Knowledge acquisition method of fault diagnosis knowledge base of turn-milling combined machine tool

A technology of fault diagnosis and compound machine tools, applied in computer control, instruments, simulators, etc., can solve the problems of affecting the diagnosis accuracy, increasing the monitoring cost, and not being able to adapt to the needs of knowledge representation and knowledge acquisition, so as to simplify the knowledge acquisition method, The effect of reducing monitoring costs

Inactive Publication Date: 2010-07-07
BEIJING INFORMATION SCI & TECH UNIV
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Problems solved by technology

At present, the representation of fault knowledge still adopts traditional production rules, frameworks, predicate logic and other forms, which cannot meet the needs of knowledge representation and knowledge acquisition; there is a lack of

Method used

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  • Knowledge acquisition method of fault diagnosis knowledge base of turn-milling combined machine tool
  • Knowledge acquisition method of fault diagnosis knowledge base of turn-milling combined machine tool
  • Knowledge acquisition method of fault diagnosis knowledge base of turn-milling combined machine tool

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Embodiment Construction

[0012] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0013] Such as figure 1 As shown, the present invention builds a fault knowledge meta-model based on knowledge granularity (such as figure 2 shown). The fault samples and historical test data of the turning-milling machine tool are used as the attribute set of the turning-milling machine tool's fault diagnosis and state prediction, and the fault modes of the turning-milling machine tool are used as the fault diagnosis decision set to build a decision table for diagnosis information. Rough set attribute reduction is used to preliminarily reduce and classify the attribute conditions required for various failure modes of turn-milling machine tools, and the attribute and attribute value are reduced based on the binary matrix of the granularity calculation principle, and the rule is calculated based on the coverage and confidence of the rule. Evaluation...

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Abstract

The invention relates to a knowledge acquisition method of the fault diagnosis knowledge base of a turn-milling combined machine tool. The method comprises the following steps: 1. obtaining the fault history information and real-time monitoring information of the turn-milling combined machine tool; 2. performing signal processing, fault characteristic information extraction and data discretization to the fault history information and real-time monitoring information in turn, establishing a knowledge decision table of fault diagnosis by using fault characteristic attribute as condition attribute and fault pattern as decision attribute; 3. based on the established knowledge decision table, performing the reduction based on granule computing of fault characteristic attribute and the reduction of attribute value; and 4. using the confidence and coverage of the rules as evaluation indexes to measure and evaluate the reduced decision. The invention can obtain reduced and effective knowledge and rules for fault diagnosis from a great deal of on-line and off-line data so as to provide effective guarantee for fault diagnosis. The invention can be widely used for the fault diagnosis of various numerical control machine tools.

Description

technical field [0001] The invention relates to a method for diagnosing a fault of a numerically controlled machine tool, in particular to a method for acquiring knowledge of a fault diagnosis knowledge base of a turning-milling compound machine tool. Background technique [0002] As a typical electromechanical system of CNC machine tools, its fault diagnosis and early warning technology is one of the core technologies to ensure the reliable operation of machine tools and improve the service performance of machine tools. As one of the development directions of mechanical processing, compound processing is also a main direction of the development of numerical control equipment. The turning-milling compound machine tool combines the functions of turning and milling, which can realize turning and milling processing of parts in one clamping, reduce positioning errors and loading and unloading time, and greatly improve the processing accuracy and processing efficiency of parts. ...

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Application Information

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IPC IPC(8): G05B19/4065
Inventor 王红军徐小力黄民吴国新
Owner BEIJING INFORMATION SCI & TECH UNIV
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