PCE (polynomial chaos expanse) based global sensitivity analysis method for time-variation reliability

A chaotic polynomial, sensitivity analysis technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as not reflecting the real situation of the product, not involving the product degradation process, etc.

Active Publication Date: 2016-04-20
BEIHANG UNIV
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Problems solved by technology

However, the object of these studies does not involve the degradation process of the product, and cannot reflect the real situation of the product throughout its life cycle

Method used

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  • PCE (polynomial chaos expanse) based global sensitivity analysis method for time-variation reliability
  • PCE (polynomial chaos expanse) based global sensitivity analysis method for time-variation reliability
  • PCE (polynomial chaos expanse) based global sensitivity analysis method for time-variation reliability

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Embodiment Construction

[0110] See Figure 1-5, the present invention will be further described in detail below in conjunction with a certain linkage device. The retractable device includes a sliding rod, a rear main push arm, a rear support arm, a hinge, a front main push arm, a front support arm, a hydraulic device and a load, as shown in Table 3 below, and the main design variable data are shown in Table 3. The fault criterion is that the maximum frictional resistance Max-Force does not exceed the maximum output force of the hydraulic device. The research objective is to analyze the sensitivity of the time-varying reliability of the connecting rod device to the mean value of the design variables during 2000 times of retracting and retracting.

[0111] Table 3 Parameter values ​​of main design variables

[0112] the symbol

the meaning

nominal value

the symbol

the meaning

nominal value

X A

The abscissa of point A

-910.49mm

G d

load weight

260...

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Abstract

The invention provides a PCE (polynomial chaos expanse) based global sensitivity analysis method for time-variation reliability. The method comprises steps as follows: step one, performance PCE at each discrete moment of a product degradation process is calculated on the basis of a failure mechanism reliability and performance integrated module; step two, reliability PCE at each discrete moment of the product degradation process is calculated on the basis of an orthogonal experimental design scheme; step three, time-variation reliability PCE of the product degradation process is calculated according to the principle of moving least square; step four, coefficients of the time-variation reliability PCE are decomposed and recombined according to Sobol', and a global sensitivity Sobol' index is calculated. The method can be used for efficiently solving the problem about global sensitivity analysis for the reliability of a complex engineering model in a degradation process and has the characteristics of higher precision, wide application range and the like.

Description

(1) Technical field: [0001] The invention provides a reliability global sensitivity analysis method based on chaotic polynomial expansion, focuses on solving the problem of reliable global sensitivity analysis of complex engineering models, and belongs to the cross technical field of system optimization design and reliability design. (two) background technology: [0002] System reliability and performance integration technology is a new technology that considers faults and environmental disturbances in the product design process, and uses methods such as reliability optimization and uncertainty analysis to achieve comprehensive design analysis of reliability and performance. Due to the development of the product unit degradation mechanism on the time axis and its propagation among different units, the performance output of the product increases with time as a random process of gradual degradation, and the time-varying reliability can reflect the reliability and quality of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 赵健宇曾声奎郭健彬杜绍华王尧
Owner BEIHANG UNIV
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