ASA S12 11 PART 1-2013 AMERICAN NATIONAL STANDARD Acoustics C Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devices C Part 1 Airbo.pdf

1、 ANSI/ASA S12.11-2013/Part 1 / ISO 10302-1:2011 AMERICAN NATIONAL STANDARD Acoustics Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devices Part 1: Airborne noise measurement (a nationally adopted international standard) Accredited Standards Committee

2、 S12, Noise Standards Secretariat Acoustical Society of America 35 Pinelawn Road, Suite 114 E Melville, NY 11747-3177ANSI/ASA S12.11-2013/Part 1 /ISO 10302-1:2011 The American National Standards Institute, Inc. (ANSI) is the national coordinator of voluntary standards development and the clearinghou

3、se 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 and to promote its practical applications. ANSI/ASA S12.112013/Part 1 / I

4、SO 103021:2011 (Revision of ANSI/ASA S12.112003/Part 1 / ISO 10302:1996 (MOD) (R 2008) AMERICAN NATIONAL STANDARD Acoustics Measurement of airborne noise emitted and structureborne vibration induced by small airmoving devices Part 1: Airborne noise measurement (a nationally adopted international sta

5、ndard) Secretariat: Acoustical Society of America Approved on April 2, 2013 by: American National Standards Institute, Inc. Abstract ANSI/ASA S12.112013/Part 1 / ISO 103021:2011 specifies methods for measuring the airborne noise emitted by small airmoving devices (AMDs), such as those used for cooli

6、ng electronic, electrical, and mechanical equipment where the sound power level of the AMD is of interest. Examples of these AMDs include propeller fans, tubeaxial fans, vaneaxial fans, centrifugal fans, motorized impellers, and their variations. This part of this American National Standard describe

7、s the test apparatus and methods for determining the airborne noise emitted by small AMDs as a function of the volume flow rate and the fan static pressure developed by the AMD on the test apparatus. It is intended for use by AMD manufacturers, by manufacturers who use AMDs for cooling electronic eq

8、uipment and similar applications, and by testing laboratories. It provides a method for AMD manufacturers, equipment manufacturers and testing laboratories to obtain comparable results. Results of measurements made in accordance with this part of this American National Standard are expected to be us

9、ed for engineering information and performance verification, and the methods can be cited in purchase specifications and contracts between buyers and sellers. The ultimate purpose of the measurements is to provide data to assist the designers of electronic, electrical or mechanical equipment which c

10、ontains one or more AMDs. Based on experimental data, a method is given for calculating the maximum volume flow rate of the scaled plenum up to which this part of this American National Standard is applicable. AMERICAN NATIONAL STANDARDS ON ACOUSTICS The Acoustical Society of America (ASA) provides

11、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 associations, organ

12、izations 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 standards are develop

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18、ng 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 Standards Secretar

19、iat 35 Pinelawn Road, Suite 114E Melville, New York 117473177 Telephone: 1 (631) 3900215 Fax: 1 (631) 3900217 Email: asastdsaip.org 2013 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 purpos

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22、rica All rights reserved iContents 1 Scope . 1 2 Normative references . 1 3 Terms and definitions . 2 3.1 General definitions 2 3.2 Acoustical definitions . 3 3.3 Aerodynamic definitions . 3 4 Limitations of measurement 5 5 Design and performance requirements for test plenum . 6 5.1 General 6 5.2 Te

23、st plenum: main assembly . 6 5.3 Mounting panel assembly . 7 5.4 Adjustable exit port assembly 7 5.5 Insertion loss of test plenum . 8 5.6 Instrumentation for static pressure measurement . 8 6 Installation . 8 6.1 Installation of test plenum in test room . 8 6.2 Direction of airflow . 9 6.3 Mounting

24、 of airmoving device 9 7 Operation of airmoving device 9 7.1 Input power 9 7.2 Points of operation (AC and DC airmoving devices) 10 8 Measurement procedures 11 8.1 General . 11 8.2 Microphone positions for measurements in an essentially free field over a reflecting plane 11 8.3 Preparations for meas

25、urements . 12 8.4 Operational test of airmoving device 12 9 Measurement uncertainty 13 10 Information to be recorded 14 11 Information to be reported . 14 Annex A (normative) Microfan pq curve measurement method 26 A.1 Scope . 26 Annex B (informative) Effects of air density 28 Annex C (informative)

26、Data formats for presentation . 29 C.1 General . 29 C.2 Example . 29 Annex D (informative) Airmoving device acoustical noise specification 33 D.1 General . 33 2013 Acoustical Society of America All rights reserved iiD.2 Specification formats for a single airmoving device 33 D.3 Specification formats

27、 for a lot of airmoving devices 33 Annex E (informative) Guidance on the development of information on measurement uncertainty 34 E.1 General . 34 E.2 Model function 34 E.3 Input quantities and their contributions to measurement uncertainty . 36 E.4 Uncertainty budget . 39 E.5 Combined standard unce

28、rtainty and expanded uncertainty . 40 Tables Table 1 Estimated values of the standard deviation of reproducibility of sound power levels of airmoving devices determined in accordance with this part of this American National Standard . 13 Table 2 Coordinates of hemispherical measurement surface for s

