1、 ANSI/ASA S12.58-2012 AMERICAN NATIONAL STANDARD Sound Power Level Determination for Sources Using a Single-source Position Accredited Standards Committee S12, Noise Standards Secretariat Acoustical Society of America 35 Pinelawn Road, Suite 114E Melville, NY 11747-3177ANSI/ASAS12.58-2012 The Americ
2、an 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 standards. The Acoustical Society of America (ASA) is an organization of scientists and engineers formed in 19
3、29 to increase and diffuse the knowledge of acoustics and to promote its practical applications. ANSI/ASA S12.58-2012 AMERICAN NATIONAL STANDARD Sound Power Level Determination for Sources Using a Single-source Position Secretariat: Acoustical Society of America Approved by ANSI on: August 23, 2012
4、Abstract This American National Standard describes a method for the determination of sound power levels of noise sources that emit broadband sound and/or discrete frequency sounds/tones using reverberation rooms. The standard applies when it is either undesirable or unfeasible to move the source to
5、decrease the uncertainty of the measurement. The method described requires reverberation room pre-qualification through test and requires the use of the comparison method to determine sound power levels. This standard specifies the physical environment, procedures, and equipment used to qualify the
6、reverberation room by test. Pre-qualifying the room ensures adequate modal density for the use of one source location to obtain acceptable accuracy and repeatability of results. The reference sound source (RSS) used for the comparison method relies on AHRI Standard 250 to accurately describe the req
7、uirements for and characterize sound power of the RSS at all frequencies of interest. AMERICAN NATIONAL STANDARDS ON NOISE The Acoustical Society of America (ASA) provides the Secretariat for Accredited Standards Committees S1 on Acoustics, S2 on Mechanical Vibration and Shock, S3 on Bioacoustics, S
8、3/SC 1 on Animal Bioacoustics, and S12 on Noise. These committees have wide representation from the technical community (manufacturers, consumers, trade associations, organizations with a general interest, and government representatives). The standards are published by the Acoustical Society of Amer
9、ica as American National Standards after approval by their respective Standards Committees and the American National Standards Institute (ANSI). These standards are developed and published as a public service to provide standards useful to the public, industry, and consumers, and to Federal, State,
10、and local governments. Each of the Accredited Standards Committees (operating in accordance with procedures approved by ANSI) is responsible for developing, voting upon, and maintaining or revising its own Standards. The ASA Standards Secretariat administers Committee organization and activity and p
11、rovides 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 Secretariat arranges for their publication and distribution. An Amer
12、ican National Standard implies a consensus of those substantially concerned 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 directly and materially affected interests. Substantial agreement
13、 means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered and that a concerted effort be made towards their resolution. The use of an American National Standard is completely voluntary. Their existence does not in any respe
14、ct 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 revised or withdrawn at any time. The procedures of the Amer
15、ican National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this Standard. Acoustical Society of America 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.or
16、g 2012 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, or any purpose not falling within the provisions of the U.S. Copyright Act of 1976, without prior written permission of the publisher. For perm
