1、November 2011 Translation by DIN-Sprachendienst.English price group 15No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).I
2、CS 17.140.01!$vT“1834904www.din.deDDIN EN ISO 14257Acoustics Measurement and parametric description of spatial sound distributioncurves in workrooms for evaluation of their acoustical performance(ISO 14257:2001)English translation of DIN EN ISO 14257:2011-11Akustik Messung und Parametrisierung der S
3、challausbreitungskurven in Arbeitsrumen zumZweck der Beurteilung der akustischen Qualitt (ISO 14257:2001)Englische bersetzung von DIN EN ISO 14257:2011-11Acoustique Mesurage et dscription paramtrique des courbes de dcroissance sonore spatiale dansles locaux de travaux en vue de lvaluation de leur pe
4、rformance acoustique(ISO 14257:2001); Version Allemande de lEN ISO 14257:2001Traduction anglaise de DIN EN ISO 14257:2011-11SupersedesDIN EN ISO 14257:2002-03www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 3 pages311.11 DIN EN ISO 14257
5、:2011-11 2 A comma is used as the decimal marker. National foreword The International Standard ISO 14257:2001 upon which this European Standard is based was prepared by Technical Committee ISO/TC 43/SC 1 “Noise” upon the request of CEN/TC 211 “Acoustics”, with extensive German participation and taki
6、ng as a basis the English translation of VDI 3760 “Computation and measurement of sound propagation in workrooms”. The responsible German body involved in its preparation was the Normenausschuss Akustik, Lrmminderung und Schwingungstechnik im DIN und VDI (Acoustics, Noise Control and Vibration Engin
7、eering Standards Committee in DIN and VDI), Working Committee NA 001-02-03 AA Schallausbreitung und Lrmminderung in Gebuden, in Arbeitssttten und im Freien. No modifications have been made to EN ISO 14257:2001. In the German version of EN ISO 14257:2001, only editorial corrections and corrections of
8、 spelling errors relative to the English versions of EN ISO 14257:2001 and ISO 14257 have been made. Furthermore, in some parts of the text the German translation is more precise than the English versions of EN ISO 14257:2001 and ISO 14257. The DIN Standards corresponding to the International Standa
9、rds referred to in this document are as follows: ISO 3741 DIN EN ISO 3741 ISO 3744:1994 DIN EN ISO 3744:1995-11 (but see NOTE 1 in Annex NA) ISO 3745 DIN EN ISO 3745 ISO 6926 DIN ISO 6926 IEC 60651 DIN EN 60651 (but see NOTE 2 in Annex NA) IEC 60804 DIN EN 60804 (but see NOTE 3 in Annex NA) IEC 6126
10、0 DIN EN 61260 The German Standards are given in Annex NA “Bibliography”. Amendments This standard differs from DIN EN ISO 14257:2002-03 as follows: The following editorial errors have been corrected: a) In the (German) national section information has been added regarding those documents referred t
11、o in EN ISO 14247:2001 which have been withdrawn and/or replaced, and by which documents these have been replaced (see Bibliography, National Annex NA). b) The numbering of equations was incorrect in the German version of EN ISO 14257:2001, and consequently, the references within the text to these e
12、quations were incorrect. This has been corrected in the present German version (the English versions of both editions are correct). DIN EN ISO 14257:2011-11 3 The following technical errors have been corrected: a) In Equation (5) of the German version of EN ISO 14257 (incorrectly numbered Equation (
13、3) in the previous edition), the denominator was not squared, as it is in the English versions of EN ISO 14257:2001 and ISO 14257. This has been corrected in the current German version (both English versions are correct). b) In Equation (7) of the German version of EN ISO 14257 (incorrectly numbered
14、 Equation (5) in the previous edition), the index of the second term in the addition within the first parentheses was incorrectly given as “I” instead of “i1”, as it is in the English versions of EN ISO 14257:2001 and ISO 14257. This has been corrected in the current German version (both English ver
15、sions are correct). Previous editions DIN EN ISO 14257: 2002-03 DIN EN ISO 14257:2011-11 4 National Annex NA (informative) Bibliography DIN 45635-1, Measurement of noise emitted by machines Airborne noise emission Enveloping surface method Basic method, divided into 3 grades of accuracy DIN EN ISO 3
16、741, Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Precision methods for reverberation test rooms DIN EN ISO 3744:1995-11, Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Enginee
17、ring methods for an essentially free field over a reflecting plane NOTE 1 DIN EN ISO 3744:1995-11 has been revised. The current edition is DIN EN ISO 3744:2011-02, Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Engineering methods for an e
18、ssentially free field over a reflecting plane DIN EN ISO 3745, Acoustics Determination of sound power levels of noise sources using sound pressure Precision methods for anechoic and hemi-anechoic rooms DIN EN 60651, Sound level meters NOTE 2 In 2004-08 DIN EN 60651 was withdrawn and replaced by DIN
19、EN 61672-1, Electroacoustics Sound level meters Part 1: Specifications and DIN EN 61672-2, Electroacoustics Sound level meters Part 2: Pattern evaluation tests DIN EN 60804, Integrating-averaging sound level meters NOTE 3 In 2004-08 DIN EN 60804 was withdrawn and replaced by DIN EN 61672-1, Electroa
20、coustics Sound level meters Part 1: Specifications and DIN EN 61672-2, Electroacoustics Sound level meters Part 2: Pattern evaluation tests DIN EN 61260, Electroacoustics Octave-band and fractional-octave-band filters DIN ISO 6926, Acoustics Requirements for the performance and calibration of refere
21、nce sound sources used for the determination of sound power levels EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 14257October 2001ICS 13.140English versionAcoustics - Measurement and parametric description of spatialsound distribution curves in workrooms for evaluation of theiracoustical per
22、formance (ISO 14257:2001)Acoustique - Mesurage et dscription paramtrique descourbes de dcroissance sonore spatiale dans les locauxde travaux en vue de lvaluation de leur performanceacoustique (ISO 14257:2001)Akustik - Messung und Parametrisierung derSchallausbreitungskurven in Arbeitsrumen zum Zweck
