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Mechanism reliability modeling method

A technology of reliability and analysis methods, applied in random CAD, computer-aided design, special data processing applications, etc.

Active Publication Date: 2018-09-28
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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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. The method is implemented mainly through the four steps that first, random process fitting is performed on sample data to obtain a degradation model; second, time-varying correlation analysis is performed on degradation characteristic quantities, a D-VineCopula function is used to perform multi-element correlation modeling, and time-varying correlation is described by use of a Kendall coefficient time-varying model; third, sampling is performed on correlation characteristic quantities; and fourth, a limit state equation of a failure mode is established, all samples are substituted into a performance function for analysis, and reliability is obtained through calculation. Based on the proposed multi-element time-varying correlation degradation modeling method, the defect that through an existing modeling method, a mechanism reliability result error is large because multiple characteristic quantities are assumed independently is overcome. Meanwhile, through the method, the correlativity among multiple degradation characteristic quantities can be flexibly constructed, time-varying modeling can be performed on the correlativity, and the obtained reliability assessment 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 Applications(China)
IPC IPC(8): G06F17/50
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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