Reliability modeling method for aircraft cabin lock system considering degradation of sudden failure threshold

Abstract

The invention belongs to the technical field of reliability modeling, in particular to a failure analysis and reliability modeling method considering a continuous degradation of a sudden failure threshold along with time. The method comprises modeling of an external load impact is conducted, modeling of a sudden failure mode is conducted, modeling of a degenerate failure mode is conducted, and thereliability model of an aircraft cabin door lock system is established according to the models established by the sudden failure mode and the degradation failure mode respectively, finally, the results of reliability data are calculated. The method not only considers the two associated failure modes of the sudden failure and the degradation failure, and failure mechanism and competition mode of the two failure modes, but also improves a traditional method shortcoming of without considering the sudden failure threshold also degenerates with time, and the method improves the accuracy of the reliability modeling.

Description

technical field [0001] The invention belongs to the technical field of reliability modeling, and in particular relates to a failure analysis and reliability modeling method under the condition that a burst failure threshold continuously degrades with time. Background technique [0002] The working environment of mechanical systems is generally more complex, including complex loads, complex failure modes, and complex failure mechanisms. The failure forms of mechanical systems can be summarized into two types, one is sudden failure (hard failure), usually due to The external load exceeds the allowable threshold of the mechanical system load at a certain moment; the other type is degraded failure (soft failure), which is caused by the performance degradation of the structure or components of the mechanical system as the working time prolongs, resulting in mechanical failure. The system cannot complete the established functions or performance indicators. During the working proc...

AI Technical Summary

Problems solved by technology

[0005] However, in the prior art modeling methods for competing failure modes of aircraft cabin door lock systems, the threshold of sudden failure is usually considered as a constant value, and the sudden failure threshold of multi-mode competing failure mechanical systems is ignored. The characteristic of continuous degradation with the continuation of working time makes it impossible to carry out accurate reliability analysis and modeling

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