23、 derBeurteilung der akustischen Qualitt 14257:2001)This European Standard was approved by CEN on 5 October 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alte
24、ration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained 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 translati
25、onunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Lux
26、embourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNG 2001 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No
27、. EN ISO 14257:2001 EManagement Centre: Avenue Marnix 17, B-1000 Brussels (ISOEN ISO 14257:2001 (E) 2 Contents PageForeword3Introduction .41 Scope 52 Normative references 53 Terms and definitions .54 Sound distribution in a room74.1 General74.2 Spatial sound distribution curves75 Measurement of the
28、spatial sound distribution curve.95.1 Specifications regarding the sound source used for the test 95.2 Measurement instrumentation .105.3 Measurement path and points115.4 Measurement procedure .125.5 Representation of the measured data .126 Parametric description of the measured spatial sound distri
29、bution curve in view of evaluation of the acoustical performance of workrooms136.1 General136.2 Distance ranges .136.3 Determination of the rate of spatial decay of sound pressure levels per distance doubling, DL2136.4 Determination of the excess of sound pressure level with respect to a reference s
30、ound distribution curve, DLf146.5 Evaluation of measured data167 Information to be recorded and reported16Annex A (normative) Performance requirements for the sound source to be used for the test 18Annex B (normative) Correction of measured sound distribution curves to account for differences in gro
31、und reflections and source directivity 20Annex C (informative) Example of use of this International Standard 21Bibliography 29DIN EN ISO 14257:2011-11 EN ISO 14257:2001 (E) 3 Foreword The text of the International Standard ISO 14257:2001 has been prepared by Technical Committee ISO/TC 43 “Acoustics”
32、 in collaboration with Technical Committee CEN/TC 211 “Acoustics”, 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 stan
33、dards shall be withdrawn at the latest by April 2002. According to 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
34、, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, 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. DIN EN ISO 14257:2011-11 EN ISO 14257:2001 (E)
35、 4 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 radiation as a function of the distance from t
36、he 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 sound pressure level) for the room in question.
37、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 necessity to increase the sound absorption in the room
38、; 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. DIN EN ISO 14257:2011-11 1 ScopeThis International Standard specifies a
39、method for measuring the spatial sound distribution curve(s) of a givenworkroom. A method is given for determining, from the measured data, two descriptors of the acousticalperformance of a workroom regarding noise control: i.e. the excess of sound pressure level with respect to a freefield, and the
40、 sound pressure level decay per distance doubling.This International Standard does not deal with assessment of the acoustical quality with respect to speechcommunication or other psychological factors.This International Standard is applicable to workrooms of any shape and any dimensions provided tha
41、t the numberof microphone positions allows the regression calculation to be performed.2 Normative referencesThe following normative documents contain provisions which, through reference in this text, constitute provisions ofthis International Standard. For dated references, subsequent amendments to,
42、 or revisions of, any of thesepublications do not apply. However, parties to agreements based on this International Standard are encouraged toinvestigate the possibility of applying the most recent editions of the normative documents indicated below. Forundated references, the latest edition of the
43、normative document referred to applies. Members of ISO and IECmaintain registers of currently valid International Standards.ISO 3741, Acoustics Determination of sound power levels of noise sources using sound pressure Precision methods for reverberation roomsISO 3744:1994, Acoustics Determination of
44、 sound power levels of noise sources using sound pressure Engineering method in an essentially free field over a reflecting planeISO 3745, Acoustics Determination of sound power levels of noise sources using sound pressure Precision methods for anechoc and semi-anechoic roomsISO 6926, Acoustics Requ
45、irements for the performance and calibration of reference sound sources used for thedetermination of sound power levelsIEC 60651, Sound level metersIEC 60804, Integrating-averaging sound level metersIEC 61260, Electroacoustics Octave-band and fractional-octave-band filters3 Terms and definitionsFor
46、the purposes of this International Standard, the following terms and definitions apply.5EN ISO 14257:2001(E)DIN EN ISO 14257:2011-11 3.1sound pressure levelLpten times the logarithm to the base 10 of the ratio of the square of the sound pressure, p, radiated by a soundsource to the square of the ref
47、erence sound pressure (p0=20Pa)NOTE 1 The sound pressure level is expressed in decibels.NOTE 2 The frequency weighting or the width of the frequency band used, and the time weighting (S, F or I, see IEC 60651),should be indicated.3.2sound power levelLWten times the logarithm to the base 10 of the ra
48、tio of the sound power radiated by a sound source to the referencesound power (P0=1012W)NOTE 1 The sound power level is expressed in decibels.NOTE 2 The frequency weighting or the width of the frequency band used should be indicated. For example, the A-weightedsound power level is LWA.3.3spatial sou
49、nd distribution curvecurve which shows how the sound pressure level from a reference sound source decreases when the distance tothe source increasesNOTE 1 Such curves are frequency dependent and characterize the acoustic properties of rooms. In some cases, severalspatial 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:Gbe the rate of spatial decay of sound pressure levels per
