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Mechanism movement accuracy reliability analysis method based on fuzzy out-crossing model

A technology of mechanism movement and analysis method, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as fuzzy and time-varying reliability of mechanisms

Inactive Publication Date: 2014-08-27
BEIHANG UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for analyzing the reliability of mechanism motion precision based on the fuzzy threshold crossing model, which solves the problem of fuzzy time-varying reliability of the mechanism
In order to take into account the influence of the errors and tolerances in the mechanism motion on the reliability of the mechanism, consider the ambiguity and time-varying nature of the mechanism motion, and improve the problem of calculating the failure probability when the classic mechanism motion reliability theory considers both time-varying and ambiguity

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  • Mechanism movement accuracy reliability analysis method based on fuzzy out-crossing model
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Embodiment Construction

[0046] See Figure 1-Figure 5 , the present invention is based on a fuzzy threshold crossing model mechanism motion accuracy reliability analysis method, the specific steps of the method are:

[0047] Step 1: According to the characteristics of the task, establish a generalized fuzzy random stress-strength interference model

[0048] Different from structural reliability, fatigue, wear and motion error are the main failure mechanisms of the mechanism, and the analysis of mechanism reliability is mainly the analysis of mechanism motion reliability, that is, the analysis of motion error

[0049]

[0050] In the formula, is the actual motion output, is the ideal motion output, X is a random variable, and τ is time or active component motion parameters.

[0051] In actual working conditions, the movement error of the mechanism is mainly due to: first, there is an error in the mechanism synthesis method itself; time-varying and state ambiguity, and therefore, the motion er...

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Abstract

The invention discloses a mechanism movement accuracy reliability analysis method based on a fuzzy out-crossing model. The mechanism movement accuracy reliability analysis method includes the steps of (1) building a generalized fuzzy random stress-strength interference model (please see the specifications for the model) according to task characteristics, (2) determining a subordinating degree function mu(x) of movement errors, (3) determining the reliability R(tau0) at the moment tau0, and calculating the complete up-crossing rate v+(tau) and the complete down-crossing rate v-(tau), and (4) calculating the fuzzy time-variation reliability R in the mechanism task executing process. By means of the mechanism movement accuracy reliability analysis method, influences of the errors and tolerances of mechanism movement on the mechanism accuracy reliability are considered, a time-variation reliability calculation method-PHI2 and a state fuzzy analysis method are combined, and the mechanism fuzzy time-variation reliability problem can be effectively solved; the aim that in a classical mechanism movement reliability theory, when the time-variation performance and the fuzzy performance are considered at the same time, the failure probability is calculated by properly changing the out-crossing model is achieved.

Description

technical field [0001] The invention relates to a reliability analysis method of mechanism motion precision based on a fuzzy threshold crossing model, in particular to a time-varying reliability threshold crossing model of mechanism motion precision based on generalized random degeneration and fuzzy criteria, belonging to the field of mechanism reliability calculation. Background technique [0002] With the continuous development of military technology, aerospace technology and precision machinery, the mechanism system in machinery is gradually developing in the direction of high speed, light weight, high precision, high reliability, and automation. The reliability of the movement accuracy reliability of the mechanism is an important quality standard. increasingly prominent. Whether the movement precision of the mechanism is reliable or not is directly related to the safety and reliability of the entire mechanical equipment. The reliability of mechanism movement accuracy re...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 张建国闫军伟王丕东高振邦
Owner BEIHANG UNIV
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