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1、ANSI S12.5311-1999 IS0 3743-1 : 1994 AMERICAN NATIONAL STANDARD Acoustics - Determination of sound power levels of noise sources - Engineering methods for small, movable sources in reverberant fields - Part 1: Comparison method for hard-walled test rooms (A Nationally Adopted International Standard)
2、 Accredited Standards Committee SI 2, Noise Standards Secretariat Acoustical Society of America 35 Pinelawn Road, Suite 114 E Melville, NY 11 747-31 77 Copyright Acoustical Society of America Provided by IHS under license with ASA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale,
3、04/18/2007 10:08:15 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 international standa
4、rds. 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 Licensee=IHS Employe
5、es/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 10:08:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ANSI S12.Wl-1999 IS0 3743-1:1994 AMERICAN NATIONAL STANDARD Acoustics- Determination of sound power levels of noise sources-Engineering methods for small, mo
6、vable sources in reverberant fields- Part 1 : Comparison method for hard-walled test rooms (A Nationally Adopted International Standard) Secretariat Acoustical Society of America (ASA) Approved 18 October 1999 American National Standards Institute, Inc. (ANSI) Abstract IS0 3743 is one of the IS0 374
7、0 series, which specifies various methods for determining the sound power levels of machines, equipment and their sub-assemblies. These basic standards specify the acoustical requirements for measurements appropriate for different test environments as shown in table 0.1. When selecting one of the me
8、thods of the IS0 3740 series, it is necessary to select the most appropriate for the conditions and purposes of the noise test. General guidelines to assist in the selection are provided in IS0 3740. The IS0 3740 series gives only general principles regarding the operating and mounting conditions of
9、 the machine or equipment under test. Reference should be made to the noise test code for a specific type of machine or equipment, if available, for specifications on mounting and operating conditions. Copyright Acoustical Society of America Provided by IHS under license with ASA Licensee=IHS Employ
10、ees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 10:08:15 MDTNo reproduction or networking permitted without license from IHS -,-,- AMERICAN NATIONAL STANDARDS ON ACOUSTICS The Acoustical Society of America (ASA) provides the Secretariat for Accredited Standards Cornmittees S1 on Acousti
11、cs, S2 on Mechanical Vibration and Shock, S3 on Bioacoustics, and S12 on Noise. These committees have wide represen- tation from the technical community (manufacturers, consumers, and general- interest representatives). The standards are published by the Acoustical Society of America through the Ame
12、rican Institute of Physics as American National Stan- dards after approval by their respective standards committees and the American National Standards Institute. These standards are developed and published as a public service to provide standards useful to the public, industry, and consumers, and t
13、o Federal, State, and local governments. Each of the Accredited Standards Committees operating in accordance with pro- cedures approved by American National Standards Institute (ANSI) is responsible for developing, voting upon, and maintaining or revising its own standards. The ASA Standards Secreta
14、riat 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 Committees, and approved as American National Standards by ANSI, the ASA Standards Secretaria
15、t arranges for their publication and distribution. An American National Standard implies a consensus of those substantially con- cerned with its scope and provisions. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by direc
16、tly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consen- sus requires that all views and objections be considered and that a concerted effort be made towards their resolution. The use of American National Standards is
17、 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 procedures not conforming to the standards. NOTICE: This American National Standard may be
18、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. Standards Secretariat Acoustical Society of America 120 Wall Street, 32nd Floor New York, New York 10005-3993 USA Te
19、lephone: +1 212 248 0373 Telefax: + 1 21 2 248 O 1 46 E-mail: asastds aip.org O 1999 by the Acoustical Society of America. This Standard may not be reproduced in whole or in pari in any form for sale, promotion, or any commercial purpose, or any purpose not falling within the provisions of the Copyr
20、ight 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. These materials are subject to copyright claims of ISO, IEC, ANSI, and ASA. No part of this publication may be reproduced in any f
21、orm, including an electronic retrieval system, without the prior written pertr)ission of the Acoustical Society of America (ASA). All requests per- taining to this standard should be submitted to the Acoustical Society of America (ASA). Copyright Acoustical Society of America Provided by IHS under l
22、icense with ASA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 04/18/2007 10:08:15 MDTNo reproduction or networking permitted without license from IHS -,-,- Contents Page Foreword . Introduction . 1 Scope . 2 Normative references 3 Definitions 4 Requirements for hard-wailed tes
23、t room 5 Instrumentation . 6 Installation and operation of source under test 7 Measurements in test room . 8 Calculation of sound power levels . 9 Information to be recorded . 10 Information to be reported Annex A Bibliography . Tables 0.1 International Standards specifying various methods for deter
24、mining the sound power levels of machines and equipment 1 Estimated values of the standard deviation of reproducibility of sound power levels determined in accordance with this part of IS0 3743 . 2 Acceptable and unacceptable rooms 3 Required number of source locations . 4 A-weighting values, Ai i 1
25、 2 3 4 5 5 6 8 8 9 V 10 vi i 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 10:08:15 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword This Foreword is not
26、 part of the Nationally Adopted International Standard (NAIS), Acoustics -Determination of sound power levels of noise sources - Engineering methods for small, movable sources in reverberant fields -Part 7: Comparison method for hard- walled test rooms, ANSI S12.5311-1999, IS0 3743-1:1994. This Nati
27、onally Adopted International Standard (NAIS) comprises a pari of a group of definitions, standards, and specifications for use in acoustical work. It has been adopted by the American National Standards Institute utilizing the Accredited Standards Committee Procedure, under the Secretariat of the Aco
28、ustical Society of America. Accredited Standards Committee S12, Noise, under whose jurisdiction this NAIS Standard was adopted, has the following scope: Standards, specifications, and terminology in the field of acoustical noise pertaining to methods of measurement, evaluation, and control; includin
29、g biological safety, tolerance and comfort, and physical acoustics as related to environmental and occupational noise. This standard is in harmony with International Standard IS0 3743-1 :1994, Acoustics-Determination of sound power levels of noise sources-Engineering methods for small, movable sourc
30、es in reverberant fields-Pari 7 : Comparison method for hard-walled test rooms, which was developed by Working Group 28 of Technical Committee 43/Subcommittee 1 of the International Organization for Standardization (ISOflC 43/SC 1MIG 28). At the time this NAIS Standard was submitted to Accredited St
31、andards Committee S12, Noise, for final approval, the membership was as follows: P. D. Schomer, Chair R. D. Hellweg, Vice Chair A. Brenig, Secretary Abbott Laboratories. D. Walton B. Muto (Alt.) Acoustical Society of America . B. M. Brooks W. J. Galloway (Alt.) Acoustical Systems, Inc. R. Goodwin R.
