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Mechanism reliability calculating method based on multi-factor coupling

A calculation method and reliability technology, which can be used in calculations, special data processing applications, instruments, etc., and can solve problems such as difficulty in considering deformation effects.

Active Publication Date: 2015-01-21
HUAQIAO UNIVERSITY
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Problems solved by technology

There is a big difference between the above processing method and the actual situation that the mechanism clearance impact affects the output of the mechanism
[0010] (3) Also due to the complexity of the mechanism reliability calculation itself, the mechanism modeling method adopted is simple, and it is difficult to consider the influence of deformation on the mechanism output

Method used

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  • Mechanism reliability calculating method based on multi-factor coupling
  • Mechanism reliability calculating method based on multi-factor coupling
  • Mechanism reliability calculating method based on multi-factor coupling

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Embodiment Construction

[0045] The present invention is a method for calculating the reliability of a mechanism under the coupling effect of multiple factors, wherein the formula for calculating the reliability of mechanism motion is expressed as follows:

[0046] p f = P [ g ( x ) 0 ] ≈ N 1 N 2 - - - ( 1 )

[0047] R=1-p f

[0048] Vector x = [x 1 ,x 2 ,...,x n ] in x 1 ,x 2 ,...,x n is various influencing factors, g(x)=△-ε(x) is the limit state function realized by the mechanism function, ε(x) is the output of the mechanism, △ is the limited value of the output of the mechanism, which is given by the design goal of the mechanism, N 2 For vector x=[x 1 ,x 2...

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Abstract

The invention discloses a mechanism reliability calculating method based on multi-factor coupling. The method comprises the steps of modeling a mechanism based on multi-rigid-body dynamics, a clearance collision model and a flexible body discretization method to obtain the output value of the mechanism so that multiple influence factors including rod piece size error, assembly error, clearance, friction, load, speed and deformation can be considered, then conducting parameterization on the multiple factors influencing mechanism output in a mechanism model, and finally conducting efficient and accurate mechanism reliability calculation based on the minimum sampling method. The mechanism reliability calculating method is more suitable for practical engineering application due to the fact that more factors are considered.

Description

technical field [0001] The invention relates to a method for calculating the reliability of a mechanism under the coupling effect of multiple factors, especially considering the effects of various factors such as rod size error, assembly error, gap, friction, load, speed, and deformation, which is more in line with the actual engineering situation. It is suitable for reliability evaluation of engineering mechanism design, reliability verification and other related fields. Background technique [0002] In the actual engineering mechanism design, there are errors between the realization of the actual function of the mechanism and the ideal design. This is because the mechanism is affected by random factors such as rod size manufacturing error, assembly error, gap, friction, load, speed, etc. At the same time, the mechanism is deformed under load. Based on the above effects, the motion output of the mechanism is uncertain, that is, the mechanism output has a probability distri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 赖雄鸣王成张勇缑锦言兰
Owner HUAQIAO UNIVERSITY
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