1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 3745:2012Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Precision methods for anechoic rooms and hemi-anech
2、oic rooms BS EN ISO 3745:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 3745:2012.It supersedes BS EN ISO 3745:2009 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EH/1/4, Machinery noise.A list of organiz
3、ations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012 ISB
4、N 978 0 580 53881 0 ICS 17.140.01 Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2012. Amendments issued since publicationDate T e x t a f f e c t e dEUR
5、OPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3745 March 2012 ICS 17.140.01 Supersedes EN ISO 3745:2009English Version Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for anechoic rooms and hemi-anechoic rooms
6、(ISO 3745:2012) Acoustique - Dtermination des niveaux de puissance acoustique et des niveaux dnergie acoustique mis par les sources de bruit partir de la pression acoustique - Mthodes de laboratoire pour les salles anchoques et les salles semi-anchoques (ISO 3745:2012) Akustik - Bestimmung der Schal
7、lleistungs- und Schallenergiepegel von Geruschquellen aus Schalldruckmessungen - Verfahren der Genauigkeitsklasse 1 fr reflexionsarme Rume und Halbrume (ISO 3745:2012) This European Standard was approved by CEN on 14 March 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulatio
8、ns which stipulate 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 CEN-CENELEC Management Centre or to any CEN member. T
9、his European Standard exists 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN me
10、mbers are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spai
11、n, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nat
12、ional Members. Ref. No. EN ISO 3745:2012: EBS EN ISO 3745:2012EN ISO 3745:2012 (E) 3 Foreword This document (EN ISO 3745:2012) has been prepared by Technical Committee ISO/TC 43 “Acoustics“ in collaboration with Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by DS. This
13、European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2012, and conflicting national standards shall be withdrawn at the latest by September 2012. Attention is drawn to the possibility that some of
14、 the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 3745:2009. This document has been prepared under a mandate given to CEN by the European Commission and t
15、he European Free Trade Association, and supports essential requirements of EU Directive. For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
16、countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia,
17、Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 3745:2012 has been approved by CEN as a EN ISO 3745:2012 without any modification. BS EN ISO 3745:2012EN ISO 3745:2012 (E) 4 Annex ZA (informative) Relationship between this European Standard and
18、the Essential Requirements of EU Directive 2006/42/EC This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide one means of conforming to Essential Requirements of the New Approach Directive 2006/42/EC, Machin
19、ery directive. Once this standard is cited in the Official Journal of the European Union under that Directive and has been implemented as a national standard in at least one Member State, compliance with the normative clauses of this standard confers, within the limits of the scope of this standard,
20、 a presumption of conformity with the relevant Essential Requirements of that Directive and associated EFTA regulations. WARNING Other requirements and other EU Directives may be applicable to the products falling within the scope of this standard. BS EN ISO 3745:2012ISO 3745:2012(E) ISO 2012 All ri
21、ghts reserved iiiContents PageForeword . vIntroduction . vi1 Scope 11.1 General . 11.2 Types of noise and noise sources 11.3 Test room . 11.4 Measurement uncertainty . 12 Normative references . 13 Terms and definitions . 24 Reference meteorological conditions 75 Test rooms . 85.1 Acoustic criterion
22、for adequacy of the test room . 85.2 Criteria for background noise 85.3 Criterion for air temperature . 96 Instrumentation 96.1 Instruments for acoustical measurements . 96.2 Instruments for meteorological measurements 117 Definition, location, installation and operation of noise source under test 1
23、17.1 General . 117.2 Auxiliary equipment 117.3 Noise source location 117.4 Mounting of the noise source 127.5 Operation of source during test 128 Measurement surface .138.1 Spherical measurement surface for use in an anechoic room .138.2 Hemispherical measurement surface for use in a hemi-anechoic r
24、oom .139 Determination of sound power levels and sound energy levels 149.1 Measurements in the test room .149.2 Measurement of meteorological conditions 149.3 Microphone positions 149.4 Determination of sound power levels of a noise source which emits steady or non-steady noise .169.5 Determination
25、of sound energy levels for a noise source which emits impulsive noise 209.6 Calculation of directivity indices .229.7 Calculation of surface sound pressure level non-uniformity index 239.8 Frequency-weighted sound power level and sound energy level .2310 Measurement uncertainty .2310.1 Methodology .
