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1、 ANSI S12.11-2003/Part 1 ISO 10302:1996 (MOD) AMERICAN NATIONAL STANDARD Acoustics Measurement of noise and vibration of small air-moving devices, Part 1: Airborne noise emission (A Nationally Adopted International Standard) Accredited Standards Committee S12, Noise Standards Secretariat Acoustical
2、Society of America 35 Pinelawn Road, Suite 114E Melville, New York 11747-3177 ANSI S12.11-2003/Part 1 ISO 10302: 1996 (MOD) The American National Standards Institute, Inc. (ANSI) is the national coordinator of voluntary standards development and the clearinghouse in the U.S. for information on natio
3、nal 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 S12.11- 2003/ Part 1 ISO 10302:1996 (MOD) AMERICAN NATIONAL
4、STANDARD Acoustics Measurement of noise and vibration of small air-moving devices, Part 1: Airborne noise emission Nationally Adopted International Standard Secretariat Acoustical Society of America Approved August 7, 2003 American National Standards Institute, Inc. Abstract This Nationally Adopted
5、International Standard specifies in detail a laboratory method for determining and reporting the airborne noise emissions of small air-moving devices used primarily for cooling electronic equipment, such as computer and business equipment. To provide compatibility with measurements of noise emitted
6、by such equipment, this Nationally Adopted International Standard uses the noise emission descriptors and sound power measurement methods of ANSI S12.10- 2002/ISO 7779:1999. The descriptor of overall noise emission of the air-moving device under test is the A-weighted sound power level. The one-thir
7、d-octave-band sound power level is the detailed descriptor of the noise emission. Octave band sound power levels may be provided in addition to the one-third-octave-band sound power levels. ANSI S12.11-2003 Part 2 describes measurement of structure-borne noise generated by air-moving devices. -,-,-
8、4 AMERICAN NATIONAL STANDARDS ON ACOUSTICS 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, and S12 on Noise. These committees have wide representation from the technical co
9、mmunity (manufacturers, consumers, trade associations, 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 Nati
10、onal Standards Institute. These standards 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
11、American National Standards Institute (ANSI) is responsible for developing, 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 S
12、tandards 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 American National Standard implies a consensus of those substantially concerned with
13、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 m eans much more than a simple majority, but not necessarily unanimity. Consensu
14、s 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 respect preclude anyone, whether he or she has approved the Standards or not, from ma
15、nufacturing, 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 American National Standards Institute require that action be taken periodically to r
16、eaffirm, 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.org 2003 by Acoustical Society of America. This standard may not be reproduced in
17、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 permission, address a request to the Standards Secretariat of the Acoustical Society
18、 of America. -,-,- i Contents 1 Scope 1 2 Normative references2 3 Terms and definitions2 4 Measurement uncertainty4 5 Design and performance requirements for test plenum4 5.1 General .4 5.2 Test plenum: main assembly.5 5.3 Mounting panel assembly .6 5.4 Adjustable exit port assembly6 5.5 Insertion l
19、oss of test plenum6 5.6 Instrumentation 7 6 Installation7 6.1 Installation of test plenum in test room.7 6.2 Direction of airflow7 6.3 Mounting of air-moving device.7 7 Operation of air-moving device8 7.1 Input power8 7.2 Points of operation (AC and DC air-moving devices).8 8 Measurement procedure .
20、9 8.1 Microphone positions for measurements in essentially a free field over a reflecting plane 10 8.2 Preparations for measurements 10 8.3 Operational test of air-moving device. 10 9 Information to be recorded. 11 10 Information to be reported 12 Annex A (normative) Effects of air density. 20 Annex
21、 B (normative) Data formats for presentation 21 Annex C (informative) Air-moving device noise specification. 25 Bibliography 26 Tables Table 1 Estimated values of the standard deviation of reproducibility of sound power levels of air- moving devices determined in accordance with this Standard4 Table
22、 2 Coordinates of measurement positions on a 2.0-m radius hemisphere when testing the air- moving device with the test plenum box . 19 -,-,- ii Figures Figure 1 Test plenum .13 Figure 2 Test plenum-Film attachment detail13 Figure 3 Test plenum-Gusset and vibration isolation.14 Figure 4 Test plenum P
23、iezometer pressure ring.15 Figure 5 Mounting panel assembly16 Figure 6 Adjustable exit port assembly 17 Figure 7 Adjustable exit port assembly-Aperture plate 17 Figure 8 Adjustable exit port assembly-Slider.18 Figure 9 Hemispherical surface-10 measurement points.19 iii Foreword This foreword is not
24、part of ANSI S12.11-2003 Part 1/ ISO 10302: 1996 (MOD) American National Standard Acoustics - Measurement of noise and vibration of small air-moving devices Part 1: Airborne noise emission. This modified Nationally Adopted International Standard (NAIS) comprises a part of a group of definitions, sta
25、ndards, and specifications for use in noise. It was 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:
26、 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 and occupational noise. This Standard is a modified vers
27、ion of International Standard ISO 10302: 1996, Acoustics - Method for the measurement of airborne noise emitted by small air-moving devices, which was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise, and ISO/TC 117, Industrial fans. At the time this NAIS Standard was s
28、ubmitted to Accredited Standards Committee S12, Noise, for final approval, the membership was as follows: R.D. Hellweg, Chair R.D. Godfrey, Vice-Chair S.B. Blaeser, Secretary Acoustical Society of AmericaB.M. Brooks .P.D. Schomer (Alt.) Aearo CompanyE.H. Berger Air-Conditioning and Refrigeration Ins
