1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 3744:2010Acoustics Determinationof sound power levels andsound energy levels of noisesources using sound pressure Engineering methodsfor an essentially free fieldover a
2、 reflecting plane (ISO3744:2010)BS EN ISO 3744:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 3744:2010.It supersedes BS EN ISO 3744:2009 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EH/1/4, Machinery n
3、oise.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 2011ISBN 978 0 580 53880 3ICS 17.140.01Compliance with a
4、 British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2011.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3744 O
5、ctober 2010 ICS 17.140.01 Supersedes EN ISO 3744:2009English Version Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Engineering methods for an essentially free field over a reflecting plane (ISO 3744:2010) Acoustique - Dtermination des
6、 niveaux de puissance et dnergie acoustiques mis par les sources de bruit partir de la pression acoustique - Mthodes dexpertise pour des conditions approchant celles du champ libre sur plan rflchissant (ISO 3744:2010) Akustik - Bestimmung der Schallleistungs- und der Schallenergiepegel von Geruschqu
7、ellen aus Schalldruckmessungen - Hllflchenverfahren der Genauigkeitsklasse 2 fr ein im Wesentlichen freies Schallfeld ber einer reflektierenden Ebene (ISO 3744:2010) This European Standard was approved by CEN on 14 August 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulation
8、s 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 Management Centre or to any CEN member. This Europ
9、ean 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 Management Centre has the same status as the official versions. CEN members are the nat
10、ional 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, Switze
11、rland 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. No. E
12、N ISO 3744:2010: EBS EN ISO 3744:2010EN ISO 3744:2010 (E) 3 Foreword The text of ISO 3744:2010 has been prepared by Technical Committee ISO/TC 43 “Acoustics” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 3744:2010 by Technical Committee CEN/TC 211 “Aco
13、ustics” the secretariat of which is held by DS. This 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 April 2011, and conflicting national standards shall be withdrawn at the latest by April 2011. Atten
14、tion is drawn to the possibility that some of 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 3744:2009. This document has been prepared under a mandate
15、given to CEN by the European Commission and the 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 natio
16、nal standards organizations of the following 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,
17、Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 3744:2010 has been approved by CEN as a EN ISO 3744:2010 without any modification. BS EN ISO 3744:2010EN ISO 3744:2010 (E) 4 Annex ZA (informative) Relationshi
18、p between this European Standard and 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
19、Approach Directive 2006/42/EC on machinery. Once this standard is cited in the Official Journal of the European Communities 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 li
20、mits of the scope of this standard, 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 3744:2
21、010ISO 3744:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references2 3 Terms and definitions .2 4 Test environment.8 5 Instrumentation .11 6 Definition, location, installation, and operation of noise source under test.12 7 Reference box and me
22、asurement surface14 8 Determination of sound power levels and sound energy levels 18 9 Measurement uncertainty.26 10 Information to be recorded.29 11 Test report31 Annex A (normative) Qualification procedures for the acoustic environment 32 Annex B (normative) Microphone arrays on a hemispherical me
23、asurement surface .37 Annex C (normative) Microphone arrays on a parallelepiped measurement surface .44 Annex D (informative) Microphone arrays on a cylindrical measurement surface55 Annex E (normative) Calculation of A-weighted sound power levels and A-weighted sound energy levels from frequency ba
24、nd levels59 Annex F (normative) Alternative microphone array on a hemispherical measurement surface for direct measurements of A-weighted sound pressure levels 61 Annex G (normative) Sound power level and sound energy level under reference meteorological conditions.64 Annex H (informative) Guideline
25、s on the development of information on measurement uncertainty 66 Bibliography77 BS EN ISO 3744:2010ISO 3744:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work o
26、f 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. International organizations, governmental and non-governmenta
27、l, 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 rules given in the ISO/IEC Directives, Part 2. The main
28、 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 at least 75 % of the member bodies casting a vote. Atte
29、ntion 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 3744 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise. This third e