17、ission, address a request to the Standards Secretariat of the Acoustical Society of America. 2012 Acoustical Society of America All rights reserved iContents 1 Scope . 1 2 Normative references . 2 3 Terms and definitions . 2 4 Requirements for qualification of reverberation rooms 3 4.1 Reverberation
18、 room requirements 3 4.2 Instrumentation requirements . 4 4.3 Standard deviation requirements for broadband room qualification . 4 4.4 Standard deviation requirements for discrete-frequency room qualification . 4 4.5 Microphone position 5 4.6 Microphone traverse . 5 4.7 Fixed microphones 6 5 Reverbe
19、ration room qualification procedures 6 5.1 Introduction 6 5.2 Broadband room qualification . 6 5.3 Discrete frequency room qualification . 8 6 Sound power testing requirements and calculations . 11 6.1 Instrumentation 11 6.2 Volume of unit under test 11 6.3 Location of unit under test . 11 6.4 Refer
20、ence sound source considerations . 11 6.5 Measurements . 11 6.6 One-third octave band sound power level calculation 11 6.7 Octave band sound power level calculations 13 6.8 A-weighted sound power level 14 6.9 Linear sound power level 14 7 Information to be recorded . 15 7.1 General 15 7.2 Noise sour
21、ce under test 15 7.3 Test environment 15 7.4 Instrumentation 16 7.5 Acoustical data 16 8 Test report 16 9 Conformance conditions 16 Annex A (informative) Sample calculation . 17 Tables Table 1 Maximum standard deviations of sound power level reproducibility determined in accordance with this standar
22、d . 1 Table 2Broadband standard deviation limits . 4 2012 Acoustical Society of America All rights reserved iiTable 3Discrete frequency standard deviation limits . 4 Table 4 Test frequencies for discrete frequency qualification 9 Table 5 One-third octave band frequency range ANSI/ASA S1.6-1984 (R 20
23、11) . 10 Table 6 Background correction limits by one-third octave band 13 Table 7 One-third octave band numbers and A-weighting factors . 14 2012 Acoustical Society of America All rights reserved iiiForeword This Foreword is for information only and is not a part of the American National Standard AN
24、SI/ASA S12.58-2012 American National Standard Sound Power Level Determination for Sources Using a Single-source Position. This standard comprises a part of a group of definitions, standards, and specifications for use in noise. It was developed and approved by Accredited Standards Committee S12 Nois
25、e, 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 in the field of acoustical noise pertaining to methods of m
26、easurement, evaluation, and control, including biological safety, tolerance and comfort, and physical acoustics as related to environmental and occupational noise. This standard was developed from the Air-Conditioning, Heating and Refrigeration Institutes (AHRI) standard AHRI 220. It is published he
27、re with permission from AHRI after being approved by ballot in Accredited Standards Committee S12. This standard is not comparable to any existing ISO Standard. At the time this Standard was submitted to Accredited Standards Committee S12, Noise for approval, the membership was as follows: W.J. Murp
28、hy, Chair R.D. Hellweg, Vice-Chair S.B. Blaeser, Secretary 3M Occupational Health Fax: 631-390-0217; E-mail: asastdsaip.org. 2012 Acoustical Society of America All rights reserved vi Introduction This standard describes a method for determination of sound power levels of broadband and/or discrete-fr
29、equency noise, and narrowband noise sources in reverberation rooms. It is based on but more restrictive than ANSI/ASA S12.51/ISO 3741, which allows the user to test using either the direct method or the comparison method and also allows the user to employ a space with general characteristics. The in
30、tent of ANSI/ASA S12.51/ISO 3741 is to have a room that provides a “good” environment for testing, with the understanding that if the end result has a variation that is too high, the user can increase the number of measurement locations to improve the spatial averaging and thus lower the variation.
