SIST EN 60721-2-9:2014

SLOVENSKI STANDARD
SIST EN 60721-2-9:2014
01-julij-2014
Klasifikacija okoljskih pogojev - 2-9. del: Okoljski pogoji v naravi - Opredelitev
opisovanja okolja na podlagi izmerjenih podatkov o udarcih in tresljajih: med
hrambo, prevozom in uporabo
Classification of environmental conditions - Part 2-9: Environmental conditions appearing
in nature - Defining an environmental description from measured shock and vibration
data: Storage, transportation and in-use
Classification des conditions d’environnement - Partie 2-9: Conditions d’environnement
présentes dans la nature – Définition d’une description de l’environnement à partir des
données de chocs et de vibrations mesurées: Stockage, transport et utilisation
Ta slovenski standard je istoveten z: EN 60721-2-9:2014
ICS:
19.040 Preskušanje v zvezi z Environmental testing
okoljem
SIST EN 60721-2-9:2014 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60721-2-9:2014

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SIST EN 60721-2-9:2014


EUROPEAN STANDARD EN 60721-2-9

NORME EUROPÉENNE

EUROPÄISCHE NORM
May 2014
ICS 19.040

English Version
Classification of environmental conditions - Part 2-9:
Environmental conditions appearing in nature - Measured shock
and vibration data - Storage, transportation and in-use
(IEC 60721-2-9:2014)
Classification des conditions d'environnement - Partie 2-9: Klassifizierung von Umgebungsbedingungen - Teil 2-9:
Conditions d'environnement présentes dans la nature - Natürliche Einflüsse - Beschreibung von
Données de chocs et de vibrations mesurées - Stockage, Umgebungsbedingungen aus gemessenen Stoß- und
transport et utilisation Schwingungsdaten - Lagerung, Transport und Im-Betrieb
(CEI 60721-2-9:2014) (IEC 60721-2-9:2014)
This European Standard was approved by CENELEC on 2014-04-10. CENELEC members are bound to comply with the CEN/CENELEC
Internal 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 national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 60721-2-9:2014 E

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SIST EN 60721-2-9:2014
EN 60721-2-9:2014 - 2 -
Foreword
The text of document 104/630/FDIS, future edition 1 of IEC 60721-2-9, prepared by IEC TC 104
"Environmental conditions, classification and methods of test" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN 60721-2-9:2014.
The following dates are fixed:
(dop) 2015-01-10
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2017-04-10
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.
Endorsement notice
The text of the International Standard IEC 60721-2-9:2014 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60068-2 (Series) NOTE Harmonized as EN 60068-2 (Series).
IEC 60721-3 (Series) NOTE Harmonized as EN 60721-3 (Series).
IEC 60068-2-6:2007 NOTE Harmonized as EN 60068-2-6:2008.
IEC 60721-1 NOTE Harmonized as EN 60721-1.

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SIST EN 60721-2-9:2014




IEC 60721-2-9

®


Edition 1.0 2014-03




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










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 d’environnement –

Partie 2-9: Conditions d’environnement présentes dans la nature – Données de


chocs et de vibrations mesurées – Stockage, transport et utilisation













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

CODE PRIX R


ICS 19.040 ISBN 978-2-8322-1446-6



Warning! Make sure that you obtained this publication from an authorized distributor.

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 60721-2-9:2014
– 2 – IEC 60721-2-9:2014 © 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 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
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
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 tolerance 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

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SIST EN 60721-2-9:2014
IEC 60721-2-9:2014 © IEC 2014 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

CLASSIFICATION OF ENVIRONMENTAL 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 (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance 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 elements 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 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 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.

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SIST EN 60721-2-9:2014
– 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
environmental 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 publication 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 document using a
colour printer.

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SIST EN 60721-2-9:2014
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 weather or non-weather protected locations. This
measured data is normally in the form of acceleration versus time records. This, in turn, will
1
then allow appropriate severities to be chosen from the IEC 60068-2 series [1] of shock and
vibration test methods. Environmental levels given in IEC 60721-3 [2] should 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.
___________
1
 Numbers in square brackets refer to the Bibliography.

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SIST EN 60721-2-9:2014
– 6 – IEC 60721-2-9:2014 © IEC 2014
CLASSIFICATION 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 from measured data when related to a product's 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 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 document (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 normally distributed random waves of differing amplitudes mixed in a complex
manner.
Rarely can a real world environment be classified purely as a sinusoidal vibration and is
normally associated with a discrete excitation mechanism such as rotating machinery, aero
engines, propellers and is normally mixed with an associated random vibration process. It is
then necessary for the specification writer to decide whether to conduct a random vibration
test only or to perform one of the mixed mode tests.
Associated with the vibration environment for each life-cycle stage is, potentially, a shock
environment which may produce much higher acceleration levels in certain circumstances.
Generally speaking, the frequency content for these shocks is contained within the 0 Hz to
200 Hz bandwidth for, say, transportation, assuming that the packaged product is firmly
secured to the transport platform base and is not therefore ‘bouncing around’. However, much
higher frequencies, maybe in the kHz range, may be present in the in-use stage, again
dependent upon the real world scenario.
The process described below is for a random vibration environment, since it is probably the
most common form of test conducted. Any statement made therefore about the random
process should be interpreted as applying to the alternative process. However, it can equally
be applied to the shock environment by calculating the shock response spectrum and
conducting the same process on this spectrum as for an acceleration spectral density (ASD)

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SIST EN 60721-2-9:2014
IEC 60721-2-9:2014 © IEC 2014 – 7 –
spectrum. It is also equally applicable to sinusoidal data in the form of acceleration versus
frequency. However, special attention may be required for this data dependent upon the initial
process involved, that is, the acceleration involved, the r.m.s. value or the discrete value at
the frequency in question.
Other factors to be considered in this process include:
a) factoring for the random spectra, which may depend upon the eventual purpose of the test
programme, for example, robustness, qualification etc.;
b) statistical properties of the environment;
c) statistical properties of the product;
d) time – life cycle profile.
This clause looks at some of the general characteristics that can be expected from the
storage, transportation and use of a product.
3.2 Storage
During storage, the product is placed at a certain site for long periods, but not intended for
use during these periods. The storage location may be weather-protected, either totally or
partially, or non-weather-protected. In any case, in the storage environment the product will
undergo handling, thus it may be subjected to severe shock and vibration levels depending on
the type of handling devices and storage racks. As a consequence, the product may be
subjected to very benign, insignificant shock and vibration levels through to significant levels,
such as those transmitted from machines or passing vehicles, and maybe even higher levels
of shock and vibration such as that seen when stored close to heavy machines and conveyor
belts.
3.3 Transportation
3.3.1 Road
A shock and vibration environment is experienced any time a product is transported by road.
The main factors affecting the magnitude and frequency of such an environment are
– the design of the carrying vehicle,
– the velocity of the vehicle,
– the road profile,
– the position of the product in the vehicle,
– the reference axis for the vibration measurements with respect to the vehicle axi
...