1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 3746:2010Acoustics Determinationof sound power levels andsound energy levels of noisesources using sound pressure Survey method using anenveloping measurementsurface ov
2、er a reflecting plane(ISO 3746:2010)BS EN ISO 3746:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 3746:2010.It supersedes BS EN ISO 3746:2009 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EH/1/4, Machine
3、ry noise.A list of organizations 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. BSI 2010ISBN 978 0 580 53882 7ICS 17.140.01Compliance wi
4、th a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2010.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3
5、746 December 2010 ICS 17.140.01 Supersedes EN ISO 3746:2009English Version Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:2010) Acoustique - Dtermi
6、nation des niveaux de puissance acoustique et des niveaux dnergie 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 3746:2010) Akustik - Ermittlung der Schallleistungs- und Sch
7、allenergiepegel von Geruschquellen aus Schalldruckmessungen - Hllflchenverfahren der Genauigkeitsklasse 3 ber einer reflektierenden Ebene (ISO 3746:2010) This European Standard was approved by CEN on 13 November 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which st
8、ipulate 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. This Europea
9、n 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 members are t
10、he 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, Spain, Sweden,
11、Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref.
12、 No. EN ISO 3746:2010: EBS EN ISO 3746:2010EN ISO 3746:2010 (E) 3 Foreword This document (EN ISO 3746:2010) 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 European Standard s
13、hall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2011, and conflicting national standards shall be withdrawn at the latest by June 2011. Attention is drawn to the possibility that some of the elements of this documen
14、t 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 3746:2009. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Associ
15、ation, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), 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 countries are bound to
16、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, Slovenia, Spain, Sweden
17、, Switzerland and the United Kingdom. Endorsement notice The text of ISO 3746:2010 has been approved by CEN as a EN ISO 3746:2010 without any modification. BS EN ISO 3746:2010EN ISO 3746:2010 (E) 4 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of E
18、U 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 a means of conforming to Essential Requirements of the New Approach Directive 2006/42/EC on machinery. Once this standard is cite
19、d 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, a presumption of conformity with the cor
20、responding Essential Requirements of that Directive and associated EFTA regulations. WARNING Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this standard. BS EN ISO 3746:2010ISO 3746:2010(E) ISO 2010 All rights reserved iiiContents Page For
21、eword iv Introduction.v 1 Scope1 2 Normative references2 3 Terms and definitions .2 4 Test environment.6 5 Instrumentation .7 6 Definition, location, installation and operation of noise source under test7 7 Reference box and measurement surface10 8 Determination of sound power levels and sound energ
22、y levels 13 9 Measurement uncertainty.18 10 Information to be recorded.21 11 Test report23 Annex A (normative) Determination of the environmental correction 24 Annex B (normative) Microphone arrays on a hemispherical measurement surface .25 Annex C (normative) Microphone arrays on a parallelepiped m
23、easurement surface .30 Annex D (informative) Guidelines on the development of information on measurement uncertainty 38 Bibliography47 BS EN ISO 3746:2010ISO 3746:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of nat
24、ional 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 subject for which a technical committee has been established has the right to be represented on that committee. Interna
25、tional organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the r
26、ules 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 are circulated to the member bodies for voting. Publication as an International Standard requires approval by a
27、t 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 responsible for identifying any or all such patent rights. ISO 3746 was prepared by Technical Committee ISO/TC
28、 43, Acoustics, Subcommittee SC 1, Noise. This third edition cancels and replaces the second edition (ISO 3746:1995), which has been technically revised. It also incorporates the Technical Corrigendum ISO 3746:1995/Cor.1:1995. BS EN ISO 3746:2010ISO 3746:2010(E) ISO 2010 All rights reserved vIntrodu
29、ction This International Standard is one of the series ISO 37412to ISO 37476, which specify methods for determining the sound power levels and sound energy levels of noise sources including machinery, equipment and their sub-assemblies. Guidelines to select one of those methods are provided in ISO 3
30、7401. The selection depends on the environment of the available test facility and on the precision of the sound power level or sound energy level values required. It may be necessary to establish a test code for the individual noise source in order to select the appropriate sound measurement surface
