Vibration / shock / drop test criteria

Vibration / shock / drop test standard 1.0 reliability test purpose overview of vibration test overview of impact test overview of drop test 2.0 test items and test conditions 2.1 test procedure vibration axial discrimination test piece placement acceleration gauge correct filling fixation vibration test piece impact test condition drop method and sequence requirements drop test condition Test report 3.0 test environment requirements secondary laboratory environment Requirements ISO / IEC 17025 (1999) general test laboratory environment requirements CNS 1 Reliability test purpose In recent years, due to the high development of industry and the continuous updating of technology, the structure of various product systems is increasingly complex and more precise A system is often composed of thousands of components If a part is suddenly damaged in use, the system function will not be fully developed if it is light, and the whole system will lose its function if it is heavy Therefore, the product must withstand the test of various environments, and to ensure that the product can be used safely, reliably and durably in the hands of customers after formal production, the reliability must be designed in the product quality during the research and development period, so the test work is indispensable The test is a method to evaluate the system reliability, and also an important stage of Zui, during the use process Compared with the theoretical derivation, the reliability evaluation of the data and phenomena of is much more accurate The more evidence data, the greater confidence in the estimated reliability But the failure to conduct test or test to a certain degree or above does not mean that the product system is not reliable, but the degree of product reliability is not known at all 1.1 overview of vibration test the purpose of vibration test is to make a series of controllable vibration simulation in the laboratory, to test whether the product can withstand the test of vibration environment in transportation or use in the life cycle, and to determine the product design and functional requirements The essence of vibration test is to confirm the reliability of the product, screen out the defective products before leaving the factory in advance, and evaluate the failure analysis of the defective products to become a high-level, high reliability product All goods and commodities must go through different handling processes before they are delivered to customers In this process, there will be vibration in different states, resulting in different degrees of product damage Any damage to the products is not what the manufacturers and customers are willing to see, but the vibration in the transportation process is inevitable If we increase the cost of packaging blindly, it will bring unnecessary waste On the contrary, fragile packaging will cause high cost of products and lose its market competitiveness 1.2 overview of impact test impact test mainly focuses on the possible impact effects of simulation equipment and components during use and transportation, and analyzes the ability of products to withstand external impact environment through instantaneous energy exchange of shock wave The purpose of the test is to understand the weakness of mechanical structure and degradation of specific functions, which is one of destructive tests, It is helpful to understand the structural strength, appearance impact resistance, drop and other characteristics of the product If another destructive test is carried out, it can more effectively predict the reliability of the product and monitor the manufacturing consistency of the production line 1.3 overview of drop test Package dropping test is to test whether the anti vibration and covering protection ability of the packaging materials and the anti dropping degree of the product itself are sufficient for the finished products, so as to judge the relevant packaging design, material selection and improvement points Package dropping test is helpful for consumers to judge whether it is suitable for their own use according to the accepted package dropping test items when purchasing packaging materials Considering the environmental stress in the future, the strength basis of packaging materials is required 2.0 test items and test conditions during the implementation of this standard, various vibration modes are applied to products according to the specified categories to define the reliability value and damage boundary degree of products 2.1 test procedure (1) appearance inspection: a the test piece shall be the actual product or trial product If the trial product is used, its scale, quality, structure and function must be the same as that of the product B The appearance shall be free of deformation, scratch, rust mark and stain Function inspection: A each piece shall be tested for at least one cycle of test time B Each cycle test shall include test program and test program; each test unit shall not have the condition that the function does not conform to or exceeds the allowable difference, and test the functions of buttons, knobs, switches, indicator lights and regulators in sequence (3) Number of samples: samples shall be taken according to the large number of Zui tests that can be provided by the actual products, or according to the following reference values, and it shall be noted that the number of samples shall be distributed in an average and random manner on each production line, shift, personnel, etc., so as to avoid losing the reference value of test results due to sampling technical errors (4) Test condition and specification review: according to the test acceleration, test severity, test time, test axis and clamping fixture holding method specified in the specification Check the relevant conditions, and confirm whether the vibration test equipment used is sufficient to meet the test conditions (5) Pretreatment: A confirm whether the function and relevant settings of vibration test equipment meet the standards B Prepare all data recording facilities required in the relevant test process.