1、 IEC 60721-2-9 Edition 1.0 2014-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Classification of environmental conditions Part 2-9: Environmental conditions appearing in nature Measured shock and vibration data Storage, transportation and in-use Classification des conditions denvironnement Partie 2-
2、9: Conditions denvironnement prsentes dans la nature Donnes de chocs et de vibrations mesures Stockage, transport et utilisation IEC 60721-2-9:2014-03(en-fr) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2014 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified,
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20、721-2-9 Edition 1.0 2014-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Classification of environmental conditions Part 2-9: Environmental conditions appearing in nature Measured shock and vibration data Storage, transportation and in-use Classification des conditions denvironnement Partie 2-9: Cond
21、itions denvironnement prsentes dans la nature Donnes de chocs et de vibrations mesures Stockage, transport et utilisation INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE R ICS 19.040 PRICE CODE CODE PRIX ISBN 978-2-8322-1446-6 Registered trademark of the Internat
22、ional 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 obtenu cette publication via un distributeur agr. colour inside 2 IEC 6
23、0721-2-9:2014 IEC 2014 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope and object . 6 2 Normative references 6 3 General . 6 3.1 Introductory remarks 6 3.2 Storage 7 3.3 Transportation . 7 3.3.1 Road 7 3.3.2 Rail . 7 3.3.3 Air 8 3.3.4 Sea . 8 3.4 In-use 8 4 Shock and vibration data . 9 5 Description
24、of the methods 9 5.1 General 9 5.2 ASD envelope method . 9 5.3 Normal tolerance limit method 10 5.4 Product axis . 11 5.4.1 Known axis . 11 5.4.2 Unknown axis . 12 5.5 Factoring for variables and unknowns 12 Annex A (informative) Worked example . 13 A.1 Envelope curve 13 A.2 NTL curve calculation 13
25、 A.3 Processing of the envelope curve and NTL curve . 13 Annex B (informative) Method to smooth and envelop an environmental description spectrum . 15 B.1 Original data 15 B.2 Octave averaging . 15 B.3 Averaging method 15 B.4 Standard slope curves . 16 B.5 Comparison of envelope and NTL curves . 17
26、Bibliography 19 Figure A.1 Comparison of curves 1 to 5 and the envelope curve 7 and 95/50 NTL curve 6 . 14 Figure B.1 95/50 NTL envelope of data 15 Figure B.2 95/50 NTL envelope of data 16 Figure B.3 1/3 octave averaged with standard slopes 17 Figure B.4 Comparison of curves with increasing normal t
27、olerance factors C . 18 Table 1 Normal tolerance factors, C . 11 Table A.1 Example of five hypothetical curves for random vibration . 13 Table A.2 Calculation for the five hypothetical curves 14 IEC 60721-2-9:2014 IEC 2014 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ CLASSIFICATION OF ENVIRONMENTAL
28、 CONDITIONS Part 2-9: Environmental conditions appearing in nature Measured shock and vibration data Storage, transportation and in-use FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees
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39、 rights. International Standard IEC 60721-2-9 has been prepared by IEC technical committee 104: Classification of environmental conditions. The text of this standard is based on the following documents: FDIS Report on voting 104/630/FDIS 104/632/RVD Full information on the voting for the approval of
40、 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. 4 IEC 60721-2-9:2014 IEC 2014 A list of all parts in the IEC 60721 series, published under the general title Classification of enviro
41、nmental conditions, can be found on 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 publicati
42、on will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this d
43、ocument using a colour printer. IEC 60721-2-9:2014 IEC 2014 5 INTRODUCTION This part of IEC 60721 is intended as part of the strategy for defining an environmental description from measured data acquired at multiple locations whilst a product is either in storage, being transported or in-use at weat
44、her or non-weather protected locations. This measured data is normally in the form of acceleration versus time records. This, in turn, will then allow appropriate severities to be chosen from the IEC 60068-2 series 11of shock and vibration test methods. Environmental levels given in IEC 60721-3 2 sh
45、ould then be applied, having been updated based upon the strategy described in this standard. More detailed information may be obtained from specialist documentation, some of which is given in the bibliography. _ 1Numbers in square brackets refer to the Bibliography. 6 IEC 60721-2-9:2014 IEC 2014 CL
46、ASSIFICATION OF ENVIRONMENTAL CONDITIONS Part 2-9: Environmental conditions appearing in nature Measured shock and vibration data Storage, transportation and in-use 1 Scope and object This part of IEC 60721 is intended to be used to define the strategy for arriving at an environmental description fr
47、om measured data when related to a products life cycle. Its object is to define fundamental properties and quantities for characterization of storage, transportation and in-use shock and vibration data as background material for the severities to which products are liable to be exposed during those
48、phases of their lifecycle. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced do
49、cument (including any amendments) applies. None. 3 General 3.1 Introductory remarks Shock and vibrations measured in storage, transportation platforms and in-use locations can vary considerably from a basic sinusoidal character to pure random, which itself may or may not be normally distributed. If it is the latter, it can be reasonably assumed that the process is a sum of nor
