GB 2423.39-1990 Basic environmental testing procedures for electrical and electronic products Test Ee: Bounce test method
Some standard content:
National Standard of the People's Republic of China
Basic environmental testing proceduresfor electric and electronic productsTest Ee: Bounce
1 Subject content and scope of application
GB 2423.39--90
This standard specifies the characteristics of the bounce test method and the bounce test machine, which is used to simulate the random impact and collision environment encountered by electric and electronic products in road vehicle transportation.
This standard is mainly applicable to equipment-type products and packaging ready for transportation, and its transport box or transport frame can be regarded as a part of the product itself. It is used to determine the adaptability to dynamic stress caused by random impact during transportation and (or) evaluate the structural integrity of the product.
2 Reference standards
GB2421 General provisions of basic environmental testing procedures for electric and electronic products GB2422 Basic environmental testing procedures for electric and electronic products Terminology 3 Relevant provisions
3.1 Characteristics of the bounce test machine
3.1.1 Composition of the test machine
The bounce test machine consists of a table body (work table, fence), two pairs of eccentric mechanisms, a transmission device and a mounting seat, as shown in Figure A2. The work table is made of a 25±1mm thick laminate. The fence is made of a 50mm thick pine board or a material with similar elasticity to the pine board.
3.1.2 Amplitude of displacement of the test machine work table
The movement of the eccentric mechanism should cause the work table to produce a vertical displacement, and the peak-to-peak value in the area between the drive shafts is 25±1mm. The installation of the two eccentric mechanisms should make the horizontal accuracy of the longitudinal and transverse axes of the work table within 0.5° (excluding bearing and mechanism clearance). However, for method B (see 5.2), the table with eccentric mechanism should be inclined at an angle of 10° to 30° in the long axis direction towards the driven axis when it is at the lowest point. 3.1.3 Fence
The fence is used to limit the horizontal movement of the sample. For method B (see 5.2), the fence height should be 50±25 mm lower than the sample. For method A (see 5.1), it should be at least the sample height. Otherwise, for both method A and method B, the fence height from the work surface should not exceed 600 mm.
3.1.4 Table acceleration
The magnitude of the acceleration generated by the work surface is controlled by the speed output by the reduction mechanism. The actual acceleration value experienced by the sample does not need to be measured.
3.1.5 Installation
Approved by the State Administration of Technical Supervision on August 28, 1990 372
Implemented on May 1, 1991
GB2423.39---90
For the purpose of this test, the samples prepared for transportation with or without a transport box or frame should be placed freely (not fixed) in the center of the table during the conditional test.
4 Severity level
The severity level of the bounce test is determined by the duration of the test and is selected from the following values: 5, 15.60, 180min. The above time is the total duration of the test and should be evenly distributed in each specified test position. Appendix A gives the selection method of the test severity level related to typical applications. Note: The two lower levels are usually used for samples with specific placement requirements during transportation. 5 Test Methods
5.1 Method A—Synchronous Circular Motion
For synchronous circular motion, the table is always in a horizontal position and each point on the table moves in a circle with a diameter of 25 ± 1 mm in the vertical plane.
The acceleration of the table is achieved directly by an average speed of 285 ± 3 r/min and does not need to be measured. The maximum horizontal motion of the specimen is 50 ± 5 mm. This value is ensured by a fence, that is, when the specimen is placed in its normal position at the center of the table, there should be a nominal free motion clearance of 25 mm between the specimen and the fence. 5.2 Method B—Asynchronous Motion
For asynchronous motion, the motion of the table is generated by two nominal actuators with a minimum distance of 600 mm and a maximum distance of 1700 mm (see Figure A1) and alternates between linear vertical motion and oscillation. The distance between the two driving points should be greater than the longest basic dimension of the specimen under test. Note: When testing large samples, if the test device is not suitable, this should be recorded in the test report. The driving frequency ratio of the two driving points, that is, the low-frequency driving point and the high-frequency driving point, is 0.9 ± 0.03, and the average speed of the higher-speed shaft is 285 ± 3 r/min
The amplitude of the lateral movement perpendicular to the linear vertical movement should be nominally zero because it comes from the engineering error of the drive system. The maximum value of the horizontal movement of the sample should be adjusted to between 100 and 150 mm. This value is guaranteed by the fence, that is, when the sample is placed in the center of the workbench in its normal position, there should be a nominal value of 50 to 75 mm of free movement between the sample and the fence. 6 Test procedure
6.1 Initial inspection
The sample should be inspected for appearance and tested for mechanical and electrical properties in accordance with the provisions of the relevant standards. 6.2 Conditioning test
When the projection ratio (ratio of the longest side to the shortest side) of the sample does not exceed 3:1 and the mass does not exceed 50kg, it shall be subjected to bouncing on each side (e.g. 3 sides for circular samples and 6 sides for rectangular samples). During the test, the sample is positioned with two horizontal orthogonal axes (i.e. parallel to the longest side and the shortest side respectively) and at right angles to the drive axis of the bouncing tester in turn (a total of 12 positions). For samples with larger projection ratios or larger masses or larger shapes, or certain samples whose transportation positions are restricted, the test shall be carried out in accordance with the requirements of the relevant standards.
