Record Display for the EPA National Library Catalog


Main Title Comparison of Sound Power Determinations Conducted in Four Different Acoustic Environments.
Author Mansbach, Peter A. ;
CORP Author National Bureau of Standards, Washington, DC. ;Environmental Protection Agency, Washington, DC. Office of Noise Abatement and Control.
Year Published 1978
Stock Number PB-288 033
Additional Subjects Acoustic measurement ; Power measurement ; Noise levels
Library Call Number Additional Info Location Last
NTIS  PB-288 033 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 8p
The sound power levels emitted by five vacuum cleaners and one reference sound source were determined in four different acoustic environments in accordance with appropriate domestic and international measurement standards, and also using only four measurement locations, to ascertain any differences between the various procedures. The study shows general agreement among the results, (rms differences between A-weighted sound power levels of 1.0 to 1.5 dB). Determinations conducted in the reverberation room appear systematically low by about 0.8 dB (A-weighted sound power level); determinations made using four microphones may be biased if the microphones are located too close to the source. Use of the comparison (reference sound source) method eliminated systematic bias and improved the agreement between environments (rms differences of 0.5 to 1.0 dB).