HOME   Cart(0)   Quotation   About-Us Tax PDFs Standard-List Powered by Google www.ChineseStandard.net Database: 189759 (9 Feb 2025)

GB/T 2423.56-2023 English PDF (GB/T 2423.56-2018, GB/T 2423.56-2006)

GB/T 2423.56-2023_English: PDF (GB/T2423.56-2023)
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 2423.56-2023English560 Add to Cart 0--9 seconds. Auto-delivery Environmental testing - Part 2: Test methods - Test Fh: Vibration, broadband random and guidance Valid GB/T 2423.56-2023
GB/T 2423.56-2018English440 Add to Cart 0--9 seconds. Auto-delivery Environmental testing - Part 2: Test methods - Test Fh: Vibration, broadband random and guidance Obsolete GB/T 2423.56-2018
GB/T 2423.56-2006English385 Add to Cart 0--9 seconds. Auto-delivery Environmental testing for electric and electronic products - Part 2: Test methods - Test Fh: Vibration, broad-band random (digital control) and guidance Obsolete GB/T 2423.56-2006


BASIC DATA
Standard ID GB/T 2423.56-2023 (GB/T2423.56-2023)
Description (Translated English) Environmental testing - Part 2: Test methods - Test Fh: Vibration, broadband random and guidance
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K04
Classification of International Standard 19.040
Word Count Estimation 36,318
Date of Issue 2023-09-07
Date of Implementation 2024-04-01
Older Standard (superseded by this standard) GB/T 2423.56-2018
Drafting Organization Guangzhou University, the Fifth Institute of Electronics of the Ministry of Industry and Information Technology, Beijing University of Aeronautics and Astronautics, Shanghai Institute of Quality Supervision and Inspection Technology, Suzhou Suzhou Testing Group Co., Ltd., Beijing Zhongyuan Environmental Testing Mechanical and Electrical Equipment Technology Co., Ltd., China Aviation Comprehensive Technology Research Institute, Guangdong Laibotong Testing Equipment Co., Ltd., Guangzhou Saibao Tengrui Information Technology Co., Ltd., Suzhou Xinke Testing Technology Co., Ltd.
Administrative Organization National Standardization Technical Committee on Environmental Conditions and Environmental Testing of Electrical and Electronic Products (SAC/TC 8)
Proposing organization National Standardization Technical Committee on Environmental Conditions and Environmental Testing of Electrical and Electronic Products (SAC/TC 8)
Issuing agency(ies) State Administration for Market Regulation, National Standardization Administration

BASIC DATA
Standard ID GB/T 2423.56-2018 (GB/T2423.56-2018)
Description (Translated English) Environmental testing -- Part 2: Test methods -- Test Fh: Vibration, broadband random and guidance
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K04
Classification of International Standard 19.020
Word Count Estimation 29,216
Date of Issue 2018-12-28
Date of Implementation 2019-07-01
Older Standard (superseded by this standard) GB/T 2423.56-2006
Quoted Standard GB/T 2423.43-2008; GB/T 2424.26-2008; IEC 60050-300; IEC 60068-1; IEC 60068-2-6; IEC 60068-5-2; IEC 60721-3-0; IEC 60721-3-1; IEC 60721-3-2; IEC 60721-3-3; IEC 60721-3-4; IEC 60721-3-5; IEC 60721-3-6; IEC 60721-3-7; IEC 60721-3-9; IEC GUIDE 104; ISO 2041
Adopted Standard IEC 60068-2-64-2008, IDT
Drafting Organization GuangZhou University
Administrative Organization National Technical Committee for Environmental Conditions and Environmental Testing Standardization of Electrical and Electronic Products
Regulation (derived from) National Standard Announcement No. 17 of 2018
Proposing organization National Technical Committee for Environmental Conditions and Environmental Testing Standardization of Electrical and Electronic Products (SAC/TC 8)
Issuing agency(ies) State Administration of Markets and China National Standardization Administration
Summary This standard specifies the test method for random vibration standards to determine the ability of a sample to withstand dynamic loads without the occurrence of unacceptable functional degradation and/or compliance with the overall structure under the specified random vibration test. Wideband random vibrations can be used to identify stress accumulation effects and degradation of specific functions. This information, combined with relevant specifications, can be used to assess whether a sample is acceptable. This standard applies to samples that may be subject to random vibrations in a transport or work environment, such as in aircraft, spaceships, and land vehicles. It is primarily used for unpackaged samples and as part of the sample itself during transport. sample. However, for a packaged sample, the sample, along with its packaging, is considered a sample. For packed samples

BASIC DATA
Standard ID GB/T 2423.56-2006 (GB/T2423.56-2006)
Description (Translated English) Environmental testing for electric and electronic products. Part 2: Test methods. Test Fh: Vibration, broad-band random (digital control) and guidance
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard K04
Classification of International Standard 19.020
Word Count Estimation 30,379
Date of Issue 2006-11-08
Date of Implementation 2007-04-01
Quoted Standard GB/T 2298-1991; GB/T 2421-1999; GB/T 2423.10-1995; GB/T 2423.43-1995; GB/T 4796; IEC 60050-301-1983; IEC 60050-302-1983; IEC 60050-303-1983; IEC 60068; IEC 60068-2
Adopted Standard IEC 60068-2-64-1993, IDT
