IEC 60068-2-64:2008
(Main)Environmental testing - Part 2-64: Tests - Test Fh: Vibration, broadband random and guidance
Environmental testing - Part 2-64: Tests - Test Fh: Vibration, broadband random and guidance
IEC 60068-2-64:2008 demonstrates the adequacy of specimens to resist dynamic loads without unacceptable degradation of its functional and/or structural integrity when subjected to the specified random vibration test requirements. Broadband random vibration may be used to identify accumulated stress effects and the resulting mechanical weakness and degradation in the specified performance. This information, in conjunction with the relevant specification, may be used to assess the acceptability of specimens. This standard is applicable to specimens which may be subjected to vibration of a stochastic nature resulting from transportation or operational environments, for example in aircraft, space vehicles and land vehicles. It is primarily intended for unpackaged specimens, and for items in their transportation container when the latter may be considered as part of the specimen itself. However, if the item is packaged, then the item itself is referred to as a product and the item and its packaging together are referred to as a test specimen. This standard may be used in conjunction with IEC 60068-2-47:2005, for testing packaged products. If the specimens are subjected to vibration of a combination of random and deterministic nature resulting from transportation or real life environments, for example in aircraft, space vehicles and for items in their transportation container, testing with pure random may not be sufficient. See IEC 60068-3-8:2003 for estimating the dynamic vibration environment of the specimen and based on that, selecting the appropriate test method. The major changes with regard to the previous edition concern the removal of Method 1 and Method 2, replaced by a single method, and replacement of Annex A with suggested test spectra and removal of Annex C. Also included in this revision is the testing of soft packed specimens.
Essais d'environnement - Partie 2-64: Essais - Essai Fh: Vibrations aléatoires à large bande et guide
La CEI 60068-2-64:2008 a pour objet de démontrer la capacité des spécimens à résister aux charges dynamiques sans dégradation inacceptable de leur intégrité de fonctionnement et/ou de structure, lorsqu'ils sont soumis à des exigences d'essais de vibrations aléatoires spécifiées. L'essai de vibration aléatoire à large bande peut être utilisé pour identifier les effets de contraintes accumulées ainsi que la faiblesse et la dégradation mécaniques résultantes de la performance spécifiée. Ces informations, conjointement avec la spécification particulière, peuvent être utilisées pour évaluer l'acceptabilité des spécimens. Cette norme est applicable à des spécimens qui peuvent être soumis à des vibrations de nature stochastique dues au transport ou à l'environnement rencontré en service, par exemple, à bord d'avions et de véhicules spatiaux ou à bord de véhicules terrestres. Elle est destinée en premier lieu à des spécimens non emballés et à des objets dans leur emballage de transport lorsque celui-ci peut être considéré comme faisant partie du spécimen lui-même. Cependant, si l'article est emballé alors l'article lui-même est désigné comme produit et l'article ainsi que son emballage sont désignés comme spécimen d'essai. Cette norme peut être utilisée conjointement avec la CEI 60068-2-47:2005, pour l'essai des produits emballés. Si les spécimens sont soumis à des vibrations d'une combinaison de nature aléatoire et déterministe résultant du transport ou des environnements de la vie réelle, par exemple à bord d'avions, de véhicules spatiaux et pour des éléments dans leur emballage de transport, les essais purement aléatoires peuvent ne pas être suffisants. Voir la CEI 60068-3-8:2003 pour l'estimation de l'environnement de vibrations dynamiques du spécimen et sur cette base, pour la sélection de la méthode d'essai appropriée. Les modifications principales par rapport à l'édition précédente concernent le retrait de la Méthode 1 et de la Méthode 2, remplacées par une méthode unique, et remplacement de l'Annexe A par des spectres d'essais préconisés et le retrait de l'Annexe C. Aussi inclus dans cette révision, l'essai des spécimens avec emballages mous.
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IEC 60068-2-64
Edition 2.0 2008-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-64: Tests – Test Fh: Vibration, broadband random and guidance
Essais d’environnement –
Partie 2-64: Essais – Essai Fh: Vibrations aléatoires à large bande et guide
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IEC 60068-2-64
Edition 2.0 2008-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Environmental testing –
Part 2-64: Tests – Test Fh: Vibration, broadband random and guidance
Essais d’environnement –
Partie 2-64: Essais – Essai Fh: Vibrations aléatoires à large bande et guide
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
W
CODE PRIX
ICS 19.040 ISBN 2-8318-9745-9
– 2 – 60068-2-64 © IEC:2008
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms and definitions .8
4 Requirements for test apparatus.12
4.1 General .12
4.2 Basic motion .12
4.3 Cross-axis motion .13
4.4 Mounting .13
4.5 Measuring systems.13
4.6 Vibration tolerances .14
4.7 Control strategy.17
4.8 Vibration response investigation.17
5 Severities .18
5.1 Test frequency range .18
5.2 RMS value of acceleration .18
5.3 Shape of acceleration spectral density curve.18
5.4 Test duration .19
6 Preconditioning .19
7 Initial measurements and functional performance test .19
8 Testing .19
8.1 General .19
8.2 Initial vibration response investigation .20
8.3 Low-level excitation for equalization prior to testing.20
8.4 Random testing .21
8.5 Final vibration response investigation.21
9 Recovery.21
10 Final measurements and functional performance .21
11 Information to be given in the relevant specification .22
12 Information to be given in the test report .22
Annex A (informative) Standardized test spectra.24
Annex B (informative) Guidance.30
Bibliography.34
Figure 1 – Tolerance bands for acceleration spectral density; initial and final slope
(see B.2.3).14
Figure 2 – Time history of stochastically excitation; probability density function with
Gaussian (normal) distribution (Example with crest factor = 3, see also 3.14 and 4.6.2) .15
Figure 3 – Statistical accuracy of acceleration spectral density versus degrees of
freedom for different confidence levels (see also 4.6.3) .16
60068-2-64 © IEC:2008 – 3 –
Table A.1 – Categories for spectrum: transportation .24
Table A.2 – Break points for spectrum: transportation.25
Table A.3 – Categories for spectrum: stationary installation .25
Table A.4 – Break points for spectrum: stationary installation .26
Table A.5 – Categories for spectrum: equipment in wheeled vehicles .27
Table A.6 – Break points for spectrum: equipment in wheeled vehicles.28
Table A.7 – Categories for spectrum: equipment in airplanes and helicopters .29
Table A.8 – Break points for spectrum: equipment in airplanes and helicopters .29
– 4 – 60068-2-64 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ENVIRONMENTAL TESTING –
Part 2-64: Tests – Test Fh: Vibration,
broadband random and guidance
FOREWORD
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International Standard IEC 60068-2-64 has been prepared by IEC technical committee 104:
Environmental conditions, classification and methods of test.
