1、 IEC 60068-2-65 Edition 2.0 2013-02 INTERNATIONAL STANDARD NORME INTERNATIONALE Environmental testing Part 2-65: Tests Test Fg: Vibration Acoustically induced method Essais denvironnement Partie 2-65: Essais Essai Fg: Vibrations Mthode induite acoustiquement IEC60068-2-65:2013 THIS PUBLICATION IS CO
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16、 Environmental testing Part 2-65: Tests Test Fg: Vibration Acoustically induced method Essais denvironnement Partie 2-65: Essais Essai Fg: Vibrations Mthode induite acoustiquement INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE V ICS 19.040; 29.020 PRICE CODE COD
17、E PRIX ISBN 978-2-83220-641-6 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! Veuillez vous assurer que vous avez obten
18、u cette publication via un distributeur agr. 2 60068-2-65 IEC:2013 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references 7 3 Terms, definitions, symbols and abbreviations. 7 3.1 Terms and definitions 7 3.2 Symbols and abbreviations 11 4 Acoustic environments and requirements for
19、testing 11 4.1 Acoustic environment for testing 11 4.1.1 General . 11 4.1.2 Reverberant field . 13 4.1.3 Progressive wave field . 14 4.1.4 Cavity resonance . 14 4.1.5 Standing wave . 14 4.2 Sound sources . 14 4.3 Measuring apparatus . 14 4.3.1 General . 14 4.3.2 Acoustic measurements . 14 4.3.3 Vibr
20、ation response measurements . 15 4.3.4 Analysis of results 15 4.4 Requirements for testing 15 4.4.1 Type of facility . 15 4.4.2 Mounting 15 4.4.3 Specimen instrumentation 16 4.4.4 Preparation of test control 17 5 Recommended severities 18 6 Preconditioning . 18 7 Initial measurements . 19 8 Testing
21、. 19 8.1 Normal testing . 19 8.2 Accelerated testing 19 9 Intermediate measurements 19 10 Recovery 19 11 Final measurements . 19 12 Information to be given in the relevant specification . 20 13 Information to be given in the test report . 20 Annex A (informative) Guidance for the test requirements.
22、22 Bibliography 30 Figure 1 Third-octave band spectrum for aeronautical applications . 12 Figure 2 Octave band spectra for fans derived from 4 . 13 Figure 3 Octave band spectrum for noisy industrial machinery derived from 4 . 13 Figure 4 Typical locations of microphone checkpoints (1 6) on a fictiti
23、ous surface around a specimen 17 60068-2-65 IEC:2013 3 Figure A.1 Typical microphone arrangement around a specimen in a reverberation chamber 22 Figure A.2 Typical microphone checkpoint arrangement around a long cylindrical specimen 25 Table 1 Tolerances for acoustic measurement 14 Table 2 Overall s
24、ound pressure level and duration of exposure . 18 Table A.1 Octave band/room volume relationship . 23 Table A.2 Reverberation room, ratios of dimensions . 23 Table A.3 Examples of sound sources with waveforms and typical power outputs 28 Table A.4 Typical OASPL and exposure durations 28 4 60068-2-65
25、 IEC:2013 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ENVIRONMENTAL TESTING Part 2-65: Tests Test Fg: Vibration Acoustically induced method FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committ
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36、ent rights. International Standard IEC 60068-2-65 has been prepared by IEC technical committee 104: Environmental conditions, classification and methods of test. This second edition cancels and replaces the second edition, published in 1993, and constitutes a technical revision. This edition include
37、s the following significant technical changes with respect to the previous edition: minor technical and editorial changes were made throughout the document as originally requested by the DE National Committee; following comments at the CD stage, particularly from the UK National Committee, significa
38、nt technical and editorial additions were made to the standard for acoustic testing employing the progressive wave tube technique. 60068-2-65 IEC:2013 5 The text of this standard is based on the following documents: FDIS Report on voting 104/591/FDIS 104/597/RVD Full information on the voting for th
39、e approval of this standard can be found in the report on voting indicated in the above 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 o
40、n the IEC website. The committee 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,
41、 replaced by a revised edition, or amended. 6 60068-2-65 IEC:2013 INTRODUCTION Acoustic noise may produce significant vibration in components and equipment. In the acoustic noise field, sound pressure fluctuations impinge directly on the specimen and the response may be different to that produced by
42、 mechanical excitation. Items particularly sensitive to acoustic noise include relatively lightweight items whose dimensions are comparable to an acoustic wavelength in the frequency range of interest and whose mass per unit area is low, such as dish antennas and solar panels, electronic devices, pr
43、inted circuit boards, optical elements, etc. Acoustic testing is applicable to components, equipment, functional units and other products, hereinafter referred to as “specimens”, which are liable to be exposed to and/or are required to function in conditions of high sound pressure levels. It should
44、be noted that, under service conditions, the specimen may be subjected to simultaneous mechanical and acoustical excitation. High sound pressure levels may be generated by jet engines and other aircraft propulsion systems, rocket motors, high-powered gas circulators, turbulent gas flow around aircra
45、ft or launchers, etc. This part of IEC 60068 deals with acoustic testing in compressible gases and can also be used to simulate the excitation response caused by turbulence resulting from high-velocity separated gas flows. The intent of the test procedure contained in this standard is to produce a h
46、igh intensity acoustic noise field by either reverberant methods (known as reverberant chamber testing) or by progressive wave methods (known as progressive wave tube testing). Testing for the effects of vibration caused by acoustic noise demands a certain degree of engineering judgement and this sh
47、ould be recognized both by the manufacturer/supplier and the purchaser of the specimen. Based on the guidance provided in this standard, the writer of the relevant specification is expected to select the most appropriate method of test and values of severity, taking account of the nature of the spec
48、imen and its intended use. Since the acoustic levels occurring during testing are high enough to be damaging to human hearing, appropriate protective measures need to be taken to reduce the noise exposure of operators performing the test to a level regarded as permissible from the standpoint of hear
49、ing conservation. 60068-2-65 IEC:2013 7 ENVIRONMENTAL TESTING Part 2-65: Tests Test Fg: Vibration Acoustically induced method 1 Scope This part of IEC 60068 provides standard procedures and guidance for conducting acoustic tests in order to determine the ability of a specimen to withstand vibration caused by a specified sound-pressure level environment to which it is, or is liable to be, sub
