1、 IEC 60068-2-57 Edition 3.0 2013-04 INTERNATIONAL STANDARD NORME INTERNATIONALE Environmental testing Part 2-57: Tests Test Ff: Vibration Time-history and sine-beat method Essais denvironnement Partie 2-57: Essais Essai Ff: Vibrations Mthode par acclrogrammes et sinusodes modules IEC 60068-2-57:2013
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16、RD NORME INTERNATIONALE Environmental testing Part 2-57: Tests Test Ff: Vibration Time-history and sine-beat method Essais denvironnement Partie 2-57: Essais Essai Ff: Vibrations Mthode par acclrogrammes et sinusodes modules INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTER
17、NATIONALE X ICS 19.040 PRICE CODE CODE PRIX ISBN 978-2-83220-745-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veui
18、llez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 60068-2-57 IEC:2013 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 8 2 Normative references . 8 3 Terms and definitions . 8 4 Test requirements and associated parameters 15 4.1 General . 15 4.2 Requirements for tes
19、ting . 15 4.3 Vibration response investigation 16 4.3.1 General . 16 4.3.2 Basic motion 16 4.3.3 Transverse motion . 16 4.3.4 Rotational motion 16 4.3.5 Measuring points . 16 4.3.6 Vibration amplitude tolerances . 17 4.3.7 Frequency tolerances 17 4.3.8 Sweeping 17 4.3.9 Damping ratio 17 4.4 Time-his
20、tory testing . 18 4.4.1 Basic motion 18 4.4.2 Transverse motion . 18 4.4.3 Rotational motion 18 4.4.4 Tolerance zone for the required response spectrum 18 4.4.5 Frequency range . 19 4.5 Sine-beat testing . 19 4.5.1 General description . 19 4.5.2 Vibration amplitude tolerances . 19 4.5.3 Test frequen
21、cy tolerances . 19 4.5.4 Transverse motion . 19 4.6 Mounting . 20 5 Severities . 20 5.1 General . 20 5.2 Time history 20 5.3 Test frequency range. 21 5.4 Required response spectrum . 21 5.5 Number and duration of time-histories . 21 5.5.1 Number of time histories 21 5.5.2 Time-history duration . 21
22、5.5.3 Duration of the strong part of the time history 22 5.5.4 Number of high stress cycles . 22 5.6 Sine-beat test level 23 5.6.1 General . 23 5.6.2 Test frequency determination 29 5.6.3 Sine-beat test wave . 29 5.6.4 Number of cycles in the sine beat 29 5.6.5 Modulating frequency 30 60068-2-57 IEC
23、:2013 3 5.6.6 Number of sine beats. 31 5.6.7 High-stress low-cycle fatigue effects 31 6 Preconditioning 31 7 Initial measurements 31 8 Testing . 31 8.1 General . 31 8.2 Vibration response investigation 31 8.3 Time-history testing . 32 8.4 Sine-beat testing . 32 8.5 Multi-axis testing . 32 8.5.1 Gene
24、ral . 32 8.5.2 Single axis testing . 32 8.5.3 Biaxial testing 32 8.5.4 Triaxial testing . 32 9 Intermediate measurements . 33 10 Recovery 33 11 Final measurements . 33 12 Information to be given in the relevant specification 33 13 Information to be given in the test report 34 Annex A (informative) G
25、uidance for time-history and sine-beat methods 35 Bibliography 41 Figure 1 Sequence of five sine beats with five cycles . 7 Figure 2 Number of cycles per sine beat 13 Figure 3 Typical time history 14 Figure 4 Typical logarithmic plot of a required response spectrum, test response spectrum and tolera
26、nce zone 14 Figure 5 Typical response of an oscillator excited by a specific time history during a test . 22 Figure 6 Recommended test level with crossover frequency at 0,8 Hz . 24 Figure 7 Recommended test level with crossover frequency at 1,6 Hz . 26 Figure 8 Recommended test level with crossover
27、frequency at 8 Hz 28 Figure 9 Amplification factors of different sine beats, continuous sine and a typical natural time-history . 30 Figure A.1 Recommended shape of a required response spectrum in generalized form 37 Figure A.2 Standardized presentation of matched sine beats of acceleration, velocit
28、y and displacement (five cycles within the sine beat of acceleration) . 40 Table 1 Comparison of tolerances 15 Table 2 Recommended test frequency ranges 21 Table 3 Recommended test levels with a crossover frequency of 0,8 Hz (see Figure 6) . 23 Table 4 Recommended test levels with a crossover freque
29、ncy of 1,6 Hz (see Figure 7) . 25 Table 5 Recommended test levels with a crossover frequency of 8 Hz (see Figure 8) 27 4 60068-2-57 IEC:2013 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ENVIRONMENTAL TESTING Part 2-57: Tests Test Ff: Vibration Time-history and sine-beat method FOREWORD 1) The Interna
30、tional Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electro
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39、ance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the e
40、lements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60068-2-57 has been prepared by IEC technical committee 104: Environmental conditions, classification and methods of test.
41、This third edition cancels and replaces the second edition, published in 1999. It also replaces IEC 60068-2-59:1990, which will be withdrawn. This edition includes only minor technical changes with respect to the previous edition: editorially combines IEC 60068-2-57 and IEC 60068-2-59; the title has
42、 been modified to include a sine beat method. The text of this standard is based on the following documents: FDIS Report on voting 104/595/FDIS 104/612/RVD 60068-2-57 IEC:2013 5 Full information on the voting for the approval of this standard can be found in the report on voting indicated in the abo
43、ve table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all the parts in the IEC 60068 series, published under the general title Environmental testing, can be found on the IEC website. This standard is to be used in conjunction with IEC 60068-1. The c
44、ommittee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised e
45、dition, or amended. 6 60068-2-57 IEC:2013 INTRODUCTION This part of IEC 60068 details methods for testing components, equipment and other electrotechnical products (hereinafter referred to as “specimens”) which in service can be subjected to random or oscillating type dynamic forces of short duratio
46、n, typical examples of which are the stresses induced in equipment as a result of earthquakes, explosions and certain phases of transportation, or by transient, short time vibration in machinery. The characteristics of these forces and the damping of the specimen may be such that the vibration respo
47、nse of the specimen will not reach a steady-state condition. The time-history test consists, after any preliminary vibration response investigation with sinusoidal or random vibration, in subjecting the specimen to a vibration (acceleration, velocity or displacement) the time history being specified
48、 by a response spectrum with characteristics simulating the effects of the dynamic forces. A time history may be developed or obtained from a natural event (natural time history), a random sample a synthesized signal artificial time history. In general, to adapt to the required testing severity, som
49、e modification is necessary. The use of a time history allows a single test wave to envelop a broadband response spectrum. It is possible for all the modes of the structure in the excitation axis (or axes) to be excited at the same time and consequently the stresses derived from the combined effects of the coupled modes are generally taken into account. In the sine beat test, the specimen
