Establishment method for definite reliability degradation equation of aerospace mechanism product

Abstract

The invention provides an establishment method for a definite reliability degradation equation of an aerospace mechanism product. The method comprises the steps of building a corresponding margin equation according to key performance parameters of the product, and analyzing a fault mode and mechanism; judging whether the relationship between the output result of a fault physical model and the performance parameters is an abrupt change type or a continuous type, if the relationship is the abrupt change type, judging whether the fault physical model is a vibration fatigue fault physical model or a thermal fatigue fault physical model, if the fault physical model is a vibration fatigue fault physical model, establishing a first degradation equation, and otherwise, establishing a second degradation equation; if the fault physical model is a continuous type, judging whether the fault physical model is a wear fault physical model or a thermal deformation fault physical model, if the fault physical model is a wear fault physical model, establishing a third degradation equation, and otherwise, establishing a fourth degradation equation; and substituting the degradation equation into the margin equation, if the result is positive, indicating that the product is reliable. According to the invention, the reliability of the aerospace mechanism product is researched by using a definite reliability theory, the reliability evaluation of the aerospace mechanism product can be effectively solved, and the development period is shortened.

Description

technical field [0001] The invention belongs to the technical field of reliability, in particular to a method for establishing a reliability degradation equation of an aerospace agency product. Background technique [0002] With the rapid development of the aerospace industry, higher and higher requirements are placed on the reliability and life of the space agency. The importance of the life prediction and reliability assessment of the space agency is becoming increasingly prominent. Once the space agency fails, the entire mission will face failure. , and even lead to more serious consequences, so the reliability research of aerospace agency products has attracted much attention. However, due to technical reasons, it is difficult for the ground test to fully simulate the space environment, resulting in the difficulty of obtaining or discrepancies between many parameters and test data. It is even more difficult to collect data in the actual space environment, which makes the...

AI Technical Summary

Problems solved by technology

However, the existing methods cannot meet the reliability research of space agency products, and the failure physics method does not consider the uncertainty of parameters; the probabilistic failure physics method needs to know the parameter distribution of the failure mechanism model, and the space-oriented drive mechanism When the available statistical information is less, the distribution of the required parameters cannot be effectively obtained; the margin and uncertainty quantification theory lacks the support of mathematical theory

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