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Structural reliability analysis method based on second order saddle point approximation under hybrid uncertainty

An analysis method and reliability technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as mixed uncertainties that cannot be solved, and achieve the effect of expanding the scope of application and improving computing efficiency

Active Publication Date: 2018-11-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the existing reliability analysis methods based on saddle point approximation can basically only deal with random uncertainties, but cannot solve mixed uncertainties.

Method used

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  • Structural reliability analysis method based on second order saddle point approximation under hybrid uncertainty
  • Structural reliability analysis method based on second order saddle point approximation under hybrid uncertainty
  • Structural reliability analysis method based on second order saddle point approximation under hybrid uncertainty

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Embodiment Construction

[0025] 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.

[0026] Such as figure 1 Shown is the scheme flow chart of the present invention, the technical scheme of the present invention is: the structural reliability analysis method based on second-order saddle point approximation under mixed uncertainty, including:

[0027] S1. Analyze the operating environment of the product, the composition of the system and the system according to the product manual, usage specifications, design standards, etc. Based on historical data, expert experience, user data, maintenance records, etc., use the importance analysis method to determine the key components of the system and subsystems. Use failure mode and effects analysis (Failure Mode and Effects Analysis, FMEA) to determine the failure mode and failure mechanis...

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Abstract

The invention discloses a structural reliability analysis method based on second order saddle point approximation under hybrid uncertainty. By performing univariate approximation for a limit state equation at a mean point of a random variable and a central point of an interval variable, determining a minimum value and a maximum value of the equation subjected to approximation on the interval variable, determining a cumulant generating function of the minimum value and the maximum value of the limit state equation on the interval variable, and respectively calculating a saddle point value, thus, reliability of a system can be calculated. Compared with the existing reliability method, the method provided by the invention has no need of searching a limit state equation reliability design checking point, improves calculation efficiency, can be applied to structural reliability analysis under hybrid uncertainty and has better universality.

Description

technical field [0001] The invention belongs to the field of reliability engineering, in particular to a structural reliability analysis technology under mixed uncertainties. Background technique [0002] With the rapid development of science and technology, the structure of many important equipment and products (such as: aircraft, high-speed rail, automobiles, CNC machine tools, etc.) is becoming more and more complex, and its analysis and design involve many disciplines. Because these products play an important role in the operation process, and are expensive to manufacture and work in a bad environment, if they break down during operation, it will cause huge economic losses, casualties and serious social impact. Studies have shown that the fluctuation and uncertainty of equipment and products in the process of analysis, design and operation are one of the key reasons leading to product failure and failure. Structural reliability analysis method is widely used in engineer...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 肖宁聪袁凯尚昆
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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