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Method for analyzing influence degree on reliability of numerically-controlled machine tool subsystem

A technology of numerical control machine tools and analysis methods, applied in the field of numerical control machine tools, can solve problems such as failure to consider time correlation in subsystem reliability modeling

Inactive Publication Date: 2014-03-12
JILIN UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problem that time correlation is not considered in the reliability modeling of subsystems existing in the prior art, and to provide a method that simultaneously considers the failure time disturbance and test censoring time of other subsystems of CNC machine tools Analysis Method of Reliability Influence Degree of NC Machine Tool Subsystem

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  • Method for analyzing influence degree on reliability of numerically-controlled machine tool subsystem
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  • Method for analyzing influence degree on reliability of numerically-controlled machine tool subsystem

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Embodiment

[0114] The primary task of the influence degree analysis of CNC machine tool subsystems based on time correlation is to find out the dynamic impact of subsystem failures on the overall failure of the system. This impact is constantly changing with time and is not independent. The first premise of determining the degree of influence is to establish a life distribution model that truly reflects the failure process of each subsystem and the censored time of the correlation relationship in time when the system fails. In order to determine the censored time of the time-dependent relationship of each subsystem when the CNC machine tool fails, and can correctly reflect the reliability impact between the system and the subsystem, and between the subsystems and the subsystems. If the traditional subsystem reliability analysis method is used, the failure time data of each subsystem is simply selected directly for reliability modeling, ignoring that when the machine tool is used in the fi...

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Abstract

The invention relates to a method for analyzing an influence degree on the reliability of a numerically-controlled machine tool subsystem, belongs to the technical field of numerically-controlled machine tools, and aims to make up the disadvantages in the prior art that the disturbance of fault time of other subsystems of the numerically-controlled machine tool and test censoring time influences are not considered. The method comprises the following steps: (1) reading an operation recording meter of the numerically-controlled machine tool; (2) reading fault time data of the subsystem; (3) establishing a reliability functional block diagram of a numerically-controlled machine tool system and determining a subsystem reliability relation; (4) processing the disturbance of the fault time of the other subsystems of the numerically-controlled machine tool and the test censoring time influences according to censoring data; (5) establishing a reliability model of the numerically-controlled machine tool subsystem; (6) determining the reliability model of the numerically-controlled machine tool system; (7) calculating the influence degree on the dynamic reliability of the numerically-controlled machine tool subsystem; (8) calculating the influence degree on the core reliability of the numerically-controlled machine tool subsystem. According to the method provided by the invention, the reliability model of the numerically-controlled machine tool system is fitted and compared with an empirical distribution function model and the precision is less than 5%; the actual analysis requirements can be met.

Description

technical field [0001] The invention belongs to the technical field of numerical control machine tools, and relates to a method for analyzing the reliability influence degree of a numerical control machine tool subsystem, in particular to a reliability influence degree of a numerical control machine tool subsystem considering the disturbance of failure time of other subsystems of the numerical control machine tool and the influence of test censoring time Analytical method. Background technique [0002] With the increase of composite functions and the introduction of intensive technology, the potential hidden dangers of failures of various subsystems of CNC machine tools have increased. During the normal use of the CNC machine tool, the failure of each CNC machine tool subsystem will cause the failure of the CNC machine tool, and when the CNC machine tool system fails, a component will generate a failure time of its own and truncate the time of all other components , while t...

Claims

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Application Information

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IPC IPC(8): G05B19/406
Inventor 张英芝申桂香薛玉霞李研宋琪荣峰
Owner JILIN UNIV
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