Establishment Method of Assurance Reliability Degradation Equation for Space Agency Products

Abstract

The invention provides a method for establishing a reliability degradation equation of a space agency product. The method includes: establishing a corresponding margin equation according to the key performance parameters of the product, and analyzing the failure mode and mechanism; judging whether the relationship between the output result of the failure physical model and the performance parameter is mutation type or continuous type, if it is mutation type, it is judged whether the fault physical model is a vibration fatigue fault physical model or a thermal fatigue fault physical model, and the vibration fatigue fault physical model establishes the first degradation equation, otherwise the second degradation equation is established; Continuous type, judge whether the fault physical model is a wear fault physical model or a thermal deformation fault physical model, and establish the third degradation equation for the wear fault physical model, otherwise, establish the fourth degradation equation; substitute the degradation equation back into the margin equation as the regular product reliability . The invention utilizes the sure reliability theory to study the product reliability of the space agency, and the proposed method can effectively solve the reliability evaluation of the product of the space agency and shorten the development cycle.

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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