Drafting Organization Guangzhou University
Administrative Organization National Electrical and Electronic Products Environmental Standardization Technical Committee
Regulation (derived from) China Announcement of Newly Approved National Standards No. 11 of 2006 (No. 98 overall)
Proposing organization China Electrotechnical Society
Issuing agency(ies) Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China
Summary This standard provides two standard test method (Method 1 and Method 2) to determine the test sample subjected to a specified band random vibration. Can not be considered an experimental approach than other more severe test method, the main difference is the Test Method 2 provides additional information to quantify the test applied, it has a better reproducibility. This standard also reveals random vibration caused by the cumulative effects of stress and specific mechanical performance, and the use of such information and related specifications to assess the acceptability of the test sample. Sometimes, this standard is also used to demonstrate the adaptability of mechanical environmental samples and/or study their dynamics. This standard applies to the transport or work environment may be subject to random vibration of the sample, as in aircraft, spacecraft and land transport modes, it is mainly used without packaging samples, as well as its packaging during transport as part of test sample itself sample. This standard applies to electrical and electronic products, but is not limited to this, also applicable to other areas of the product.


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. ......


GB/T 2423.56-2018 Environmental testing--Part 2. Test methods--Test Fh. Vibration, broadband random and guidance ICS 19.020 K04 National Standards of People's Republic of China Replaces GB/T 2423.56-2006 2018-12-28 release 2019-07-01 Implementation State Administration of Market Supervision Published by China National Standardization Administration Contents Foreword I Introduction III 1 range 1 2 Normative references 1 3 Terms and definitions 2 4 Test requirements 6 4.1 General requirements 6 4.2 Basic movements 6 4.3 Lateral motion 6 4.4 Installation 6 4.5 Measurement system 6 4.6 Vibration tolerance 7 4.7 Control 9 4.8 Vibration response check 10 5 Severity Level 10 5.1 Test frequency range 10 5.2 Root mean square value of acceleration 10 5.3 Spectral Patterns of Acceleration Spectral Density 10 5.4 Test duration 11 6 Pretreatment 11 7 Initial test and function test 11 8 Test 11 8.1 General requirements 11 8.2 Initial vibration response check 11 8.3 Low magnitude incentive equilibrium before the test 12 8.4 Randomized trials 12 8.5 Final Vibration Response Check 12 9 Recovery 13 10 Final test and function test 13 11 Information to be given in the relevant specifications 13 12 Information to be given in the test report 14 Appendix A (informative) Standard test spectrum 15 Appendix B (informative) Guideline 21 References 24 Foreword GB/T 2423 "Environmental Test Part 2" is divided into several parts according to the test method. This part is the 56th part of GB/T 2423. This section is drafted in accordance with the rules given in GB/T 1.1-2009. This section replaces GB/T 2423.56-2006 "Environmental Tests for Electrical and Electronic Products-Part 2. Test Methods Test Fh. Broadband Random Vibration (Digital Control) and Guidelines. Compared with GB/T 2423.56-2006, in addition to editorial changes, the main technical changes are as follows. --- Removed the bandwidth symbol "Br" (see 3.1 of the.2006 version); --- Added "lateral motion", "actual motion", "fixed point", "control method", "single point control", "measurement point", "sampling frequency", and "multipoint control" Terms and definitions for "control strategy", "peak factor", and "test frequency range" (see 3.1, 3.2, 3.3, 3.4, 3.4.1, 3.6, 3.12, 3.13, 3.16, 3.37); --- Modified "multi-point average control" to "multi-point control" and the definition of terms (see 3.4.2, 3.20 of the.2006 version); --- Added the acceleration spectrum density symbol "ASD" (see 3.18); --- The definition of the term "controlling the acceleration spectral density" has added "or virtual reference points" (see 3.19, 3.5 of the.2006 version); --- Modified the terminology of "Clip of the drive signal", "Effective frequency range", "Indication of acceleration spectral density", "Root mean square value" and "Standard deviation" Meaning (see 3.21, 3.22, 3.27, 3.33, 3.34, 3.10, 3.11, 3.17, 3.28, 3.29 of the.2006 edition); --- Increased the frequency resolution symbol "Be" (see 3.26); --- Added the statistical DOF symbol "DOF" (see 3.36, 3.31 of the.2006 version); --- Modify the term "random wave" in the definition of "true acceleration spectral density" to "random signal" (see 3.38,.2006 version 3.33); --- Deleted the definitions of the terms "deviation", "damping ratio", "distortion", "frequency sweep cycle" and "window function" (see 3.3, 3.8, 3.9, 3.32, 3.34); --- Amended the relevant content of "General requirements" (see 4.1, 4.1 of the.2006 version); --- Amended the relevant content in the "Basic Movement" and added notes (see 4.2, 4.3.1 of the.2006 version); --- Increased the "measurement system" (see 4.5); --- Increased "control" (see 4.7); --- Related relevant content in "Vibration Response Check" (see 4.8, 4.2 of.2006 edition); --- Added the rule "Test samples should be installed in accordance with the requirements of IEC 60068-2-47. In all cases, in IEC 60068-2-47 To select a curve, first square it and then multiply it by the acceleration spectral density (ASD) or directly by the sine amplitude. "(See 4.4,.2006 edition 4.4); --- Added the stipulation that "the probability density function for calculating the reference point at the beginning, middle and end of the test should last 2 minutes each. Related regulations Fan should specify the tolerance of the normal distribution "and" Figure 2 "(see 4.6.2, 4.3.3 of the.2006 edition); --- Added the title "ASD and rms values" (see 4.6.1, 4.3.4 of the.2006 version); --- Added the rule "If the relevant regulations provide that the confidence level is to be met in the test, Figure 3 should be used to calculate the accuracy of the statistical results Sex "(see 4.6.3, 4.3.5 of the.2006 edition); --- Modified the method and formula for selecting the frequency resolution Be and related content (see 4.6.4, 4.3.6 of the.2006 version); --- Modified "Acceleration Spectrum Density" to "Acceleration Root Mean Square" (see 5.2, 5.3 of the.2006 edition); --- Modified the "initial test" to "initial test and function test" (see Chapter 7, Chapter 7 of the.2006 edition); --- Modified "Vibration response" to "Initial vibration response" and related content (see 8.2,.2006 version 8.2); --- Modified the "random vibration test" to "random test" and related content (see 8.4,.2006 version 8.4); --- Modified the "test duration" (see 5.4, 5.5 of the.2006 version); --- Modified the "intermediate detection" to "intermediate detection and function detection" and related content (see 8.4.2, 8.5 of the.2006 version); --- Modified the "final test" to "final test and function test" and related content (see Chapter 10, Chapter 10 of the.2006 edition chapter); --- Added "Information to be given in the test report" (see Chapter 12); --- Removed the normative appendix "Vibration Response Check" (see Appendix A of the.2006 edition); --- Informative appendix "Standard Test Spectrum" (see Appendix A). This section uses the translation method equivalent to IEC 60068-2-64..2008 "Environmental Tests Part 2-64. Test Test Fh. Broadband Random Vibrations and Guidelines. The Chinese documents that have a consistent correspondence with the international documents referenced normatively in this section are as follows. --- GB/T 2298-2010 Vocabulary for mechanical vibration, shock and condition monitoring (ISO 2041..2009, IDT); --- GB/T 2421.1-2008 Overview and guidelines for environmental testing of electric and electronic products (IEC 60068-1. 1988, IDT); --- GB/T 2422-2012 Environmental Test Test Method Compilation Guide Terms and Definitions (IEC 60068-5-2..1990, IDT); --- GB/T 2423.10-2008 Environmental testing for electric and electronic products Part 2. Test methods Test Fc. Vibration (sine) (IEC 60068-2-6..1995, IDT); --- GB/T 16499-2017 Number of electrical and electronic safety publications and basic safety publications and multi-professional shared safety publications Application guidelines (IEC Guide104..2010, NEQ). The following editorial changes have been made in this section. --- Modified the standard name. This section is proposed and managed by the National Technical Committee for Environmental Conditions and Environmental Testing of Electrical and Electronic Products (SAC/TC8). This section was drafted. Guangzhou University, the Fifth Institute of Electronics of the Ministry of Industry and Information Technology, Beijing University of Aeronautics and Astronautics, Shanghai Quality Supervision Inspection Technology Research Institute, Suzhou Sutest Test Instrument Co., Ltd., Beijing Zhongyuan Environmental Test Electromechanical Equipment Technology Co., Ltd., China Aviation Comprehensive Institute of Technology. The main drafters of this section. Xu Zhonggen, Ji Chunyang, Li Chuanri, Lu Zhaoming, Xu Liyi, Zhang Yue, Xu Ming, and Liu Qihua. The previous versions of the standards replaced by this section are. --- GB/T 2423.56-2006. introduction The broadband random vibration test of this part of GB/T 2423 is applicable to components, equipment and other products that will be subjected to random vibration during their lifetime. The product is called "test sample" in the following text. This test method is based on digitally controlled random vibration test technology. Relevant specifications such as As required, this section allows appropriate adjustments to the test method to apply to test samples of other types of products. Compared with most other experiments, the test Fh is not based on deterministic techniques but based on statistical techniques. Broadband Random Vibration Tests are described in terms of probability and statistical averages. It should be noted that random vibration tests always require a certain degree of engineering judgment, and both the supply and demand sides must fully realize this fact. Have The author of the relevant specification needs to choose the test method and the severity level suitable for the test sample and its application. This test method is mainly based on the use of an electric or a servo-hydraulic shaker with a computer-aided control