Research On Reliability Evaluation Method Of Spring For Water Acoustic Jammer Bullet Based On Multivariate Random Degradation Proces

Underwater acoustic interference bullet has the advantages of high sound source level,wide frequency range,high energy conversion rate and low cost,so it has a significant interference effect on torpedo tracking and a high cost-effectiveness ratio.It is found that when the function of the slider-spring of a certain underwater acoustic interference bullet fails,it will cause the abnormal operation of the detonation transmission unit and lead to the failure of the bullet to detonate in time.The analysis of failure test shows that the slider spring is a device with high failure rate in bullet system.The reliability analysis of slide spring is helpful to improve the overall reliability of underwater acoustic interference bullet system.Therefore,the research on reliability life evaluation method of a certain underwater acoustic interference bullet slider spring has important application value.The main research contents of this paper are as follows:(1)The failure mechanism of a slider spring used for underwater acoustic interference bullet is analyzed,and the multivariate characteristic parameters that can characterize its own degradation state are determined.Based on the analysis results,an accelerated degradation test is designed to collect the performance degradation data of parameters.In addition,the basic theoretical knowledge of multivariate parameter degradation modeling such as degradation model,multivariate parameter degradation reliability modeling and acceleration model is introduced.In addition,the theoretical knowledge,specific classification and corresponding selection methods of Copula function are deeply studied,which lays a solid theoretical foundation for the study of multivariate parameter degradation modeling.(2)A reliability evaluation model based on multivariate degradation distribution is constructed.By calculating the Anderson-Darling statistical value of parameter degradation data in each given distribution family,the optimal distribution family is selected.The performance degradation trajectory is fitted and the performance degradation equation is determined.Combining with the selected optimal edge distribution family,the appropriate multivariate parameter reliability modeling method is selected,and the multivariate degradation distribution model is used to realize the reliability life evaluation of a certain underwater acoustic interference bullet slider spring(TYPE A0).Finally,the influence of single parameter,multivariate parameter completely independent and interrelated on the final life evaluation is analyzed.(3)A reliability evaluation model based on multivariate Wiener process is constructed.Considering the randomness shown in the actual degradation process of the product,the drift coefficient is treated as a random parameter,and the random effect Wiener process is established.Then,the multi-parameter performance reliability model is constructed by using Copula function,and all the parameters in the model are treated as functions of accelerating stress.The model parameters are solved by regression analysis and TSML method,and the validity of the model was verified by an example of crack propagation.Finally,the reliability life of a slider spring used for underwater acoustic interference bullet(TYPE A1)is predicted and analyzed by using the multivariate Wiener process model,and the reliability evaluation results under the conditions of single parameter,complete independence of multiple parameters and correlation of multiple parameters are analyzed.The analysis shows that the prediction result of reliability life considering the correlation of multiple parameters is more reasonable.