1、STD.BSI BS EN IS0 3740-EfiGL 200% H 1624669 089184b 77b 9 BRITISH STANDARD Acoustics - Determination of sound power levels of noise sources - Guidelines the use of basic standards for The European Standard EN IS0 3702000 has the status of a British Standard ICs 17.140.01 NO COPYING WITBOUT BSI PERMI
2、SSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN IS0 3740:ZOOl - STD-BSI BS EN IS0 3740-ENGL 2003 1624669 0893847 boil BS EN 374 - present to the responsible inte - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subc
3、ommittee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which im
4、plement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index“, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ail th
5、e 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. Summary of pages This document comprises a front cover, an inside front cover, the EN IS0 titl
6、e page, the EN IS0 foreword page, the IS0 title page, pages ii to vi, pages 1 to 25, the annex ZA page, an inside back cover and a back cover. “he BSI copyright notice displayed in this document indicates when the document was last issued. STD.BS1 BS EN IS0 3740-ENGL 2OOL Is Lb24669 0893848 549 EURO
7、PEAN STANDARD EN IS0 3740 NORME EUROPENNE EUROPISCHE NORM November 2000 ICs 01.014.01 English version Acoustics - Determination of sound power levels of noise sources - Guidelines for the use of basic standards (IS0 3740:2000) Acoustique - Dtermination des niveaux de puissance acoustique mis par les
8、 sources de bruit - Guide pour lutilisation des normes de base (IS0 3740:2000) Akustik - Bestimmung der Schallleistungspegel von Geruschquellen Leitlinien zur Anwendung der Grundnormen (IS0 3740:2000) This European Standard was approved by CEN on 17 September 2000. CEN members are bound to comply wi
9、th the CENICENELEC Internal Regulations 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 Management Centr
10、e or to any CEN member. This 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 Management Centre has the same status as the official ver
11、sions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMiTEE FOR STANDARDIZATION COMITE EUROPEE
12、N DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassar, 36 8-1050 Brussels Q 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN IS0 3740:2000 E STD-ES1 BS EN IS0 3740-ENGL ZUUJ1 111 Lb24669 0871849 98
13、5 EN IS0 3740:2000 Foreword The text of the International Standard IS0 3740:2000 has been prepared by Technical Committee ISO/TC 43 “Acoustics“ in collaboration with Technical Committee CEN/TC 21 1 “Acoustics“, the secretariat of which is held by DS. This European Standard shall be given the status
14、of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2001, and conflicting national standards shall be withdrawn at the latest by May 2001. According to the CENKENELEC Internal Regulations, the national standards organizations of the following co
15、untries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International
16、Standard IS0 3740:2000 was approved by CEN as a European Standard without any modification. NOTE: Normative references to International Standards are listed in annex ZA (normative). INTERNATIONAL STANDARD IS0 3740 Second edition 2000-1 1-01 Acoustics - Determination of sound power levels of noise so
17、urces - Guidelines for the use of basic standards Acoustique - Dtermination des niveaux de puissance acoustique mis par les sources de bruit - Guide pour lutilisation des normes de base Reference number IS0 3740:2000(E) STD-BSI BS EH:ISO 3 7 ua*; - ISO9614-1 and ISO9614-2 describe methods for determ
18、ining the sound power levels of machinery and equipment using sound intensity level measurements. b) Methods for the determination of emission sound pressure levels at work stations and at other specified positions This category includes the following standards: - IS0 11200 gives guidelines for the
19、choice of the method to be used; - IS0 11201, IS0 11202 and IS0 11204 give methods for determining emission sound pressure levels of machinery and equipment from measured sound pressure levels; - IS0 11203 gives methods for determining the emission sound pressure levels of machinery and equipment fr
20、om the sound power levels. V STDOBSI BS EN IS0 3740-ENGL 2001 H Lb24669 0891854 842 EN IS0 3740:2000 c) Noise test codes For a particular family of machinery or equipment, a noise test code specifies the following: - the methods and instruments to be used for the determination of the sound power lev
21、el; - the method to be used for the determination of emission sound pressure levels at work stations and/or at other specified positions; - the positions of the work stations; - the mounting and operating conditions of the machine under test for the purpose of determining the noise emission quantiti
22、es; - the method to be used for verifying declared noise emission quantities. IS0 12001 gives rules for the drafting and presentation of a noise test code. vi STD-BSI BS EN IS0 3740-ENGL 2OOL W Lb24bb9 0893855 789 = EN IS0 3740:2000 Acoustics - Determination of sound power levels of noise sources -
23、Guidelines for the use of basic standards 1 Scope This International Standard gives guidance for the use of a series of nine International Standards describing various methods for determining the sound power levels from all types of machinery and equipment. It provides: - brief summaries of these ba
24、sic International Standards; - guidance on the selection of one or more of these standards which are appropriate to any particular type (see clause 5 and annex D). The guidance given applies only to airborne sound. It is for use in the preparation of noise test codes (see IS0 12001) and also in nois
25、e testing where no specific noise test code exists. This International Standard is not intended to replace any of the details of, or add any additional requirements to, the individual test methods in the other basic standards referred to. These basic standards specify the acoustical requirements for
26、 measurements appropriate for different test environments and accuracies. It is important that specific test codes for various types of machinery and equipment be established and used in accordance with the requirements of these basic International Standards. Such standardized noise test codes will
27、recommend the basic International Standard) to be used and will give detailed requirements on mounting and operating conditions for a particular family to which the machine under test belongs. If no specific noise test code exists for a particular type of machinery, this International Standard is of
