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Theoretical study of fault diagnosis based on Petri Net and its application on the maglev train

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Tutor: LongZhiQiang
School: National University of Defense Science and Technology
Course: Control Science and Engineering
Keywords: Fault Diagnosis for the maglev train,Petri Net,WinCE,GUI control library,Fault D
CLC: U267.9
Type: Master's thesis
Year:  2005
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With the technology of maglev train becomeing more and more practicable, fault diagnosis for the maglev train has been attached more and more importance to. In the dissertation, a fault diagnosis theory based on Petri Net was studied and then used on the maglev train.In the dissertation, we firstly introduced many concepts of Fault Tree Analysis theory (FTA/DFTA) to the Petri Net. According to the fruits of lots of related theories, a comparatively systematic fault diagnosis theory based on Petri Net was founded, which is called Petri Fault Net (PFNet). PFNet makes full use of the strong modeling capacity of Petri Net to break through the constraint of the Tree structure of FTA/DFTA, and allows a Net structure. PFNet makes use of the continuity of token¡¯s value to break through the Boolean logic of FTA/DFTA. PFNet gives strict definitions and practicable calculation theorems to Possibility of places and transitions. PFNet refers to the idea of Tree-Construction flow of FTA/DFTA, and gives a Net-Construction flow. PFNet gives a practicable algorithm for finding the minimum cut set of a PFNet, and it makes use of the basic analysis methods of Petri Net to solve the Fault Ascertainment Problem and Fault Prediction Problem.Theory comes from practice, and is verified by practice. Subsequently, in the dissertation, we summarized the related information of maglev train, and founded an integrate fault model of the maglev train. PFNet was then used here to analyze the fault model. Based on the result of the analysis, many suggestions for improving the reliability of the maglev train were come up with.By the guidance of the PFNet theory, the project practice part of the dissertation gave a detailed developing process of the Fault Monitor and Diagnosis Software (FM&D) for the maglev train, including software analysis, software design and implementation. The fruits of the process were the analysis model, the design model and the executable code. In the FM&D design model, a technology sustain scheme was introduced. A GUI (Graphic User Interface) control library was included in the scheme and was used for separating the functional parts of FM&D from its interface. The existence of the GUI control library makes the developing of FM&D much simpler. The practicable technology for develop the GUI control library on WinCE platform was summarized by the author and given in the dissertation.
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