For samples transported with only one mounting surface or a limited number of mounting surfaces, the relevant standards shall specify the positions of the samples to be tested. If required by the relevant standards, the total height of the small-sized samples in the stacking test shall not exceed 1m. In order to limit the highest test sample, the relevant standards shall specify the arrangement of the fence. bZxz.net
During the conditioning test, the product does not need to be checked for operation and function. Except for the 5-min severity level, in order to prevent excessive increase in the internal temperature of the sample, during the entire test phase, it may be allowed to bounce for 5 minutes and then resume (pause) for 5 minutes or more according to the provisions of the relevant standards. 6.3 Final test
GB 2423.3990
The sample shall be subjected to visual inspection and mechanical and electrical performance tests according to the provisions of the relevant standards. Contents of the relevant standards
When the relevant standards adopt this test method, they shall have the following contents: a.
Fence arrangement (see 3.1.3);
Test method (see Chapter 5);
Test position (see 6.2);
Severity level (see Chapter 4);
Initial test (see 6.1);
Stacking requirements (see 6.2);
Final test (see 6.3).
A1 Overview
GB2423.39-90
Appendix A
(Supplement)
The purpose of this test is to produce in the sample random impact similar to that experienced during transportation. Non-fixed equipment may be subject to bouncing on the floor of the vehicle, collision and friction with the floor of the vehicle, and collision with the side panels of the vehicle or other goods when transported by land. Products that are tied or strapped to the floor of the vehicle will also be subject to similar situations if this restraint still has a small degree of freedom.
The severity of these impacts depends on the position of the product in the vehicle, the type of road surface (such as potholes, off-grade roads), the cumulative transportation time, and the special dynamic characteristics of the product. Products with high rebound characteristics (such as packages) are prone to bounce when colliding with the vehicle floor, and are more likely to collide with the vehicle side panels and other goods. Inelastic products can be in close contact with the vehicle floor and will generally not be subject to severe random impacts.
The bounce test can achieve a function similar to the collision test, but because the sample is not fixed on the test bench, it can more realistically simulate the stress caused by the random impacts mentioned above when the product is transported in bulk (Article 6.2). A2-related tests
a. Test Ea: Impact
This test is used to simulate the effects of non-repetitive impacts that equipment and components may be subjected to during transportation or in use. b. Test Eb: Collision
This test is used to simulate the effects of multiple repetitive collisions that equipment and components may be subjected to during transportation or when installed in different types of vehicles.
c. Test Ec:Tumble and Overturn
This test is a simple test to determine the impact and knocks that equipment-type products may be subjected to during maintenance or rough handling on the workbench.
d. Test Ed: Free fall, repeated free fall Free fall is a simple test to determine the impact of falling that may be caused by rough handling. It can also be used to verify the strength level of equipment. Repeated free fall is used to simulate the repeated impact that certain component-type products, such as connectors in use, may be subjected to. A3 Fence Installation Method
The fence is installed on the workbench to simulate the collision between the product and the baffle. There should be a specified distance between the fence and the product, and the inner wall should be wooden. Or this strip is inlaid on the channel steel, or square wood with a square cross-section is used. The typical installation method and arrangement of the fence are shown in Figure A2 (see 3.1.3, 5.1, and 5.2).
