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Design and Research of Machine Fault Diagnosis System

Author: LuZuoSong
Tutor: LvShuPing
School: Harbin Engineering University
Course: Systems Engineering
Keywords: Expert system Fault Tree Fault Diagnosis Knowledge base Inference engine
CLC: TH165.3
Type: Master's thesis
Year: 2011
Downloads: 50
Quote: 0
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Abstract


Widely used in modern large-scale production of machinery and equipment, industrial production and scientific and technological progress and more complex, large-scale, traditional mechanical diagnostic techniques can not meet the actual requirements of diagnostic mechanical equipment. Continuous development and improvement of artificial intelligence techniques to promote the reform of the machinery diagnostic techniques, therefore, the combination of research and application of artificial intelligence with mechanical fault diagnosis technology has great significance. In this paper, starting from the production of the actual situation, usually the lack of the actual situation of the complexity of the work environment of production equipment and most of the production unit diagnostic expert analysis of a combination of expert systems and machine fault diagnosis technology theory and focus to the production asynchronous motor is widely used for diagnosis, design and research motor fault diagnosis expert system, and its structure and key technologies to achieve. The paper first introduces the theory of mechanical fault diagnosis expert system constitutes its part of the key, for the diagnosis of asynchronous motor object analysis of its structure and its failure mechanism, diagnosis expert system framework design rules. Access to knowledge through the fault tree analysis to create the knowledge base as the focus of this study. Upcoming fault tree of knowledge and framework wears fusion, and fault tree minimal cut set the end of events converged to the rules of the conditions of the law, this knowledge representation is not only a good description of the knowledge of the motor constitute, and can make the inference engine design becomes more concise. Another research focus of fault diagnosis expert system inference engine to achieve technology. The paper designed a machine to forward reasoning reasoning reasoning direction, depth-first search for the search strategy. For fault knowledge conflict, the cause of the malfunction important degree sort of conflict resolution, so you can efficiently determine the fault position, push the diagnostic results. ADO database access technology, database and knowledge base creation and management, fault tree fusion to knowledge base management module, the user can update the knowledge base with the premise to understand the the motor specific fault knowledge structure. Finally, program development tools Visual c 2005 Access 2003 database to achieve asynchronous motor fault diagnosis expert system design, and motor testing and validation of the experimental platform to prove its effectiveness and practicality.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Machinery Manufacturing Technology > Flexible manufacturing systems and flexible manufacturing cell > Fault diagnosis and maintenance
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