1、Environmental testing Part 2-64: Tests Test Fh:Vibration, broadband randomand guidanceBS EN 60068-2-64: 2008raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsNational forewordThis British Standard is the UK implementation of EN 6006
2、8-2-64:2008. Itis identical to IEC 60068-2-64:2008. It supersedes BS EN 60068-2 64:1995which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee GEL/104, Environmental conditions, classification and testing.A list of organizations represented on this committee ca
3、n be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application. BSI 2009ISBN 978 0 580 55878 8ICS 19.040Compliance with a British Standard cannot confer immunity fromlegal obligations.
4、This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60068-2-64:2008-2 2009February8EUROPEAN STANDARD EN 60068-2-64 NORME EUROPENNE EUROPISCHE NORM September 2008 C
5、ENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved w
6、orldwide for CENELEC members. Ref. No. EN 60068-2-64:2008 E ICS 19.040 Supersedes EN 60068-2-64:1994English version Environmental testing - Part 2-64: Tests - Test Fh: Vibration, broadband random and guidance (IEC 60068-2-64:2008) Essais denvironnement - Partie 2-64: Essais - Essai Fh: Vibrations al
7、atoires large bande et guide (CEI 60068-2-64:2008) Umgebungseinflsse - Teil 2-64: Prfverfahren - Prfung Fh: Schwingen, Breitbandrauschen (digital geregelt) und Leitfaden (IEC 60068-2-64:2008) This European Standard was approved by CENELEC on 2008-07-01. CENELEC members are bound to comply with the C
8、EN/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 obtained on application to the Central Secretariat or t
9、o any CENELEC 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 CENELEC member into its own language and notified to the Central Secretariat has the same status as the official
10、 versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Ro
11、mania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 60068-2-64:2008EN 60068-2-64:2008 - 2 - Foreword The text of document 104/456/FDIS, future edition 2 of IEC 60068-2-64, prepared by IEC TC 104, Environmental conditions, classification and methods of test, was submit
12、ted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60068-2-64 on 2008-07-01. This European Standard supersedes EN 60068-2-64:1994. The major changes with regard to EN 60068-2-64:1994 concern the removal of Method 1 and Method 2, replaced by a single method, and replacement of Ann
13、ex A with suggested test spectra and removal of Annex C. Also included in this revision is the testing of soft packed specimens. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop
14、) 2009-04-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2011-07-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60068-2-64:2008 was approved by CENELEC as a European Standard without any modifi
15、cation. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 61373 NOTE Harmonized as EN 61373:1999 (not modified). ISO/IEC 17025 NOTE Harmonized as EN ISO/IEC 17025:2005 (not modified). _ BS EN 60068-2-64:2008- 3 - EN 60068-2-64:2008 Annex
16、 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 applies. For undated references, the latest editio
17、n 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 60050-300 - 1)International Electrotechnical Vocabulary - Electrica
18、l and electronic measurements and measuring instruments - Part 311: General terms relating to measurements - Part 312: General terms relating to electrical measurements - Part 313: Types of electrical measuring instruments - Part 314: Specific terms according to the type of instrument - - IEC 60068-
19、1 -1)Environmental testing - Part 1: General and guidance EN 60068-119942)IEC 60068-2-6 -1)Environmental testing - Part 2-6: Tests - Test Fc: Vibration (sinusoidal) EN 60068-2-6 20082)IEC 60068-2-47 2005 Environmental testing - Part 2-47: Tests - Mounting of specimens for vibration, impact and simil
20、ar dynamic tests EN 60068-2-47 2005 IEC 60068-3-8 2003 Environmental testing - Part 3-8: Supporting documentation and guidance - Selecting amongst vibration tests EN 60068-3-8 2003 IEC 60068-5-2 -1)Environmental testing - Part 5: Guide to drafting of test methods - Terms and definitions EN 60068-5-2
21、 19992)IEC 60721-3 Series Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities EN 60721-3 Series IEC Guide 104 -1)The preparation of safety publications and the use of basic safety publications and group safety publications -
22、- ISO 2041 -1)Vibration and shock - Vocabulary - - 1)Undated reference. 2)Valid edition at date of issue. BS EN 60068-2-64:2008 2 60068-2-64 IEC:2008 CONTENTS INTRODUCTION.6 1 Scope.7 2 Normative references .7 3 Terms and definitions .8 4 Requirements for test apparatus.12 4.1 General .12 4.2 Basic
23、motion .12 4.3 Cross-axis motion .13 4.4 Mounting .13 4.5 Measuring systems13 4.6 Vibration tolerances 14 4.7 Control strategy.17 4.8 Vibration response investigation17 5 Severities .18 5.1 Test frequency range 18 5.2 RMS value of acceleration .18 5.3 Shape of acceleration spectral density curve.18
24、5.4 Test duration .19 6 Preconditioning 19 7 Initial measurements and functional performance test 19 8 Testing .19 8.1 General .19 8.2 Initial vibration response investigation.20 8.3 Low-level excitation for equalization prior to testing.20 8.4 Random testing .21 8.5 Final vibration response investi
25、gation21 9 Recovery21 10 Final measurements and functional performance21 11 Information to be given in the relevant specification .22 12 Information to be given in the test report 22 Annex A (informative) Standardized test spectra24 Annex B (informative) Guidance.30 Bibliography34 Figure 1 Tolerance
26、 bands for acceleration spectral density; initial and final slope (see B.2.3)14 Figure 2 Time history of stochastically excitation; probability density function with Gaussian (normal) distribution (Example with crest factor = 3, see also 3.14 and 4.6.2) .15 Figure 3 Statistical accuracy of accelerat
27、ion spectral density versus degrees of freedom for different confidence levels (see also 4.6.3) 16 BS EN 60068-2-64:200860068-2-64 IEC:2008 3 Table A.1 Categories for spectrum: transportation .24 Table A.2 Break points for spectrum: transportation.25 Table A.3 Categories for spectrum: stationary ins
28、tallation25 Table A.4 Break points for spectrum: stationary installation .26 Table A.5 Categories for spectrum: equipment in wheeled vehicles .27 Table A.6 Break points for spectrum: equipment in wheeled vehicles.28 Table A.7 Categories for spectrum: equipment in airplanes and helicopters .29 Table
