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Process Fault Diagnosis Based on Graph Theory

Author: WangMianYu
Tutor: LiangJun
School: Zhejiang University
Course: Systems Engineering
Keywords: Troubleshooting Graph Theory Fault propagation digraph Signed directed graph
CLC: TP277
Type: Master's thesis
Year: 2002
Downloads: 522
Quote: 12
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Abstract


With modern large-scale industrial processes and complex systems is developing rapidly, there is an urgent need to improve the system reliability and security, in order to avoid accidents and even system crashes caused huge economic losses. Therefore, research and development has set control, monitoring, and diagnostic functions in a process monitoring system has become integrated factory automation development of the urgent need, has important theoretical significance and wide application value. Fault diagnosis by monitoring the operational status of the production process, constantly changing and fault detection process information, and the fault is generated, quickly locate the source of the fault, isolate and eliminate the fault, in order to prevent catastrophic accidents, product quality while reducing the volatility of to improve the competitiveness of their products. Fault diagnosis based on graph theory is fault diagnosis is an important research branch. In this paper, graph theory as the theoretical basis for the practical application as the ultimate goal, in a broad access to relevant literature, understanding of relevant research, based on the system and in-depth study of certain important aspects of this approach, the main research contents and results are as follows : 1. Describes the research of fault diagnosis, classification of various methods and development trends, especially for fault diagnosis based on graph theory approach to the development and current situation of the complete overview; 2. Systems, discussed in detail based on graph theory fault diagnosis theory and methods, and in this study based on a directed graph based on fault propagation fault diagnostic method modeling, hierarchical and fault localization and other issues; 3 . To develop a directed graph based propagation diagnostic system as the target, to establish communication for behavior simulation model has been studied, the proposed use of object-oriented technology of fault propagation digraph class design. Gives a simple algorithm for improved diagnosis. 4. Pointed out that the spread of a directed graph based on the diagnosis of the inadequacies of the law, systematically expounded based on signed directed graph (SDG) fault diagnosis method, and the method of diagnosis for the shortcomings of slow, the introduction of the SDG method and expert system combines thinking, explains how SDG generated by the diagnostic rules, and use a calculation example to illustrate this. 5. Developed a model for building fault propagation simulation software tool. Finally, for fault diagnosis of a variety of research methods were simple comparative analysis, and pointed out the fault diagnosis based on graph theory methods of some worthy of attention and study them in depth aspects.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Monitoring, alarm,fault diagnosis system
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