28、 use for the choice of the most suitable of the basic standards. In all cases, the mounting and operating conditions of the machine under test should be in accordance with the general principles given in the basic standards. NOTE Two quantities which complement each other can be used to describe the
29、 sound emission of machinery or equipment. One is the emission sound pressure level at a specified position and the other is the sound power level. The International Standards which describe the basic methods for determining emission sound pressure levels at the work station and at other specified p
30、ositions are the series IS0 11 200 to IS0 11204. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publ
31、ications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to a
32、pplies. Members of IS0 and IEC maintain registers of currently valid International Standards. IS0 3741 :I 999, Acoustics - Determination of sound power levels of noise sources using sound pressure - Precision methods for reverberation rooms. IS0 3743-1, Acoustics - Determination of sound power level
33、s of noise sources using sound pressure - Engineering methods for small, movable sources in reverberant fields - Part 7: Comparison method for hard- walled test rooms. 1 STD-BSI BS EN IS0 3740-ENGL 2001 1624669 0891856 615 m EN IS0 3740:2000 IS0 3743-2:1994, Acoustics - Determination of sound power
34、levels of noise sources using sound pressure - Engineering methods for small, movable sources in reverberant fields - Part 2: Methods for special reverberation test rooms. IS0 3744:1994, Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering method in an
35、essentially free field over a reflecting plane. IS0 3745:-1), Acoustics - Determination of sound power levels of noise sources using sound pressure - Precision methods for anechoic and hemi-anechoic rooms. IS0 3746:1995, Acoustics - Determination of sound power levels of noise sources using sound pr
36、essure - Survey method using an enveloping measurement surface over a reflecting plane. IS0 3747, Acoustics - Determination of sound power levels of noise sources using sound pressure - Comparison method in situ. IS0 961 4-1 :1993, Acoustics - Determination of sound power levels of noise sources usi
37、ng sound intensity - Part 7: Measurement at discrete points. IS0 9614-2:1996, Acoustics - Determination of sound power levels of noise sources using sound intensity - Part 2: Measurement by scanning. IS0 12001, Acoustics - Noise emitted by machinery and equipment - Rules for the drafting and present
38、ation of a noise test code. IEC 61 672-1, Electroacoustics - Sound level meters - Part 7: Specifications. 3 Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. More detailed definitions may be found in the IS0 3740 series (which includes
39、IS0 3741 through IS0 3747), in IS0 961 4-1 and IS0 961 4-2 and in noise test codes for specific types of machinery and equipment. 3.1 emission airborne sound radiated by a well-defined noise source (e.g. the machine under test) under specified operating and mounting conditions NOTE Emission values m
40、ay be incorporated in a product label and/or product specification. The basic noise emission quantities are the sound power level of the source itself and the emission sound pressure levels at the work station andior at other specified positions (if any) in the vicinity of the source. IS0 120011 3.2
41、 sound power W rate per unit time at which airborne sound energy is radiated by a source NOTE It is expressed in watts. IS0 120011 1) To be published. (Revision of IS0 3745:1977) 2 STD.BSI BS EN IS0 3740-ENGL 2001 Lb2Ybb9 0891857 551 m EN IS0 3740:2000 3.3 sound power level ten times the logarithm t
42、o the base 10 of the ratio of the sound power radiated by the source under test to the reference sound power Wo = 1 pW (10-l2 W) LW NOTE 1 It is expressed in decibels. NOTE 2 sound power level (LwA). The frequency weighting or the width of the frequency band used should be indicated; for example A-w
43、eighted NOTE 3 Adapted from IS0 12001. 3.4 sound pressure level ten times the logariihm to the base 10 of the ratio of the square of the sound pressure to the square of the reference sound pressure Po = 20 pPa (2 x 10-5 Pa) LP NOTE 1 It is expressed in decibels. NOTE2 IEC 61 672-1) should be indicat
44、ed. The frequency weighting or the width of the frequency band used, and the time weighting (S, F or I, see NOTE 3 Adapted from IS0 3744. 3.5 time-averaged sound pressure level LWT sound pressure level of a continuous steady sound that, within a measurement time interval T, has the same mean- square
45、 sound pressure as a sound under consideration which varies with time: NOTE 1 It is expressed in decibels. NOTE 2 shall be measured with an instrument which complies with the requirements of IEC 61672-1. A-weighted time-averaged sound pressure levels are denoted by LpAeqp which is usually abbreviate
46、d to LpA. LpAeqT NOTE 3 determined over a certain measurement time interval. In general, the subscripts “eq“ and “T are omitted since time-averaged sound pressure levels are necessarily NOTE 4 Adapted from IS0 12001. 3.6 sound energy level ten times the logarithm to the base 10 of the ratio of the s
47、ound energy E (in joules) of the single burst of sound or transient sound radiated by the sound source under test to the reference sound energy Eo = 1 pJ (10-l2 J): LJ LJ =10lg(EIEo)dB NOTE 1 It is expressed in decibels. NOTE 2 The frequency weighting or the width of the frequency band used should b
48、e indicated. 3 STDoBSI ES EN IS0 3740-ENGL 2001 = Lb24669 089185c3 498 EN IS0 3740:2000 3.7 singleevent sound pressure level %,ls time-integrated sound pressure level of an isolated single sound event of specified duration T (or specified measurement time T) normalized to To = 1 s: T2 Lp,ls =10 Ig I
49、judr dB To. PO NOTE 1 It is expressed in decibels. NOTE 2 Adapted from IS0 3744. 3.8 sound intensity I product of the sound pressure at a point and the associated particle velocity -) NOTE It is a vectorial quantity. 3.9 background noise noise from all sources other than the source under test NOTE instrumentation. Background noise may include contributions from airborne sound, structure-borne vibration, and electrical noise in IS0 37441 3.10 background noise level sound pressure level measured when the source under test is not operating NOTE It is exp
