1、BRITISH STANDARD BS EN 60068-2-81: 2003 Environmental testing Part 2-81: Tests Test Ei: Shock Shock response spectrum synthesis The European Standard EN 60068-2-81:2003 has the status of a British Standard ICS 19.040 BS EN 60068-2-81:2003 This British Standard, having been prepared under the directi
2、on of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee on 28 October 2003 BSI 28 October 2003 ISBN 0 580 42805 2 National foreword This British Standard is the official English language version of EN 60068-2-81:2003. It is identical with IEC 60068-2
3、-81:2003. The UK participation in its preparation was entrusted to Technical Committee GEL/104, Environmental testing, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which impl
4、ement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication do
5、es not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee a
6、ny enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related 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 title page, pages 2 to 36, an
7、inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 60068-2-81 NORME EUROPENNE EUROPISCHE NORM October 2003 CENELEC European Committee for E
8、lectrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. R
9、ef. No. EN 60068-2-81:2003 E ICS 19.040 English version Environmental testing Part 2-81: Tests Test Ei: Shock Shock response spectrum synthesis (IEC 60068-2-81:2003) Essais denvironnement Partie 2-81: Essais Essai Ei: Chocs Synthse du spectre de rponse au choc (CEI 60068-2-81:2003) Umweltprfungen Te
10、il 2-81: Prfungen Prfung Ei: Schocken Synthese des Schockantwortspektrums (IEC 60068-2-81:2003) This European Standard was approved by CENELEC on 2003-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
11、 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 to any CENELEC member. This European Standard exists in three official versions (English, French,
12、 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 versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cze
13、ch Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EN 66008-2-182:300 - - 2 Foreword The text of document 104/306/FDIS, future edition 1 of IEC
14、 60068-2-81, prepared by IEC TC 104, Environmental conditions, classification and methods of test, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60068-2-81 on 2003-10-01. The following dates were fixed: latest date by which the EN has to be implemented at national
15、level by publication of an identical national standard or by endorsement (dop) 2004-07-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2006-10-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ ar
16、e given for information only. In this standard, annex ZA is normative and annexes A, B, C and D are informative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60068-2-81:2003 was approved by CENELEC as a European Standard without any modification
17、. _ Page2 EN60068281:2003-86006-218 3002:CEI 3 CONTENTS 1 Scope.5 2 Normative references5 3 Terms and definitions .5 4 Requirements for test apparatus .10 4.1 Basic motion10 4.2 Cross-motion.10 4.3 Signal tolerance.10 4.4 Measuring system10 5 Requirements for testing.11 5.1 Test control.11 5.2 Toler
18、ances on SRS11 5.3 Calculation of test SRS11 5.4 Algorithms for calculation of SRS.12 5.5 Test frequency range.12 5.6 Mounting.12 6 Severities.13 6.1 Required SRS13 6.2 Duration of the synthesized time-history.13 6.3 Number of repetitions 14 6.4 Test frequency range.14 6.5 Number of high peaks in a
19、calculated response time-history of a single- degree-of-freedom system .14 7 Preconditioning.14 8 Initial measurements.15 9 Testing.15 9.1 General.15 9.2 Vibration response investigation.15 9.3 Synthesis of the test time-history .16 9.4 Testing with synthesized test time-histories17 10 Intermediate
20、measurements18 11 Recovery18 12 Final measurements .18 13 Information to be given in the relevant specification.18 14 Information to be given in the test report .19 Annex A (informative) Test time history General background information .23 Annex B (informative) Parameters for use in synthesizing a t
21、est time-history 26 Annex C (informative) How to synthesize a test time-history .30 Annex D (informative) Recommended frequency ranges for test SRS 34 Bibliography36 Page3 EN60068281:2003 60068-2-81 IEC:2003 3 COTNENTS 1 Scepo. 5 roN 2mvita e refercnese5 3 Termsfed dna itinisno .5 4 riuqeRemstnef or
