1、 ANSI/ASA S12.57-2011 / ISO 3747:2010 (a revision of ANSI S12.57-2002 / ISO 3747:2000) AMERICAN NATIONAL STANDARDAcoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Engineering/survey methods for use in situ in a reverberant environment(a Natio
2、nally Adopted International Standard) Accredited Standards Committee S12, NoiseStandards Secretariat Acoustical Society of America 35 Pinelawn Road, Suite 114 E Melville, NY 11747-3177ANSI/ASA S12.57-2011/ ISO 3747:20105HDIILUPHGE$16,-XOThe American National Standards Institute, Inc. (ANSI) is the n
3、ational coordinator of voluntary standards development and the clearinghouse in the U.S.A. for information on national and international 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
4、 and to promote its practical applications. ANSI/ASA S12.57-2011 / ISO 3747:2010 AMERICAN NATIONAL STANDARD Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Engineering/survey methods for use in situ in a reverberant environment (a nationall
5、y adopted international standard) Secretariat: Acoustical Society of America Approved on August 26, 2011 by: American National Standards Institute, Inc. Abstract This American National Standard specifies a method for determining the sound power level or sound energy level of a noise source by compar
6、ing measured sound pressure levels emitted by a noise source (machinery or equipment) mounted in situ in a reverberant environment, with those from a calibrated reference sound source. The sound power level (or, in the case of noise bursts or transient noise emission, the sound energy level) produce
7、d by the noise source, in frequency bands of width one octave, is calculated using those measurements. The sound power level or sound energy level with frequency A-weighting applied is calculated using the octave-band levels. AMERICAN NATIONAL STANDARDS ON ACOUSTICS The Acoustical Society of America
8、 (ASA) provides the Secretariat for Accredited Standards Committees S1 on Acoustics, S2 on Mechanical Vibration and Shock, S3 on Bioacoustics, S3/SC 1 on Animal Bioacoustics, and S12 on Noise. These committees have wide representation from the technical community (manufacturers, consumers, trade ass
9、ociations, organizations 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 (ANSI). These stand
10、ards are developed and published 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 ANSI) is responsible for developing,
11、 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 Committ
12、ees, 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 judgment of
13、 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 concerted
14、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 procedu
15、res 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 America AS
16、A 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 2011 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 purpose,
17、 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. 2011 Acoustical Society of AmericaAll rights reserved. i Conten
18、ts 1 Scope . 1 1.1 General . 1 1.2 Types of noise and noise sources 1 1.3 Test environment 1 1.4 Measurement uncertainty . 1 2 Normative references . 2 3 Terms and definitions . 2 4 Test environment . 6 4.1 Criterion for acoustic adequacy of test environment 6 4.2 Criterion for background noise . 6
19、5 Instrumentation and measurement equipment 7 5.1 General . 7 5.2 Calibration . 7 6 Location, installation and operation of noise source under test. 7 6.1 Source location and installation 7 6.2 Auxiliary equipment 8 6.3 Operation of source during test 8 7 Measurement procedure 8 7.1 General . 8 7.2
20、Characterization of noise source under test . 9 7.3 Locations of the reference sound source . 9 7.4 Microphone positions 10 7.5 Measurement of sound pressure levels for a noise source which emits steady or non-steady noise . 11 7.6 Measurement of sound pressure levels for a noise source which emits
21、impulsive noise 12 8 Calculation of sound power levels and sound energy levels . 12 8.1 Corrections for background noise . 12 8.2 Mean time-averaged sound pressure levels for a noise source which emits steady or non-steady noise 13 8.3 Sound power levels 14 8.4 Mean single event sound pressure level
22、 for a noise source which emits impulsive noise . 14 8.5 Sound energy levels . 16 8.6 A-weighted sound power level and A-weighted sound energy level 16 9 Measurement uncertainty 16 9.1 Methodology . 16 9.2 Determination of omc. 17 9.3 Determination of R018 9.4 Typical upper bound values of R019 9.5
23、Total standard deviation, tot, and expanded uncertainty, U . 20 10 Information to be recorded . 20 10.1 General . 20 ii 2011 Acoustical Society of AmericaAll rights reserved. 10.2 Noise source under test 20 10.3 Test environment 20 10.4 Instrumentation . 21 10.5 Acoustic data 21 11 Test report 22 An
24、nex A (normative) Evaluation of the excess of sound pressure level at a given distance . 23 Annex B (informative) Recommendations for the location of the reference sound source and the microphones, if only one position is used for the reference sound source . 24 B.1 General . 24 B.2 Recommendation 1
25、. 24 B.3 Recommendation 2. 26 B.4 Recommendation 3. 27 B.5 Recommendation 4. 27 Annex C (normative) Sound power level and sound energy level under reference meteorological conditions 29 Annex D (normative) Calculation of A-weighted sound power levels and A-weighted sound energy levels from octave-ba
26、nd levels 31 D.1 A-weighted sound power levels 31 D.2 A-weighted sound energy levels . 31 D.3 Values of k and Ckfor use in calculations 31 Annex E (informative) Guidance on the development of information on measurement uncertainty . 33 E.1 General . 33 E.2 Considerations on the total standard deviat
27、ion, tot33 E.3 Considerations on omc. 34 E.4 Considerations on R0. 35 E.5 Combined standard uncertainty 44 E.6 Measurement uncertainty based on reproducibility data 44 Bibliography 45 Figures Figure B.1 Positions for the reference sound source when the noise source under test is fairly omnidirection
28、al . 25 Figure B.2 Positions for the reference sound source when the noise source under test is fairly directional . 25 Figure B.3 Position for the reference sound source when the dominant component of the noise source under test is fairly omnidirectional 26 Figure B.4 Position for the reference sou
