Fuzzy Petri net-based fault diagnosis for vacuum system in space environment simulator

Vacuum system is a pivotal system of space environment simulator whose safe and reliable operation is directly concerned with smooth implementation of the whole space environment simulation test. In order to accomplish online status monitoring and fault diagnosis for vacuum system, this paper proposes a hierarchical fuzzy Petri net-based fault diagnosis model for vacuum system. Since the fault with vacuum system is a typical discrete process, Petri net is used to model the fault diagnosis process for vacuum system as a discrete event system. Against the shortcomings of traditional Petri net in handling sophisticated systems such as exorbitant number of nodes and complicated model, the hierarchical fuzzy Petri net is utilized associated with fuzzy logic and the theory of hierarchical fault diagnosis to establish a detailed fault diagnosis model for vacuum system, and verifies the effectiveness of this model via example.