1、= 3404583 00b27b3 Y19 EUROPEAN STANDARD EN 6006833 A NORNE EUR0PEE“E EXJROP- NORM April 1993 4 UDC 621.3 : 620.178.3 : 620.193 : 550.34 Supersedes HD 323.3.3 S1 : 1991 Descriptors: Environmental testing, electricity, equipment, component, vibration, seismic test English version Enviromental testing
2、Part 3: Guidance Seismic test methods for equipments (IEC 68-3-3 : 1991) Essais denvironnement Umweltprufungen Troisime partie: Guide Mthodes dessai sismiques applicables aux (CE1 6833 : 1991) Teil 3 Leitfaden Seismische prufverfaiu-en fllr Gerte matriels (IEC 6833 : 1991) This European Standard was
3、 approved by CENELEC on 19930309. CENELEC members are bound to comply with the CENICENELEC internai 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 n
4、ational standards may be obtained on application to the Central Secretariat or to any CENELEC member. “his European Standard exkh in three officiai versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own langua
5、ge 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, Finiand, France, Germany, Greece, Iceland, Ireland, Itaiy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Swi
6、tzerland and United Kingdom. CENELEC European Committee for Electxotechnicai Standardization Comit Europen de Normahation Electrotechnique Europaisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1993 Copyright reserved to CENELEC members Ref. No.
7、EN 6006833 : 1993 E COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesA Page 2 EN 60068-3-3 : 1993 Foreword At the request of CENELEC Reporting Secretariat SR HIA, HD 323.3.3 S1: 1991 (nilC 69-33 : 1991) was submitted to the CENELEC voting proc
8、edure for conversion into a European Standard. The text of the Intedonal Standard was approved by CENELEC as EN 6006833 on 9 March 1993. The following dates were fixed: - latest date of publication of an identical national standard (dop) 1-1 - latest date of withdrawal of nflictingnatinalstandards (
9、dow) - Annexes designated normative are part of the body of the standard. in this standard, and annex ZA is nonnative. COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling ServicesW 3404583 0062765 291 D * a BS 2011 : Section 4.3 : 1991 Contents , Page Na
10、tional foreword Inside front page Committees responsible Back page Introduction 1 Guide Section one. General 1 Object 1 2 General Considerations 2 3 Definitions 2 4 Qualification considerations 6 5 Testing procedures 7 6 Conditioning 9 7 Standard amplitude conventional test method 10 8 Calculated am
11、plitude test method 11 9 %sting parameters 14 10 Rsting procedures 15 Section three. Specific seismic class 11 Conditioning 17 12 Rst wave selection 17 13 kst waves 19 14 %sting conditions 22 15 Single and multi-axis testing 27 Appendix A Flow charts for test selection 38 Tables 1 Selection of test
12、type 9 2 Performance level 10 3 Ground acceleration levels 12 4 Recommended superelevation factors (K) 13 Section two. General seismic class 5 Direction factors (D) 13 6 Wave factor 15 7 Typical damping ratios (percent of critical) 25 1 Typical envelope response spectrum 3 o 2 Types of response spec
13、trum envelopes 31 3 Multifrequency response spectrum with superimposed sine beats 3 2 5 Typical time-history 3 3 6 Wave amplification factors 34 Figures 4 Sequence of five sine beats with five cycles 3 2 7a 7b Vibration amplitudes for seismic performance levels with cross-over Vibration amplitudes f
14、or ground acceleration ug with cross-over frequencies at. 0.8 Hz and 1.6 Hz (floor acceleration af) frequencies at 0.8 Hz and 1.6 Hz 35 36 37 9 Continuous sine Annex ZA (normative) ther intemationai publications quoted in this standard witl- the references of the relevant European publications. i 8
15、Biaxial table along an inclined plane 3 7 - . - . . A - COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services3404583 0062766 128 68-3-3 O IEC ENVI RONMENTAL TESTING Part 3: Guidance Seismic test methods for equipments Introduction Guidance is incl
16、uded in each of the three test methods referred to in this standard but it is specific to the 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.
