On a semi-empirical approach to predicting sound insulation in lightweight framed construction

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ConferenceInter-Noise 2007: 28 August 2007, Istanbul, Turkey
Pages19; # of pages: 9
Subjectsound transmission, flanking, wood-framed; Sound transmission & insulation
AbstractPredicting the apparent airborne and impact sound insulation of lightweight framed constructions is very challenging, particularly if the approach is to be sufficiently simple for standardization. There are two basic approaches ? semi-empirical or statistical energy analysis (SEA). The SEA approach is considered in an associated InterNoise 2007 paper entitled, ?Measurement and prediction of flanking transmission through gypsum board walls with modified SEA method?. This paper explores the strengths and weaknesses of the semi-empirical approach by considering flanking involving the wall/floor junction as an example. Flanking path power flow is defined by five transmission factors whose combined effect is characterized by a path transfer function specific to the type of excitation (airborne or impact) and the construction detail. For similar constructions, path estimates are obtained by adding a correction to account for the mounting, number, and type of layers of the flanking surface. Unfortunately, to deal with junction attenuation, a unique transfer function is required for each major type of structural framing at the junction (i.e., joist orientation and continuity). Relatively few transfer functions are required to accurately predict a large number of practical construction scenarios including the effect of toppings on floors and the mounting of the gypsum board on walls and ceilings.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number49505
NPARC number20377387
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Record identifier6cb314cd-06ec-45ed-8e43-7c766cf14726
Record created2012-07-24
Record modified2016-05-09
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