A4 Bounce Test Method
The bounce test method is shown in Chapter 5. Method A is based on the movement of the table, which produces an average acceleration of not more than 10m/s2 in the vertical plane by specifying the displacement amplitude and the rotation speed, the vertical movement produces a bounce, and the horizontal movement produces an occasional collision with the fence wall. Method B is based on the non-synchronous movement of the table, in which the two input points are driven at different speeds, which leads to a gradual alternation from linear vertical movement to tilting movement, the vertical movement produces a bounce, and the tilting movement produces a collision with the baffle plate. The mechanism that produces this movement is shown in Figure A1. At the current state of the art, based on the experience of users, in the simulated transport environment, when the transport test is lower than or equivalent to the environment simulation of the bounce test, the two methods can be considered to have the same effect. However, in order to produce the same effect on the product during the test. The test time needs to be selected according to the test method, see Chapter A5. Similarly, since the movement of the test machine table is different for the two methods, different spacings between the sample and the fence must be specified. When the test is carried out by method B, the motion to which the sample is subjected is almost similar in severity to the situation in which the product is transported in bulk on the rear axle of a four-wheel truck on a bumpy road at a speed of 10 to 15 km/h. A5 Test Severity Level
The relevant standard must specify the test method used. The severity level of the bounce test is determined by the test duration. There are 4 severity level values in Chapter 4 of this standard. The two longest severity levels of 60min and 180min are used for products that are transported from off-grade roads or on severely bumpy roads or on truck trailers, as well as long-distance transportation (or where cumulative damage can occur). The two shorter test severity levels of 5min and 15min are used for products that are transported in bulk on trucks for short distances, or in the process of delivery to the user, which may sometimes be transported from highways to bumpy roads, paved roads, and washboard roads. It has been found through experiments that the environment of the product in the package when the truck is transported back and forth on unpaved roads is similar to the bounce environment that occurs in the bounce test. However, a bounce test machine can produce time compression. A test of 5 min duration for method A, or 2 min duration for method B, is equivalent to a 10 min truck transport on an unpaved road. Figure A3 shows the peak acceleration measured on the packaged test product when the truck is transported on an unpaved road or a pothole road, and the results obtained by the two test methods in this standard are compared.
A6 Bounce test axis and direction
The test axis and direction (see 6.2) should be selected to represent the product during transportation. Products that are always transported on their normal base need only be subjected to the bounce test placed on that base. For products that can be transported on more than one placement surface, the test should be carried out on each relevant surface in accordance with the requirements of the relevant standard. In order to simulate the impact with the vehicle fender and other cargo, the product placed on each relevant surface shall be rotated 90° in the horizontal plane so that the impact with the test machine fence is applied to each vertical plane. See Figure A4 and Table A1. The test time for each axis and each direction shall be equal as required by the relevant standards. Note: Two lower severity levels are usually applied to transport products under specified conditions and special requirements. A7 Multi-layer stacking test
When products are transported in two or more layers on a truck, there is a great difference in the environment to which the top and bottom layers are subjected. For packaged items, the bottom layer of the product may be damaged. In this case, a multi-layer stacking test should be carried out (see 6.2). A8 Functional inspection
A8.1 Components and equipment
Product damage, although it can be detected by performance changes, is usually of a mechanical nature, such as loose screws, mechanical parts and (or) connection damage. After the test, special attention should be paid to the type of damage and possible impact on performance. A8.2 Packaging
In evaluating packaging performance, products with packaging boxes and transport frames should pay attention to any looseness of screws or fastenings. For damage to the packaging box or the product inside, the strength and position of the load transfer parts, the downward movement of any lower layer cushioning material, and the decline of space fillers should be checked. It is also necessary to check the wear, loosening of the outer packaging plate, damage to the protective cover, etc. that may be caused by the test, which may cause damage to the weather protection. 376
Dimensions in the figure:
GB 2423.39-90
Figure AI Basic drive mechanism (non-synchronous motion) A--not less than 600mm, not more than 1700mm; B--greater than 250mm
-(20%~~30%) A, mm;
D -—- (3%~13%) A, mm.
