Reliability Analysis Method of Step Stress Acceleration Performance Degradation Considering Measurement Error

Abstract

The present invention proposes a step stress accelerated performance degradation reliability analysis method considering measurement error, the steps are as follows: through the accelerated performance degradation test, the accelerated performance degradation test data of each sample step stress is collected, and the accelerated performance degradation test data is pre-processed. Processing; describe the performance degradation process of the product based on the generalized Wiener process, determine the accelerated degradation model, and establish a step stress accelerated performance degradation model considering measurement errors; use the likelihood function to estimate the unknown parameters in the step stress accelerated performance degradation model; Carry out reliability assessment and life prediction for products. The present invention introduces the measurement error into the analysis of step stress acceleration performance degradation data for the first time, and considers the different time-varying characteristics of the mean value item and the variance item, which is more in line with the actual engineering situation; by fully developing and utilizing the longitudinal information between the degradation data under different stress levels And the lateral information between different samples effectively increases the amount of information and improves the accuracy of reliability evaluation.

Description

technical field [0001] The invention relates to the technical field of reliability analysis of accelerated performance degradation tests, in particular to a step stress accelerated performance degradation reliability analysis method considering measurement errors. Background technique [0002] Due to the limitation of test cost and development period, compared with the traditional reliability analysis method based on failure time, the reliability analysis method based on performance degradation data has higher efficiency. However, for some high-reliability and long-life products, often only a small amount of performance degradation data can be obtained within a limited test time, resulting in low evaluation accuracy. In order to solve the above problems, the reliability analysis method based on the step stress accelerated performance degradation test is an effective way. [0003] In the accelerated performance degradation analysis, most of the existing methods assume that t...

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Problems solved by technology

[0005] For ignoring the measurement error of the performance degradation data in the measurement process, it will be impossible to accurately grasp and describe the random influencing factors and time-varying characteristics of the product degradation process, which will affect the technical problem of evaluation accuracy. This invention proposes a step stress acceleration performance considering measurement error The degradation reliability analysis method effectively increases the amount of information and improves the accuracy of reliability evaluation, which is more effective and more in line with the actual situation of the project

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