GB/T 2423.56-2023 PDF in English
GB/T 2423.56-2023 (GB/T2423.56-2023, GBT 2423.56-2023, GBT2423.56-2023)
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Environmental testing - Part 2: Test methods - Test Fh: Vibration, broadband random and guidance
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| GB/T 2423.56-2018 | English | 440 |
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Environmental testing - Part 2: Test methods - Test Fh: Vibration, broadband random and guidance
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| GB/T 2423.56-2006 | English | 385 |
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Environmental testing for electric and electronic products - Part 2: Test methods - Test Fh: Vibration, broad-band random (digital control) and guidance
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Standards related to (historical): GB/T 2423.56-2023
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GB/T 2423.56-2023: PDF in English (GBT 2423.56-2023) GB/T 2423.56-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.040
CCS K 04
GB/T 2423.56-2023 / IEC 60068-2-64:2019
Replacing GB/T 2423.56-2018
Environmental testing - Part 2: Test methods - Test Fh:
Vibration, broadband random and guidance
(IEC 60068-2-64:2019, Environmental testing - Part 2-64: Tests - Test Fh: Vibration,
broadband random and guidance, IDT)
ISSUED ON: SEPTEMBER 07, 2023
IMPLEMENTED ON: APRIL 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 4
Introduction ... 6
1 Scope ... 7
2 Normative references ... 7
3 Terms and definitions ... 9
4 Requirements for test apparatus ... 17
4.1 General ... 17
4.2 Basic motion ... 18
4.3 Cross-axis motion ... 18
4.4 Mounting ... 19
4.5 Measuring systems ... 19
4.6 Vibration tolerances ... 20
4.7 Control strategy ... 23
4.8 Vibration response investigation ... 24
5 Severities ... 24
5.1 Test frequency range ... 25
5.2 RMS value of acceleration ... 25
5.3 Shape of acceleration spectral density curve ... 25
5.4 Test duration ... 26
6 Preconditioning ... 26
7 Initial measurements and functional performance test ... 26
8 Testing ... 26
8.1 General ... 26
8.2 Initial vibration response investigation ... 27
8.3 Low-level excitation for equalization prior to testing ... 28
8.4 Random testing ... 29
8.5 Final vibration response investigation ... 30
9 Recovery ... 30
10 Final measurements and functional performance ... 30
11 Information to be given in the relevant specification ... 30
12 Information to be given in the test report ... 32
Annex A (Informative) Standardized test spectra ... 34
A.1 Transportation ... 34
A.2 Stationary installation ... 35
A.3 Equipment in wheeled vehicles ... 36
A.4 Equipment installed in airplanes and helicopters ... 38
Annex B (Informative) Guidance ... 40
B.1 General introduction ... 40
B.2 Requirements for testing ... 41
B.3 Testing procedures ... 43
B.4 Equipment normally used with vibration isolators ... 43
B.5 Test severities ... 44
B.6 Equipment performance ... 44
B.7 Initial and final measurements ... 44
Annex C (Informative) Guidance on non-Gaussian distribution/high kurtosis tests .. 45
C.1 Non-Gaussian random vibration ... 45
C.2 Methods to generate non-Gaussian random vibration ... 45
C.3 Additional analysis ... 48
C.4 Frequency range ... 49
Annex NA (Informative) Constituent documents of GB/T 2423 ... 50
Bibliography ... 54
Foreword
This document is drafted in accordance with the rules provided in GB/T 1.1-2020
Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents.
This document is part 56 of GB/T 2423. See Annex NA for the published parts of GB/T
2423.
This document replaces GB/T 2423.56-2018 Environmental testing - Part 2: Test
methods - Test Fh: Vibration, broadband random and guidance. Compared with GB/T
2423.56-2018, except for structural adjustments and editorial changes, the main
technical changes are as follows:
a) Add the term “kurtosis” (see 3.39);
b) Add the term “skewness” (see 3.40);
c) Add the term “beta distribution” and “Figure 4” (see 3.41);
d) Add relevant provisions for “parameters determined during non-Gaussian vibration
testing” (see Clause 5);
e) Add “For non-Gaussian vibration testing, the time history shall be recorded and the
kurtosis, skewness (if applicable) and amplitude probability density shall be
established as required by the relevant specification” and “Figure 5” (see 8.4.1).
This document is identical to IEC 60068-2-64:2019 Environmental testing - Part 2-64:
Test - Test Fh: Vibration, broadband random and guidance.
This document makes the following minimal editorial changes:
a) In order to coordinate with the existing standards, change the standard name to
Environmental testing - Part 2: Test methods - Test Fh: Vibration, broadband
random and guidance;
b) Add Annex NA.
Please note that some of the contents of this document may involve patents. The issuing
organization of this document is not responsible for identifying patents.
This document was proposed and managed by the National Technical Committee on
Environmental Conditions of Electric and Electronic Products and Environmental Test
of Standardization Administration of China (SAC/TC 8).
Drafting organizations of this document: Guangzhou University, The Fifth Institute of
Electronics, Ministry of Industry and Information Technology, Beijing University of
Environmental testing – Part 2: Test methods – Test Fh:
Vibration, broadband random and guidance
1 Scope
This document 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 document 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 GB/T
2423.43-2008, 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 GB/T 2424.26-2008 for estimating the
dynamic vibration environment of the specimen and based on that, selecting the
appropriate test method.
Although primarily intended for electrotechnical specimens, this standard is not
restricted to them and may be used in other fields where desired (see Annex A).
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 2041, Vibration and shock – Vocabulary
specimen. It is therefore recommended that prior to mounting a specimen in its fixture
a dynamic response survey or modal test be performed on the fixture and necessary
modifications performed to avoid putting unrealistic loads into the specimen.
B.2 Requirements for testing
B.2.1 Single-point and multipoint control
The test requirements are confirmed by the acceleration spectral density computed from
the random signal measured at the reference point.
For stiff or small-size specimens, for example in component testing, or if it is known
that the dynamic influence of the specimen is low and the test fixture is stiff in the test
frequency range there need only be one checkpoint, which then becomes the reference
point.
In the case of large or complex specimens, for example equipment with well-spaced
fixing points, either one of the checkpoints, or some other point is specified for
reference. For a fictitious point, the acceleration spectral density is computed from the
random signals measured at the checkpoints. It is recommended that for large and/or
complex specimens a fictitious point is used.
B.2.1.1 Single-point control
Measurements are made at one reference point and the indicated acceleration spectral
density is directly compared with the specified acceleration spectral density.
B.2.1.2 Multipoint control
When multipoint control is specified or necessary, two frequency domain control
strategies are available.
B.2.1.2.1 Averaging strategy
In this method the acceleration spectral density is computed from the signal of each
checkpoint. A composite acceleration spectral density is found by arithmetically
averaging the acceleration spectral density of these checkpoints.
The arithmetically averaged acceleration spectral density is then compared to the
specified acceleration spectral density.
B.2.1.2.2 Extremal strategy
In this method, a composite acceleration spectral density is computed from the
maximum or the minimum extreme value of each frequency line of the acceleration
spectral density measured at each checkpoint. This method is also called ‘maximum’ or
‘minimum’ strategy, because it produces an acceleration spectral density which
represents the envelope of the acceleration spectral densities of each checkpoint.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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