31、This is not practical for sources that are difficult to move. The method described herein requires reverberation room pre-qualification through test and requires the use of the comparison method to determine sound power levels. This Standard specifies the physical environment, procedures, and equipm
32、ent to qualify the reverberation room by test. Pre-qualifying the room ensures adequate modal density for the use of one source location to obtain acceptable accuracy and repeatability of results. The reference sound source (RSS) used for the comparison method relies on AHRI Standard 250 to accurate
33、ly determine the sound power for the RSS at all frequencies of interest. The use of the comparison method reduces a number of potential sources of data collection and calculation errors. The standard contains information on instrumentation, installation, and operation of the source, procedures for d
34、etermining the number of microphone positions or length of traverse, and procedures for the calculation of sound power levels. AMERICAN NATIONAL STANDARD ANSI/ASA S12.58-2012 2012 Acoustical Society of America All rights reserved 1American National Standard Sound Power Level Determination for Source
35、s Using a Single-source Position 1 Scope This American National Standard describes a method for the determination of sound power levels of noise sources that emit broadband sound and/or discrete frequency sounds/tones in reverberation rooms. The method described herein requires reverberation room pr
36、e-qualification through test and requires the use of the comparison method to determine sound power levels. This standard specifies the physical environment, procedures, and equipment used to qualify the reverberation room by test. Pre-qualifying the room ensures adequate modal density for the use o
37、f one source location to obtain acceptable accuracy and repeatability of results. The reference sound source (RSS) used for the comparison method relies on AHRI Standard 250 to accurately describe the performance and characterize the sound power of the RSS at all frequencies of interest. Sound ratin
38、g values are often useful for applications and design; therefore, it is important to acquire data and qualify measurement rooms in one-third octave bands. The use of the comparison method reduces a number of potential sources of error. This standard contains information on instrumentation, installat
39、ion, and operation of the source; procedures for determining the number of microphone positions or length of traverse; and procedures for the calculation of sound power level. Measurements made in conformity with this standard will, with very few exceptions, result in standard deviations equal to or
40、 less than specified in Table 1. The frequencies covered in this standard range from the 50 Hz to the 10,000 Hz one-third octave bands (63 Hz to 8000 Hz octave bands). The 50 to 80 Hz one-third octave band sound frequently affects product applications and often cannot be ignored. The product-specifi
41、c standards referring to this method should specify the frequency range of interest for qualification, calculation, and reporting. This standard is based on ANSI/ASA S12.51/ISO 3741 but provides additions, exceptions, and extensions. Table 1 Maximum standard deviations of sound power level reproduci
42、bility determined in accordance with this standard One-third octave band center frequency, Hz One-third octave band maximum standard deviation of reproducibility, R0, dB 50 - 80 4.0 100 - 160 3.0 200 - 315 2.0 400 - 5000 1.5 6000 - 10000 3.0 A-weighted 1.0 This standard is intended to serve as a bas
43、ic reference to be used in product-specific standards and for the guidance of the industry, including manufacturers, engineers, installers, contractors, and users. The standard is appropriate for all noise sources but is especially appropriate when it is either undesirable or unfeasible to move the
44、source to decrease the uncertainty of the measurement. This standard applies to products where sound power is determined by measurement using the comparison method in a reverberation room that meets the qualification requirements of this standard. ANSI/ASA S12.58-2012 2012 Acoustical Society of Amer
45、ica All rights reserved 22 Normative references The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. A
46、NSI S1.4-1983 (R 2006) American National Standard Specification for Sound Level Meters. ANSI/ASA S1.6-1984 (R 2011) American National Standard Preferred Frequencies, Frequency Levels, and Band Numbers for Acoustical Measurements. ANSI/ASA S1.11-2004 (R 2009), Specification for Octave-Band and Fracti
47、onal-Octave-Band Analog and Digital Filters. ANSI/ASA S12.51-2002/ISO 3741:1999 (R 2007), American National Standard Acoustics Determination of sound power levels of noise sources using sound pressure Precision methods for reverberation test rooms (a nationally adopted international standard) AHRI S
48、tandard 250-2008, Performance and Calibration of Reference Sound Sources, 2008, Air-Conditioning, Heating, and Refrigeration Institute, 2111 Wilson Boulevard, Suite 500, Arlington, VA 22201, U.S.A. ASHRAE Terminology of Heating, Ventilation, Air-Conditioning and Refrigeration, Second Edition, 1991,
49、American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 1791 Tullie Circle, N.E. Atlanta, GA 30329, U.S.A. 3 Terms and definitions For the purposes of this standard, the terms and definitions given in the ASHRAE Terminology of Heating, Ventilation, Air-Conditioning and Refrigeration and the following apply: 3.1 broadband sound sound that is random in nature with frequency components distributed over a broad frequency range NOTE Typically pure tones or periodic disturbances will not be distinguishable in this type o
