1、BRITISH STANDARD BS EN 60068-3-3: 1993 Incorporating Amendment No. 1 Environmental testing Part 3: Guidance Seismic test methods for equipments This Part should be read in conjunction with Part 1.1 General and guidance TheEuropean Standard EN 60068-3-3:1993 has the status of a British Standard UDC 6
2、21.3:620.178.3:620.193:550.34BSEN60068-3-3:1993 This British Standard, having been prepared under the direction of the General Electrotechnical Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 30 September 1991 BSI 03-1999 The following BS
3、I references relate to the work on this standard: Committee reference GEL/15 Draft for comment 81/23273 DC ISBN 0 580 20003 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Electrotechnical Standards Policy Committee (GEL/-) to
4、Technical Committee GEL/15, upon which the following bodies were represented: Directorate of Telecommunications EEA (the Association of Electronics, Telecommunications and Business Equipment Industries) Electronic Components Industry Federation Ministry of Defence National Supervising Inspectorate S
5、ociety of Environmental Engineers Society of Motor Manufacturers and Traders Limited The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Association of Manufacturers of Domestic Electrical Appliances BEAMA Ltd. British Telecommunications plc
6、Department of Trade and Industry (National Engineering Laboratory) Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) United Kingdom Atomic Authority Amendments issued since publication Amd. No. Date Comments 7842 July 1993 Indicated by a sideline in the marginBS EN 60068-3-3:1
7、993 BSI 03-1999 i Contents Page Committees responsible Inside front cover National foreword ii Introduction 3 Section 1. General 1 Object 3 2 General considerations 3 3 Definitions 3 4 Qualification considerations 6 5 Testing procedures 6 Section 2. General seismic class 6 Conditioning 7 7 Standard
8、amplitude conventional test method 8 8 Calculated amplitude test method 8 9 Testing parameters 10 10 Testing procedures 11 Section 3. Specific seismic class 11 Conditioning 11 12 Test wave selection 12 13 Test waves 12 14 Testing conditions 14 15 Single and multi-axis testing 17 Annex ZA (normative)
9、 Other international publications quoted in this standard with the references of the relevant European publications 27 Appendix A Flow charts for test selection 28 Figure 1 Typical envelope response spectrum 19 Figure 2 Types of response spectrum envelopes 20 Figure 3 Multifrequency response spectru
10、m with superimposed sine beats 21 Figure 4 Sequence of five sine beats with five cycles 21 Figure 5 Typical time-history 22 Figure 6 Wave amplification factors 23 Figure 7a Vibration amplitudes for seismic performance levels with cross-over frequencies at0.8Hz and1.6Hz (floor acceleration a f ) 24 F
11、igure 7b Vibration amplitudes for ground acceleration a gwith cross-over frequencies at0.8Hz and1.6Hz 25 Figure 8 Biaxial table along an inclined plane 26 Figure 9 Continuous sine 26 Table 1 Selection of test type 7 Table 2 Performance level 8 Table 3 Ground acceleration levels 9 Table 4 Recommended
12、 superelevation factors (K) 10 Table 5 Direction factors (D) 10 Table 6 Wave factor 10 Table 7 Typical damping ratios (percent of critical) 16 Publication(s) referred to Inside back coverBS EN 60068-3-3:1993 ii BSI 03-1999 National foreword This Section of BS 2011 has been prepared under the directi
13、on of the General Electrotechnical Standards Policy Committee. It is identical with IEC Publication68-3-3:1991 “Environmental testing Part3: Guidance Seismic test methods for equipments”, published by the International Electrotechnical Commission (IEC). In 1993 the European Committee for Electrotech
14、nical Standardization (CENELEC) accepted IEC68-3-3:1991 as European Standard EN60068-3-3:1993. As a consequence of implementing the European Standard this British Standard is renumbered as BSEN60068-3-3 and any reference to BS2011-4.3 should be read as a reference to BSEN 60068-3-3. The title of BS
15、2011 has been changed to “Environmental testing” to correspond with the change in the title of IEC Publication68. This change reflects the fact that IEC Publication68 and BS2011 are concerned with the whole subject of testing, and avoids any possible confusion over whether it is the “procedures” or
