Structural reliability method based on dynamic weight response surface under mixed uncertainty

An uncertainty and dynamic weighting technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of not considering the weight of test samples, low algorithm accuracy and efficiency, and not applicable to random and interval mixed variables at the same time and other issues, to achieve the effects of easy programming, improved accuracy and efficiency, and high computational efficiency

Active Publication Date: 2018-11-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the existing dynamic quadratic response surface algorithm is usually only applicable to the system with random variables, but not to the system with both random and interval mixed variables; in addition, t

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  • Structural reliability method based on dynamic weight response surface under mixed uncertainty
  • Structural reliability method based on dynamic weight response surface under mixed uncertainty
  • Structural reliability method based on dynamic weight response surface under mixed uncertainty

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[0023] 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.

[0024] 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 method based on dynamic weight quadratic response surface under mixed uncertainty, comprises the following steps:

[0025] S1. Analyze the operating environment, system composition and historical data of the product according to the product manual, usage specifications, design standards, etc. According to expert experience, user data, maintenance records, etc., the key components and subsystems of the system are determined by the method of importance analysis. Use failure mode and effects analysis (Failure Mode and Effects Analysis, FMEA) to determine the failure mode and failure mechanism ...

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Abstract

The invention discloses a structural reliability method based on dynamic weight response surface under mixed uncertainty. The invention is applied to the field of reliability technical field, and aimsat structural reliability problems under mixed variables. The method comprises the following steps of determining a fitted sample of a current iterative response surface; fitting and getting the response surface of the current iteration by weighted least squares; getting the reliability design point of the current response surface according to the hybrid variable decoupling method; stopping the iteration, when the value of the random variable part of the reliability design point obtained by two adjacent iterations satisfies the convergence criterion; calculating the failure probability of thestructure by Monte Carlo simulation according to the response surface obtained from the last iteration. The invention constructs the response surface, so that the limit state function in the standardnormal space is explicitly approximated in the form of a quadratic response surface, which facilitates subsequent reliability analysis. And a double weighting mechanism is introduced to effectively improve the accuracy and computational efficiency of the response surface method.

Description

technical field [0001] The invention belongs to the field of reliability engineering, in particular to a structural reliability analysis technology based on a dynamic weight quadratic response surface under mixed uncertainties. Background technique [0002] With the development of the times, the complexity and reliability requirements of various engineering structures are constantly increasing. Engineering structures are inevitably disturbed by various uncertain factors (such as material properties, external loads, and geometric dimensions) during operation, which makes the response of key nodes of the structure uncertain. In traditional engineering design, the safety factor is used to ensure the relative stability of the designed structure, and the ratio of the expected strength response of the structure to the expected load is usually used as the safety factor value. Obviously, the traditional method does not consider the uncertainty of each influencing factor. At the sa...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/08
Inventor 肖宁聪章陈锋尚昆袁凯
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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