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Mechanism reliability modeling method comprising degradation model

一种退化模型、可靠性的技术，应用在随机CAD、计算机辅助设计、设计优化/仿真等方向，达到可靠性评估结果准确的效果

Active Publication Date: 2021-11-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned technical solutions in the prior art are based on the fact that the correlation between variables does not change with time. With the deepening of the correlation research, the correlation between variables is not constant, but changes dynamically with time. of

Method used

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  • Mechanism reliability modeling method comprising degradation model
  • Mechanism reliability modeling method comprising degradation model
  • Mechanism reliability modeling method comprising degradation model

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Embodiment Construction

[0052] The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0053] Taking an aircraft cabin door lock test mechanism as an example, image 3 It is a schematic plan view of the upper lock test mechanism of the cabin door. The movement of the displacement slider 9 is used to simulate the movement of the lock hook, and the servo motor and slider crank mechanism are used to drive the slider 4 to move vertically on the guide rail. It is transmitted to the displacement slider 9 through the connecting rod assembly, so that it can move horizontally along the guide rail. The connecting rod assembly is a set of planar connecting rod mechanism, which is used to transmit the driving force on the driving slider 4 to the displacement slider 9, and ensure the coordination of the motion relationship between the two sliders. The external load acting on the displacement slider 9 is simulated by an externally loaded spring 10 .

[0054] Step 1: Ext...

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Abstract

The invention relates to a mechanism reliability modeling method comprising a degradation model. The mechanism reliability modeling method mainly comprises the following four steps: step 1, fitting sample data by using a random process to obtain the degradation model; step 2, performing time-varying correlation analysis on degradation characteristic quantities, performing multivariate correlation modeling by using a D-VineCopula function, and describing time-varying correlation by using a Kendall coefficient time-varying model; step 3, sampling related characteristic quantities; and step 4, establishing a limit state equation of a failure mode, substituting all samples into a performance function for analysis, and calculating to obtain reliability. Based on the multivariate time-varying correlation degradation modeling method provided by the invention, the defect of large mechanism reliability result errors caused by independent assumption of multiple characteristic quantities in an existing modeling method is overcome; and meanwhile, correlations among a plurality of degradation characteristic quantities can be flexibly constructed, time-varying modeling is carried out on the correlations, and an obtained reliability evaluation result is more accurate.

Description

[0001] This application is a divisional application with the application number 201810109561.3, the application date is February 5, 2018, and the title of the invention is "a mechanism reliability modeling method". technical field [0002] The invention relates to the field of mechanical product reliability design and analysis, in particular to a mechanism reliability modeling method including a degradation model in mechanism function reliability design. Background technique [0003] With the continuous development of precision mechanical engineering and aerospace engineering, mechanical mechanism systems are moving towards the goals of high precision, high efficiency, high reliability and long life. The mechanism is an important part of the mechanical system. The components in the mechanism are connected to each other through hinges, and jointly transmit motion and load to realize the function of the mechanism. Therefore, the functional reliability of the mechanism has becom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F30/17G06F30/15G06F111/08G06F119/04G06F119/02
CPCG06F2111/08G06F30/15G06F30/17G06F2119/04G06F30/20G06F2119/02
Inventor 张玉刚申林杰宋笔锋喻天翔
Owner NORTHWESTERN POLYTECHNICAL UNIV
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