Laboratory methods for measuring low-frequency sound emission

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Journal titleASHRAE Transactions
Pages10441056; # of pages: 13
SubjectAcoustics and Noise Control; Acoustics; Acoustique et contrôle des bruits
AbstractASHRAE research project 624-RP investigated measurement procedures for extending the frequency range of sound power tests in reverberation rooms down to the 63-Hz and 31-Hz octave bands both for broad-band and discrete frequency sound sources. There were four main areas of investigation: (1) a literature review, (2) a detailed study of the sound field in a model reverberation room, (3) a study of the reproducibility of the substitution method for both one-third-octave and single-frequency measurements in a number of reverberation rooms with different sizes and configurations, and (4) calibration of the sound sources used in the investigation by the intensity scan method. The project results suggest that the substitution method is the most suitable method for measuring sound power at low frequencies in reverberation rooms. The reproducibility and accuracy of the method, while larger than the values at frequencies of 10 Hz and above, appear to be acceptable.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
NoteAlso presented at the ASHRAE Annual Meeting held in Denver, CO, USA on June 26-30, 1993
Peer reviewedYes
NRC number36106
NPARC number20386716
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Record identifier6e53ba1b-c350-4fbf-ac08-1b1c3c994286
Record created2012-07-25
Record modified2016-05-09
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