22、set rappa tsuta . 01 saB 1.4ic monoit 01 C 2.4rsos-monoit. 01langiS 3.4 torelcnae. 01 saeM 4.4ru gni sysmet 01 5 riuqeRemstnef orset gnit. 11 T 1.5es t cortnol. 112.5 TorelcnaseSRS no 11 claC 3.5 noitalu ofset SRS t 114.5 roglAmhtisf orc aclo noitalufSRS . 215.5 Tesf trcneuqeyr aegn. 21 gnitnuoM 6.5
23、. 21 veS 6eriseit. 31 riuqeR 1.6SRS de 312.6 ruDo noitafs eht ytnsehzimit dee-hsiroty. 313.6 muNrebo fr esnoititep 414.6 Tesf trcneuqeyr aegn. 415.6 muNrebo fkaep hgih sc a ni aclr detaluessnopmit e-esihroty ofs a i-elgn rged-eeof-frmodees ysmet . 41 P 7rceidnogninoit. 41laitinI 8 mesarumestne.51 T
24、9esgnit. 51 G 1.9erenla. 51 rbiV 2.9 noita ressnopsevni eti.noitag 513.9 Sysehtnsio f eht setmit te-hsiroty . 614.9 Testw gniis htysehtnziset demit te-hsirotise 71 retnI 01m etaide mesarumestne 81 ceR 11overy 81laniF 21 mesarumestne . 8131 fnIromvig eb ot noitat ni nehr eevels tnapceficioitan. 8141
25、fnIrom nevig eb ot noitaset eht nir teropt . 91Anxen( A ifnroma)evit Testmit esih troyG erencab lakrgfni dnuoormnoita . 32 xennA( B ifnrom)evitaraP maretesf oru ss ni eysehtnzit a gniesmit te-hsiroty 62 xennA( C ifnrom)evitawoH s ot ysehtnziset a et mite-hsiroty . 03 Annex ZA (normative) Normative r
26、eferences to international publications with their Biilbgorhpay36 Pa3eg E3002:18286006N 60068-2-81 IEC:2003 3 COTNENTS 1 Scepo. 5 roN 2mvita e refercnese5 3 Termsfed dna itinisno .5 4 riuqeRemstnef orset rappa tsuta . 01 saB 1.4ic monoit 01 C 2.4rsos-monoit. 01langiS 3.4 torelcnae. 01 saeM 4.4ru gni
27、 sysmet 01 5 riuqeRemstnef orset gnit. 11 T 1.5es t cortnol. 112.5 TorelcnaseSRS no 11 claC 3.5 noitalu ofset SRS t 114.5 roglAmhtisf orc aclo noitalufSRS . 215.5 Tesf trcneuqeyr aegn. 21 gnitnuoM 6.5. 21 veS 6eriseit. 31 riuqeR 1.6SRS de 312.6 ruDo noitafs eht ytnsehzimit dee-hsiroty. 313.6 muNrebo
28、 fr esnoititep 414.6 Tesf trcneuqeyr aegn. 415.6 muNrebo fkaep hgih sc a ni aclr detaluessnopmit e-esihroty ofs a i-elgn rged-eeof-frmodees ysmet . 41 P 7rceidnogninoit. 41laitinI 8 mesarumestne.51 T 9esgnit. 51 G 1.9erenla. 51 rbiV 2.9 noita ressnopsevni eti.noitag 513.9 Sysehtnsio f eht setmit te-
29、hsiroty . 614.9 Testw gniis htysehtnziset demit te-hsirotise 71 retnI 01m etaide mesarumestne 81 ceR 11overy 81laniF 21 mesarumestne . 8131 fnIromvig eb ot noitat ni nehr eevels tnapceficioitan. 8141 fnIrom nevig eb ot noitaset eht nir teropt . 91corresponding European publications . .35 Anxen( B if
30、nrom)evitaraP maretesf oru ss ni eysehtnzit a gniesmit te-hsiroty 62 xennA( C ifnrom)evitawoH s ot ysehtnziset a et mite-hsiroty . 03 xennA( D ifnrom)evitaceR momf dednercneuqeyr asegnf orset SRS t 43Biilbgorhpay36 Pa3eg E3002:18286006N -86006-2 18 3002:CEI 3 COTNENTS 1 Scope.5 2 Normative reference
31、s5 3 Termsand def initions .5 4 Requirements for test apparatus .10 4.1 Basic motion10 4.2 Cross-motion.10 4.3 Signal tolerance.10 4.4 Measruing system10 5 Requirements for tesingt.11 5.1 Test cntrool.11 5.2 Tolerances on SRS11 5.3 Calc ulation fo test SRS11 5.4 rAlgoithms forc alcofulation SRS.12 5
32、.5 Test frequency rgean.12 5.6 Mounting.12 6 Severities.13 6.1 RequirSed SR13 6.2 rDufation othe s yntsheized time-history.13 6.3 mNuberf o repetitions 14 6.4 Test frequency rgean.14 6.5 mNuberf o high peaks in a calcrulated seponse time-shitoryfo s ai-ngle degree-fo-freedom system .14 r7 Pceonditio
33、ning.14 8 Initial maseurements.15 9 Tesgtin.15 9.1 General.15 9.2 Vibr ation rseponse investi.gation15 9.3 Synthesisf othe tesmt tie-history .16 9.4 Tseting with sysntheized test time-histories17 10 Interm ediate maseurements18 11 Recovery18 12 Final measurements .18 13 Information to be given in te
34、 rhleveant specification.18 14 Information to be given in the test rporet .19 Axnen( A ifnroma)evit Testmit esih troyG erencab lakrgfni dnuoormnoita . 32 xennA B (ifnromative) Paramreets fros u in seynthesizing a test time-history 26 Annex C (ifnromative) How to synthesize a test mtie-history .30 xe
35、nnA AZ rieht htiw snoitacilbup lanoitanretni ot secnerefer evitamroN )evitamron( bliiBography36 ge3aP N60068281:2003E-86006-218 3002:CEI 4 Figure 1 Example of a typical response of an oscillator excited by a specific time- history (specified threshold value of 70 %).20 Figure 2 Example of identifica
