Error in predicted flanking sound reduction index due to reduction of average area in velocity measurements

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Conference1st EAA - EUROREGIO 2010 Congress on Sound and Vibration: 15 September 2010, Ljubljana, Slovenia
Pages18; # of pages: 8
SubjectBuilding acoustics, flanking sound transmission, prediction, velocity level difference; Flanking
AbstractIn a recent research project equations for the prediction of flanking sound transmission through lightweight framed assemblies are derived in a statistical energy analysis (SEA) framework and prediction results are validated with well established measurement method. The equations of the new method are similar to those of the EN 12354 method for heavy homogenous monolithic structures that are weakly damped and support a diffuse structure-borne wave field. However, good prediction results are obtained with the new method only if measured velocity level differences are used as input data because propagation of bending waves is strongly attenuated in lightweight framed structures due to the fairly high loss factor of the structure in combination with the rather short bending wavelength of the leaves. The great velocity gradient on the receive element leads to the assumption that most sound power is radiated by the area of high velocity close to the junction into the receive room. Good prediction results are also obtained when the area that is considered on the receive leaf for the velocity level measurement is reduced moderately and the element area in the prediction is adjusted accordingly. The change in flanking sound reduction index due to this area reduction is investigated more thoroughly in this paper and a simple model of a plane propagating banding wave on a damped infinite plate is used to estimate the error in the prediction.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number53549
NPARC number20374878
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Record identifier0f5a38b6-8e96-4431-bcaf-0dfec3448987
Record created2012-07-23
Record modified2016-05-09
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