system. Appendices A and B are informative appendixes that give examples of test spectra for tests under different conditions, detailed rules to be considered when preparing specifications, Guidelines. Environmental tests. Part 2. Test methods Test Fh. Broadband Random Vibration and Guidelines 1 Scope This part of GB/T 2423 provides the standard test method for random vibration to determine whether the sample is subjected to the specified random vibration test. The ability to resist dynamic loads without unacceptable functional degradation and/or compliance with the overall structure. Broadband random vibration can be used to identify cumulative effects of stress and degradation of specific functions. Combining this information with relevant specifications, you can Used to assess whether the sample is acceptable. This section applies to samples that may be subjected to random vibrations in the transport or work environment, such as in aircraft, spacecraft and land vehicles It is mainly used for samples without packaging, and samples whose packaging is part of the sample itself during transportation. However, for already For packaged samples, the samples together with their packaging are regarded as samples. For the test of packed samples, this section can be compared with GB/T 2423.43- Commonly used in.2008. If the sample is subjected to random and deterministic mixed vibration during transportation or actual life cycle environment, such as in aircraft, spacecraft and container transportation In losing, it is not enough to test the sample with purely random conditions. Refer to GB/T 2424.26-2008 to estimate the sample dynamic vibration ring Environment, and select the appropriate test method based on this. This section mainly applies to electrical and electronic products, but also applies to products in other fields (see Appendix A). 2 Normative references The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 2423.43-2008 Environmental test for electric and electronic products Part 2. Test methods Vibration, shock and similar dynamics Installation of test samples (IEC 60068-2-47..2005, IDT) GB/T 2424.26-2008 Environmental testing for electric and electronic products. Part 3. Supporting documents and guidelines for vibration test selection (IEC 60068-3-8..2003, IDT) IEC 60050-300 International Electrotechnical Terminology (IEV) Electronic measurement and electronic measuring instruments-Part 311. General principles of measurement Part 312. General principles of electronic measurement. Part 313. Classification of electronic measuring instruments. Part 314. Technical terms related to the type of instrument. IEC 60068-1 Environmental Testing Part 1. Overview and Guidelines (Environmental testing-Part 1. General and guidance) IEC 60068-2-6 Environmental Tests Part 2-6. Test Methods Test Fc. Vibration (Sine) (Environmental testing-Part 2-6. Tests-TestFc. Vibration (sinusoidal)] IEC 60068-5-2 Environmental Tests Part 5-2. Guidelines for the Preparation of Test Methods Terms and Definition IEC 60721-3 (all parts) Classification of environmental conditions Part 3. Classification of environmental parameter groups and their severity Preparation of IEC Guide104 safety publications and application guidelines for basic safety publications and multi-professional shared safety publications ISO 2041 Vibration and Shock-Vocabulary 3 terms and definitions The following terms and definitions apply to this document. Note. The terms used are generally defined in IEC 60050-300, IEC 60068-1, IEC 60068-2-6, IEC 60068-5-2 and ISO 2041. If this Including the definition of one of these sources will indicate the derivation process and point out deviations from the definitions in these sources. 3.1 Cross-axismotion The movement along the non-excitation direction is generally performed along two axes orthogonal to the excitation direction. Note. The lateral movement needs to be measured near the fixed point. 3.2 Actualmotion The movement represented by the wideband signal returned by the reference point sensor. 3.3 Fixingpoint The part of the test sample that is in contact with the fixture or shaker is usually the place where the test sample is fixed in use. Note. If a part of the actual mounting structure is used as a fixture, the fixed point refers to the fixed point of the mounting structure and not the fixed point of the test sample. 3.4 Controlmethods 3.4.1 Single point control A control method implemented by using a signal from a sensor at a reference point to keep the signal at a prescribed vibration level. 3.4.2 Multipoint control The method is controlled by sensor signals from various inspection points. Note. Whether the signal is processed by continuous arithmetic averaging or comparison technology is determined according to relevant specifications. See 3.13. 3.5 gn The standard acceleration due to the gravity of the earth varies with altitude and geographic latitude. Note. For ease of use, gn is rounded to 10m/s2 in this section. 3.6 Measuring points Certain points of data collected during the experiment. Note. These points are divided into three categories, see 3.7 ~ 3.9 for specific definitions. 