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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
25、r 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 -,-,- ii Foreword This Foreword is for information only, and is not a part of the American National Standard ANSI S12.5-2006
26、 / ISO 6926-1999 American National Standard Acoustics Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels. This standard comprises a part of a group of definitions, standards, and specifications for use in noise. It was develop
27、ed and approved by Accredited Standards Committee S12 Noise, under its approved operating procedures. Those procedures have been accredited by the American National Standards Institute (ANSI). The Scope of Accredited Standards Committee S12 is as follows: Standards, specifications, and terminology i
28、n the field of acoustical noise pertaining to methods of measurement, evaluation, and control; including biological safety, tolerance, and comfort, and physical acoustics as related to environmental and occupational noise. This standard is an identical national adoption of ISO 6926:1999. One clarifi
29、cation is given here and is not normative: There are certain applications for which users will require Reference Sound Source calibration in the 63-Hz octave band and/or up to the frequency of 20,000 Hz as mentioned in the note in 3.10. Users requiring RSS sound power calibration in the 63-Hz octave
30、 band should require that the sound power results down to the one-third octave frequency of 50 Hz be obtained according to Clause 3.10 and reported according to Clause 10. Users requiring RSS sound power calibration up to 20,000 Hz should similarly require appropriate measurements according to Claus
31、e 3.10 and reporting according to Clause 10. In conformance with ANSI and ISO rules, editorial modifications were made including: the addition of footnotes to update references to outdated/revised ISO standards, substitution of the words “American National Standard“ for “International Standard“, use
32、 of American English spelling in place of British English spelling, and substituting decimal points for the commas used in ISO documents. The ANSI equivalents for the ISO standards in the ISO 3740 series are given below: ANSI S12.50-2002/ISO 3740:2000 is an identical national adoption of ISO 3740:20
33、00; ANSI S12.51-2002/ISO 3741:1999 is an identical national adoption of ISO 3741:1999; ANSI S12.53/Part 1-1999/ISO 3743-1:1994 is an identical national adoption of ISO 3743- 1:1994; ANSI S12.53/Part 2-1999/ISO 3743-2:1994 is an identical national adoption of ISO 3743- 2:1994; ANSI S12.54-1999/ISO 37
34、44:1994 is an identical national adoption of ISO 3744:1994; ANSI S12.55-2006/ISO 3745:2003 is an identical national adoption of ISO 3745:2003; ANSI S12.56-1999/ISO 3746:1995 is an identical national adoption of ISO 3746:1995; and ANSI S12.57-2002/ISO 3747:2000 is an identical national adoption of IS
35、O 3747:2000. ANSI S12.50-2002/ISO 3740:2000 gives guidelines for the use of all the standards in the series. Copyright 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 n
36、etworking permitted without license from IHS -,-,- iii At the time this Standard was submitted to Accredited Standards Committee S12, Noise for approval, the membership was as follows: R.D. Hellweg, Chair W.J. Murphy, Vice-Chair S.B. Blaeser, Secretary Acoustical Society of AmericaB.M. Brooks Aearo
37、Company.E.H. Berger Air-Conditioning and Refrigeration InstituteR. Seel .D. Brown (Alt.) Alcoa Inc. .W.D. Gallagher American Industrial Hygiene Association.D. Driscoll .S.N. Hacker (Alt.) American Society of Heating, Refrigeration and Air-Conditioning Engineers.R.J. Peppin E. Rosenberg (Alt.) Americ
38、an Speech-Language-Hearing Association .L.A. Wilber .V. Gladstone (Alt.) Bruel FAX: 631-390-0217; E-mail: asastdsaip.org Copyright 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 repro
39、duction or networking permitted without license from IHS -,-,- vi Introduction Reference sound sources are used extensively in “comparison methods“ for determining the noise emissions of physically stationary sound sources. A reference sound source, of known sound power output, is used to establish
40、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 at a set of microphone positions. Once that relationship is established, it is straightforward to measure the average soun
41、d pressure level produced by an “unknown source“ and to determine the sound power level produced by that source. This American National Standard defines the important physical and performance characteristics of reference sound sources and specifies procedures for their calibration, primarily to dete
42、rmine the sound power level of other sound sources. This American National Standard supplements a series of American National Standards/International Standards, the ANSI S12.50/ISO 3740 series, that describes various methods for determining the sound power levels of machines and equipment. This seri
43、es specifies the acoustical requirements for measurements that are appropriate for different test environments. Five International Standards in the ISO 3740 series include procedures in which a reference sound source is used: ISO 3741, ISO 3743, ISO 3744, ISO 3746, and ISO 3747. ISO 3740 gives guide
44、lines for the use of all the International Standards in the series. It should be noted that the sound power output of reference sound sources will vary, in particular at low frequencies, with the distance from the source to nearby reflecting planes. Sound power data of reference sound sources are th
45、us valid only for the position used during the calibration. In addition to being useful for determining sound power levels by the comparison method, reference sound sources may be used for qualification tests on an acoustic environment and to estimate the influence of an acoustic environment on the
46、sound pressure levels produced by one or more sound sources located in that environment. Examples of International Standards referring to reference sound sources with these applications are ISO 11690-3 and ISO 14257. Requirements other than those of this American National Standard may be applicable
47、in these cases. Copyright 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 STANDARD ANSI S12.5-2006
48、 / ISO 6926:1999 Acoustical Society of America 2006 All rights reserved 1 American National Standard Acoustics Requirements for the Performance and Calibration of Reference Sound Sources Used for the Determination of Sound Power Levels 1 Scope This American National Standard specifies the acoustical performance requirements for reference sound sources: temporal steadiness and repeatability of the sound power output, spectral characteristics, directivity index. The stability of the