Design And Analysis Of Environmental Stress And Vibration Screening Test For Cabins

The vibration screening of cabin products is a part of environmental stress screening.The main purpose of screening is to find the defects before leaving the factory and make up for the defects in time,so that the products out of the factory have more quality assurance.Because the screening method and parameter factors have a great influence on the screening effect of the product,different laboratories are very different according to different product screening methods.The country has only carried out the general test parameter range for a certain application product.It is considered that the parameters do not exceed a certain range and the results can meet the range of application requirements.This scope is broader,and the parameters used by the testers of different products are not the same,although the results are obtained.The test results are qualified,but the impact on the product is very different.The vibration screening test of military products can not be carried out many times,because the vibration screening test itself is a kind of failure test,when the number of tests is too many,it will lead to the destruction of the product when it does not leave the factory.Therefore,it is the key factor to determine the test conditions of environmental stress screening according to the use characteristics of different products.In this essay,the effects of test parameters of random vibration and other influencing factors on the screening effect of products are studied.The main contents include two aspects: the design of environmental stress vibration screening test and the analysis of test results.Subject research The main contents are as follows: firstly,the structural dynamic simulation of the product is carried out,the inherent characteristics of the product are obtained,and the fixture is designed according to the vibration conditions of the laboratory,and the random vibration simulation is carried out to simulate the real vibration test environment,and the vibration response of the product is obtained.According to the simulation results,the specific range of boundary conditions of random vibration test is determined.Through the analysis of a large number of test data,the distribution parameter equation including comprehensive error parameters is established,the optimal measuring point is obtained by calculation,and the theoretical range of all test conditions is determined.After the boundary conditions of the test are determined,the loading scheme of the test is designed according to the theoretical conditions,and the results of the theoretical simulation are verified by the experimental results.Then,the response analysis of the test results is carried out,and the cepstrum analysis method is proposed to identify the response inversely,which can effectively monitor the state of the product.