3.7 Check-point The point on the fixture, vibration table or test sample, as close as possible to the fixed point of the test sample, and in any case Fixed point rigid connection. Note 1. The use of multiple checkpoints is a measure to ensure that the test requirements are met. Note 2. If there are less than or equal to four fixed points, all are used as checkpoints. For packaged products, the fixed point at this time is the packing table that the shaker contacts. On the other hand, if there is no resonance effect of the shaking table or mounting structure in the frequency range of the test, a checkpoint can be used. Otherwise need to use multiple points Control, but also refer to Note 3. If there are more than four fixed points, the relevant specifications need to specify 4 representative fixed points for inspection. Note 3. In special cases, such as for large or complex test samples, if the inspection point is not required to be close to the fixed point, it shall be specified in the relevant specifications. Note 4. When a large number of small test samples are installed on a fixture, or when a small test sample has many fixed points, a single checkpoint (i.e. (Reference point) to derive the control signal. This signal reflects the characteristics of the fixture, not the fixed point of the test sample. This only works if the fixture is fitted with a test sample It is only feasible if the lowest resonance frequency after the load is much higher than the upper limit of the test frequency. 3.8 Reference point (single-point control) The signal selected from the check points is used for test control to meet the requirements of this section. 3.9 Fictitiousreferencepoint (multipointcontrol) Points derived from multiple inspection points, either manually or automatically, are used for test control to meet the requirements of this section. 3.10 Responsepoints Points located at specific locations on the test sample. Data are obtained from these points for vibration response analysis. Note. These points are different from checkpoints or datum points. 3.11 Priority test axes preferredtestingaxes According to the actual situation, the three orthogonal axes corresponding to the weakest test samples are selected. 3.12 Sampling frequency The number of discrete amplitudes collected per second for digitally recording or representing a time course. 3.13 Multipointcontrolstrategies The method of calculating the reference control signal when using multi-point control. Note. For discussion of control methods in different frequency regions, see 4.7.1. 3.14 Average averaging The process of determining the control of the acceleration spectral density formed by arithmetically averaging the acceleration spectral densities on the spectral lines corresponding to multiple checkpoints. 3.15 Extreme (maximum or minimum) extremal (maximum or minimum) Determine the control acceleration spectral density formed by the maximum or minimum value of the acceleration spectral density on the corresponding spectral lines of multiple checkpoints process. 3.16 Crestfactor The ratio of the peak value to the root mean square value of the time history. [ISO 2041] 3.17 -3dB bandwidth-3dBbandwidth The frequency width between two points corresponding to 0.707 times the maximum response of a single resonance peak in the frequency response function. 3.18 Acceleration spectral density acceleration spectrum density; ASD When the bandwidth approaches zero and the averaging time approaches infinity, the addition of the central frequency narrowband filter on each unit bandwidth Mean squared speed signal. 3.19 Control acceleration spectral density Acceleration spectral density measured at a fiducial or virtual fiducial. 3.20 Control system loop This includes the following operations. --- Digitization of analog random signals on reference points or virtual reference points; --- Perform necessary data processing; --- Generate an updated analog drive signal for the vibration system power amplifier (see B.1). 3.21 Clipping of drive signals The limit of the maximum drive signal is expressed by a crest factor (see Figure 1). 3.22 Effective frequency range Frequency range from 0.5 times f1 to 2.0 times f2 (see Figure 1). Note. Because of the initial slope and falling slope, the effective frequency range is greater than the test frequency range between f1 and f2. 3.23 Acceleration spectrum density erroraccelerationspectraldensity The difference between the specified acceleration spectral density value and the control-implemented acceleration spectral density value. 3.24 Equalization The process of minimizing the acceleration spectral density error. 3.25 Final slope The part of the acceleration spectral density greater than f2 (see Figure 1). 3.26 Frequency resolution Be The width of the frequency interval in the acceleration spectral density, in hertz. Note. In order to calculate the specified acceleration spectral density in digital analysis, the sampling record is divided into several parts, and the reciprocal of the sampling length (T) of each part is Resolution. In the frequency range, the number of frequency lines is equal to the number of frequency intervals. 3.27 Acceleration spectrum density indicated acceleration spectral density The true acceleration spectral density read from the analyzer is affected by instrument error, random error, and system deviation. 