Dependency between standardized heavy impact sound pressure level and receiving room properties

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ConferenceInter-Noise 2011: 04 September 2011, Osaka, Japan
Pages16; # of pages: 6
Subjectsound insulation, impact sound, bang-machine, reverberation time, absorption; Sound transmission & insulation
AbstractLow frequency impact sound is a common problem in residential buildings. Japan and Korea acknowledge this issue in their standards (JIS 1418-2, KS F 2810-2) with test protocols for measuring low frequency impact sound using two unique heavy impact sources. One is a well-defined small car tire - the ?bang-machine? - and the other is a rubber ball. Both are dropped from defined heights on the floor under investigation. In the receiving room the fast-weighted maximum sound pressure level of the generated sound impulse is averaged over several drop and receiver positions. As opposed to the light impact standards (JIS 1418-1, KS F 2810-1), the receiving room properties, namely volume and absorption, are not taken into account during post processing of measurement data. Results of a recent study, in which nominally identical floors were tested in two facilities that differ grossly in volume and absorption, are be presented in this paper. A dependency between the measured heavy impact sound pressure levels and the receiving room properties was established. Thus, measured data must be normalized to volume and absorption to allow a comparison of heavy impact sound ratings of different facilities or in-situ. For the normalization to the room volume, an existing method of other protocols (ISO 10140 for quasi-stationary impact sound) was applied to heavy impact sound data and validated. However, for absorption the existing methods failed. A new normalization term was derived theoretically for the fast-weighted maximum sound pressure level of a sound impulse and validated with heavy impact sound measurements.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number54476
NPARC number20374417
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Record identifierb71575b7-9f5b-45ac-b26d-a7901d200e74
Record created2012-07-23
Record modified2016-05-09
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