Degradation modeling and life prediction method considering effective impact

Abstract

The invention provides a degradation modeling and life prediction method considering an effective impact. Firstly, test data are collected, and then a performance index degradation model is built; anenvironmental change rate threshold of a product subjected to the effective impact of an environment load is determined according to the test data, and unknown parameters in the model are estimated; and finally, the time of occurrence of the effective impact is determined and then life and reliability prediction is performed. The method comprises the following specific steps: step 1, collecting the test data; step 2, building the degradation model; step 3, determining the environmental change rate threshold; step 4, estimating parameters to be estimated; step 5, predicting the time of occurrence of the effective impact; and step 6, performing reliability prediction and verification. According to the method provided by the invention, the influence of changes of environment and load on product performance degradation is considered, namely, the performance degradation rate and the effective impact on a degradation index are considered at the same time, so that the prediction method can better meet the actual requirements and the prediction accuracy is improved.

Description

Technical field: [0001] The invention relates to a degradation modeling and life prediction method considering effective impact, and belongs to the technical field of degradation modeling and life prediction. Background technique: [0002] With the development of science and technology, the reliability requirements of products are getting higher and higher, especially in military fields such as aerospace, electronic ships, etc., the life and reliability of key components of weapons and equipment are very important. In view of the characteristics of long life and high reliability of military products, the method of performance degradation modeling is usually used to predict the life of products. Traditional degradation modeling methods are mainly carried out for static conditions. However, in the actual use of the product, the environment and load of the product may change with time, so the accuracy of the life prediction of the product using the traditional method is not hi...

AI Technical Summary

Problems solved by technology

[0019] At present, in the degradation model that considers the impact of the time-varying environment on the degradation rate of product performance and the impact of degradation indicators, due to insufficient consideration of the impact damage type in the time-varying environment, that is, the effective impact on the product caused by the rapid change of environmental stress is ignored. As a result, the existing methods cannot solve practical engineering problems well

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