GB2423.3990
Figure A2 Two typical installation and arrangement of fences
GB2423.39—90
Truck: 60min
Bounce: 30min, asynchronous, 1:0.9
Bounce: 30min. Interval
Speed m/s
Figure A3 Acceleration distribution of truck transportation and bounce test machine on packaged products 379
GB 2423.39—90
Figure A4 Main axis of rectangular products
Orientation and sequence of bounce test for rectangular products Table A1
Product orientation relative to the long axis of the platform
Serial number of the top surface (upper side)
Additional notes:
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard was drafted by the Fifth Research Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Wang Shurong, Zhang Dinghua, Wang Yuchun and Zhang Peifen.39-90
Products produce the same effect. The test time needs to be selected according to the test method, see Chapter A5. Similarly, since the movement of the test machine table is different for the two methods, different spacings between the sample and the fence must be specified. When testing with method B, the movement to which the sample is subjected can be almost similar in severity to the situation where the product is transported in bulk on the rear axle of a four-wheel truck on a pothole road at a speed of 10 to 15 km/h. A5 Test Severity Level
The relevant standard must specify the test method used. The severity level of the bounce test is determined by the test duration. There are 4 severity level values in Chapter 4 of this standard. The two longest severity levels of 60min and 180min are used for products that are transported from off-grade roads or on severely potholes or on trailers of trucks, as well as long-distance transportation (or cumulative damage). The two shorter test severity levels of 5 min and 15 min are used for products that are transported short distances in bulk on trucks or that may occasionally be transported from highways to potholes, paved roads, or washboard roads during delivery to the user. It has been found that the environment in the package when the truck is transported back and forth on unpaved roads is similar to the bounce environment that occurs in the bounce test. However, the bounce test machine can produce time compression. For method A, a test duration of 5 min, or for method B, a test duration of 2 min, is equivalent to a truck experiencing 10 min of transportation on unpaved roads. Figure A3 shows the peak acceleration measured on the packaged test product when the truck is transported on unpaved roads or potholes, and the results obtained by the two test methods in this standard.
A6 Bounce test axis and direction
The test axis and direction (see 6.2) should be selected to represent the conditions of the product during transportation. Products that are always transported on their normal base need only be subjected to the bounce test placed on that base. For products that can be transported on more than one side, the test should be carried out on each side in accordance with the requirements of the relevant standards. In order to simulate the impact with the vehicle fender and other cargo, the products placed on each side need to be rotated 90° in the horizontal plane so that the impact with the test machine fence is applied to each vertical plane. See Figure A4 and Table A1. According to the requirements of the relevant standards, the test time for each axis and each direction should be equal. Note: Two lower severity levels are usually applied to products transported under specified conditions and special requirements. A7 Multi-layer stacking test
When products are transported in two or more layers on a truck, there is a great difference in the environment experienced by the top and bottom layers. For packaged products, the bottom layer of the product may be damaged. In this case, the multi-layer stacking test should be carried out (see 6.2). A8 Functional inspection
A8.1 Components and equipment
Product damage, although it can be detected by performance changes, is usually of a mechanical nature, such as loose screws, mechanical parts and (or) connection damage. After the test, special attention should be paid to the type of damage and possible impact on performance. A8.2 Packaging
In the evaluation of packaging performance, products with packaging boxes and transport frames should be checked for any looseness of screws or fastenings. For damage to the packaging box or the products therein, the strength and position of the load transfer parts, the downward movement of any lower cushioning material, and the decline of the space filler should be checked. It is also necessary to check for wear and tear that may occur due to the test, loosening of the outer packaging board, damage to the protective cover, and thus damage to the weather protection. 376
Dimensions in the figure:
GB 2423.39-90
Figure AI Basic drive mechanism (non-synchronous motion) A--not less than 600mm, not more than 1700mm; B--greater than 250mm
-(20%~~30%) A, mm;
D -—- (3%~13%) A, mm.