29、A.8 Break points for spectrum: equipment in airplanes and helicopters 29 BS EN 60068-2-64:2008 6 60068-2-64 IEC:2008 INTRODUCTION This part of IEC 60068 deals with broadband random vibration testing intended for general application to components, equipment and other products, hereinafter referred to
30、 as ”specimens”, that may be subjected to vibrations of a stochastic nature. The methods and techniques in this standard are based on digital control of random vibration. It permits the introduction of variations to suit individual cases if these are prescribed by the relevant specification. Compare
31、d with most other tests, test Fh is not based on deterministic but on statistical techniques. Broad-band random vibration testing is therefore described in terms of probability and statistical averages. It is emphasized that random testing always demands a certain degree of engineering judgement, an
32、d both supplier and purchaser should be fully aware of this fact. The writer of the relevant specification is expected to select the testing procedure and the values of severity appropriate to the specimen and its use. The test method is based primarily on the use of an electrodynamic or a servo-hyd
33、raulic vibration generator with an associated computer based control system used as a vibration testing system. Annexes A and B are informative annexes giving examples of test spectra for different environmental conditions, a list of details to be considered for inclusion in specifications and guida
34、nce. BS EN 60068-2-64:200860068-2-64 IEC:2008 7 ENVIRONMENTAL TESTING Part 2-64: Tests-Test Fh: Vibration, broadband random and guidance 1 Scope This part of IEC 60068 demonstrates the adequacy of specimens to resist dynamic loads without unacceptable degradation of its functional and/or structural
35、integrity when subjected to the specified random vibration test requirements. Broadband random vibration may be used to identify accumulated stress effects and the resulting mechanical weakness and degradation in the specified performance. This information, in conjunction with the relevant specifica
36、tion, may be used to assess the acceptability of specimens. This standard is applicable to specimens which may be subjected to vibration of a stochastic nature resulting from transportation or operational environments, for example in aircraft, space vehicles and land vehicles. It is primarily intend
37、ed for unpackaged specimens, and for items in their transportation container when the latter may be considered as part of the specimen itself. However, if the item is packaged, then the item itself is referred to as a product and the item and its packaging together are referred to as a test specimen
38、. This standard may be used in conjunction with IEC 60068-2-47:2005, for testing packaged products. If the specimens are subjected to vibration of a combination of random and deterministic nature resulting from transportation or real life environments, for example in aircraft, space vehicles and for
39、 items in their transportation container, testing with pure random may not be sufficient. See IEC 60068-3-8:2003 for estimating the dynamic vibration environment of the specimen and based on that, selecting the appropriate test method. Although primarily intended for electrotechnical specimens, this
40、 standard is not restricted to them and may be used in other fields where desired (see Annex A). 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
41、edition of the referenced document (including any amendments) applies. IEC 60050-300: International Electrotechnical Vocabulary Electrical and electronic measurements and measuring instruments Part 311: General terms relating to measurements Part 312: General terms relating to electrical measurement
42、s Part 313: Types of electrical measuring instruments Part 314: Specific terms according to the type of instrument IEC 60068-1: Environmental testing Part 1: General and guidance IEC 60068-2-6: Environmental testing Part 2-6: Tests Test Fc: Vibration (sinusoidal) IEC 60068-2-47:2005, Environmental t
43、esting Part 2-47: Tests Mounting of specimens for vibration, impact and similar dynamic tests BS EN 60068-2-64:2008 8 60068-2-64 IEC:2008 IEC 60068-3-8:2003, Environmental testing Part 3-8: Supporting documentation and guidance Selecting amongst vibration tests IEC 60068-5-2: Environmental testing P
44、art 5-2: Guide to drafting of test methods Terms and definitions IEC 60721-3 (all parts), Classification of environmental conditions Part 3: Classification of groups of environmental parameters and their severities IEC Guide 104, The preparation of safety publications and the use of basic safety pub
45、lications and group safety publications ISO 2041: Vibration and shock Vocabulary 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. NOTE The terms used are generally defined in IEC 60050-300, IEC 60068-1, IEC 60068-2-6, and IEC 60068-5-2 and ISO 204
46、1. If a definition from one of those sources is included here, the derivation is indicated and departures from the definitions in those sources are also indicated. 3.1 cross-axis motion motion not in the direction of the stimulus; generally specified in the two axes orthogonal to the direction of th
47、e stimulus NOTE The cross-axis motion should be measured close to the fixing points. 3.2 actual motion motion represented by the wideband signal returned from the reference point transducer 3.3 fixing point part of the specimen in contact with the fixture or vibration table at a point where the spec
48、imen is normally fastened in service NOTE If a part of the real mounting structure is used as the fixture, the fixing points are taken as those of the mounting structure and not of the specimen. 3.4 control methods 3.4.1 single point control control method using the signal from the transducer at the
49、 reference point in order to maintain this point at the specified vibration level 3.4.2 multipoint control control method using the signals from each of the transducers at the checkpoints NOTE The signals are either continuously averaged arithmetically or processed by using comparison techniques, depending upon the relevant specification. See also 3.13. 3.5 gnstandard acceleration due to the earths gravity, which itself varies with altitude and ge
