Numerical control machine tool system component reliability evaluation method based on cascading fault analysis

A technology of numerical control machine tools and fault analysis, which is applied in general control systems, control/regulation systems, program control, etc., and can solve problems such as deviations in evaluation results

Inactive Publication Date: 2016-01-27
JILIN UNIV
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  • Application Information

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Problems solved by technology

[0007] Aiming at the defect that the existing technology replaces the inherent reliability with the comprehensive reliability of com

Method used

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  • Numerical control machine tool system component reliability evaluation method based on cascading fault analysis
  • Numerical control machine tool system component reliability evaluation method based on cascading fault analysis
  • Numerical control machine tool system component reliability evaluation method based on cascading fault analysis

Examples

Experimental program
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Embodiment

[0102] Intrinsic Reliability Evaluation of Machining Center System Components

[0103] According to the statistical analysis of the field failure data of 109 VDL-1000 type machining centers collected, the frequency distribution of failures in each failure part (subsystem) of the machining center is calculated, as shown in Table 1.

[0104] Table 1 Frequency list of fault location factors

[0105]

[0106]

[0107] According to the associated fault analysis of the machining center and the directed graph theory, the fault transfer relation model and the fault transfer directed graph are constructed respectively as follows image 3 shown.

[0108] The fault transfer directed graph is matrixed, and the adjacency matrix C of the machining center and the corresponding probability transition matrix are constructed according to the serial numbers of the subsystems of the machining center in the table:

[0109] C = ...

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Abstract

The invention relates to a numerical control machine tool system component reliability evaluation method based on cascading fault analysis. The method comprises the following steps that the entire numerical control machine tool system components are divided into multiple subsystems, and a fault transfer directed graph model is established according to the fault transfer relation between all the subsystems; the fault transfer directed graph model is described by using an adjacency matrix; a fault-correlation-based influence degree CK value of each subsystem is calculated; an inherent fault probability function of each subsystem is obtained according to the fault-correlation-based influence degree CK value of each subsystem and a comprehensive fault probability function through calculation; and reliability evaluation is performed on the numerical control machine tool system components by utilizing the inherent fault probability function. The cumulative fault process of the elements of the subsystems is considered by a reliability model, and fault correlation influence degree factors of other subsystem are also integrated so that the reliability model meets the reality further in comparison with the reliability model based on mutually independent assumption between systems.

Description

technical field [0001] The invention belongs to the technical field of reliability evaluation of numerical control machine tools, and relates to a method for evaluating reliability of numerical control machine tool system components based on cascade failure analysis. Background technique [0002] CNC machine tool is a complex system integrating machine, electricity, fluid, gas, and light. "Correlation" is a common feature of its faults, and the faults between parts and subsystems are transitive, which belongs to cascading faults. Reliability modeling and evaluation are the basis of research on reliability design, allocation and prediction. The reliability modeling of traditional CNC machine tool system components is mostly based on component failure information during machine tool operation, and based on the assumption of independent failure. Based on this, there is a deviation in the evaluation of component reliability levels, which has a great impact on component importan...

Claims

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Application Information

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IPC IPC(8): G05B19/406
CPCG05B19/406
Inventor 张英芝龙哲申桂香吴茂坤刘津彤秦猛猛
Owner JILIN UNIV
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