GB/T 2423.48-2018 PDF English
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Environmental testing - Part 2: Test methods - Test Ff: Vibration - Time-history and sine-beat method
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Environmental testing for electric and electronic products - Part 2: Test methods - Test Ff: Vibration - Time-history method
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GB/T 2423.48-2018: Environmental testing - Part 2: Test methods - Test Ff: Vibration - Time-history and sine-beat method
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT2423.48-2018
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 19.040
K 04
GB/T 2423.48-2018 / IEC 60068-2-57.2013
Replacing GB/T 2423.48-2008, GB/T 2423.49-1997
Environmental testing - Part 2.Test methods - Test Ff.
Vibration - Time-history and sine-beat method
(IEC 60068-2-57.2013, Environmental testing - Part 2-57.Tests - Test Ff.
Vibration - Time-history and sine-beat method, IDT)
Issued on. DECEMBER 28, 2018
Implemented on. JULY 01, 2019
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 4
Introduction... 6
Figure 1 -- Sequence of five sine beats with five cycles... 7
1 Scope... 8
2 Normative references... 8
3 Terms and definitions... 8
Figure 2 -- Number of cycles per sine beat... 15
Figure 3 -- Typical time history... 15
Figure 4 -- Typical logarithmic plot of a required response spectrum, test response
spectrum and tolerance zone... 16
4 Test requirements and associated parameters... 16
4.1 General... 16
4.2 Requirements for testing... 16
Table 1 -- Comparison of tolerances... 17
4.3 Vibration response investigation... 17
4.4 Time-history testing... 20
4.5 Sine-beat testing... 21
4.6 Mounting... 22
5 Severities... 23
5.1 General... 23
5.2 Time history... 24
5.3 Test frequency range... 24
Table 2 -- Recommended test frequency ranges... 24
5.4 Required response spectrum... 24
5.5 Number and duration of time-histories... 25
Figure 5 -- Typical response of an oscillator excited by a specific time history during a test
(70% of specified limit)... 26
5.6 Sine-beat test level... 26
Table 3 -- Recommended test levels with a crossover frequency of 0.8 Hz (see Figure 6)
... 27
Figure 6 -- Recommended test level with crossover frequency at 0.8 Hz... 28
Table 4 -- Recommended test levels with a crossover frequency of 1.6 Hz (see Figure 7)
... 28
Table 5 -- Recommended test levels with a crossover frequency of 8 Hz (see Figure 8). 28
Figure 7 -- Recommended test level with crossover frequency at 1.6 Hz... 30
Figure 8 -- Recommended test level with crossover frequency at 8 Hz... 30
Figure 9 -- Amplification factors of different sine beats, continuous sine and a typical
natural time-history... 32
6 Preconditioning... 32
7 Initial measurements... 32
8 Testing... 33
8.1 General... 33
8.2 Vibration response investigation... 33
8.3 Time-history testing... 34
8.4 Sine-beat testing... 34
8.5 Multi-axis testing... 34
9 Intermediate measurements... 35
10 Recovery... 35
11 Final measurements... 35
12 Information to be given in the relevant specification... 35
13 Information to be given in the test report... 36
Annex A (informative) Guidance for time-history and sine-beat methods... 38
Figure A.1 -- Recommended shape of a required response spectrum in generalized form
... 41
Figure A.2 -- Standardized presentation of matched sine beats of acceleration, velocity and
displacement (five cycles within the sine beat of acceleration)... 45
Bibliography... 46
Foreword
GB/T 2423 “Environmental testing - Part 2” is divided into several parts according to
test methods.
This Part is Part 48 of GB/T 2423.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces GB/T 2423.48-2008 “Environmental testing for electric and
electronic products - Part 2.Test methods - Test Ff. Vibration- Time-history method”
and GB/T 2423.49-1997 “Environmental testing for electric and electronic products
Part 2.Test methods Test Fe. Vibration-sine-beat method”. Compared with GB/T
2423.48-2008 and GB/T 2423.49-1997, in addition to editorial modifications, the main
technical changes are as follows.
- combined the contents of GB/T 2423.48-2008 and GB/T 2423.49-1997; rearranged
the structure of this Part;
- deleted GB/T 2423.5-1995, ISO 266.1997 and ISO 2041.1990, GB/T 2298-1991
as references;
- noted the sources of the terms and definitions; modified some definitions and
explained the modification;
- modified the definition for “damping”; added the terms “viscous damping”, “high
stress cycles”, “natural time history”; added the note of the term “signal
tolerance”; deleted the terms "response peak", "random motion sample",
"sampling frequency", "distortion", and "strong part of the specified response
spectrum";
- modified the content of “general requirements”;
- modified the content of “test frequency range”;
- added the requirements for test tolerance;
- deleted “parasitic movement”; separated the concepts of "lateral motion" and
"rotational motion";
- modified “signal tolerance” and “vibration amplitude tolerance”;
- deleted "calculation of test response spectrum";
- modified "number of response high peaks", "vibration response check" and "time
history test";
- deleted Annex B “Test frequency range” of GB/T 2423.48-2008;
- modified Annex A “Guidelines” of GB/T 2423.49-1997;
- added Clause 13 "Information to be given in the test report".
