1、 IEC 62459 Edition 1.0 2010-01 INTERNATIONAL STANDARD Sound system equipment Electroacoustical transducers Measurement of suspension parts IEC 62459:2010(E) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2010 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified,
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9、oacoustical transducers Measurement of suspension parts INTERNATIONAL ELECTROTECHNICAL COMMISSION R ICS 33.160.50 PRICE CODE ISBN 2-8318-1074-5 Registered trademark of the International Electrotechnical Commission colour inside 2 62459 IEC:2010(E) CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Norma
10、tive references .7 3 Terms and definitions .7 4 Test conditions.10 5 Clamping of the suspension part 10 5.1 General .10 5.2 Destructive measurement10 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
11、 measurement .11 6.1 Static measurement.11 6.2 Quasi-static measurement.11 6.3 Incremental dynamic measurement .11 6.4 Full dynamic measurement11 7 Static displacement x static (F dc ) .12 7.1 Characteristic to be specified 12 7.2 Method of measurement12 7.2.1 General .12 7.2.2 Test equipment12 7.2.
12、3 Procedure12 7.2.4 Presentation of results.13 8 Static stiffness K static (x static ) .13 8.1 Characteristic to be specified 13 8.2 Method of measurement13 8.3 Presentation of results 13 9 Lowest cone resonance frequency, f 0 .13 9.1 Characteristic to be specified 13 9.2 Method of measurement14 9.2
13、.1 General .14 9.2.2 Test equipment14 9.2.3 Procedure14 9.2.4 Presentation of results.15 10 Dynamic stiffness K(x ac ) .15 10.1 Characteristic to be specified 15 10.2 Method of measurement15 10.2.1 General .15 10.2.2 Test equipment15 10.2.3 Procedure16 10.2.4 Presentation of results.17 11 Coefficien
14、ts of the power series expansion of K(x)17 11.1 Characteristics to be specified.17 62459 IEC:2010(E) 3 11.2 Presentation of results 17 12 Effective stiffness K eff (x peak ).17 12.1 Characteristic to be specified 17 12.2 Method of measurement17 12.3 Presentation of results 18 13 Mechanical resistanc
15、e R .18 13.1 Characteristic to be specified 18 13.2 Method of measurement18 13.3 Presentation of results 18 Bibliography19 Figure 1 Measurement of static displacement 12 Figure 2 Measurement of lowest cone resonance f 0 .14 Figure 3 Pneumatic excitation of the suspension part.16 Figure 4 Magnitude r
16、esponse of the normalized transfer function, H(f)/H(0), versus frequency, f.17 4 62459 IEC:2010(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SOUND SYSTEM EQUIPMENT ELECTROACOUSTICAL TRANSDUCERS MEASUREMENT OF SUSPENSION PARTS FOREWORD 1) The International Electrotechnical Commission (IEC) is a wor
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27、t of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62459 has been prepared by IEC technical committee 100: Audio, video and multimedia systems and equipment. This first edition cancels and replaces the IEC/PAS 62459 publish
28、ed in 2006. It constitutes a technical revision. The main changes are listed below: descriptions of the methods of measurement are adjusted to the state of the technology; addition of Clauses 5 to 13; integration of Annex A “Code of practice” at the main part of the standard; overall textual review.
29、 62459 IEC:2010(E) 5 The text of this standard is based on the following documents: FDIS Report on voting 100/1625/FDIS 100/1648/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted i
30、n accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the pub
31、lication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The “colour inside” logo on the cover page of this publication indicates that it contains colours which are considered to be useful for
32、 the correct understanding of its contents. Users should therefore print this publication using a colour printer. 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 Int
33、ernational Standard 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 vis
34、co-elastic properties 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
35、suspension material 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 su
36、pport the communication between manufacturers of suspension parts and complete drive units. 62459 IEC:2010(E) 7 SOUND SYSTEM EQUIPMENT ELECTROACOUSTICAL TRANSDUCERS MEASUREMENT OF SUSPENSION PARTS 1 Scope This International Standard applies to the suspension parts of electroacoustic transducers (for
37、 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 design purposes and for quality control.
38、 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 uses both static and dynamic techniques.
39、 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 amendments) applies. IEC 60268-1, Sound system
40、 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 impregnated fabric 3.2 displacement x perpendic
41、ular direction at the inner rim of the suspension part 3.3 peak displacement x peakpeak 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 the suspension part and the inner clamp
42、ing parts at the neck of the suspension 8 62459 IEC:2010(E) 3.5 transfer function H(f) amplitude response given by X j Hf F j = () () ()(1) between the displacement spectrum X(j ) = FTx(t) and the force spectrum F(j ) = FTF(t) 3.6 dynamic stiffness K(x ac ) reciprocal of the dynamic compliance C(x a
43、c ); it is the ratio of instantaneous force F acto instantaneous displacement x ac,for an a.c. excitation signal at point x ac , given by the following equation () ac ac ac ac 1 () F Kx Cx x =(2) NOTE The dynamic stiffness K(x ac ) corresponds to the secant between origin and working point defined b
44、y x acin the force-displacement curve. 3.7 incremental stiffness K inc (x dc ) reciprocal of the incremental compliance C inc (x dc ); it is the ratio of a small a.c. force F acto the small a.c. displacement x acproduced by it at working point x dcunder steady-state condition as given by the followi
45、ng equation () ac inc dc inc dc ac 1 () F Kx Cx x =(3) NOTE The incremental stiffness K inc (x dc ) corresponds to the gradient at the working point defined by x dcin the force-deflection curve. 3.8 static stiffness K static (x dc ) reciprocal of the static compliance C static (x dc ); it is the rat
46、io of a d.c. force F dcand the d.c. displacement x dcproduced by it at the working point x dcunder steady-state condition; the static stiffness K static (x dc ) corresponds to the secant between origin and working point in the force-displacement curve, given by the following equation () dc static dc
47、 static dc dc 1 () F Kx Cxx =(4) 3.9 moving mass m defined by sc =+ mmm (5) where m sis the mass of the suspension part, m cis the additional mass of the inner clamping parts, is the clamping factor (with 0 1), describing the fraction of the suspension which contributes to the moving mass. 62459 IEC
48、:2010(E) 9 NOTE If factor is not known, the moving mass is approximated by using the total weight of the suspension part ( = 1) and ensuring that the mass, m c , of the inner clamping part dominates the moving mass, m (m c m s ). 3.10 resonance frequency f Rfrequency of an a.c. displacement x acat w
49、hich the restoring force, F K= K(x ac )x acof the suspension part equals the inertia of the moving mass, m,given by the following equation2 2 ) ( dt x d m x x K F ac ac ac K = =(6) 3.11 lowest cone resonance frequency f 0frequency at which the cone mass and suspension stiffness resonate NOTE The lowest cone resonance frequency can be approximated by off s f Kxm 0 1 2()(7) using the stiffness K(x off ) at the offset x offdue to gravity, th