31、 and microphone array from among those allowed in each of the ISO 37401to ISO 37476series, and to give requirements for test unit mounting, loading, and operating conditions under which the sound power levels or sound energy levels are to be obtained. The sound power emitted by a given source into t
32、he test environment is calculated from the mean square sound pressure that is measured over a hypothetical measurement surface enclosing the source, and the area of that surface. The sound energy for a single machine event is calculated from this sound power and the time over which it existed. This
33、International Standard specifies methods giving results of ISO 12001:1996, accuracy grade 3 (survey grade) when measurements are performed within industrial buildings or outdoors. Ideally, the test source should be mounted on a sound-reflecting plane located in a large open space. For sources normal
34、ly installed on the floor of machine rooms, corrections are defined to account for undesired reflections from nearby objects, walls, and the ceiling, and for the residual background noises that occur there. The methods specified in this International Standard permit the determination of the sound po
35、wer level and the sound energy level with frequency A-weighting applied. For applications where greater accuracy is required, reference can be made to ISO 3744, ISO 37455or an appropriate part of ISO 961414-16. If the relevant criteria for the measurement environment specified in this International
36、Standard are not met, it might be possible to refer to another of the ISO 37412to ISO 37476series, or to an appropriate part of ISO 961414-16. BS EN ISO 3746:2010BS EN ISO 3746:2010INTERNATIONAL STANDARD ISO 3746:2010(E) ISO 2010 All rights reserved 1Acoustics Determination of sound power levels and
37、 sound energy levels of noise sources using sound pressure Survey method using an enveloping measurement surface over a reflecting plane 1 Scope 1.1 General This International Standard specifies methods for determining the sound power level or sound energy level of a noise source from sound pressure
38、 levels measured on a surface enveloping a noise source (machinery or equipment) in a test environment for which requirements are given. The sound power level (or, in the case of noise bursts or transient noise emission, the sound energy level) produced by the noise source with frequency A-weighting
39、 applied is calculated using those measurements. NOTE Differently shaped measurement surfaces can yield differing estimates of the sound power level of a given noise source and an appropriately drafted test code (see ISO 12001) gives detailed information on the selection of the surface. 1.2 Types of
40、 noise and noise sources The methods specified in this International Standard are suitable for all types of noise (steady, non-steady, fluctuating, isolated bursts of sound energy, etc.) defined in ISO 12001. This International Standard is applicable to all types and sizes of noise source (e.g. stat
41、ionary or slowly moving plant, installation, machine, component or sub-assembly), provided the conditions for the measurements can be met. NOTE The conditions for measurements given in this International Standard can be impracticable for very tall or very long sources such as chimneys, ducts, convey
42、ors, and multi-source industrial plants. A test code for the determination of noise emission of specific sources can provide alternative methods in such cases. 1.3 Test environment The test environments that are applicable for measurements made in accordance with this International Standard can be l
43、ocated indoors or outdoors, with one or more sound-reflecting planes present on or near which the noise source under test is mounted. 1.4 Measurement uncertainty Information is given on the uncertainty of the sound power levels and sound energy levels determined in accordance with this International
44、 Standard, for measurements made with frequency A-weighting applied. The uncertainty conforms with that of ISO 12001:1996, accuracy grade 3 (survey grade). BS EN ISO 3746:2010ISO 3746:2010(E) 2 ISO 2010 All rights reserved2 Normative references The following referenced documents are indispensable fo
45、r the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3744, Acoustics Determination of sound power levels and sound energy levels of noise sources using s
46、ound pressure Engineering methods for an essentially free field over a reflecting plane ISO 5725 (all parts), Accuracy (trueness and precision) of measurement methods and results ISO 12001:1996, Acoustics Noise emitted by machinery and equipment Rules for the drafting and presentation of a noise tes
47、t code ISO/IEC Guide 98-3, Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) IEC 60942:2003, Electroacoustics Sound calibrators IEC 61672-1:2002, Electroacoustics Sound level meters Part 1: Specifications 3 Terms and definitions For the purposes of t
48、his document, the following definitions apply. 3.1 sound pressure p difference between instantaneous pressure and static pressure NOTE 1 Adapted from ISO 80000-8:200723, 8-9.2. NOTE 2 Sound pressure is expressed in pascals. 3.2 sound pressure level Lpten times the logarithm to the base 10 of the rat
49、io of the square of the sound pressure, p, to the square of a reference value, p0, expressed in decibels 22010 lg dBppLp= (1) where the reference value, p0, is 20 Pa ISO/TR 25417:200722, 2.2 NOTE 1 If specific frequency and time weightings as specified in IEC 61672-1 and/or specific frequency bands are applied, this is indicated by appropriate subscripts; e.g. LpAdenotes the A-weighted sound pressure level. NOTE 2 This definition is technically in accordance with ISO 80000-8:200723, 8-22. BS