This Part uses translation method to identically adopt IEC 60068-2-57.2013
“Environmental testing - Part 2-57.Tests - Test Ff. Vibration - Time-history and sine-
beat method”.
The Chinese documents which have consistency with the international normative
references in this Part are as follows.
- GB/T 2421.1-2008, Environmental Testing for Electric and Electronic products -
General and Guidance (IEC 60068-1.1998, IDT);
- GB/T 2423.10-2008, Environmental testing for electric and electronic products -
Part 2.Tests methods - Test Fc. Vibration (sinusoidal) (IEC 60068-2-6.1995, IDT);
- GB/T 2424.26-2008, Environmental testing - Supporting documentation and
guidance - Selecting amongst vibration tests (IEC 60068-3-8.2003, IDT);
- GB/T 2423.56-2018, Environmental testing - Part 2.Test methods - Test Fh.
Vibration, broadband random and guidance (IEC 60068-2-64.2008, IDT).
For ease of use, this Part made the following editorial changes.
- the name of this Part is modified to “Environmental testing - Part 2.Test methods
- Test Ff. Vibration - Time-history and sine-beat method”.
This Part was proposed by and shall be under the jurisdiction of National Technical
Committee on Environmental Conditions and Environmental Tests of Electrical and
Electronic Products of Standardization Administration of China (SAC/TC 8).
The drafting organizations of this Part. The Fifth Electronic Research Institute of the
Ministry of Industry and Information Technology, Chongqing Saibao Industrial
Technology Research Institute, Wuhu Saibao Information Industry Technology
Research Institute Co., Ltd.
Main drafters of this Part. Xie Zhangyong, Zhouyang Hongsheng, Yangchuan, Hou
Weiguo.
Versions of standard substituted by this Standard are.
- GB/T 2423.48-1997, GB/T 2423.48-2008;
- GB/T 2423.49-1997.
1 Scope
This Part of GB/T 2423 provides a standard procedure for determining, by the time-
history and sine-beat methods, the ability of a specimen to withstand specified severities
of transient vibration.
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.
GB/T 2424.25-2000, Environmental testing for electric and electronic products Part
3.Test guidance Seismic test methods (IEC 60068-3-3.1991, IDT)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE. Some of the following terms can be found in ISO 2041 [4], IEC 60068-1 or in IEC 60068-
2-6.Where, for the convenience of the reader, a definition from one of those sources is included
here, it is indicated.
4 Test requirements and associated parameters
The requirements for a vibration response investigation are given in 4.3, those for time-
history testing in 4.4, those for sine-beat testing in 4.5 while 4.6 deals with mounting
for testing.
5 Severities
The test frequencies and the test frequency range are obtained as shown in 5.3.
The test frequency range shall be given in the relevant specification by selecting a lower
frequency from 0.1 Hz, 1 Hz, 5 Hz, 10 Hz, 55 Hz, 100 Hz and an upper frequency from
10 Hz, 20 Hz, 35 Hz, 55 Hz, 100 Hz, 150 Hz, 300 Hz, 500 Hz, 2 000 Hz. The
recommended ranges are shown in Table 2.
6 Preconditioning
The relevant specification may call for preconditioning as, for example, conditioning
the specimen with defined temperature and/or humidity.
7 Initial measurements
The specimen shall be submitted to the visual, dimensional and functional checks
prescribed by the relevant specification.
8 Testing
For sine-beat testing, values for the severity are given by the relevant specification
according to Clause 5.Between consecutive sine beats a pause shall be included such
that no significant superposition of response motion of the specimen occurs.
9 Intermediate measurements
When prescribed by the relevant specification, the specimen shall function during a
prescribed number of time-history or sine-beat tests and its performance shall be
checked.
10 Recovery
It is sometimes necessary, when prescribed by the relevant specification, to provide a
period of time after testing and before final measurements to allow the specimen to
attain the same conditions, for example of temperature, as existed for the initial
measurements.
11 Final measurements
The specimen shall be submitted to the visual, dimensional and functional checks
prescribed by the relevant specification.
12 Information to be given in the relevant specification
When either of these tests is included in a relevant specification, the following details
shall be given, in so far as they are applicable, paying particular attention to the items
marked with an asterisk (*) as this information is always required.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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