FE modeling of a lightweight structure with different junctions
2012 (English)In: Euronoise 2012-proceedings / [ed] Czech Acoustical Society, European Acoustics Association (EAA), 2012, 162-167 p.Conference paper (Refereed)
In lightweight structures it is common to use damping material in junctions to decrease sound transmission. In field measurements, the damping properties of the structure are easily overestimated due to the omnipresent energy losses to the surroundings. Thus, reliable estimates of structural properties cannot be guaranteed.
Vibrational tests were done on a full scale wooden construction, consisting of a floor and supporting beams, representing walls, to investigate the effect of different junctions. Totally seven different setups were made using the same building components. In one setup the floor and the walls were screwed together, in five setups different elastomers was positioned between the floor and the walls and in the last setup the floor was resting free on top of the walls. A shaker, with pseudorandom excitation, was used for the excitation of the structure and accelerometers were used for response measurements. The effect of the junction was investigated by studying the acceleration levels in the edge part of the floor-wall junction in different directions.
Modal data, extracted from test data using experimental modal analysis, form input and validation data for the following finite element (FE) analysis. Two FE models; modeling one elastomer and the screwed setup, are used for the studies.
The aim was to study if the eigenmodes rendering the acceleration levels are similar in test and in analysis, using common material properties.
The results from correlation between test and analytical results show that the material properties of the wood need to be known better; more sophisticated models are needed to fully simulate the dynamic behavior of the structure. Anyhow, with the used properties the mode shapes are captured fairly well in the lower frequencies. Furthermore, the experiment shows that the damping properties of the junction material have a major influence on the behavior of the structure.
Place, publisher, year, edition, pages
European Acoustics Association (EAA), 2012. 162-167 p.
, Euronoise proceedings, ISSN 2226-5147
Lightweight structure finite element dynamic
Research subject Technology (byts ev till Engineering), Civil engineering
IdentifiersURN: urn:nbn:se:lnu:diva-21194ISBN: 978-80-01-05013-2OAI: oai:DiVA.org:lnu-21194DiVA: diva2:544466
Ninth European Conference on Noise Control (Euronoise), Prague, 10-13 June, 2012