16、the “testing” that are basic. Amendments are not being issued to the other Parts of BS2011, but their titles are being changed when these Parts are revised. The Technical Committee has reviewed the provisions of ISO2041:1975 to which reference is made in the text, and has decided that they are accep
17、table for use in conjunction with this standard. A British Standard related to ISO2041:1975 is BS3015:1976 “Glossary of terms relating to mechanical vibration and shock”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are respons
18、ible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International standard a Corresponding British Standard BS 2011 Environmental testing IEC 68-1:1988 Part 1.1:1989 General and guidance (Identical) IEC 68
19、-2-6:1982 Part 2.1Fc:1983 Test Fc. Vibration (sinusoidal) (Identical) IEC 68-2-47:1982 Section 4.1:1983 Specification for mounting of components, equipment and other articles for dynamic tests (Identical) IEC 68-2-57:1989 Part 2.1Ff:1989 Test Ff. Vibration time-history method (Identical) IEC 68-2-59
20、:1990 Part 2.1Fe:1991 Test Fe and guidance. Vibration (sine-beat method) (Identical) a Undated in the text. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages2 to32, an inside back cover and a back cover. This standard has been upda
21、ted (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN60068-3-3 April1993 UDC 621.3:620.178.3:620.193:550.34 Supersedes HD 323.3.3 S1:1991 Descriptors: Environmenta
22、l testing, electricity, equipment, component, vibration, seismic test English version Environmental testing Part 3: Guidance Seismic test methods for equipments (IEC 68-3-3:1991) Essais denvironnement Troisime partie: Guide Mthodes dessai sismiques applicables aux matriels (CEI 68-3-3:1991) Umweltpr
23、fungen Teil 3: Leitfaden Seismische Prfverfahren fr Gerte (IEC 68-3-3:1991) This European Standard was approved by CENELEC on 1993-03-09. 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 nat
24、ional 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, German). A version
25、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, Denmark, Finland, Franc
26、e, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Cent
27、ral Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN 60068-3-3:1993 EEN60068-3-3:1993 BSI 03-1999 2 Foreword At the request of CENELEC Reporting Secretariat SR 50A, HD 323.3.3 S1:1991 (IEC 68-3-3:1991) was submitted to the CENELEC voting procedu
28、re for conversion into a European Standard. The text of the International Standard was approved by CENELEC as EN60068-3-3 on 9 March 1993. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, and Annex ZA is normative. latest date of
29、publication of an identical national standard (dop) 1994-03-01 latest date of withdrawal of conflicting national standards (dow) EN60068-3-3:1993 BSI 03-1999 3 Section 1. General Introduction Guidance is included in each of the three test methods referred to in this standard but it is specific to th
30、e test method. The guidance in this standard is directed towards choosing the appropriate test method and applying it to seismic testing. This standard is to be used in conjunction with IEC Publication 68-1. 1 Object This guide applies primarily to electrotechnical equipments but its application can
31、 be extended to other equipments and to components. The verification of the performance of an equipment by analysis or by a combination of testing and analysis may be acceptable but is outside the scope of this guide, which is restricted to verification based entirely upon data from dynamic testing.
32、 This guide deals solely with the seismic testing of a full size equipment which can be tested on a vibration table. The seismic testing of an equipment is intended to demonstrate its ability to perform its required function during and/or after the time it is subjected to the stresses and displaceme
33、nts resulting from an earthquake. The object of this guide is to present a range of methods of testing which, when prescribed by the relevant specification, can be applied to demonstrate the performance of equipments for which seismic testing is required with the main aim of achieving qualification.
