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1、BRITISH STANDARD BS EN ISO 14257:2001 Incorporating Corrigendum No. 1 Acoustics Measurement and parametric description of spatial sound distribution curves in workrooms for evaluation of their acoustical performance The European Standard EN ISO 14257:2001 has the status of a British Standard ICS 13.
2、140; 17.140 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:10:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 14257:2001 This British Standard, having been prepared under the direction of the Health and Environ
3、mental Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 14 November 2001 BSI 25 January 2002 ISBN 0 580 38673 2 National foreword This British Standard is the official English language version of EN ISO 14257:2001. It is identi
4、cal with ISO 14257:2001. The UK participation in its preparation was entrusted by Technical Committee EH/1, Acoustics, to subcommittee EH/1/4, Machinery noise, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross
5、-references The British Standards which implement international or European publications referred to in this document 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
6、 Catalogue. A British Standard does not purport to include all 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. aid enquirers to understand t
7、he text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a fro
8、nt cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to v, a blank page, pages 1 to 25, the annex ZA page, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. A
9、mendments issued since publication Amd. No. DateComments 13673 Incorp. Corr. No. 1 25 January 2002 Incorporating annex ZA Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:10:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 14257 October
10、2001 ICS 13.140 English version Acoustics - Measurement and parametric description of spatial sound distribution curves in workrooms for evaluation of their acoustical performance (ISO 14257:2001) Acoustique - Mesurage et description paramtrique des courbes de dcroissance sonore spatiale dans les lo
11、caux de travail en vue de lvaluation de leur performance acoustique (ISO 14257:2001) Akustik - Messung und Parametrisierung von Schallausbreitungskurven in Arbeitrumen zum Zweck der Beurteilung der akustischen Qualitt der Rume (ISO 14257:2001) This European Standard was approved by CEN on 5 October
12、2001. CEN members are bound to comply with the CEN/CENELEC 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 obtaine
13、d on application to the Management Centre 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
14、 has the same status as the official versions. 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 COM
15、MITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2001 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 14257:2001 E Licensed Copy: she
16、ffieldun sheffieldun, na, Sat Nov 18 02:10:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI CORRECTED 2001-12-12 Foreword The text of the International Standard ISO 14257:2001 has been prepared by Technical Committee ISO/TC 43 “Acoustics“ in collaboration with Technical Committee CEN/TC 211 “Acoustics“
17、, 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 2002, and conflicting national standards shall be withdrawn at the latest by April 2002. According t
18、o the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spai
19、n, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO 14257:2001 was approved by CEN as a European Standard without any modification. NOTE: Normative references to International Standards are listed in annex ZA (normative). EN ISO 14257:2001 Lic
20、ensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:10:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 14257:2001(E) INTERNATIONAL STANDARD ISO 14257 First edition 2001-10-15 Acoustics Measurement and parametric description of spatial sound distribution curves in workrooms for
21、evaluation of their acoustical performance Acoustique Mesurage et description paramtrique des courbes de dcroissance sonore spatiale dans les locaux de travail en vue de lvaluation de leur performance acoustique EN ISO 14257:2001 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:10:40 GMT+00
22、:00 2006, Uncontrolled Copy, (c) BSI ii EN ISO 14257:2001 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:10:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iii ContentsPage Foreword.iv Introduction.v 1Scope 1 2Normative references1 3Terms and definitions .1 4Sound distribution in a room3 4.
