BS EN 62459-2011 Sound system equipment Electroacoustic transducers Measurement of suspension parts《音响系统设备 电声换能器 悬挂件的测量》.pdf

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1、BSI Standards PublicationSound system equipment Electroacoustic transducers Measurement of suspension partsBS EN 62459:2011BS EN 62459:2011Incorporating corrigendum November 2015BS EN 62459:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 62459:2011. It is i

2、dentical to IEC 62459:2010, incorporating corrigendum November 2015.The start and finish of text introduced or altered by corrigendum is indicated in the text by tags. Text altered by IEC corrigendum November 2015 is indicated in the text by .The UK participation in its preparation was entrusted to

3、Technical Committee EPL/100, Audio, video and multimedia systems and equipment.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its corr

4、ect application. The British Standards Institution 2016. Published by BSI Standards Limited 2016ISBN 978 0 580 93502 2ICS 33.160.50Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Stra

5、tegy Committee on 30 June 2011.Amendments/corrigenda issued since publicationDate Text affected30 April 2016 Implementation of IEC corrigendum November 2015EUROPEAN STANDARD EN 62459 NORME EUROPENNE EUROPISCHE NORM March 2011 CENELEC European Committee for Electrotechnical Standardization Comit Euro

6、pen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62459:2011 E ICS 33.160.50 English

7、version Sound system equipment - Electroacoustic transducers - Measurement of suspension parts (IEC 62459:2010) Equipements pour systmes lectroacoustiques - Transducteurs lectroacoustiques - Mesure des pices de suspension (CEI 62459:2010) Elektroakustische Gerte - Elektroakustische Wandler - Messung

8、 der Aufhngungsteile (IEC 62459:2010) This European Standard was approved by CENELEC on 2011-01-02. CENELEC 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.

9、 Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translat

10、ion under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Eston

11、ia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 62459:2011EN 62459:2011 - 2 - Foreword The text of document 1

12、00/1625/FDIS, future edition 1 of IEC 62459, prepared by IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62459 on 2011-01-02. Attention is drawn to the possibility that some of the elements of this docume

13、nt may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following dates were fixed: latest date by which the EN has to be implementedat national level by publication of an identicalnational standard or by endorsement (d

14、op) 2011-10-02 latest date by which the national standards conflictingwith the EN have to be withdrawn (dow) 2014-01-02 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 62459:2010 was approved by CENELEC as a European Standard without any modificati

15、on. _ BS EN 62459:2011- 3 - EN 62459:2011 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited app

16、lies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60268-1 - Sound syst

17、em equipment - Part 1: General HD 483.1 S2- BS EN 62459:2011 2 BS EN 62459:2011EN 62459:2011- 3 - EN 62459:2011 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable for the applicat

18、ion of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/

19、HD applies. Publication Year Title EN/HD Year IEC 60268-1 - Sound system equipment - Part 1: General HD 483.1 S2- BS EN 62459:2011 3 BS EN 62459:2011EN 62459:2011 2 62459 IEC:2010(E) CONTENTS INTRODUCTION.6 1 Scope.7 2 Normative references .7 3 Terms and definitions .7 4 Test conditions .10 5 Clampi

20、ng of the suspension part 10 5.1 General .10 5.2 Destructive measurement 10 5.3 Non-destructive measurement .10 5.4 Clamping position10 5.5 Guiding the inner clamping part.11 5.6 Reporting the clamping condition.11 6 Methods of measurement .11 6.1 Static measurement.11 6.2 Quasi-static measurement .