34、 NOTEQualification by so-called “fragility-testing” is not considered to be within the scope of this guide which has been prepared to give generally applicable guidance on seismic testing and specifically on the use of IEC Publication 68-2 test methods. The choice of the method of testing can be mad
35、e according to the criteria described in this guide. The methods themselves are closely based on published IEC test methods. This guide is intended for use by manufacturers to substantiate, or by users to evaluate and verify, the performance of an equipment. 2 General considerations Two seismic clas
36、ses have been established: a general seismic class and a specific seismic class. Neither of these classes can be considered to be more demanding than the other. The difference between the two classes lies in the availability of and/or the accuracy in defining the characteristics of the seismic envir
37、onment. When high reliability safety equipment for a specified environment is required, such as safety related equipment in nuclear power plants, the use of precise data is necessary and, therefore, the specific seismic class is applicable and not the general seismic class. Appendix A contains a flo
38、w chart for the selection of the test class (general seismic class or specific seismic class) and four flow charts (A1 toA4) covering the possibilities discussed in this guide. To obtain the maximum advantage from this guide it is strongly recommended that the flow charts be studied very thoroughly.
39、 2.1 General seismic class This class covers equipments for which the relevant seismic motion does not result from a specific study taking into account the characteristics of the geographic location and of the supporting structure or building. In the case of equipments in this class, the seismic mot
40、ion is generally characterized by one datum which is a peak acceleration at the ground level. This acceleration is derived from the seismic data relative to the area of interest. When an equipment is not mounted at ground level, the transmissibility of the building and/or the supporting structure sh
41、ould be taken into account. 2.2 Specific seismic class This class covers the equipment for which the relevant seismic motion results from a specific study taking into account the characteristics of the geographic location and of the supporting structure or building. For equipment in this class, the
42、seismic motion is defined by response spectra (evaluated for different damping ratios) or by a time-history. 3 Definitions The terms used in this standard are generally defined in ISO Standard2041 or in IEC Publications68-1, 68-2-6, 68-2-57 and 68-2-59. Where, for the convenience of the reader, a de
43、finition from one of these sources is included here, the derivation is indicated and departures from the definitions in those sources are also indicated. The additional terms and definitions that follow are also applicable for the purpose of this standard.EN60068-3-3:1993 4 BSI 03-1999 3.1 assembly
44、two or more devices sharing a common mounting or supporting structure 3.2 bandpass at 3 dB frequency intervals defined by the points possessing an ordinate larger than or equal to times the maximum value of the plot (seeFigure 1) 3.3 basic response spectrum unmodified response spectrum defined by th
45、e characteristics of the building, its floor level, damping ratio, etc. and obtained from a specific ground motion (seeFigure 1) NOTEThe basic response spectrum is generally of the narrow band type at floor level. 3.4 broad-band response spectrum response spectrum that describes the motion indicatin
46、g that a number of interacting frequencies exist which must be treated as a whole (seeFigure 2c) NOTEThe bandwidth is normally greater than one octave. 3.5 critical frequency (definition technically equivalent to that in Sub-clause8.1 of IEC Publication68-2-6) frequencies at which: malfunctioning an
47、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. 3.6 crossover frequency (definition technically equivalent to that of ISO2041) frequency at which the characteristi
48、c of a vibration changes from one relationship to another NOTEFor example, a crossover frequency may be that frequency at which the vibration amplitude changes from a constant displacement value versus frequency to a constant acceleration value versus frequency. 3.7 damping (not identical with ISO20
49、41 definitions) generic term ascribed to the numerous energy dissipation mechanisms in a system. In practice, damping depends on many parameters, such as the structural system, mode of vibration, strain, applied forces, velocity, materials, joint slippage, etc. 3.7.1 critical damping minimum viscous damping that will allow a displaced system to return to its initial position without oscillation 3.7.2 damping ratio ratio of actual damping to critical damping in a system with viscous damping 3.8 direction factor factor
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