Sound transmission loss: comparison conventional techniques with sound intensity techniques

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TypeArticle
Journal titleJournal of the Acoustical Society of America
ISSN0001-4966
Volume77
Issue6
Pages20942103; # of pages: 10
Subjectsound transmission loss; sound intensity; high frequencies (sound); low frequencies (sound); test methods; single long wall; reverberation room facility measurement; astm e90 methods; various absorptive conditions; low and high frequencies' variances; waterhouse effect; Sound transmission & insulation; perte de transmission sonore; intensite acoustique; frequence aigue; frequence grave
AbstractSound transmission losses for a single layer wall are measured in a reverberation room facility using conventional methods (ASTM E90) and the more recently introduced sound intensity method. The specimen is placed in five positions in the tunnel between the two reverberation rooms and measurements are made for four different absorptive conditions in the smaller room. Significant differences between the two measurement techniques are found at low frequencies and at high frequencies. Low-frequency differences are attributed partly to the increase in sound energy close to the surfaces of the receiving room (the Waterhouse effect) and the lack of any consideration of this in standard test methods. Inclusion of the Waterhouse term in the conventional transmission loss formula improves the agreement between the conventional and the sound intensity measurement technique at low frequencies. High-frequency differences are not explained.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
IdentifierDBR-P-1299
NRC number24689
4388
NPARC number20358541
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Record identifierffe2af1c-9936-4032-a404-7f7e000668fe
Record created2012-07-20
Record modified2016-05-09
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