29、nd source when the dominant component of the noise source under test is fairly directional . 26 Figure B.5 Zone where one microphone is to be located when the reference sound source is screened by the noise source under test . 27 2010 Acoustical Society of AmericaAll rights reserved. iii Figure B.6
30、Plan view of the noise source under test and reference sound source, showing microphone positioning 28 Tables Table 1 Zones of the test environment . 11 Table 2 Typical upper bound values of the standard deviation of reproducibility of the method, R0, for A-weighted sound power levels and sound ener
31、gy levels determined in accordance with this American National Standard 19 Table D.1 Values of k and Ckfor mid-band frequencies of octave-bands . 32 Table E.1 Examples of calculated total standard deviations, tot, for three different cases . 35 Table E.2 Uncertainty budget for determinations of R0fo
32、r sound power level and sound energy level, valid for frequencies from 500 Hz to 4 kHz, or for A-weighted measurements of a source with a relatively flat frequency spectrum . 38 iv 2011 Acoustical Society of AmericaAll rights reserved. Foreword This Foreword is for information only and is not a part
33、 of the American National Standard ANSI/ASA S12.57-2011 / ISO 3747:2010 American National Standard Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Engineering/survey methods for use in situ in a reverberant environment. This standard compri
34、ses a part of a group of definitions, standards, and specifications for use in noise. It was developed 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 Sc
35、ope of Accredited Standards Committee S12 is as follows: Standards, specifications, and terminology in 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
36、and occupational noise. This standard is a revision of ANSI S12.57-2002 / ISO 3747:2000, which has been technically revised. This Standard is identical to International Standard ISO 3747, Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Engi
37、neering/survey methods for use in situ in a reverberant environment, which was prepared by Technical Committee ISO/TC 43 Subcommittee SC 1, Noise. However, in conformance with ANSI and ISO rules, the words “American National Standard“ replace the words “International Standard“ where they appear in t
38、he ISO document, decimal points were substituted in place of the decimal commas used in ISO documents, and American English spelling is used in place of British English spelling. The ANSI or ANSI/ASA equivalents for the ISO standards in the ISO 3740 series and other referenced nationally adopted sta
39、ndards are given below: ANSI S12.5 / ISO 6926 is an identical national adoption of ISO 6926; ANSI/ASA S12.50/ISO 3740 is an identical national adoption of ISO 3740; ANSI/ASA S12.51/ISO 3741 is an identical national adoption of ISO 3741; ANSI/ASA S12.53/Part 1/ISO 3743-1 is an identical national adop
40、tion of ISO 3743-1; ANSI/ASA S12.53/Part 2/ISO 3743-2 is an identical national adoption of ISO 3743-2; ANSI/ASA S12.54/ISO 3744 is an identical national adoption of ISO 3744; ANSI S12.55/ISO 3745 is an identical national adoption of ISO 3745; ANSI/ASA S12.56/ISO 3746 is an identical national adoptio
41、n of ISO 3746; and ANSI/ASA S12.57/ISO 3747 is an identical national adoption of ISO 3747. At the time this Standard was submitted to Accredited Standards Committee S12, Noise, for approval, the membership was as follows: W.J. Murphy, Chair R.D. Hellweg, Vice-Chair S.B. Blaeser, Secretary 3M Occupat
42、ional Health FAX: 631-390-0217; E-mail: asastdsaip.org. viii 2011 Acoustical Society of AmericaAll rights reserved. Introduction This American National Standard is a national adoption of one of the series ISO 37412to ISO 3747, which specify various methods for determining the sound power levels and
43、sound energy levels of noise sources including machinery, equipment and their sub-assemblies. The selection of one of the methods from the series for use in a particular application depends on the purpose of the test to determine the sound power level or sound energy level and on the facilities avai
44、lable. General guidelines to assist in the selection are provided in ISO 37401. ISO 37401to ISO 3747 give only general principles regarding the operating and mounting conditions of the machinery or equipment for the purposes of the test. It is important that test codes be established for individual
45、kinds of noise source, in order to give detailed requirements for mounting, loading, and operating conditions under which the sound power levels or sound energy levels are to be obtained. The method given in this American National Standard is based on a comparison of the sound pressure levels in oct
46、ave frequency bands of a noise source under test with those of a calibrated reference sound source; A-weighted sound power levels or sound energy levels may be calculated from the octave-band levels. The method is applied where the noise source is found in situ and as such is suitable for larger pie
47、ces of stationary equipment which, due to their manner of operation or installation, cannot readily be moved. The method specified in this American National Standard permits the determination of the sound power level and the sound energy level in octave bands from which the A-weighted value is calcu
48、lated. This American National Standard describes a method giving results of either ISO 12001:1996, accuracy grade 2 (engineering grade) or ISO 12001:1996, accuracy grade 3 (survey grade), depending on the extent to which the requirements concerning the test environment are met. For applications wher
49、e greater accuracy is required, reference can be made to ISO 37412, ISO 37445or an appropriate part of ISO 961417-19. If the relevant criteria for the measurement environment specified in this American National Standard are not met, it might be possible to refer to another standard from this series, or to an appropriate part of ISO 961417-19. AMERICAN NATIONAL STANDARD ANSI/ASA S12.57-2011 / ISO 3747:2010 2011 Acoustical Society of Ameri