29、titute.R. Seel .M. Darbeau (Alt.) Alcoa, Inc.W.D. Gallagher American Industrial Hygiene Association.D. Driscoll .J. Banach (Alt.) American Speech-Hearing-Language Association.G. Linn .R. Levinson (Alt.) Audio Engineering Society, IncM.R. Chial Bruel therefore, the results of measurements made in acc
30、ordance with this Standard may differ from the results obtained when air-moving devices are installed in equipment. NOTE 1 This Standard does not describe measurement of the structure-borne noise generated by air-moving devices, and it does not cover measurement of the aerodynamic performance of suc
31、h devices. -,-,- ANSI S12.11-2003/ Part 1 2 2 Normative references The following Standards contain provisions which, through reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to r
32、evision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. ANSI S2.32-1982 (R 2001), American National Standard Methods for the Experimental Determination of Mechanic
33、al Mobility, Part II: Measurements Using Single-Point Translational Excitation. IS0 266:1997, Acoustics-Preferred frequencies. IS0 3741: 1999, Acoustics- Determination of sound power levels of noise sources using sound pressure -Precision methods for reverberation rooms. IS0 3744: 1994, Acoustics- D
34、etermination of sound power levels of noise sources using sound pressure -Engineering method in an essentially free field over a reflecting plane. IS0 3745:1977, Acoustics- Determination of sound power levels of noise sources - Precision methods for anechoic and semi-anechoic rooms. IS0 7779:1999, A
35、coustics- Measurement of airborne noise emitted by information technology and telecommunications equipment. IS0 5801:1997, Industrial fans - Performance testing using standardized airways. 3 Terms and definitions For the purposes of this standard, the following definitions apply. 3.1 sound power lev
36、el. Lw Ten times the logarithm to the base 10 of the ratio of a given sound power to the reference sound power. It is expressed in decibels. The reference sound power is 1 pW (=10-12 W). The frequency weighting or the width of the frequency band used shall be indicated, for example the A- weighted s
37、ound power level, octave band sound power level, one-third-octave-band sound power level, etc. NOTE 2 IS0 9296 requires that the declared values of the A -weighted sound power levels of computer and business equipment be expressed in bels (B), using the identity 1 B = 10 dB. This requirement applies
38、 primarily to equipment and functional units thereof which are used in offices and office-like environments and in computer installations, rather than to the constituent components of such equipment. Some manufacturers have also found it convenient to express the A -weighted sound power levels of de
39、vices, components and subassemblies, including small air-moving devices, in bels. 3.2 air-moving device. A device for moving air which utilizes a rotating impeller driven by an electric motor with electronic or mechanical command. NOTE 3 An air-moving device has at least one inlet opening and at lea
40、st one outlet opening. The openings may or may not have elements for connection to ductwork or to other parts of the airflow path. ANSI S12.11-2003/ Part 1 3 NOTE 4 Tests may be run with a particular frame, motor and rotor, but with different accessories (e.g. finger guards purposes of this Standard
41、, each such configuration is referred to as an air-moving device. 3.3 fan. An air-moving device. NOTE 5 Within some industries, including information technology, the unmodified term “fan“ means “axial flow air-moving device,“ and the unmodified term “blower“ means “centrifugal device“. In this Stand
42、ard, the term “fan“ is used to mean “air-moving device“ and does not necessarily imply axial flow. Modifiers (such as axial, centrifugal or mixed-flow) will be added if it is necessary to distinguish between types. This usage is adopted for consistency with IS0 5801. 3.4 test plenum. A structure ont
43、o which the air-moving device under test is mounted for noise emission measurements. NOTE 6 The plenum provides a flow resistance to the air-moving device, but permits sound from the air- moving device to escape with only minimal attenuation. Thus, the sound power radiated by the air-moving device m
44、ay be determined from acoustical measurements made outside the test plenum. 3.5 air-moving device performance curve. The presentation of fan static pressure as a function of volume flow rate under standard air conditions and constant operating voltage and frequency in accordance with IS0 5801. 3.6 p
45、oint of operation. Point on the air-moving device performance curve corresponding to a particular volume flow rate. NOTE 7 The point of operation is controlled during a test by adjusting the “slider“ on the test plenum exit port assembly. 3.7 overall static efficiency of air-moving device. The volum
46、e flow rate multiplied by the fan static pressure and divided by the input electrical power. The expression for overall static efficiency, as a percentage is: where 0 100 P qp vsF os = where os is the overall static efficiency, as a percentage; sF pis the fan static pressure, in pascals; v qis the v
47、olume flow rate, in cubic metres per second; 0 Pis the motor input power, in watts (true power, not including reactive component), supplied at the terminals of the electric drive motor. NOTE 8 The air-moving device is defined to include the motor, impeller and frame; therefore, the overall static ef
48、ficiency includes both the electromechanical efficiency of the motor and the aerodynamic efficiency of the impeller and frame, -,-,- ANSI S12.11-2003/ Part 1 4 3.8 standard air density. Density under standard conditions, 1,201 kg/m3. For the purposes of this Standard, standard conditions are 20C, 50% relative humidity, and 1,013 x 105 Pa barometric pressure. 3.9 frequency range of interest. The range extending from the 100 Hz one-third-octave band to the 10 kHz one-third-octave band, inclusive. The range and center frequencies of these one-third-octave bands are specified