Method for positioning hidden danger of door system of train based on probability petri network
A technology for car doors and trains, which is applied in the field of hidden danger identification, can solve the problems of combination explosion, imperfect fuzzy model construction method, and huge decision table, etc., and achieve the effect of fast and accurate identification and positioning
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Embodiment 1
[0046] Petri net is a mathematical tool suitable for many kinds of systems, especially FDES (Fuzzy Discrete Event System, Fuzzy Discrete Event System) analysis. It has both strict mathematical description and intuitive graphic expression. The car door system is also a typical fuzzy discrete event system. Using Petri nets for fault diagnosis of the car door system is in line with human thinking and cognition. The method establishes a TC-PPN model for the direction of fault propagation, and uses Petri net reasoning and Bayesian probability calculation to quickly and accurately determine fault components.
[0047] The embodiment of the present invention provides a method for locating hidden dangers of a train door system based on a probabilistic petri net. The examples are not limited to this:
[0048] The hidden danger in the embodiment of the present invention means that a certain component does not make a corresponding action at the moment of the action, or the event with a c...
Embodiment 2
[0078] Taking the door system of urban rail train as an example, the specific implementation method is as follows:
[0079] Firstly, the system is decomposed into layers to clarify the connection of the structure of each layer under the functional conditions, and to determine the logic sequence of actions. figure 2 Shown is the structure diagram of the urban rail train door system, image 3 Shown is the flow chart of opening the door of the urban rail train.
[0080] Construct the PPN model. Among them, the line segment with a circle at the front end. Represents the suppression arc; places represent hidden dangers corresponding to abnormal noises during the door opening process, and are named as corresponding events, A1 represents insufficient lubrication of long and short guide posts; A2 represents insufficient lubrication of screw nuts, etc.; other places representative events are shown in Table 1. Example PPN model description table; t 1 ,t 2 ,t 3 ,t 4 ,t 5 ,t 6 ,...
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