21、11 6.3 Incremental dynamic measurement .11 6.4 Full dynamic measurement11 7 Static displacement xstatic(Fdc) .12 7.1 Characteristic to be specified 12 7.2 Method of measurement 12 7.2.1 General .12 7.2.2 Test equipment12 7.2.3 Procedure12 7.2.4 Presentation of results.13 8 Static stiffness Kstatic(x

22、static) .13 8.1 Characteristic to be specified 13 8.2 Method of measurement 13 8.3 Presentation of results 13 9 Lowest cone resonance frequency, f0 .13 9.1 Characteristic to be specified 13 9.2 Method of measurement 14 9.2.1 General .14 9.2.2 Test equipment14 9.2.3 Procedure14 9.2.4 Presentation of

23、results.15 10 Dynamic stiffness K(xac) .15 10.1 Characteristic to be specified 15 10.2 Method of measurement 15 10.2.1 General .15 10.2.2 Test equipment15 10.2.3 Procedure16 10.2.4 Presentation of results.17 11 Coefficients of the power series expansion of K(x)17 11.1 Characteristics to be specified

24、.17 BS EN 62459:2011BS EN 62459:201162459 IEC:2010(E) 4 62459 IEC:2010(E) 3 11.2 Presentation of results 17 12 Effective stiffness Keff(xpeak).17 12.1 Characteristic to be specified 17 12.2 Method of measurement 17 12.3 Presentation of results 18 13 Mechanical resistance R .18 13.1 Characteristic to

25、 be specified 18 13.2 Method of measurement 18 13.3 Presentation of results 18 Bibliography19 Figure 1 Measurement of static displacement 12 Figure 2 Measurement of lowest cone resonance f0 .14 Figure 3 Pneumatic excitation of the suspension part.16 Figure 4 Magnitude response of the normalized tran

26、sfer function, H(f)/H(0), versus frequency, f.17 BS EN 62459:2011BS EN 62459:201162459 IEC:2010(E) 5 6 62459 IEC:2010(E) INTRODUCTION The properties of the suspension parts such as spiders and surrounds have a significant influence on the final sound quality of the loudspeaker. This International St

27、andard defines measurement methods and parameters required for development and quality-assurance by suspension-part manufacturers and loudspeaker manufacturers. Static and dynamic methods have been developed for measuring the suspension parts at small and high amplitudes. Due to the visco-elastic pr

28、operties of the suspension material (fabric, rubber, foam, paper) the measurement results depend on the measurement conditions and are not comparable between different methods. For example, the properties measured by static method significantly deviate from the dynamic behaviour of the suspension ma

29、terial when excited by an audio signal. This standard defines the terminology, the characteristics which should be specified and the way the results should be reported. The goal is to improve the reproducibility of the measurement, to simplify the interpretation of the results and to support the com

30、munication between manufacturers of suspension parts and complete drive units. BS EN 62459:2011BS EN 62459:201162459 IEC:2010(E) 6 62459 IEC:2010(E) 7 SOUND SYSTEM EQUIPMENT ELECTROACOUSTICAL TRANSDUCERS MEASUREMENT OF SUSPENSION PARTS 1 Scope This International Standard applies to the suspension pa

31、rts of electroacoustic transducers (for example, loudspeakers). It defines the parameters and measurement method to determine the properties of suspension parts like spiders, surrounds, diaphragms or cones before being assembled in the transducer. The measurement results are needed for engineering d

32、esign purposes and for quality control. Furthermore, this method is intended to improve the correlation of measurements between suspension-part manufacturers and loudspeaker manufacturers. The measurement methods provide parameters based on linear and nonlinear modelling of the suspension part and u

33、ses both static and dynamic techniques. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendme

34、nts) applies. IEC 60268-1, Sound system equipment Part 1: General 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 suspension part surround of the cone made of rubber, foam, paper and fabric and the spider which is usually made out of impregna

35、ted fabric 3.2 displacement x perpendicular direction at the inner rim of the suspension part 3.3 peak displacement xpeakpeak value of the displacement occurring during a dynamic measurement at resonance frequency3.4 driving force F total effect of the restoring force, friction and inertia of both t

36、he suspension part and the inner clamping parts at the neck of the suspension BS EN 62459:2011BS EN 62459:201162459 IEC:2010(E) 7 8 62459 IEC:2010(E) 3.5 transfer function H(f) amplitude response given by X jH fF j = ( )( ) ( ) (1)between the displacement spectrum X(j) = FTx(t) and the force spectru

