Bayes-method-based spaceflight valve part fault diagnosis method in machining process

Abstract

The invention discloses a Bayes-method-based spaceflight valve part fault diagnosis method in the machining process and belongs to the technical field of expert systems and fault diagnosis. The method includes the steps that first, a data control chart in the spaceflight valve part machining process is drawn, and the abnormal modes of the control chart are recognized according to a certain judgment rule; then, a relational network between the fault causes and the fault results in the spaceflight valve part machining process is described through FMEA and FTA, and an expert system knowledge base is built; finally, the set of main fault causes is acquired through importance analysis and the Bayes' theorem, and the list of causes which are most likely to cause the abnormal modes of top events is calculated. Through the spaceflight valve expert system fault diagnosis method, quality monitoring and fault diagnosis can be performed in the spaceflight valve part machining process containing a large number of data sets, the defects in the aspect of data standardization in an existing method are avoided, and meanwhile an expert diagnosis system for the special objects of spaceflight valves is developed.

Description

Technical field: [0001] The invention relates to the technical field of aerospace valve parts processing, and more specifically relates to a fault diagnosis method for aerospace valve parts machining process based on Bayesian method. Background technique: [0002] With the rapid development of industry, the structure of modern equipment is becoming more and more complex, the scale of automation is increasing, and the coupling of each structure and each stage is getting closer. On the one hand, the subsequent increase in the level of system automation has brought considerable economic benefits to production, on the other hand, the factors affecting the operation of the system have increased sharply, leading to an increase in the potential for failure. Modern production has higher requirements for the availability, safety, reliability and maintainability of mechanical equipment, which has led to people's research on fault diagnosis technology. [0003] Aerospace valves are co...

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Problems solved by technology

[0005] Aiming at the technical problems existing in the above-mentioned prior art, the present invention provides a fault diagnosis method for aerospace valve parts machining process based on the Bayesian method, which overcomes the various causes of faults and failures in the manufacturing process of aerospace valves, which cannot be directly performed by listing methods. To deal with the shortcomings, a fault diagnosis method for aerospace valve parts machining based on control chart theory, FMEA and FTA analysis, and Bayesian method is proposed

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