3.28 Initial slope The portion of the acceleration spectral density that is less than f1 (see Figure 1). 3.29 Instrument error Errors caused by each analog link of the control system and its inputs. 3.30 Random error Due to the limitation of different actual averaging time and filter bandwidth, the acceleration spectral density estimation error. 3.31 Record A collection of equally spaced data points in the time domain for fast Fourier transform calculations. 3.32 Reproducibility The degree of consistency between the results of the same parameter and value measurement under the following different conditions. --- Different test methods; --- different measuring instruments; --- different observers; --- different laboratories; --- After a longer time interval relative to the duration of a single measurement; --- Different instrument usage habits. Note. The term "reproducibility" can also be applied when some of the above conditions are met. [IEC 60050-300, amendment] 3.33 Root-mean-squarevalue The root mean square values of all frequencies of the single-valued function in the interval f1 and f2 are the average of the squared average of the function values in the interval Square root value (see Figure 2). 3.34 Standard deviation According to the vibration theory, when the average value of the vibration amplitude is equal to 0, for a random time history, the standard deviation of the vibration is equal to the root mean square value (see figure 2). 3.35 Statistical accuracy The ratio of the true value of acceleration spectral density to the displayed value of acceleration spectral density. 3.36 Statistical degrees of freedom DOF When using the time averaging method to estimate the acceleration spectral density of random data, the statistical degree of freedom depends on the frequency resolution and the effective average time. (See Figure 3). 3.37 Test frequency range In the frequency range between f1 and f2 (see Figure 1), the relevant specifications need to specify that the ASD is a flat spectrum or other spectral shape. 3.38 True acceleration spectral density true acceleration spectral density Acceleration spectral density of a random signal acting on a test sample. 4 Test requirements 4.1 General requirements When testing, the entire vibration system including power amplifiers, vibration generators, test fixtures, test samples, and control systems should be full. Meet the necessary performance requirements. The standard test method generally consists of the following test sequences, which are applied to the mutually perpendicular axial directions in the test sample. 1) Check the initial vibration response with a low magnitude sine or random excitation (see 8.2); 2) Mechanical load or stress test with random excitation; 3) The final response check is compared with the results of the initial response check. Mechanical failure (see 8.2 and 8.5). When the dynamic response is known and irrelevant, or when sufficient data can be collected in the case of full-scale tests, the relevant regulations provide that No vibration response check is required before and after the test. 4.2 Basic movement Relevant specifications shall specify the basic movement of the fixed points of the test sample. These fixed points should have approximately the same operation in phase and amplitude. It should move linearly with respect to the direction of excitation. If it is difficult to achieve exactly the same motion at each point, multi-point control should be used. Note. For large structures and high frequency ranges, such as 20Hz ~.2000Hz, the dynamic characteristics of test samples may require multi-point control. 4.3 Lateral motion If required by the relevant specifications, the lateral motion shall be checked by applying sinusoidal or random vibrations as specified in the relevant specifications before the test, or During the test, additional monitoring channels of two orthogonal axes were used to check the lateral movement. When the acceleration spectral density of each frequency point of the checkpoint is measured on two axes that are perpendicular to each other, it should not exceed 500Hz. The specified value should not exceed -3dB of the specified value when it is below 500Hz. Root mean square value of total acceleration of any axis perpendicular to the specified axis It should not exceed 50% of the root mean square value of the specified axis. For example, in the case of small test samples, the relevant specifications can limit the acceleration of lateral movement Degree of spectral density to ensure that it does not exceed -3dB of basic motion. At some frequencies or for test samples with large sizes or high centroids, achieving these values may be difficult. Again, in this case It is also difficult to achieve these values when the relevant regulations specify a strict level with a large dynamic range. In this case, the relevant specifications Provision should be made for one of the following. a) Any lateral movement exceeding the above-mentioned values shall be recorded in the test report; b) Transverse movements known not to cause damage to the test specimen need not be monitored. 4.4 Installation The test samples shall be installed in accordance with the requirements of IEC 60068-2-47. In all cases, first select the curve when selecting the curve in IEC 60068-2-47 Multiply the square by the acceleration spectral density (ASD) or directly by the sine amplitude. 