This second edition cancels and replaces the first edition, published in 1993, and constitutes
a technical revision.
The major changes with regard to the previous edition concern the removal of Method 1 and
Method 2, replaced by a single method, and replacemen
...
IEC 60068-2-64 ®
Edition 2.1 2019-10
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Environmental testing –
Part 2-64: Tests – Test Fh: Vibration, broadband random and guidance
Essais d’environnement –
Partie 2-64: Essais – Essai Fh: Vibrations aléatoires à large bande et guide
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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About the IEC
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International Standards for all electrical, electronic and related technologies.
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IEC 60068-2-64 ®
Edition 2.1 2019-10
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Environmental testing –
Part 2-64: Tests – Test Fh: Vibration, broadband random and guidance
Essais d’environnement –
Partie 2-64: Essais – Essai Fh: Vibrations aléatoires à large bande et guide
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.040 ISBN 978-2-8322-7498-9
IEC 60068-2-64 ®
Edition 2.1 2019-10
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Environmental testing –
Part 2-64: Tests – Test Fh: Vibration, broadband random and guidance
Essais d’environnement –
Partie 2-64: Essais – Essai Fh: Vibrations aléatoires à large bande et guide
– 2 – IEC 60068-2-64:2008+AMD1:2019 CSV
IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Requirements for test apparatus . 13
4.1 General . 13
4.2 Basic motion . 14
4.3 Cross-axis motion . 14
4.4 Mounting . 14
4.5 Measuring systems. 14
4.6 Vibration tolerances . 15
4.6.1 ASD and r.m.s. value . 15
4.6.2 Distribution . 15
4.6.3 Statistical accuracy. 16
4.6.4 Frequency resolution . 17
4.7 Control strategy . 18
4.7.1 Single/multipoint control . 18
4.7.2 Multireference control . 18
4.8 Vibration response investigation . 18
5 Severities . 19
5.1 Test frequency range . 19
5.2 RMS value of acceleration . 19
5.3 Shape of acceleration spectral density curve . 20
5.4 Test duration . 20
6 Preconditioning . 20
7 Initial measurements and functional performance test . 20
8 Testing . 20
8.1 General . 20
8.2 Initial vibration response investigation . 21
8.3 Low-level excitation for equalization prior to testing . 22
8.4 Random testing . 22
8.4.1 General . 22
8.4.2 Intermediate measurements and functional performance . 23
8.5 Final vibration response investigation . 23
9 Recovery . 24
10 Final measurements and functional performance . 24
11 Information to be given in the relevant specification . 24
12 Information to be given in the test report . 25
Annex A (informative) Standardized test spectra . 26
Annex B (informative) Guidance. 32
B.1 General introduction . 32
B.2 Requirements for testing . 32
B.2.1 Single-point and multipoint control . 32
IEC 2019
B.2.2 Distribution . 33
B.2.3 Initial and final slope. 34
B.3 Testing procedures . 34
B.4 Equipment normally used with vibration isolators . 35
B.4.1 Transmissibility factors for isolators . 35
B.4.2 Temperature effect . 35
B.5 Test severities . 35
B.6 Equipment performance . 35
B.7 Initial and final measurements . 35
Annex C (informative) Guidance on non-Gaussian distribution/high kurtosis tests . 36
C.1 Non-Gaussian random vibration . 36
C.2 Methods to generate non-Gaussian random vibration . 36
C.2.1 General . 36
C.2.2 Amplitude modulation technique . 37
C.2.3 Phase modification technique . 37
C.2.4 Non-uniform phase technique . 38
C.3 Additional analysis . 38
C.4 Frequency range . 39
Bibliography . 40
Figure 1 – Tolerance bands for acceleration spectral density; initial and final slope
(see B.2.3) . 15
Figure 2 – Time history of stochastically excitation; probability density function with
Gaussian (normal) distribution (example with crest factor = 3, see also 3.14 and 4.6.2) . 16
Figure 3 – Statistical accuracy of acceleration spectral density versus degrees of
freedom for different c
...
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