Study On Storage Reliability Analysis Method Of Elastic Electromagnetic Relay Based On Stress Relaxation

Under the theme of the era of peace and development,most missile weapons and equipment are in storage,and their storage requirements are constantly increasing.As a key component of missile weapon equipment system,missile electromagnetic relay also has high storage reliability requirements.However,there are few studies on the storage reliability of electromagnetic relays for missiles at home and abroad.The existing studies have the following problems: the relevant test parameters are not comprehensive,the reasons for the changes in performance data are not clear,the failure mechanism of stress relaxation is incomplete,and the characterization parameters are not clear.,Data modeling methods need to be optimized,and evaluation and forecasting methods cannot keep up with development.Therefore,the research on the storage reliability analysis method of the bomb electromagnetic relay has become an urgent problem to be solved.First,in order to achieve high-precision and fully automatic collection of storage degradation performance data of electromagnetic relays for missiles,the accelerated storage test method of relay storage reliability is studied,and the corresponding parameter test system is optimized.The optimized part is designed from both the hardware and software aspects,and the voltage parameter test module is added,and its detection accuracy reaches0.05 V.Use the optimized system to carry out accelerated tests and obtain reliable degradation data.The trend analysis of the obtained data is carried out with a line graph,and the change law of various performance parameters with time under different temperature stresses is obtained.On this basis,the coil resistance,contact resistance,operating voltage,release voltage and release time are determined as sensitive parameters of storage degradation.For sensitive parameters,the moving average method is used to reduce noise,which provides a data basis for the study of storage reliability of electromagnetic relays for missiles.Secondly,in view of the unclear stress relaxation mechanism,unclear reasons for performance data changes,and unclear stress relaxation characterization parameters,starting from the structural function and action characteristics of the elastic electromagnetic relay,combined with the failure modes and reeds appearing in the accelerated storage test The surface micromorphology analyzes the failure mechanism of the stress relaxation of the electromagnetic relay.After analysis,the reason for the decrease of the voltage parameter of the relay and the increase of the release time is due to the stress relaxation at the deformation of the relay spring.Therefore,single parameter action voltage,multi-parameter principal component analysis and stress relaxation rate are used to characterize the stress relaxation degradation.Then,in order to solve the problem that the stress relaxation of the relay reed cannot be measured on-line without loss,combining the stress relaxation mechanism of the relay,the stress relaxation theory of metal materials and the Larson-Miller empirical formula,a single parameter action voltage based on the failure physics to reduce the restoring reaction force is established.Model and multi-parameter principal component regression model.The model is evaluated using the method with the smallest sum of squares of error.Finally,in view of the high reliability of the relay,small samples,few data,and difficulty in estimating the reliability,the life is selected as the index to evaluate the storage reliability of the electromagnetic relay for missiles,and the storage life prediction method of the SVM electromagnetic relay for missiles based on the Bagging framework is proposed,Bagging The framework is suitable for small samples,which can effectively reduce errors and avoid model overfitting.SVM can improve generalization ability.This method is used to predict the operating voltage of the missile electromagnetic relay,and the life prediction result is obtained.The average absolute error is used to evaluate the model to verify the effectiveness and accuracy of the prediction method.The measures to improve the storage reliability of relays were proposed from three aspects: mechanical parameters,structural design and contact materials,and tested and verified.This research provides the necessary research foundation and research methods on the storage reliability research of missile electromagnetic relays.Its key technologies and methods can be extended to the storage reliability research of general electromagnetic relays or other electrical components.