26、2310.2 Determination of omc.2410.3 Determination of R02410.4 Typical upper bound values of R02510.5 Total standard deviation, tot, and expanded measurement uncertainty, U 2611 Information to be recorded .2711.1 General .2711.2 Noise source under test 2711.3 Test room .2711.4 Instrumentation 2711.5 A
27、coustical data 2712 Test report .28BS EN ISO 3745:2012ISO 3745:2012(E)iv ISO 2012 All rights reservedAnnex A (normative) General procedures for qualification of anechoic and hemi-anechoic rooms 29Annex B (normative) Qualification procedure for spaces within test rooms used in the determination of so
28、und power levels and sound energy levels of specific noise sources 36Annex C (normative) Calculation of A-weighted sound power levels and A-weighted sound energy levels from one-third-octave band levels .38Annex D (normative) Array of microphone positions on a spherical measurement surface in a free
29、 field .40Annex E (normative) Arrays of microphone positions on a hemispherical measurement surface in a hemi-free field .43Annex F (normative) Coaxial circular paths of microphones on a hemispherical measurement surface in a hemi-free field .48Annex G (normative) Meridional paths of microphones on
30、a hemispherical measurement surface in a hemi-free field .49Annex H (normative) Spiral paths of microphones on a hemispherical measurement surface in a hemi-free field .51Annex I (informative) Guidance on the development of information on measurement uncertainty 52Bibliography .62BS EN ISO 3745:2012
31、ISO 3745:2012(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subjec
32、t for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC)
33、 on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees
34、are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held
35、responsible for identifying any or all such patent rights.ISO 3745 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise.This third edition cancels and replaces the second edition (ISO 3745:2003), which has been technically revised. ISO 2012 All rights reserved vBS EN IS
36、O 3745:2012ISO 3745:2012(E)IntroductionThis International Standard is one of the series ISO 37413to ISO 37478, which specify various methods for determining the sound power levels and sound energy levels of noise sources including machinery, equipment and their sub-assemblies. The selection of one o
37、f the methods from the series for use in a particular application depends on the purpose of the test to determine the sound power level or sound energy level and on the facilities available. General guidelines to assist in the selection are provided in ISO 37402. ISO 37413to ISO 37478give only gener
38、al principles regarding the operating and mounting conditions of the machinery or equipment for the purposes of the test. It is important that test codes be established for individual kinds of noise source, in order to give detailed requirements on mounting, loading and operating conditions under wh
39、ich the sound power levels or sound energy levels are to be obtained and to select the appropriate measurement surface and microphone array from among those specified in this International Standard.The methods given in this International Standard require the source to be mounted in either an anechoi
40、c room or a hemi-anechoic room having specified acoustical characteristics. The methods are then based on the premise that the sound power or sound energy of the source is directly proportional to the mean-square sound pressure over a hypothetical measurement surface enclosing the source and otherwi
41、se depends on the physical constants of air.The methods specified in this International Standard permit the determination of the sound power level and the sound energy level in frequency bands and/or with frequency A-weighting applied.The methods give a precision grade of accuracy (grade 1) as defin
42、ed in ISO 12001. The resulting sound power levels and sound energy levels include corrections to allow for any differences that might exist between the meteorological conditions under which the tests are conducted and reference meteorological conditions. For applications where there are large uncert
43、ainties due to operating conditions or where reduced accuracy is acceptable, reference can be made to the more practical methods of ISO 37446or ISO 37467. Guidance on evaluation of measurement uncertainty is given in Annex I.vi ISO 2012 All rights reservedBS EN ISO 3745:2012Acoustics Determination o
44、f sound power levels and sound energy levels of noise sources using sound pressure Precision methods for anechoic rooms and hemi-anechoic rooms1 Scope1.1 GeneralThis International Standard specifies methods for measuring the sound pressure levels on a measurement surface enveloping a noise source (m
45、achinery or equipment) in an anechoic room or a hemi-anechoic room. The sound power level (or, in the case of impulsive or transient noise emission, the sound energy level) produced by the noise source, in frequency bands of width one-third octave or with frequency weighting A applied, is calculated
46、 using those measurements, including corrections to allow for any differences between the meteorological conditions at the time and place of the test and those corresponding to a reference characteristic acoustic impedance.In general, the frequency range of interest includes the one-third-octave ban
47、ds with mid-band frequencies from 100 Hz to 10 000 Hz. In practice, the range is extended or restricted to frequencies beyond or within these limits, to those between which the test room is qualified for the purposes of the measurements.1.2 Types of noise and noise sourcesThe methods specified in th
48、is International Standard are suitable for all types of noise (steady, non-steady, fluctuating, isolated bursts of sound energy, etc.) defined in ISO 12001.The noise source under test can be a device, machine, component or sub-assembly. The maximum size of the noise source depends on specified requi
49、rements regarding the radius of the hypothetical sphere or hemisphere used as the enveloping measurement surface.1.3 Test roomThe test rooms that are applicable for measurements made in accordance with this International Standard are an anechoic room or hemi-anechoic room, also called, respectively, a free-field test room or hemi-free-field test room.1.4 Measurement uncertaintyInformation is given on the uncertainty of the sound power levels and sound energy levels determined in accordance with this International Standard, f
