GB/T 2424.20-1985 Basic environmental testing procedures for electrical and electronic products Guidelines for tilt and swing tests GB/T2424.20-1985 Standard download decompression password: www.bzxz.net

Scope of application
National Standard of the People's Republic of China
Basic environmental testing procedures for electric and electronic productsGuidance for test simulatinginclinations and motions
UDC 621.3
:620.178.3
GB 2424.20—85
Tilt and sway are a basic environment for electric and electronic products installed on ships, and all kinds of products must withstand the effects of this environment. However, in terms of product adaptability and structural reliability, according to previous practices, not all electric and electronic products installed on ships must undergo this environmental test.
Tilt test is mainly applicable to products that must maintain normal or reliable operation when the ship is tilted at a large angle due to marine damage, manipulation, unbalanced loading and wind, as well as products whose operating performance will be significantly affected by the tilt environment. Such influences generally include:
leading to the destruction of the original force balance in the product system; changes in the bearing force conditions,
deterioration of the bearing lubrication conditions;
malfunction due to changes in the position of the internal free liquid surface; leakage of internal liquid.
The swing test is mainly applicable to products that must maintain normal or reliable operation during a long period of swaying due to external forces such as wind and waves, and products that will have a significant impact on their working performance under the swaying environment. Such influences generally include: the additional inertial force generated by the swaying may cause additional dynamic loads and cause product malfunction or structural damage; leading to the destruction of the original force balance in the product system; changes in the bearing force conditions;
deterioration of the bearing lubrication conditions;
malfunction due to the turbulence of the internal free liquid surface position; leakage of internal liquid.
Products with working accuracy requirements in tilting and swaying environments must undergo this test. For products that have been confirmed to not have the above-mentioned influences, this test may not be performed after approval by relevant parties. For products that cannot be tested due to weight or other reasons due to the above-mentioned influences, the handling method shall be in accordance with the provisions of the relevant standards. 2 Selection of test severity level
The developer of the relevant standards who intend to adopt this test method shall compile it in accordance with the provisions of Chapter 6 "Contents to be included in the relevant standards" in GB2423.31--85 "Basic Environmental Test Procedures for Electrical and Electronic Products - Tipping Bucket and Swing Test Methods". The selection of the test severity level should mainly be based on the tilting and swaying environment that may occur on the ship where the product is installed, and should be selected from Tables 1 and 2 of this guideline, or it may be separately specified by the relevant standards. The test severity level selected by the developer of the relevant standards shall be agreed upon by the user. Issued by the State Bureau of Standards on May 15, 1985
Implemented on February 1, 1986
Tilt form
Swing form
GB2424.20—85
Table 1 Examples of typical severity levels of tilt tests Test severity level
Tilt angle
Sway amplitude
± 10°
Test duration
Equipment for coastal and ocean-going ships with a length of more than 150m Fore and aft, not less than 15min each
Left, not less than 15min each
Equipment on inland vessels
Equipment on coastal and ocean-going ships with a length of less than and equal to 150m Equipment on inland ships
General equipment on coastal and ocean-going ships
Emergency equipment on coastal and ocean-going ships Equipment on coastal and ocean-going vessels with a ratio of length to breadth less than or equal to 3, and equipment on offshore platforms Table 2 Examples of typical sway test severity Test severity
5s, 7s
3s, 5s, 7s
5s, 7s, 10s
5s, 7s, 10s
Test duration
Not less than 30min
Not less than 30min
Not less than -30min
Not less than 30min
Not less than 30min
Not less than 30minbZxz.net
Not less than 30min
Not less than 30min
Not less than 30min
Coastal and ocean-going vessels with a length of more than 150m Equipment on ships Equipment on coastal and ocean-going ships with a length of less than or equal to 150m Equipment on general coastal and ocean-going ships
Emergency equipment on small coastal and ocean-going ships Equipment on general coastal and ocean-going ships
Equipment on general coastal and ocean-going ships
Equipment on small coastal and ocean-going ships
3 Selection of test forms
GB2424.20--85
The six forms of sway that may be produced by actual ships may not all exist at the same time. The sway form produced is mainly determined by the heading position of the ship relative to the waves. The intensity of each form of sway is not only affected by the relative heading, but also by the ship parameters, wind and wave parameters, and relative speed. Therefore, when choosing the form of sway test for a product, it should be mainly determined by which one will have a significant impact on the product performance or structure. - Generally, rolling, pitching, and heaving are the main ones. When the relevant standards stipulate that a composite test of several forms of swing is to be conducted, the relevant standards should reasonably stipulate the test severity level and corresponding test parameters for each form of swing according to the possible real environment. When conducting a composite test, it is unrealistic and unreasonable to select the highest test severity level for each swing form at the same time. Reasonable coupling should be to stipulate the swing form that has the main impact on product performance as the highest test severity level, and to reduce the test severity level of other minor swing forms accordingly. For example, when conducting a composite test of pitch and roll, when the highest test severity level is stipulated for the main swing form, the test severity level of another swing form only needs to be 50% to 60% of its highest test severity level.
It should be considered that random swing tests can be used to simulate the real environment more accurately. 4 Typical application examples of test severity levels
Typical test severity level examples are listed in Tables 1 and 2 for reference by relevant personnel when selecting test severity levels. Additional Notes:
This standard should be used together with the following standards: GB2421-81 "General Principles of Basic Environmental Test Procedures for Electrical and Electronic Products" GB2422-81 "Terms and Terms of Basic Environmental Test Procedures for Electrical and Electronic Products" GB2423.31-85 "Tilting and Swinging Test Methods of Basic Environmental Test Procedures for Electrical and Electronic Products" This standard was proposed by the National Technical Committee for Environmental Technical Standardization of Electrical and Electronic Products. This standard was drafted by the National Technical Committee for Environmental Technical Standardization of Electrical and Electronic Products. The main drafter of this standard is Ren Daxiang.
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