 Created: 2013-02-25 Last updated: 2013-02-28Bibliographically approved

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Bolmsvik, Åsa

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