GB2423.3990
Figure A2 Two typical installation and arrangement of fences
GB2423.39—90
Truck: 60min
Bounce: 30min, asynchronous, 1:0.9
Bounce: 30min. Interval
Speed m/s
Figure A3 Acceleration distribution of truck transportation and bounce test machine on packaged products 379
GB 2423.39—90
Figure A4 Main axis of rectangular products
Orientation and sequence of bounce test for rectangular products Table A1
Product orientation relative to the long axis of the platform
Serial number of the top surface (upper side)
Additional notes:
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard was drafted by the Fifth Research Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Wang Shurong, Zhang Dinghua, Wang Yuchun and Zhang Peifen.39-90
Products produce the same effect. The test time needs to be selected according to the test method, see Chapter A5. Similarly, since the movement of the test machine table is different for the two methods, different spacings between the sample and the fence must be specified. When testing with method B, the movement to which the sample is subjected can be almost similar in severity to the situation where the product is transported in bulk on the rear axle of a four-wheel truck on a pothole road at a speed of 10 to 15 km/h. A5 Test Severity Level
The relevant standard must specify the test method used. The severity level of the bounce test is determined by the test duration. There are 4 severity level values in Chapter 4 of this standard. The two longest severity levels of 60min and 180min are used for products that are transported from off-grade roads or on severely potholes or on trailers of trucks, as well as long-distance transportation (or cumulative damage). The two shorter test severity levels of 5 min and 15 min are used for products that are transported short distances in bulk on trucks or that may occasionally be transported from highways to potholes, paved roads, or washboard roads during delivery to the user. It has been found that the environment in the package when the truck is transported back and forth on unpaved roads is similar to the bounce environment that occurs in the bounce test. However, the bounce test machine can produce time compression. For method A, a test duration of 5 min, or for method B, a test duration of 2 min, is equivalent to a truck experiencing 10 min of transportation on unpaved roads. Figure A3 shows the peak acceleration measured on the packaged test product when the truck is transported on unpaved roads or potholes, and the results obtained by the two test methods in this standard.
A6 Bounce test axis and direction
The test axis and direction (see 6.2) should be selected to represent the conditions of the product during transportation. Products that are always transported on their normal base need only be subjected to the bounce test placed on that base. For products that can be transported on more than one side, the test should be carried out on each side in accordance with the requirements of the relevant standards. In order to simulate the impact with the vehicle fender and other cargo, the products placed on each side need to be rotated 90° in the horizontal plane so that the impact with the test machine fence is applied to each vertical plane. See Figure A4 and Table A1. According to the requirements of the relevant standards, the test time for each axis and each direction should be equal. Note: Two lower severity levels are usually applied to products transported under specified conditions and special requirements. A7 Multi-layer stacking test
When products are transported in two or more layers on a truck, there is a great difference in the environment experienced by the top and bottom layers. For packaged products, the bottom layer of the product may be damaged. In this case, the multi-layer stacking test should be carried out (see 6.2). A8 Functional inspection
A8.1 Components and equipment
Product damage, although it can be detected by performance changes, is usually of a mechanical nature, such as loose screws, mechanical parts and (or) connection damage. After the test, special attention should be paid to the type of damage and possible impact on performance. A8.2 Packaging
In the evaluation of packaging performance, products with packaging boxes and transport frames should be checked for any looseness of screws or fastenings. For damage to the packaging box or the products therein, the strength and position of the load transfer parts, the downward movement of any lower cushioning material, and the decline of the space filler should be checked. It is also necessary to check for wear and tear that may occur due to the test, loosening of the outer packaging board, damage to the protective cover, and thus damage to the weather protection. 376
Dimensions in the figure:
GB 2423.39-90
Figure AI Basic drive mechanism (non-synchronous motion) A--not less than 600mm, not more than 1700mm; B--greater than 250mm
-(20%~~30%) A, mm;
D -—- (3%~13%) A, mm.
GB2423.3990
Figure A2 Two typical installation and arrangement of fences
GB2423.39—90
Truck: 60min
Bounce: 30min, asynchronous, 1:0.9
Bounce: 30min. Interval
Speed m/s
Figure A3 Acceleration distribution of truck transportation and bounce test machine on packaged products 379
GB 2423.39—90
Figure A4 Main axis of rectangular products
Orientation and sequence of bounce test for rectangular products Table A1
Product orientation relative to the long axis of the platform
Serial number of the top surface (upper side)
Additional notes:
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard was drafted by the Fifth Research Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Wang Shurong, Zhang Dinghua, Wang Yuchun and Zhang Peifen.39—90
Figure A4 Main axis of rectangular products
Orientation and sequence of bounce test for rectangular products Table A1
Orientation of products relative to the long axis of the platform
Serial number of the top surface (above)
Additional instructions:
This standard was proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard was drafted by the Fifth Research Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Wang Shurong, Zhang Dinghua, Wang Yuchun and Zhang Peifen.39—90
Figure A4 Main axis of rectangular products
Orientation and sequence of bounce test for rectangular products Table A1
Orientation of products relative to the long axis of the platform
Serial number of the top surface (above)
Additional instructions:
This standard was proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard was drafted by the Fifth Research Institute of the Ministry of Machinery and Electronics Industry. The main drafters of this standard are Wang Shurong, Zhang Dinghua, Wang Yuchun and Zhang Peifen.
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