ASA-S12.5-2006.pdf
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1、 ANSI S12.5-2006 / ISO 6926:1999 (Revision of ANSI S12.5-1990) AMERICAN NATIONAL STANDARD Acoustics Requirements for the Performance and Calibration of Reference Sound Sources Used for the Determination of Sound Power Levels (A Nationally Adopted International Standard) Accredited Standards Committe
2、e S12, Noise Standards Secretariat Acoustical Society of America 35 Pinelawn Road, Suite 114 E Melville, NY 11747-3177 NAIS STANDARD ANSI S12.5-2006 / ISO 6926:1999 Copyright Acoustical Society of America Provided by IHS under license with ASA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not
3、 for Resale, 04/18/2007 10:08:07 MDTNo reproduction or networking permitted without license from IHS -,-,- The American National Standards Institute, Inc. (ANSI) is the national coordinator of voluntary standards development and the clearinghouse in the U.S.A. for information on national and interna
4、tional standards. The Acoustical Society of America (ASA) is an organization of scientists and engineers formed in 1929 to increase and diffuse the knowledge of acoustics and to promote its practical applications. Copyright Acoustical Society of America Provided by IHS under license with ASA License
5、e=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 10:08:07 MDTNo reproduction or networking permitted without license from IHS -,-,- ANSI S12.5-2006 / ISO 6926:1999 (Revision of ANSI S12.5-1990) AMERICAN NATIONAL STANDARD Acoustics Requirements for the Performance and Calibrat
6、ion of Reference Sound Sources Used for the Determination of Sound Power Levels Secretariat Acoustical Society of America Approved 18 December 2006 American National Standards Institute, Inc. Abstract Reference sound sources are used extensively in “comparison methods“ for determining the noise emis
7、sions of physically stationary sound sources. A reference sound source, of known sound power output, is used to establish the numerical relationship between the sound power level of a source, in a given location in a given acoustical environment and the space- and time-averaged sound pressure level
8、at a set of microphone positions. Once that relationship is established, it is straightforward to measure the average sound pressure level produced by an “unknown source“ and to determine the sound power level produced by that source. This is an identical national adoption of ISO 6926:1999. Copyrigh
9、t Acoustical Society of America Provided by IHS under license with ASA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 10:08:07 MDTNo reproduction or networking permitted without license from IHS -,-,- AMERICAN NATIONAL STANDARDS ON ACOUSTICS The Acoustical Society of
10、 America (ASA) provides the Secretariat for Accredited Standards Committees S1 on Acoustics, S2 on Mechanical Vibration and Shock, S3 on Bioacoustics, and S12 on Noise. These committees have wide representation from the technical community (manufacturers, consumers, trade associations, organizations
11、 with a general interest, and government representatives). The standards are published by the Acoustical Society of America as American National Standards after approval by their respective Standards Committees and the American National Standards Institute. These standards are developed and publishe
12、d as a public service to provide standards useful to the public, industry, and consumers, and to Federal, State, and local governments. Each of the accredited Standards Committees operating in accordance with procedures approved by American National Standards Institute (ANSI) is responsible for deve
13、loping, voting upon, and maintaining or revising its own Standards. The ASA Standards Secretariat administers Committee organization and activity and provides liaison between the Accredited Standards Committees and ANSI. After the Standards have been produced and adopted by the Accredited Standards
14、Committees, and approved as American National Standards by ANSI, the ASA Standards Secretariat arranges for their publication and distribution. An American National Standard implies a consensus of those substantially concerned with its scope and provisions. Consensus is established when, in the judg
15、ment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered and that a con
16、certed effort be made towards their resolution. The use of an American National Standard is completely voluntary. Their existence does not in any respect preclude anyone, whether he or she has approved the Standards or not, from manufacturing, marketing, purchasing, or using products, processes, or
17、procedures not conforming to the Standards. NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this Standard. Acoustical Society of Ame
18、rica ASA Secretariat 35 Pinelawn Road, Suite 114E Melville, New York 11747-3177 Telephone: 1 (631) 390-0215 Fax: 1 (631) 390-0217 E-mail: asastdsaip.org 2006 by Acoustical Society of America. This standard may not be reproduced in whole or in part in any form for sale, promotion, or any commercial p
19、urpose, or any purpose not falling within the provisions of the U.S. Copyright Act of 1976, without prior written permission of the publisher. For permission, address a request to the Standards Secretariat of the Acoustical Society of America. Copyright Acoustical Society of America Provided by IHS
20、under license with ASA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 10:08:07 MDTNo reproduction or networking permitted without license from IHS -,-,- i Contents 1 Scope . 1 2 Normative references. 2 3 Terms and definitions. 2 4 Measurement uncertainty. 4 5 Perform
21、ance requirements. 5 5.1 General . 5 5.2 Temporal steadiness and repeatability of sound power output 5 5.3 Total broad-band sound power level. 6 5.4 Spectral characteristics. 6 5.5 Directivity index. 6 5.6 Recalibration. 7 6 Installation and operation of the reference sound source during calibration
22、 . 7 6.1 General . 7 6.2 Position of the reference source.7 7 Calibration procedure in hemi-anechoic rooms 8 7.1 Test environment 8 7.2 Microphone . 8 7.3 Microphone positions 8 7.4 Measurements 9 7.5 Air absorption 9 7.6 Calculations. 10 8 Calibration procedure in reverberation rooms 10 8.1 Test en
23、vironment 10 8.2 Microphone . 11 8.3 Microphone positions 11 8.4 Measurements 11 8.5 Calculations. 11 9 Information to be recorded. 11 10 Information to be reported 11 Tables Table 1 Estimated upper values of the standard deviations of reproducibility of sound power levels of reference sound sources
24、 determined according to this American National Standard. 5 Table 2 Maximum value of the standard deviation of the sound power level under repeatability conditions for a reference sound source according to this American National Standard 6 Copyright Acoustical Society of America Provided by IHS unde
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