A Calculation Method of Multi-failure Mode Correlation Reliability of Mechanical Parts

A failure mode and mechanical parts technology, applied in random CAD, design optimization/simulation, geometric CAD, etc., can solve problems such as calculation accuracy and efficiency that cannot meet engineering needs

Active Publication Date: 2021-01-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the reliability evaluation of mechanical structures with multiple failure mode correlations and complex uncertain inputs has yet to be resolved.
[0004] When the random input parameters of mechanical parts are multimodal distribution or more complex distribution, the calculation accuracy and efficiency of traditional reliability methods can no longer meet the engineering needs

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  • A Calculation Method of Multi-failure Mode Correlation Reliability of Mechanical Parts
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  • A Calculation Method of Multi-failure Mode Correlation Reliability of Mechanical Parts

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[0043] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.

[0044] Such as figure 1 Shown is the solution flow chart of the present invention, the technical solution of the present invention is: a method for calculating reliability related to multiple failure modes of mechanical parts, including:

[0045] S1. Analyze the main failure modes of mechanical parts, and determine the corresponding failure physical model according to the main failure modes.

[0046] In this embodiment, a certain machine transmission shaft under the action of torque is taken as the research object. According to its main functions and working conditions, the transmission shaft generally has three main failure modes: static strength failure, stiffness failure and fatigue failure.

[0047] The physical model of failure can be deter...

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Abstract

The invention discloses a multi-failure mode correlation reliability calculation method of mechanical parts, which is applied to the technical field of reliability analysis of mechanical products. The present invention considers the correlation between failure modes, uses the Vine Copula function to characterize the correlation between failure modes, and establishes a multi-dimensional joint probability density function of multiple failure modes; considering that the multi-dimensional joint probability density function is difficult to integrate, According to the obtained multi-dimensional joint probability density function of multiple failure modes considering correlation, each failure mode is transformed into independent random responses; and the failure probability of multiple failure modes is calculated based on the simulation method and saddle point approximation. Compared with the failure probability method for calculating multiple failure modes, the correlation between multiple failure modes is quantified, which is closer to the actual engineering situation.

Description

technical field [0001] The invention belongs to the technical field of reliability analysis of mechanical products, and in particular relates to a reliability evaluation technology under multi-failure mode correlation and complex uncertainty input of mechanical parts. Background technique [0002] Various failure modes may occur in mechanical structures under complex service environments, among which static strength failure, stiffness failure and fatigue failure are the main failure modes. However, in order to simplify the complexity of the design in the actual engineering design process, the reliability issues corresponding to the strength failure and stiffness failure of the mechanical structure under the action of static load and the fatigue failure under the action of dynamic load are considered separately. However, for most mechanical structures, these failure modes are not independent, but have a strong correlation, which is mainly reflected in: (1) The same external l...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F30/17G06F111/08
CPCG06F30/17G06F30/23G06F2111/08
Inventor 张小玲韩旺黄协思凌丹
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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