Record Display for the EPA National Library Catalog


Main Title Procedures for estimating sound power from measurements of sound pressure : an experimental investigation with application to noise from portable air compressors /
Author Holmer, Curtis I.
CORP Author National Bureau of Standards, Washington, D.C. Applied Acoustics Section.;Environmental Protection Agency, Washington, D.C. Office of Noise Abatement and Control.
Publisher National Bureau of Standards ; [Dept. of Commerce, NTIS],
Year Published 1975
Report Number EPA 550-8-76-001; NBSIR-75-652; NBS-2130152
Stock Number COM-75-11399/3
OCLC Number 20317421
Subjects Sound pressure--Measurement ; Noise control
Additional Subjects Compressor noise ; Power spectra ; Sound pressure ; Noise(Sound) ; Pollution ; Measurement ; Air compressors ; Tests ; Noise pollution ; Sound power
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD  EPA 550-8-76-001 Headquarters Library/Washington,DC 01/16/2020
ELBD ARCHIVE EPA 550-8-76-001 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ESAD  EPA 550-8-76-001 Region 10 Library/Seattle,WA 03/23/2010
NTIS  COM-75-11399/3 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 73 pages
The report describes investigations of the accuracy and precision of various measurement methodologies for determining the estimated sound power output of 'large' machines in the free field over a reflecting plane. One purpose of this investigation is to place empirical error bounds on many of the free field measurement procedures currently proposed or in use; and in particular, compare the results of near-field and far-field measurements. The sources used for the investigation included 17 portable air compressors of various types (powered by internal combustion engines), a reference sound source, and a loudspeaker driven by a pure tone source. The data recorded include sound pressure level (A-weighted, linear, and 1/3-octave band) on an 84 point hemispherical array of seven metre radius, and near-field measurements, sampled every square metre, on a rectangular surface one metre from the machine surface. These data were reduced to provide information on the deviation of near-field sound power determinations from far-field power level (using subsets of the data as appropriate to various methodologies).
"COM-75-11399." "EPA 550-8-76-001." "Final report." "July 1975." Cover title. Prepared for Office of Noise Abatement and Control, U.S. Environmental Protection Agency, Washington, D.C. 20460. Includes bibliographical references.