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1、BRITISH STANDARD BS EN ISO 3746:1996 Acoustics Determination of sound power levels of noise sources using sound pressure Survey method using an enveloping measurement surface over a reflecting plane The European Standard EN ISO 3746:1995 has the status of a British Standard ICS 17.140.10 Licensed Co
2、py: sheffieldun sheffieldun, na, Sat Nov 18 02:24:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 3746:1996 This British Standard, having been prepared under the direction of the Health and Environment Sector Board, was published under the authority of the Standards Board and comes into effe
3、ct on 15 November 1996 BSI 10-1998 The following BSI references relate to the work on this standard: Committee reference EH/1 Draft for comment 92/58826 DC ISBN 0 580 26086 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committe
4、e EH/1, Acoustics, upon which the following bodies were represented: Association of Consulting Engineers British Broadcasting Corporation British Occupational Hygiene Society British Telecommunications plc Department of the Environment (Building Research Establishment) Department of Health Departmen
5、t of Trade and Industry (National Physical Laboratory) Health and Safety Executive Institute of Acoustics Institute of Occupational Hygienists Institute of Sound and Vibration Research Institution of Electrical Engineers Royal Institute of British Architects Society of Environmental Engineers The fo
6、llowing bodies were also represented in the drafting of the standard, through subcommittees and panels: Advanced Manufacturing Technology Research Institute Agricultural Engineers Association British Cement Association British Compressed Air Society British Industrial Truck Association British Iron
7、and Steel Producers Association Construction Industry Research and Information Association Department of Trade and Industry (National Engineering Laboratory) Engineering Industries Association Fan Manufacturers Association Federation of the Electronics Industry Federation of Manufacturers of Constru
8、ction Equipment and Cranes Federation of Piling Specialists Hevac Association Institution of Engineering Designers Institution of Mechanical Engineers National Specialist Contractors Council Rotating Electrical Machines Association University of Liverpool University of Manchester Amendments issued s
9、ince publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:24:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 3746:1996 BSI 10-1998i Contents Page Committees responsibleInside front cover National forewordiii Foreword2 Introduction3 1Scope5 2Normative ref
10、erences6 3Definitions7 4Acoustic environment8 5Instrumentation8 6Installation and operation of source under test9 7Measurement of sound pressure levels10 8Calculation of A-weighted surface sound pressure level and A-weighted sound power level14 9Information to be recorded15 10Information to be repor
11、ted16 Annex A (normative) Qualification procedures for the acoustic environment17 Annex B (normative) Microphone array on the hemispherical measurement surface20 Annex C (normative) Microphone array on the parallelepiped measurement surface23 Annex D (informative) Guidelines for the detection of imp
12、ulsive noise27 Annex E (informative) Bibliography28 Figure 1 Examples illustrating reference boxes and characteristic source dimensions d0 with respect to the origin of the coordinate system Q12 Figure A.1 Environmental correction K2A, in decibels18 Figure B.1 Microphone array on the hemisphere Key
13、microphone positions20 Figure B.2 Microphone array on the hemisphere21 Figure B.3 Plan view of a spherical measurement surface and microphone positions around a reference box adjacent to two reflecting planes22 Figure C.1 Procedure for fixing the specified microphone positions where a side of the me
14、asurement surface exceeds 3d23 Figure C.2 Example of a measurement surface and microphone positions for a small machine23 Figure C.3 Example of a measurement surface and microphone positions for a tall machine with a small base area24 Figure C.4 Example of a measurement surface and microphone positi
15、ons for a long machine24 Figure C.5 Example of a measurement surface and microphone positions for a medium-sized machine25 Figure C.6 Example of a measurement surface and microphone positions for a large machine26 Figure C.7 Measurement surface (parallelepiped) with four microphone positions for flo
16、or-standing appliances placed against a wall26 Figure C.8 Measurement surface (parallelepiped) with three microphone positions for floor-standing appliances placed against two walls27 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:24:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO
17、 3746:1996 ii BSI 10-1998 Page Table 0.1 Overview of International Standards for determination of sound power levels of noise sources using enveloping surface methods over a reflecting plane and giving different grades of accuracy4 Table 1 Estimated upper values of the standard deviations of reprodu
18、cibility of A-weighted sound power levels determined in accordance with this International Standard5 Table A.1 Approximate values of the mean sound absorption coefficient 19 Table B.1 Coordinates of key microphone positions (4, 5, 6, 10) and additional microphone positions (14, 15, 16, 20)20 Table B
19、.2 Coordinates of microphone positions (4, 5, 6, 10) for sources emitting discrete tones20 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:24:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 3746:1996 BSI 10-1998iii National foreword This British
20、Standard has been prepared by Technical Committee EH/1 and is the English language version of EN ISO 3746:1995 Acoustics Determination of sound power levels of noise sources using sound pressure Survey method using an enveloping measurement surface over a reflecting plane, published by the European
21、Committee for Standardization (CEN). It is identical with ISO 3746:1995 including Technical Corrigendum 1:1995 published by the International Organization for Standardization (ISO). This British Standard supersedes BS 4196-6:1981 which is withdrawn. A British Standard does not purport to include all
22、 the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorresponding British Standard ISO 354:1985BS EN 20
23、354:1993 Acoustics. Measurement of sound absorption in a reverberation room ISO 3744:1994BS EN ISO 3744:1995 Acoustics. Determination of sound power levels of noise sources using sound pressure. Engineering method in an essentially free field over a reflecting plane BS 4196 Sound power levels of noi
