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A Mechanism Reliability Modeling Method

A technology of reliability and analysis method, applied in random CAD, computer-aided design, geometric CAD, etc., to achieve the effect of accurate reliability evaluation results

Active Publication Date: 2021-10-15
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the technical solutions of the above-mentioned 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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  • A Mechanism Reliability Modeling Method
  • A Mechanism Reliability Modeling Method
  • A Mechanism Reliability Modeling Method

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Embodiment Construction

[0051] The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0052] 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 .

[0053] Step 1: Ext...

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Abstract

The invention relates to a mechanism reliability modeling method, which is mainly realized through four steps: the first step is to obtain a degradation model by using random process fitting on sample data; the second step is to perform time-varying correlation analysis on the degradation feature quantity , using the D‑VineCopula function for multivariate correlation modeling, the time-varying correlation is described by the Kendall coefficient time-varying model; the third step is to sample the relevant characteristic quantities; the fourth step is to establish the limit state equation of the failure mode, and all samples Bring in the function function for analysis, and calculate the reliability. Based on the proposed multivariate time-varying correlation degeneration modeling method, the present invention solves the defect that the existing modeling method has relatively large errors in mechanism reliability results due to independent assumptions of multiple feature quantities. At the same time, the present invention can flexibly construct the correlation relationship between multiple degraded feature quantities, and perform time-varying modeling on the correlation relationship, so that the obtained reliability evaluation result is more accurate.

Description

technical field [0001] The invention relates to the field of mechanical product reliability design and analysis, in particular to a mechanism reliability modeling method in mechanism function reliability design. Background technique [0002] 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 become the focus of research. With the operation of the mechanism, the degradation and damage of the mechanism become one of the main factors affecting the performance of the mechanism, such as the wear and tear of the kinematic pair in the mechanism....

Claims

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Application Information

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