23、1General3 4.2Spatial sound distribution curves3 5Measurement of the spatial sound distribution curve.5 5.1Specifications regarding the sound source used for the test 5 5.2Measurement instrumentation .6 5.3Measurement path and points7 5.4Measurement procedure.8 5.5Representation of the measured data
24、.8 6Parametric description of the measured spatial sound distribution curve in view of evaluation of the acoustical performance of workrooms.9 6.1General9 6.2Distance ranges.9 6.3Determination of the rate of spatial decay of sound pressure levels per distance doubling, DL2.9 6.4Determination of the
25、excess of sound pressure level with respect to a reference sound distribution curve, DLf.10 6.5Evaluation of measured data12 7Information to be recorded and reported12 Annex A (normative) Performance requirements for the sound source to be used for the test14 Annex B (normative) Correction of measur
26、ed sound distribution curves to account for differences in ground reflections and source directivity.16 Annex C (informative) Example of use of this International Standard 17 Bibliography25 EN ISO 14257:2001 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:10:40 GMT+00:00 2006, Uncontrolled
27、 Copy, (c) BSI iv Foreword ISO (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 sub
28、ject 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 (I
29、EC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Intern
30、ational 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 International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights
31、. International Standard ISO 14257 was prepared by Technical Committee ISO/TC 43, Acoustics, Subcommittee SC 1, Noise. Annexes A and B form a normative part of this International Standard. Annex C is for information only. EN ISO 14257:2001 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:10
32、:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI v Introduction According to ISO 11690-1, the spatial sound distribution in a workroom is described by a curve characterizing the sound pressure level from a point source with a known sound power level, and with steady emission and omnidirectional sound
33、radiation as a function of the distance from the source. This International Standard specifies a method for the determination of that spatial sound distribution curve, and for the derivation of two characteristics (rate of spatial decay of sound pressure levels per distance doubling and excess of so
34、und pressure level) for the room in question. Data obtained using this International Standard are of use for the following: ?acoustical qualification of a room with respect to noise control; ?determination of appropriate positions of a machine and of work stations in a room; ?assessment of the neces
35、sity to increase the sound absorption in the room; ?qualitative estimation of the potential performance of screens installed in the room; ?calculation of the noise-immission levels to be expected when machines with known emission are operated at specified positions in the room. EN ISO 14257:2001 Lic
36、ensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:10:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 14257:2001 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:10:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTENRATIONAL TSANDADRISO 75241:(1002)E Acoustics Measurement and param
37、etric description of spatial sound distribution curves in workrooms for evaluation of their acoustical performance 1Scope This International Standard specifies a method for measuring the spatial sound distribution curve(s) of a given workroom. A method is given for determining, from the measured dat
38、a, two descriptors of the acoustical performance of a workroom regarding noise control: i.e. the excess of sound pressure level with respect to a free field, and the sound pressure level decay per distance doubling. This International Standard does not deal with assessment of the acoustical quality
39、with respect to speech communication or other psychological factors. This International Standard is applicable to workrooms of any shape and any dimensions provided that the number of microphone positions allows the regression calculation to be performed. 2Normative references The following normativ
40、e 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 publications do not apply. However, parties to agreements based on this International Standard are
41、 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 applies. Members of ISO and IEC maintain registers of currently valid International Standards.
42、ISO 3741, Acoustics Determination of sound power levels of noise sources using sound pressure Precision methods for reverberation rooms ISO 3744:1994, Acoustics Determination of sound power levels of noise sources using sound pressure Engineering method in an essentially free field over a reflecting
43、 plane ISO 3745, Acoustics Determination of sound power levels of noise sources using sound pressure Precision methods for anechoc and semi-anechoic rooms ISO 6926, Acoustics Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels
44、IEC 60651, Sound level meters IEC 60804, Integrating-averaging sound level meters IEC 61260, Electroacoustics Octave-band and fractional-octave-band filters 3Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 1 EN ISO 14257:2001 Licensed
45、 Copy: sheffieldun sheffieldun, na, Sat Nov 18 02:10:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 75241:(1002)E 2 ISO 1002 All rights rsedevre 3.1 sound pressure level Lp ten times the logarithm to the base 10 of the ratio of the square of the sound pressure, p, radiated by a sound source to th
46、e square of the reference sound pressure (p0= 20 Pa) NOTE 1The sound pressure level is expressed in decibels. NOTE 2The frequency weighting or the width of the frequency band used, and the time weighting (S, F or I, see IEC 60651), should be indicated. 3.2 sound power level LW ten times the logarith
47、m to the base 10 of the ratio of the sound power radiated by a sound source to the reference sound power (P0= 1012W) NOTE 1The sound power level is expressed in decibels. NOTE 2The frequency weighting or the width of the frequency band used should be indicated. For example, the A-weighted sound powe
48、r level is LWA. 3.3 spatial sound distribution curve curve which shows how the sound pressure level from a reference sound source decreases when the distance to the source increases NOTE 1Such curves are frequency dependent and characterize the acoustic properties of rooms. In some cases, several sp
49、atial sound distribution curves are necessary to characterize a room. From this curve and for a given range of distances from the source, two main quantities are determined: ?the rate of spatial decay of sound pressure levels per distance doubling (DL2), and ?the excess of sound pressure level (DLf). Three distance ranges are normally of interest: near, middle and far regions. These two quantities (DL2and DLf) are useful for assessing the acoustic quality of a room. NOTE 2Adapted from ISO 11690-1:1996, definition 3.4.11. 3.4 sound distrib