Research and Application of FTA and Petri Nets in Fault Diagnosis in the Pantograph-Type Current Collector on CRH EMU Trains

Abstract

A fault tree is established based on structural analysis, working principle analysis, and failure mode and effects analysis (FMEA) of the pantograph-type current collector on the Chinese Rail High-Speed Electric Multiple Unit (CRH EMU) train. To avoid the deficiencies of fault tree analysis (FTA), Petri nets modelling is used to address the problem of data explosion and carry out dynamic diagnosis. Relational matrix analysis is used to solve the minimal cut set equation of the fault tree. Based on the established state equation of the Petri nets, initial tokens and enable-transfer algorithms are used to express the fault transfer process mathematically and improve the efficiency of fault diagnosis inferences. Finally, using a practical fault diagnosis example for the pantographs on CRH EMU trains, the proposed method is proved to be reasonable and effective.

Risk Analysis of Coupling Fault Propagation Based on Meta‐Action for Computerized Numerical Control (CNC) Machine Tool

“…Subsequently, in order to evaluate the effect of metaaction ( = 1, 2, ⋅ ⋅ ⋅ , ) fault on other units in the whole fault network diagram, the spontaneous probability of ( = 1, 2, ⋅ ⋅ ⋅ , ) fault is assigned to 100%, while the initial probability of other meta-actions is assigned to 0%, that is, the initial vector = . Formula (10) gives the evaluation of risk criticality.…”

“…Meanwhile, there is an indeterminate coupling relationship between subsystems and subsystems, or between units and units, thus forming a complex coupling propagation process, which brings certain difficulties to product design engineers. Commonly used reliability analysis methods include FMEA [1][2][3], FTA [4,5], Bayesian [6,7], Markov [8,9], and Petri net [10,11]. These methods mainly judge fault behavior based on single index such as failure rate, risk value, and fault propagation probability, and they analyze each event as an independent event.…”

A New and Practical Reliability Allocation Method for a Complex System of NC Turrets

“…Meanwhile, the weight among these four attributes is also determined by this way. According to the detailed calculation process of AHP [23], the allocation relative weight w FM i of FMs can be obtained. And the new happening probability of FM is…”

“…Experts are unable to accurately evaluate the performance of all components by themselves. Failure mode and effects analysis (FMEA) [22] and fault tree analysis (FTA) [23] as a usual failure analysis tool help experts understand the relationship between components and failure modes in a complex system. Most research studies calculated the allocation weight according to the RPN of their all possible failure modes obtained by FMEA [1,2,4].…”

Modeling method of failure dependent system based on time varying copula function

“…Reviewing previous studies, we can find that the research on the failure dependent system mainly concentrate on two aspects: one aspect is based on the components to establish the logical model of the system and parameter model, and specific parameters of common cause are introduced to quantify the influence of the common cause failure [1][2][3][4]. the other aspect is typical failure modeling approach based on the observation data of performance parameters.…”