32、 Seitz (Alt.) Air Conditioning FAX: + 1 21 2 248 O1 46. iv 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 10:08:15 MDTNo reproduction or networking permitted without license from IHS -,-,-
33、 IS0 3743-1:1994(E) Introduction 0.1 IS0 3743 is one of the IS0 3740 series, which specifies various methods for determining the sound power levels of machines, equipment and their subassemblies. These basic standards specify the acoustical requirements for measurements appropriate for different tes
34、t environ- ments as shown in tableO.l. When selecting one of the methods of the IS0 3740 series, it is necessary to select the most appropriate for the conditions and purposes of the noise test. General guidelines to assist in the selection are provided in IS0 3740. The IS0 3740 series gives only ge
35、neral principles regarding the operating and mounting conditions of the machine or equipment under test. Reference should be made to the noise test code for a specific type of machine or equipment, if available, for specifications on mounting and operating conditions. 0.2 The method given in this pa
36、rt of IS0 3743 enables measurement of sound pressure levels in octave bands at prescribed fixed microphone positions or along prescribed paths. A comparison method is used which allows determination of sound power levels in octave bands; A-weighted sound power levels may be calculated from the octav
37、e-band sound power levels. Quantities which cannot be determined are the directivity charac- teristics of the source and the temporal pattern of noise radiated by sources emitting non-steady noise. 0.3 Parts 1 and 2 of IS0 3743 specify engineering methods for deter- mining the A-weighted and octave-
38、band sound power levels of small noise sources. The methods are applicable to small machines, devices, compo- nents and sub-assemblies which can be installed in a hard-walled test room with prescribed acoustical characteristics or in a special reverber- ation test room. The methods are particularly
39、suitable for small items of portable equipment; they are not intended for larger pieces of stationary equipment which, due to their manner of operation or installation, cannot readily be moved into the test room and operated as in normal usage. The procedures are intended to be used when an engineer
40、ing grade of accu- racy is desired without requiring the use of laboratory facilities. V 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 10:08:15 MDTNo reproduction or networking permitted
41、without license from IHS -,-,- IS0 3743-1:1994() Table 0.1 - International Standards specifying various methods for determining the sound power levels of machines and equipment vi Copyright Acoustical Society of America Provided by IHS under license with ASA Licensee=IHS Employees/1111111001, User=W
42、ing, Bernie Not for Resale, 04/18/2007 10:08:15 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 3743-1:1994(E) 0 . 4 In IS0 3743-2, the comparison method can also be used, but an al- ternative method permits the determination of the A-weighted sound power level of the s
43、ource under test from a single A-weighted sound pressure level measurement at each microphone position, rather than from a summation of octave-band levels. This direct method eliminates the need for a reference sound source, but requires the use of a special reverberation test room. The direct metho
44、d is based on the premise that the sound pressure level, averaged in space and time in the test room, can be used to determine the sound power level emitted by the source. The properties of the special reverberation test room are chosen so that the rooms influence on the sound power output of the eq
45、uipment under test is small. The number of microphone positions and source locations re- quired in the test room are specified. The requirements to be fulfilled by the special reverberation test room for measurements in accordance with the method given in IS0 3743-2 are significantly more restrictiv
46、e than those placed on the hard-walled test room by the comparison method given in this part of IS0 3743. 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 10:08:15 MDTNo reproduction or netw
47、orking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 3743-1:1994() Acoustics - Determination of sound power levels of noise sources - Engineering methods for small, movable sources in reverberant fields - Part 1: Comparison method for hard-walled test rooms 1 Scope 1.1 General
48、This part of IS0 3743 specifies a relatively simple engi- neering method for determining the sound power levels of small, movable noise sources. The measurements are carried out when the source is installed in a hard-walled test room. A comparison method is used to determine the octave-band sound power levels of the source. The spatial average (octave-band) sound pressure levels produced by the source under test are compared to the spatial average (octave-band) sound pressure levels