29、ources emitting discrete tones (10 measurement heights) 24 Table D.1 Example of an uncert ainty budget for determination of sound power 40 Figures Figure 1 Test pl enum (full size) . 16 Figure 2 Test plenum F ilm attachment detail 17 Figure 3 Test plenum Gusse t and vibration isolation . 17 Figure 4

30、 Test plenum Pressure ring . 18 Figure 5 Mounting panel assembly . 19 Figure 6 Adjustable exit port assembly 20 Figure 7 Adjustable exit port assembly Aperture plate (stai nless steel) . 21 Figure 8 Adjustable exit port assembly Slide r (stainless steel) . 22 Figure 9 Schematic correlation between p

31、q curve versus system impedance curves (not to scale) . 23 Figure 10 Hemispherical surf ace 10 measurement points . . 24 Figure 11 Coaxial circular five or more paths in parallel pla nes for microphone traverses in a free field over a reflecting plane 25 Figure 12 Schematic correlation of applicabil

32、ity of this annex and corresponding noise emissions (not to scale) . 27 2013 Acoustical Society of America All rights reserved iiiForeword This Foreword is for information only, and is not a part of the American National Standard ANSI/ASA S12.112013 Part 1/ISO 103021:2011 American National Standard

33、Acoustics Measurement of airborne noise emitted and structureborne vibration induced by small airmoving devices Part 1: Airborne noise measurement. As such, this Foreword may contain material that has not been subjected to public review or a consensus process. In addition, it does not contain requir

34、ements necessary for conformance to the standard. 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 Noise, under its approved operating procedures. Those procedures have been a

35、ccredited 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 measurement, evaluation, and control, including biological safety, tolera

36、nce, and comfort, and physical acoustics as related to environmental and occupational noise. This standard is an identical national adoption of ISO 103021:2011. It revises and replaces ANSI/ASA S12.112003/Part 1 / ISO 10302:1996 (MOD) (R 2008) American National Standard Acoustics Measurement of nois

37、e and vibration of small airmoving devices Part 1: Airborne noise emission, which was a Modified Nationally Adopted International Standard. ISO 103021:2011 was prepared by Technical Committee ISO/TC 43 Subcommittee SC 1, Noise. In conformance with ANSI and ISO rules, the words “this part of this Ame

38、rican National Standard“ replace the words “this part of ISO 10302“ where they appear in the 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/ASA equivalents for so

39、me of the ISO standards referenced in this standard are given below: ANSI/ASA S12.51/ISO 3741 is an identical national adoption of ISO 3741; ANSI/ASA S12.54/ISO 3744 is an identical national adoption of ISO 3744; and ANSI/ASA S12.55/ISO 3745 is an identical national adoption of ISO 3745. At time of

40、publication, BSR/ASA S12.11201x/Part 2 / ISO 103022:2011 is expected to be approved as the identical national adoption of ISO 103022:2011. ANSI/ASA S12.102010/Part 1 is essentially identical to ISO 7779:2010 as they are both adoptions of 10thEdition of ECMA74 (2008). At the time this Standard was su

41、bmitted to Accredited Standards Committee S12, Noise for approval, the membership was as follows: W.J. Murphy, Chair S.J. Lind, ViceChair S.B. Blaeser, Secretary 3M Occupational Health FAX: 6313900217; Email: asastdsaip.org. 2013 Acoustical Society of America All rights reserved viiIntroduction This

42、 part of this American National Standard specifies in detail methods for determining and reporting the airborne noise emissions of small airmoving devices (AMDs) used primarily for cooling electronic equipment, such as that for information technology and telecommunications. To provide compatibility

43、with measurements of acoustical noise emitted by such equipment, this part of this American National Standard uses the noise emission descriptors and sound power measurement methods of ISO 7779. The descriptor of overall airborne noise emission of the AMD under test is the Aweighted sound power leve

44、l. The onethirdoctaveband sound power level is the detailed descriptor of the noise emission. Octaveband sound power levels may be provided in addition to the onethirdoctaveband sound power levels. AMERICAN NATIONAL STANDARD ANSI/ASA S12.112013 Part 1 / ISO 103021:2011 2013 Acoustical Society of Ame

45、rica All rights reserved 1American National Standard Acoustics Measurement of airborne noise emitted and structureborne vibration induced by small airmoving devices Part 1: Airborne noise measurement (a nationally adopted international standard) 1 Scope This part of this American National Standard s

46、pecifies methods for measuring the airborne noise emitted by small airmoving devices (AMDs), such as those used for cooling electronic, electrical, and mechanical equipment where the sound power level of the AMD is of interest. Examples of these AMDs include propeller fans, tubeaxial fans, vaneaxial

47、 fans, centrifugal fans, motorized impellers, and their variations. This part of this American National Standard describes the test apparatus and methods for determining the airborne noise emitted by small AMDs as a function of the volume flow rate and the fan static pressure developed by the AMD on

48、 the test apparatus. It is intended for use by AMD manufacturers, by manufacturers who use AMDs for cooling electronic equipment and similar applications, and by testing laboratories. It provides a method for AMD manufacturers, equipment manufacturers and testing laboratories to obtain comparable re

49、sults. Results of measurements made in accordance with this part of this American National Standard are expected to be used for engineering information and performance verification, and the methods can be cited in purchase specifications and contracts between buyers and sellers. The ultimate purpose of the measurements is to provide data to assist the designers of electronic, electrical or mechanical equipment which contains one or more AMDs.