1、BRITISH STANDARD BS EN ISO 10534-1:2001 Acoustics Determination of sound absorption coefficient and impedance in impedance tubes Part 1: Method using standing wave ratio The European Standard EN ISO 10534-1:2001 has the status of a British Standard ICS 91.120.20; 17.140 NO COPYING WITHOUT BSI PERMIS
2、SION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN ISO 10534-1:2001 This British Standard, having been prepared under the direction of the Health and Environment Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 2 November 2001 BSI
3、2 November 2001 ISBN 0 580 38636 8 National foreword This British Standard is the official English language version of EN ISO 10534-1:2001. It is identical with ISO 10534-1:1996. The UK participation in its preparation was entrusted to Technical Committee EH/1/6, Building acoustics, which has the re
4、sponsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-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
5、 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 all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Co
6、mpliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor rela
7、ted international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii and iii, a blank page, pages 1 to 20, the annex ZA page and a back c
8、over. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO105341 June2001 ICS17.140.01 Englishversion AcousticsDeterminationofsoundabsorptioncoeffi
9、cientand impedanceinimpedancestubesPart1:Methodusingstanding waveratio(ISO105341:1996) AcoustiqueDterminationdufacteurdabsorption acoustiqueetdelimpdanceacoustiquelaidedutube dimpdancePartie1:Mthodedutauxdondes stationnaires(ISO105341:1996) AkustikBestimmungdesSchallabsorptionsgradesund derImpedanzi
10、nImpedanzrohrenTeil1:Verfahrenmit Stehwellenverhltnis(ISO105341:1996) ThisEuropeanStandardwasapprovedbyCENon13May2001. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelis
11、tsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguagean
12、dnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTE
13、EFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2001CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO105341:2001EgaPe2 INESO014351:0210 Foreword ThetextoftheInternationalSt
14、andardfromTechnicalCommitteeISO/TC43“Acoustics“ofthe InternationalOrganizationforStandardization(ISO)hasbeentakenoverasanEuropeanStandard byTechnicalCommitteeCEN/TC126“Acousticpropertiesofbuildingproductsandofbuildings“,the secretariatofwhichisheldbyAFNOR. ThisEuropeanStandardshallbegiventhestatusof
15、anationalstandard,eitherbypublicationofan identicaltextorbyendorsement,atthelatestbyDecember2001,andconflictingnationalstandards shallbewithdrawnatthelatestbyDecember2001. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthe followingcountriesareboundtoimplementthisEur
16、opeanStandard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg, Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandtheUnitedKingdom. Endorsementnotice ThetextoftheInternationalStandardISO105341:1996hasbeenapprovedbyCENasaEuropean Standardwitho
17、utanymodification. NOTE:NormativereferencestoInternationalStandardsarelistedinannexZA(normative). ENISO105341:2001INTERNATIONAL STANDARD IS0 10534-l First edition 1996-I 2-l 5 Acoustics - Determination of sound absorption coefficient and impedance in impedance tubes - Part 1: Method using standing w
18、ave ratio Acoustique - Dgtermination du facteur dabsorption acoustique et de /imp f is the frequency; CO is the speed of sound. 35 . impedance in the reference plane, 2,: Ratio at the the the the v(O) the reference plane of the sound pressure p to sound particle velocity v: In general the wave numbe
19、r is complex, so ko. = ko - jko” zr = p/v 3.6 surface impedance, Z: Complex ratio of sound pressure p(O) to the normal component of sound particle velocity v(O) at the reference plane. k, is the real component (ko = 27c/ k,” is the imaginary component which is the at- tenuation constant in nepers pe
20、r metre. 3.7 surface admittance, G: Complex ratio of normal component of the sound particle velocity to the sound pressure p(O) in the reference plane. 3.15 phase of reflection (factor), : Results from the representation of the complex reflection factor by magnitude and phase: 3.8 surface admittance
21、, G,: Admittance component at, and normal to, the surface of the test object. r= r + jr“ = lri. ej = Irl (cos + jsin ) 3.9 characteristic impedance, Zo: Field impedance (in the direction of propagation) in a single plane wave: II J r = ,12 + y”2 di=arctanc 20 = Poco r r = I I r COS I/ r = r sin I I
22、where PO is the density of the medium (air); CO is the speed of sound in the medium. 1) To be published. (Revision of IS0 266:1975) 2 ENISO105341:2001 IS0 IS0 10534=1:1996(E) 3.16 working frequency range, f: Range within which measurements can be performed in a given impedance tube: Ji ff” where Ji
23、and fU are the lower and upper frequency limits, respectively. 3.17 test section: Section of the impedance tube with no higher modes, in which the standing wave can be explored. 3.18 installation section: Section of the impedance tube in which the test object is installed. 4 Principle The test objec
24、t is mounted at one end of a straight, rigid, smooth impedance tube which is a tight fit (see figure 1). The incident plane sinusoidal sound wave pi is generated by a loudspeaker at the other end of the tube. The superposition p = pi + pr of the incident wave pi with the wave reflected from the test
25、 object, pr, produces a standing wave pattern in the tube. The evaluation proceeds from the measured quantities (either in a linear or in a logarithmic scale) of the sound pressure amplitudes (p(x,i”) 1 at pressure minima (one or more), and Ip(x,) 1 at pressure maxima. These data are sufficient to d
26、etermine the sound ab- sorption coefficient. In addition, the distance x,i” 1 of the first sound pressure minimum from the reference plane at x = 0 (which is usually the plane where the surface of the test object is placed), and the sound wavelength Lo must be determined to give the reflec- tion fac
27、tor Y and the impedance Z or the admittance G = l/Z. 5 Fundamentals 5.1 General conditions The method of this part of IS0 10534 relies heavily on the fact that there exist only plane incident and re- flected waves propagating parallel to the tube axis in the test section of the tube (the section whe
28、re the standing wave pattern is explored). The generation of other wave forms (higher modes) shall be avoided (see annex B). It is further assumed that the sound wave propagates in the tube without attenuation. Cor- rections can be applied for residual attenuations due to friction and thermal losses
29、 at the tube walls. Methods for the determination of these corrections are given in annex A. 5.2 Formulae NOTE 1 The time factor e-t is omitted in the following formulae. The incident sound wave pi is assumed to be plane, harmonic in time with frequency f and angular fre- quency w = 271fi without at
30、tenuation (for a correction of attenuation, see annex A), and directed along the axis of the impedance tube (in the negative x-direction) pi(X) = poeikoX . . . k0 w 2?f =- =- . . . (2) co Co where the amplitude p. is arbitrary. The wave which is reflected from the test object hav- ing a reflection factor Y is then P,(X) = r * PO *e - jkox . . . (3) NOTE - The first pressure maximum to be measured shall normally be chosen to lie between the first two minima, as shown. Figure 1 - Standing wave pattern in a test tube ENISO105341:2001
