A Reliability Analysis Method of Mechanical Structure Based on Multi-Fault Mechanism Coupling

Abstract

The invention provides a reliability analysis method for a mechanical structure with multiple failure mechanism coupling effects, which can consider the simultaneous action and interaction of multiple failure mechanisms, and analyze the reliability, reliable life and sensitivity of the structure. The method mainly includes five steps: determine the main parameter of damage equivalent, use the same parameter to represent the effect of multiple fault mechanisms based on the principle of damage equivalent; construct the physical model of damage equivalent, according to the different contribution ratio of the fault mechanism, it can be Establish damage superposition model or correction coefficient model; parametric simulation, by adjusting parameters to control structural geometry, material properties, loads, etc., automatically realize the reconstruction of equivalent physical model of damage; randomness analysis of fault physical model, considering parameter randomness, With the help of the improved primary reliability method, etc., analyze the structural reliability, reliability sensitivity, reliable life, etc.; based on Bayesian model randomness correction, make full use of product development and use process data to correct the randomness results of the physical failure model, Improve analysis precision.

Description

technical field [0001] The invention provides a reliability analysis method for a mechanical structure with multi-fault mechanism coupling effects, and belongs to the fields of mechanical design and structural reliability design. Background technique [0002] The faults of mechanical structures are mostly wear-and-tear faults, and damage is a physical process used to describe the performance degradation of structures or materials under load and lead to damage. Many structural parts in engineering, such as some aircraft components, generally suffer from fatigue damage. Taking the engine turbine disk as an example, the engine works continuously for several hours after starting, then stops for several hours, and then starts again, which is a load cycle. However, the working environment of the vortex is high in temperature, accompanied by creep. Therefore, when studying their life, it is necessary to consider not only the destructive effect of fatigue, but also the coupling ef...

AI Technical Summary

Problems solved by technology

[0003] At present, a relatively large amount of research work has been carried out in the machinery industry on the reliability analysis of the single fault mechanism of the structure, and the reliability research on the multi-fault mechanism is still in its infancy.

Images