Multivariate generalized Wiener process performance degradation reliability analysis method

Abstract

The invention provides a multivariate generalized Wiener process performance degradation reliability analysis method, which comprises the following steps of S1, collecting product environmental stress data and performance degradation test data, and establishing a multivariate generalized Wiener process performance degradation analysis model; S2, estimating unknown parameters in the degradation analysis model, including defining a likelihood function of the unknown parameters in the degradation analysis model and performing optimal estimation on the unknown parameters; and S3, performing reliability analysis on the performance degradation of the product under any working condition based on the multivariate generalized Wiener process performance degradation analysis model. The method solves the problems that most traditional performance degradation analysis methods do not consider environmental stress variables or only consider a single stress variable, and sometimes, a traditional Wiener process cannot describe the performance degradation process of a nonlinear product, so that the evaluation precision is low, the method better conforms to the engineering practical situation, and the evaluation precision can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of reliability analysis of performance degradation, and in particular relates to a multivariate generalized Wiener process performance degradation reliability analysis method. Background technique [0002] Performance degradation analysis plays an important role in product reliability assessment and maintenance plan formulation, especially for high-reliability and long-life products. Most of the current studies only focus on the performance degradation process of the product itself, without considering the environmental stress variables. Sometimes even if the environmental stress is considered in the accelerated performance degradation analysis, most of them only consider single stress. However, for many modern products, due to their complex internal structure and degradation failure mechanism, the performance degradation process is often affected and affected by internal and external factors (such as temper...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a multivariate generalized Wiener process performance degradation reliability analysis method, which solves the problem that most traditional performance degradation analysis methods do not consider environmental stress variables or only Considering a single stress variable, and the traditional Wiener process sometimes cannot describe the nonlinear product performance degradation process, resulting in low evaluation accuracy and other issues

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