4.5 Measurement system The characteristics of the measurement system shall be such that the actual value of the measured vibration from a given axial point in the reference point is within the tolerance required by the test. The entire measurement system includes sensors, signal conditioners, data collectors and data processors, and its frequency response has a significant effect on measurement accuracy. influences. The frequency range of the measurement system should extend from 0.5 times the lowest frequency (f1) of the test to 2.0 times the highest frequency (f2) (see Figure 1). The frequency response of the measurement system in this frequency range should be flat and within ± 5%. Any further deviations outside this range should be Recorded in the report. Figure 1 Tolerance range, initial slope and final slope of acceleration spectral density (see B.2.3) 4.6 Vibration tolerance 4.6.1 ASD and rms values The indicated values of the specified acceleration spectral density including the instrument error and random error at the reference point in the specified direction are shown in f1 and f2 in Figure 1. Within ± 3dB tolerance range. Within f1 and f2, the calculated root mean square value of acceleration must not deviate from the root mean square value of the specified acceleration spectral density by 10% the above. This value applies to datum points and virtual datum points. At some frequencies or for test samples with large sizes or high centroids, it may be difficult to achieve these values. In these cases, relevant The specification should specify a wider tolerance. The initial and final slopes should be no less than 6dB/oct and no more than -24dB/oct, respectively (see also B.2.3). 4.6.2 Distribution As shown in Figure 2, the instantaneous acceleration value of the reference point should be approximately normal (Gaussian) distribution. If there is an explicit requirement, Verification shall be performed (see B.2.2). The clipping value of the drive signal should be at least 2.5 (see 3.16). Detect the crest factor of the acceleration waveform at the reference point to ensure that the signal contains the Set a peak value of at least 3 times the rms value, unless otherwise specified by the relevant specifications. If virtual reference point control is used, the required crest factor is applicable to all checkpoints that form acceleration spectral density control. The probability density functions used to calculate the reference points at the beginning, middle, and end of the test should each last 2 min. Relevant specifications should provide for normal analysis The tolerance of the cloth (see Figure 2). Figure 2 Time history of random excitation; Gaussian (normal) distribution probability density function (Crest factor = 3 as an example, see 3.14 and 4.6.2) 4.6.3 Statistical accuracy Statistical accuracy is determined by statistical degrees of freedom Nd and confidence values (see Figure 3). The statistical degrees of freedom are given by. Nd = 2Be × Ta (1) Where. Be --- frequency resolution; Ta --- effective average time; Nd --- Unless otherwise specified in the relevant specifications, Nd should not be less than 120DOF statistical degrees of freedom. If the relevant regulations stipulate that To meet the confidence level, Figure 3 should be used to calculate the accuracy of the statistical results. Figure 3 Relationship between statistical accuracy of acceleration spectral density and degrees of freedom at different... ......


GB/T 2423.56-2006 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 19.020 K 04 GB/T 2423.56-2006/IEC 60068-2-64.1993 Environmental Testing for Electric and Electronic Products - Part 2. Test Methods - Test Fh. Vibration, Broad-Band Random (Digital Control) and Guidance (IEC 60068-2-64.1993, IDT) ISSUED ON. NOVEMBER 08, 2006 IMPLEMENTED ON. APRIL 01, 2007 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC. Table of Contents Foreword ... 4 Introduction ... 5 1 Scope ... 6 2 Normative References ... 6 3 Definitions ... 7 4 Requirements for Testing... 12 5 Severities ... 16 6 Pre-conditioning ... 17 7 Initial Measurements ... 18 8 Testing ... 18 9 Recovery ... 20 10 Final Measurements ... 20 11 Information to be Given In the Relevant Specification ... 21 Appendix A (Normative) Vibration Response Investigation ... 28 Appendix B (Informative) Guidance ... 32 Appendix C (Informative) Conversion between Percentage Values and dB .. 45 Figure 1 – Tolerance Band for Distribution of Instantaneous Acceleration Values ... 22 Figure 2 – Tolerance Boundaries for Acceleration Spectral Density ... 22 Figure 3 – Gaussian (Normal) Probability Density Function ... 23 Figure 4 – Representation of Signal Clipping ... 23 Figure 5 – Non-Gaussian Probability Density Function after Clipping ... 24 Figure 6 – Statistical Accuracy of Acceleration Spectral Density versus Degrees of Freedom for Different Confidence Levels ... 24 Figure 7 – Relationship between Acceleration Spectral Density and Frequency ... 25 Figure 8 – Flow Chart for Vibration, Broad-Band Random Test ... 26 Figure 9 – Generalized Transmissibility Factors for Isolators ... 