37、m F(j) = FTF(t) 3.6 dynamic stiffness K(xac) reciprocal of the dynamic compliance C(xac); it is the ratio of instantaneous force Facto instantaneous displacement xac,for an a.c. excitation signal at point xac, given by the following equation ( )acacac ac1 ( )FK x C x x= = (2)NOTE The dynamic stiffne

38、ss K(xac) corresponds to the secant between origin and working point defined by xacin the force-displacement curve. 3.7 incremental stiffness Kinc(xdc) reciprocal of the incremental compliance Cinc(xdc); it is the ratio of a small a.c. force Facto the small a.c. displacement xacproduced by it at wor

39、king point xdcunder steady-state condition as given by the following equation ( )acinc dcinc dc ac1( )FK x C x x= = (3)NOTE The incremental stiffness Kinc(xdc) corresponds to the gradient at the working point defined by xdcin the force-deflection curve. 3.8 static stiffness Kstatic(xdc) reciprocal o

40、f the static compliance Cstatic(xdc); it is the ratio of a d.c. force Fdcand the d.c. displacement xdcproduced by it at the working point xdcunder steady-state condition; the static stiffness Kstatic(xdc) corresponds to the secant between origin and working point in the force-displacement curve, giv

41、en by the following equation ( )dcstatic dcstatic dc dc1( )FK x C x x= = (4)3.9 moving mass m defined by s c= +m m m (5)where msis the mass of the suspension part, mcis the additional mass of the inner clamping parts, is the clamping factor (with 0 ms). 3.10 resonance frequency fRfrequency of an a.c

42、. displacement xacat which the restoring force, FK= K(xac)xacof the suspension part equals the inertia of the moving mass, m,given by the following equation22)( dtxdmxxKFacacacK = (6)3.11 lowest cone resonance frequency f0frequency at which the cone mass and suspension stiffness resonate NOTE The lo

43、west cone resonance frequency can be approximated by off sfK x m 0 12 ( ) (7)using the stiffness K(xoff) at the offset xoffdue to gravity, the clamping factor and the cone mass ms. 3.12 effective stiffness Keffstiffness given by ( )eff peak RK x f m= 2( ) 2 (8)describing the conservative properties

44、of the suspension part performing a vibration at the resonance frequency, fR, using the moving mass, m NOTE The effective stiffness, Keff(xpeak), or the reciprocal, compliance, Ceff(xpeak) = 1/Keff(xpeak), are integral measures of the corresponding non-linear parameters, K(x) and C(x), in the workin

45、g range used, defined by the peak value, xpeak. The effective parameters are directly related to the resonance frequency and may be measured with minimal equipment. However, the effective parameters can only be compared if the measurements are made at the same peak displacement, xpeak.3.13 loss fact

46、or Q factor estimated by the ratio R dcH fQ H f= ( )( ) (9)between the magnitude of the transfer function, H(fR), at resonance frequency, fR, and the magnitude of the transfer function, H(fdc), at very low frequencies, fdc(with fdc2), the transfer function, H(f), has a distinct maximum (peak) at the

47、 resonance frequency, fR. 3.14 mechanical resistance R given by Rf mR Q= 2 (10)BS EN 62459:2011BS EN 62459:201162459 IEC:2010(E) 9 IEC 62459:2010/COR1:2015 1 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ IEC 62459 Edition 1.0 2010-01 Sound system equipment Electroacoustical transducers Measur

48、ement of suspension parts CORRIGENDUM 1 3.11 lowest cone resonance frequency Replace the existing Formula (7) by the following new Formula: soff0)21mx(7)6.3 Incremental dynamic measurement Replace the existing first sentence by the following: This technique for measuring the incremental stiffness Ki

49、nc(xdc) according to Equation (3) uses a superposition of a d.c. signal of certain magnitude (for example, constant restoring force Fdcgenerating a d.c. position xdc) and a small a.c. signal (e.g. restoring force Fac) as stimulus and measures the a.c. response of the suspension part (e.g. the a.c. part of the displacement xac) under steady-state condition. 6.4 Full dynamic measurement Replace the existing paragraph by the following: Thi