17、SECTION ONE- GENERAL 1 Object This guide applies primarily to electrotechnical equipments but its appli- cation can 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
18、outside the scope of this guide, which is restricted to verification based entirely upon data from dynamic testing. 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 a
19、bility to perform its required function during and/or after the time it is subjected to the stresses and displacements 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 demon- str
20、ate the performance of equipments for which seismic testing is required with the main aim of achieving qualification. NOTE - Qualification by so-called “fragility-testing“ is not con- sidered to be within the scope of this guide which has been prepared to give generally applicable guidance on seismi
21、c testing and specifically on the use of IEC Publication 68-2 test methods. The choice of the method of testing can be made 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 su
22、bstantiate, or by users to evaluate and verify, the performance of an equipment. 1 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services3404583 00627b7 Ob4 P 68-3-3 0 IEC 2 General considerations Two seismic classes have been established: a genera
23、l 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 charac- teristics of the seismic environment. When high reliability saf
24、ety 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 flow chart for the selection of the
25、test class (general seismic class or specific seismic class) and four flow charts (Al to A4) 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. 2.1 General seismic class This
26、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 eguipments in this class, the seismic motion is generally characterized b
27、y 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 should be taken into account. 2.2
28、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 seismic motion is defined by res
29、ponse spectra (evaluated for different damping ratios) or by a time-history. 3 Definitions The terms used in this standard are generally defined in IS0 Standard 2041 or in IEC Publications 68-1, 68-2-6, 68-2-57 and 68-2-59. Where, for the convenience of the reader, a definition from one of these sou
30、rces 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. 2 COPYRIGHT European Committee for Electrotechnical StandardizationLicens
31、ed by Information Handling Services3404583 0062768 TTO 68-3-3 IEC 3.1 assembly: Two or more devices sharing a common mounting or sup- porting structure. 3.2 bandpass at 3 dB: Frequency intervals defined by the points posses- sing an ordinate larger than or equal to Jz/2 times the maximum value of th
32、e plot (see Figure 1). 3.3 basic response spectrum: Unmodified response spectrum defined by the characteristics of the building, its floor level, damping ratio, etc. and obtained from a specific ground motion (see Figure 1). NOTE - The basic response spectrum is generally of the narrow band type at
33、floor level. 3.4 broad-band response spectrum: Response spectrum that describes the motion indicating that a number of interacting frequencies exist which must be treated as a whole (see Figure 2c). NOTE - The bandwidth is normally greater than one octave. 3.5 critical frequency (definition technica
34、lly equivalent to that in Sub-clause 8.1 of IEC Publication 68-2-6) : Frequencies at which: - malfunctioning and/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.
35、6 crossover frequency (definition technically equivalent to that of IS0 2041) : Frequency at which the characteristic of a vibration changes from one relationship to another. NOTE - For example, a crossover frequency may be that frequency at which the vibration amplitude changes from a constant disp
36、lacement value versus frequency to a constant acceleration value versus frequency. 3.7 damping (not identical with IS0 2041 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, m
37、ode 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 w
38、ith viscous damping. 3.8 direction factor: Factor taking account of the difference in magnitude at ground level that normally exists between the horizontal and vertical accelerations resulting from earthquakes. 3 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Informatio
39、n Handling Services3404583 O062769 - 937 - - t 68-3-3 0 IEC 3.9 floor acceleration: Acceleration of a particular building floor (or an equipment mounting) resulting from the ground motion of a given earth- quake. NOTE - In practice the floor acceleration may be resolved into its horizontal and verti
40、cal components. 3.10 geometric factor: Factor required in single axis testing to take into account the interaction along the different axes of the equipment of s imu I taneous mu It -di rectional in put vibrations . 3.11 .varies with altitude and geographical latitude. “g,“: Standard acceleration du
41、e to the earths gravity, which itself , NOTE - For the purposes of this standard, the value of g is rounded up to the nearest whole number, that is 10 m/s2. n 3.12 ground acceleration: Acceleration of the ground resulting from the motion of a given earthquake. NOTE - In practice the ground accelerat
42、ion may be resolved into its horizontal and vertical components. 3.13 lateral frequencies: Two frequencies determined according to the -3 dB response around the overall resonance frequency (see Figure 1). 3.14 maifunction: Loss of capability of the equipment to initiate or sustain a required functio
43、n, or the initiation of undesired spurious action which may result in adverse consequences for safety. NOTE - Malfunction will be defined by the relevant specification. 3.15 narrow-band response spectrum: Response spectrum in which single frequency excitation predominates (see Figure 2a). NOTES 1 Th
44、e bandwidth is normally 113 octave or less. 2 When several widely spaced well-defined frequencies exist, if justified, each of their responses may be treated separately as a narrow band response spectrum (see Figure 2b). 3.16 natural frequency: Frequency of free vibration of a structure depending on
45、ly on its own physical characteristics (mass, stiffness, and damping). 3.17 overall resonance: Resonance frequency at which a complete struc- ture amplifies the exciting motion. NOTE - Within the frequency range between 1 Hz and 35 Hz, overall resonance generally corresponds to the first mode of vib
46、ration. It is important to take into account the overall resonance frequencies when they are enclosed in the strong part of the required response spectrum see Sub-clause 3.27). 4 COPYRIGHT European Committee for Electrotechnical StandardizationLicensed by Information Handling Services340q583 0062O 6
47、59 m 68-3-3 O IEC 3.18 pause: Interval between consecutive test waves (for example sine beats). NOTE - A pause should be such that it results in no significant superposition of the response motions of an equipment. 3.19 preferred testing axes: Three orthogonal axes which correspond to the most vulne
48、rable axes of the equipment. 3.20 required response spectrum: Response spectrum specified by the user (see Figures 1, 2 and 3). 3.21 resonance frequency: Frequency at which, in forced oscillation, a change in the frequency of excitation causes a decrease in the response of the system. NOTES 1 The va
49、lue of resonance frequency depends upon the measured variable. For a given mode, the values of resonance frequency for displacement, velocity and acceleration are in increasing order of frequency. The differences between these resonance frequency values are small for the usual damping ratios. 2 In seismic testing, it is often assumed that a resonance frequency is significant when the transmissibility of the response is greater than 2. 3.22 response spectrum (not identical with IS0 2041 definition): Plot of the maximum response to a defined input motion of a