27 Foreword GB/T 2423 Environmental Testing for Electric and Electronic Products – Part 2. Test Methods can be divided into multiple parts according to the test methods. This Part belongs to Part 56 of GB/T 2423 serial standard. This Part equivalently adopted IEC 60068-2-64.1993 Environmental Testing for Electric and Electronic Products – Part 2. Test Methods – Test Fh. Vibration, Broad- Band Random (Digital Control) and Guidance (English Version); however, the following editorial modifications were made as per the 4.2b) and 5.2 of GB/T 20000.2-2001 Guides for Standardization – Part 2. Adoption for International Standards. a) Change “This Part of IEC 60086” into “this Part of GB/T 2423” or “this Part”; b) Use “decimal point” to replace “comma” acting as the decimal point; c) Delete the foreword of the international standard; d) To be consistent with other parts of GB/T 2423, change the name of this Part as the current name. Appendix A of this Part is normative; while Appendixes B, C are informative. This Part was proposed by China Electrical Association. This Part shall be under the jurisdiction of National Technical Committee for Standardization of Environment for Electric and Electronic Products (SAC/TC 8). Drafting organizations of this Part. Guangzhou University, The Fifth Electronics Research Institute of The Ministry of Industry and Information Technology, Shanghai Electronic Instrument Standard Measurement Testing Institute, Beihang University, No.301 Institute of Aviation Industry Corporation of China, Beijing Haidian Zhongyuan Micro Instrument Company, and Suzhou Experiment Instrument Factory. Chief drafting staffs of this Part. Xu Zhonggen, Ji Chunyang, Lu Zhaoming, Wang Deyan, Xu Ming, Xu Liyi, Zhang Yue, Ren Min, Yang Zequn, and Du Xueying. Environmental Testing for Electric and Electronic Products - Part 2. Test Methods - Test Fh. Vibration, Broad-Band Random (Digital Control) and Guidance 1 Scope This Part provides two standard test methods (method 1 and method 2) for determining the ability of a specimen to withstand specified severities of broad-band random vibration. Neither test method can be considered more severe than the other, the difference being primarily that method 2 provides more information to quantify the applied test, and is therefore more reproducible. It is also to reveal the accumulated effects of stress induced by random vibration, and the resulting mechanical weakness and degradation in specified performance and to use this information, in conjunction with the relevant specification, to assess the acceptability of specimens. In some cases. this Part may also be used to demonstrate the mechanical robustness of specimens and/or to study their dynamic behavior... This Part is applicable to specimens which may be subjected to vibration of a random 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. Although primarily intended for electrotechnical products, this Part is not restricted to them and may be used in other fields where desired. 2 Normative References The provisions in following documents become the provisions of this Part through reference in this Part. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Part, however, parties who reach an agreement based on this Part are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 2298-1991 Mechanical Vibration and Shock – Terminology (idt ISO 2041.1990) GB/T 2421-1999 Environmental Testing for Electric and Electronic Products - Part 1. General and Guidance (idt IEC 60068-1.1988) GB/T 2423.10-1995 Environmental Testing for Electric and Electronic Products - Part 2. Test Methods Test Fc and Guidance. Vibration (Sinusoidal) (idt IEC 60068- 2-6.1982) GB/T 2423.43-1995 Environmental Testing – Part 2. Mounting of Components, Equipment and Other Articles for Dynamic Tests including Shock (Ea), Bump (Eb), Vibration (Fc and Fd) and Steady-State Acceleration (Ga) and Guidance (idt IEC 60068-2-47.1982) GB/T 4796 Classification of Environmental Parameters and their Severities of Electric and Electronic Products (GB/T 4796-2001, idt IEC 600721-1.1991) IEC 60050-301.1983 International Electrotechnical Vocabulary (IEV) Chapter 301. General Terms on Measurements in Electricity IEC 60050-302.1983 International Electrotechnical Vocabulary (IEV) Chapter 302. Electrical Measuring Instruments IEC 60050-303.1983 International Electrotechnical Vocabulary (IEV) Chapter 303. Electronic Measuring Instruments (Advanced Edition) IEC 60068 Environmental Testing IEC 60068-2 Environmental Testing – Part 2. Tests 3 Definitions The terms used are generally defined in GB/T 2298-1991 or IEC 60050 (301, 302, 303).1983 and in GB/T 2421-1999 or GB/T 2423.10-1995. Where, for the convenience of the reader, a definition from one of those sources is included here, the derivation is indicated and departures from the definitions in those sources are also indicated. The additional terms and definitions that follow are also applicable for the purposes of this Part. 3.1 -3dB bandwidth (Br) Frequency bandwidth between two points in a frequency response function which is 0.707 of the maximum response when associated with a single resonance peak (see 4.3.6.2). [GB/T 2298-1991, modification] ......

Similar standards: GB/T 2423.65-2024  GB/T 2423.55-2023  
Similar PDFs (Auto-delivered in 9 seconds): GB/T 2423.56-2023  GB/T 2423.51-2020  GB/T 2423.61-2018  GB/T 2423.5-2019