Reliability evaluation method considering influence of multi-stress coupling effect on product degradation

Abstract

The invention discloses a reliability evaluation method considering influence of a multi-stress coupling effect on product degradation. The method comprises the following steps: 1, establishing a performance parameter degradation model considering product degradation rate-degradation fluctuation correlation; 2, establishing a quantitative influence relationship of a multi-stress coupling effect on a product degradation rate; 3, establishing an accelerated degradation model considering the combined influence of the multi-stress coupling effect on the product degradation rate-degradation fluctuation; 4, deducing a failure distribution function and a reliability function of the product under the multi-stress coupling effect; 5, realizing self-adaptive identification and unknown parameter estimation of the coupling function by using maximum likelihood estimation; and 6, substituting the optimal coupling function obtained by optimization and the unknown parameter estimation value into the failure distribution function and the reliability function to realize reliability evaluation of the product under the multi-stress coupling effect. According to the method, the problem that the multi-stress coupling effect and the influence of the multi-stress coupling effect on the degradation process cannot be accurately and quantitatively described in the product reliability evaluation process is solved.

Description

technical field [0001] The invention belongs to the technical field of product performance degradation and reliability analysis, and relates to a product reliability evaluation method, in particular to a reliability evaluation method considering the influence of multi-stress coupling on product degradation. Background technique [0002] Reliability evaluation of a product refers to analyzing the probability that it can complete the specified function within the specified time through tests and other means. Under the premise of ensuring that the product failure mechanism remains unchanged, the accelerated degradation test can obtain rich product performance parameter degradation data by increasing the test stress and shortening the test period. Accurate accelerated degradation modeling through these degradation data is the core of product reliability assessment. In engineering practice, most products serve under the combined action of multiple stresses, such as temperature, ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing product reliability evaluation method has not considered the multi-stress coupling effect and its joint influence on the product degradation rate-degradation fluctuation, which leads to inaccurate reliability evaluation results, the present invention provides a multi-stress Reliability Evaluation Method of Coupling Effect on Product Degradation

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