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Title:

Noise Test Codes Used in the Air Compressor Industry

Accession Number:

01054312

Record Type:

Component

Availability:

Institute of Noise Control Engineering

Iowa State University, 210 Marston Hall
Ames, IA 50011-2153 United States

Abstract:

This paper describes how the test code currently used today by American and European manufacturers of air compressors has been replaced with a new measurement standard. The new standard, ISO 2151, specifies that compressor manufacturers must now declare the A-weighted sound power level and the A-Weighted uncertainty level. Most compressor manufacturers will use a measurement uncertainty of +3 dB unless they can prove that the uncertainty statistically differs from 3 dB. The determination of the sound power level can be done using one of the following four methods: (1) measuring sound pressure over a free field reflecting plane with the microphones positioned on a parallel-piped reference surface; (2) measuring sound pressure over a free field reflecting plane with the microphones positioned on a hemispherical reference surface; (3) measuring sound intensity at discrete points over a free field reflecting plane; and (4) measuring sound intensity using the scanning method over a free field reflecting plane. The test engineer is free to choose the measurement technique; however, it is important for the test engineer to avoid measurement errors due to the package discharge with air-cooled machines and excess ground attenuation when making measurements on a free field reflecting plane.

Monograph Accession #:

01054353

Language:

English

Corporate Authors:

Institute of Noise Control Engineering

Iowa State University, 210 Marston Hall
Ames, IA 50011-2153 United States

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Lucas, Michael J

Editors:

Burroughs, Courtney B
Maling, George C

Pagination:

pp 583-592

Publication Date:

2004

Conference:

Noise-Con 04. The 2004 National Conference on Noise Control Engineering

Location: Baltimore Maryland, United States
Date: 2004-7-12 to 2004-7-14
Sponsors: Institute of Noise Control Engineering; Transportation Research Board

Media Type:

CD-ROM

Features:

Figures (5) ; References (9) ; Tables (1)

Uncontrolled Terms:

Noise measurement

Subject Areas:

Energy; Environment; Highways; I15: Environment

Files:

TRIS, TRB

Created Date:

Jul 25 2007 2:15PM