24、se sources ISO 3745:1977Part 5:1981 Precision methods for determination of sound power levels for sources in anechoic and semi-anechoic rooms ISO 3747:1987Part 7:1988 Survey method for determination of sound power levels of noise sources using a reference sound source ISO 6926:1990Part 8:1991 Specif
25、ication for the performance and calibration of reference sound sources BS 6805 Statistical methods for determining and verifying stated noise emission values for machinery and equipment ISO 7574-1:1985Part 1:1987 Glossary of terms ISO 7574-4:1985Part 4:1987 Methods for determining and verifying stat
26、ed values for batches of machines IEC 651:1979BS EN 60651:1994 Specification for sound level meters IEC 804:1985BS EN 60804:1994 Specification for integrating-averaging sound level meters IEC 942:1988BS 7189:1989 Specification for sound calibrators Summary of pages This document comprises a front co
27、ver, an inside front cover, pages i to iv, the EN title page, pages 2 to 28, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sh
28、effieldun sheffieldun, na, Sat Nov 18 02:24:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:24:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3746 August 1995 ICS 17.140.10 Descri
29、ptors: Acoustics, sound sources, noise (sound), engine noise, tests, acoustic tests, determination, sound pressure, sound power, acoustic measurements English version Acoustics Determination of sound power levels of noise sources using sound pressure Survey method using an enveloping measurement sur
30、face over a reflecting plane (ISO 3746:1995) Acoustique Dtermination des niveaux de puissance acoustique mis par les sources de bruit partir de la pression acoustique Mthode de contrle employant une surface de mesure enveloppante au-dessus dun plan rflchissant (ISO 3746:1995) Akustik Bestimmung der
31、Schalleistungspegel von Geruschquellen aus Schalldruckmessungen Hllflchenverfahren der Genauigkeitsklasse ber einer reflektierenden Ebene (ISO 3746:1995) This European Standard was approved by CEN on 1995-05-12. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulat
32、e the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exist
33、s in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodi
34、es of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secre
35、tariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. EN ISO 3746:1995 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:24:56 GMT+00:00 2006, Uncontrolled Copy,
36、(c) BSI EN ISO 3746:1995 2 BSI 10-1998 Foreword The text of the International Standard ISO 3746:1995 has been prepared by Technical Committee ISO/TC 43, Acoustics, in collaboration with CEN/TC 211, Acoustics. This European Standard shall be given the status of a National Standard, either by publicat
37、ion of an identical text or by endorsement, at the latest by February 1996, and conflicting national standards shall be withdrawn at the latest by February 1996. This European Standard has been prepared under a Mandate given to CEN by the Commission of the European Commission and the European Free T
38、rade Association, and supports essential requirements of EC Directive(s). According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Nether
39、lands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:24:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 3746:1995 BSI 10-19983 Introduction 0.1 This International Standard is one of the ISO 3740 series, which speci
40、fies various methods for determining the sound power levels of machines, equipment and their sub-assemblies. When selecting one of the methods of the ISO 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
41、 selection are provided in ISO 3740. The ISO 3740 series gives only general principles regarding the operating and mounting conditions of the machine or equipment under test. Reference should be made to the test code for a specific type of machine or equipment, if available, for specifications on mo
42、unting and operating conditions. 0.2 This International Standard specifies a method for measuring the sound pressure levels on a measurement surface enveloping the source and for calculating the sound power level produced by the source. The enveloping surface method can be used for any of three grad
43、es of accuracy (see Table 0.1), and is used in this International Standard for grade 3 accuracy. The use of this International Standard requires certain qualification criteria to be fulfilled as described in Table 0.1. If the relevant qualification criteria cannot be met, it might be possible to use
44、 ISO 3747 or ISO 9614. Noise test codes for specific families of machines or equipment should be based without any contradiction on the requirements of one or more of the basic documents of the ISO 3740 or ISO 9614 series. If measurements are made in typical machine rooms, where sources are normally
45、 installed, corrections may be required to account for background noise or undesired reflections. The methods specified in this International Standard permit the determination of sound power level as an A-weighted value directly from the A-weighted sound pressure level measurements. 0.3 In this Inte
46、rnational Standard, the computation of sound power level from sound pressure level measurements is based on the premise that the sound power output of the source is directly proportional to the mean-square sound pressure averaged in time and space. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov
47、 18 02:24:56 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 3746:1995 4 BSI 10-1998 Table 0.1 Overview of International Standards for determination of sound power levels of noise sources using enveloping surface methods over a reflecting plane and giving different grades of accuracy Parameter ISO
48、 3745 Precision method ISO 3744 Engineering method ISO 3746 Survey method Grade 1Grade 2Grade 3 Test environmentHemi-anechoic roomOutdoors or indoorsOutdoors or indoors Criterion for suitability of test environmenta K2 0,5 dBK2 2 dBK2 7 dB Volume of sound sourcePreferably less than 0,5 % of test roo
49、m volume No restriction: limited only by available test environment No restriction: limited only by available test environment Character of noiseAny (broad-band, narrow-band, discrete-frequency, steady, non-steady, impulsive) Limitation for background noisea L 10 dB (if possible, exceeding 15 dB) K1 0,4 dB L 6 dB (if possible, exceeding 15 dB) K1 1,3 dB L 3 dB K1 3 dB Number of measurement points 109b4b Instrumentation: a) Sound level meter at least complying with a) type 1 a
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