30、dition of ISO 3744 cancels and replaces the second edition (ISO 3744:1994) and ISO 4872:1978, of which it constitutes a merger and a technical revision. BS EN ISO 3744:2010ISO 3744:2010(E) ISO 2010 All rights reserved vIntroduction This International Standard is one of the series ISO 37412to ISO 374
31、76, which specify various methods for determining the sound power levels and sound energy levels of noise sources including machinery, equipment and their sub-assemblies. General guidelines to assist in the selection are provided in ISO 37401. The selection depends on the environment of the availabl
32、e test facility and on the precision of the sound power level or sound energy level values required. It may be necessary to establish a noise test code (see ISO 12001) for the individual noise source in order to select the appropriate sound measurement surface and microphone array from among those a
33、llowed in each member of the ISO 37412to ISO 37476series, and to give requirements on 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 the test environment is calculated f
34、rom 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 sound event is calculated from this sound power and the time over which it existed. The methods specified in this Internationa
35、l Standard permit the determination of the sound power level and the sound energy level in frequency bands optionally with frequency A-weighting applied. For applications where greater accuracy is required, reference can be made to ISO 3745, ISO 37412or ISO 961413-15. If the relevant criteria for th
36、e measurement environment specified in this International Standard are not met, it might be possible to refer to another standard from this series, or to ISO 961413-15. This International Standard describes methods of accuracy grade 2 (engineering grade) as defined in ISO 12001, when the measurement
37、s are performed in a space that approximates an acoustically free field over a reflecting plane. Such an environment can be found in a specially designed room, or within industrial buildings or outdoors. Ideally, the test source should be mounted on a sound-reflecting plane located in a large open s
38、pace. For sources normally 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. BS EN ISO 3744:2010BS EN ISO 3744:2010INTERNATIONAL STANDARD ISO 3744:
39、2010(E) ISO 2010 All rights reserved 1Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Engineering methods for an essentially free field over a reflecting plane 1 Scope 1.1 General This International Standard specifies methods for determinin
40、g the sound power level or sound energy level of a noise source from sound pressure levels measured on a surface enveloping the noise source (machinery or equipment) in an environment that approximates to an acoustic free field near one or more reflecting planes. The sound power level (or, in the ca
41、se of noise bursts or transient noise emission, the sound energy level) produced by the noise source, in frequency bands or with A-weighting applied, is calculated using those measurements. NOTE Differently shaped measurement surfaces can yield differing estimates of the sound power level of a given
42、 noise source and an appropriately drafted noise test code (see ISO 12001) gives detailed information on the selection of the surface. 1.2 Types of noise and noise sources The methods specified in this International Standard are suitable for all types of noise (steady, non-steady, fluctuating, isola
43、ted bursts of sound energy, etc.) defined in ISO 12001. This International Standard is applicable to all types and sizes of noise source (e.g. stationary or slowly moving plant, installation, machine, component or sub-assembly), provided the conditions for the measurements can be met. NOTE It is pos
44、sible that the conditions for measurements given in this International Standard are impracticable for very tall or very long sources such as chimneys, ducts, conveyors and multi-source industrial plants. A noise test code for the determination of noise emission of specific sources can provide altern
45、ative 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 located indoors or outdoors, with one or more sound-reflecting planes present on or near which the noise source under test is mounte
46、d. The ideal environment is a completely open space with no bounding or reflecting surfaces other than the reflecting plane(s) (such as that provided by a qualified hemi-anechoic chamber), but procedures are given for applying corrections (within limits that are specified) in the case of environment
47、s that are less than ideal. 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 Standard, for measurements made in limited bands of frequency and with frequency A-weighting applied. The
48、 uncertainty conforms to ISO 12001:1996, accuracy grade 2 (engineering grade). BS EN ISO 3744:2010ISO 3744:2010(E) 2 ISO 2010 All rights reserved2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition ci
49、ted applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3382-2, Acoustics Measurement of room acoustic parameters Part 2: Reverberation time in ordinary rooms ISO 3745, Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Precision methods for anechoic test rooms and hemi- anechoic test rooms ISO 5725 (all parts), Accuracy (trueness and precision) of measurement methods and results ISO 6926,