36、tion of the peaks of the response higher than a specified (70 %) threshold value 20 Figure 3 Typical logarithmic plot of a required response spectrum 21 Figure 4 Typical time-history.21 Figure 5 Flow chart for testing with synthesized test time-histories 9.4 22 Figure B.1 Strong part of the SRS .29
37、Table D.1 Examples of test frequency range.34 Page4 EN60068281:2003-86006-218 3002:CEI 5 ENVIRONMENTAL TESTING Part 2-81: Tests Test Ei: Shock Shock response spectrum synthesis 1 Scope This part of IEC 60068 specifies tests using a synthesized shock response spectrum (SRS). It is intended for genera
38、l application to specimens when simulation of transient excitation of a complex nature is required. 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 late
39、st edition of the referenced document (including any amendments) applies. IEC 60068-1:1988, Environmental testing Part 1: General and guidance IEC 60068-2-6:1995, Environmental testing Part 2: Tests Test Fc: Vibration (sinusoidal) IEC 60068-2-27:1987, Basic environmental testing procedures Part 2: T
40、ests Test Ea and guidance: Shock IEC 60068-2-47:1999, Environmental testing Part 2-47: Test methods Mounting of components, equipment and other articles for vibration, impact and similar dynamic tests IEC 60068-2-57:1999, Environmental testing Part 2-57: Tests Test Ff: Vibration Time- history method
41、 IEC 60068-2-64:1993, Environmental testing Part 2: Test methods Test Fh: Vibration, broad-band random (digital control) and guidance ISO 266:1997, Acoustics Preferred frequencies ISO 2041:1990, Vibration and shock Vocabulary 3 Terms and definitions For the purposes of this document, the terms and d
42、efinitions given in ISO 2041, IEC 60068-1, IEC 60068-2-6, IEC 60068-2-27, IEC 60068-2-57 and IEC 60068-2-64, together with the following definitions, apply. 3.1 3 dB bandwidth frequency bandwidth between two points in a frequency response function which is 0,707 of the maximum response when associat
43、ed with a single resonance peak Page5 EN60068281:2003-86006-218 3002:CEI 6 3.2 critical damping minimum viscous damping that will allow a displaced system to return to its initial position without oscillation in the shortest time possible 3.3 critical frequency frequencies at which malfunctioning an
44、d/or deterioration of performance of the specimen which are dependent on vibration are exhibited, and/or mechanical resonances and/or other response effects occur, for example chatter 3.4 damping generic term ascribed to the numerous energy dissipation mechanisms in a system. In practice, damping de
45、pends on many parameters, such as the structural system, mode of vibration, strain, applied forces, velocity, materials, joint slippage, etc. 3.5 damping ratio ratio of actual damping to critical damping in a system with viscous damping 3.6 decibel dB relation between magnitudes written in a logarit
46、hmic form: = 0 X X L 10 20log (dB) where L is the logarithmic value in dB; X/X 0 is the relation between magnitudes X and X 03.7 fixing point part of the specimen in contact with the fixture or vibration table at a point where the specimen is normally fastened in service NOTE If a part of the real m
47、ounting structure is used as the fixture, the fixing points are taken as those of the mounting structure and not of the specimen. 3.8 g nstandard acceleration due to the earths gravity, which itself varies with altitude and geographical latitude NOTE For the purposes of this standard, the value of g
48、 nis rounded up to the nearest whole number, that is, 10 m/s. 3.9 Hanning window weighting function for time-histories that forces the start and the end of the time-history to a zero value in the selected time window. It has the shape of a cosine bell NOTE See ISO 18431-2 for a more detailed definit
49、ion. Page6 EN60068281:2003-86006-218 3002:CEI 7 3.10 high-frequency asymptote HFA high-frequency asymptotic value of the SRS curve (see Figure 3) NOTE 1 The SRS high-frequency asymptote is of practical significance as it represents the largest peak value of the excitation time-history. This is not to b
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