By analyzing the structural composition and fault characteristics of a certain type of tank gun control system, the method of establishing the fault tree model is introduced. In order to solve the problem of the low-level repetitive events and incapable of dynamic diagnosis of fault tree in complex systems, the Petri net modeling method was applied to the fault diagnosis model. On the one hand, the diagnosis is performed using the incident matrix and the state equations, which improves the speed and efficiency of fault diagnosis. On the other hand, through the assignment and transfer of token, we can dynamically show the specific propagation process of the fault of gun control system. Combining with a certain type of test system in the project group, the application of petri net in fault diagnosis of gun control subsystem was realized. Introduction The tank working environment is complex and varied, and the work intensity is high. These factors can easily lead to various types of faults such as component damage and equipment operating parameters. Tank gun control system plays a role in stabilizing and controlling artillery, and its failure will affect the performance of the tank's firepower [1] . Therefore, the rapid diagnosis of the gun control system is of great significance. Figure 5 shows the structure of the gun control system. In the 1960s, various types of fault diagnosis methods were gradually applied in military equipment and currently mainly include knowledge-based methods, analytical model-based methods and signal processing-based methods. Knowledge-based methods do not require precise mathematical models and have good diagnostic results. [2,3] At present, the fault tree analysis method has been widely used in tank fault repair, but there are still difficulties in building trees. The minimum cut set calculation is easy to produce combined explosion, neglecting the timing relationship of fault occurrence, and cannot dynamically express the fault propagation process. The petri net model tool has both an intuitive graphical representation and a rigorous mathematical definition, and is increasingly applied to various fault reasoning models. Ling-xun D et al. use the hybrid Petri net to represent the interaction between the continuous system and the discrete system and the evolution and operation of the system, and realize the autonomous decision of the tank fire control system. [4] Basile F et al. proposed a state estimation and fault diagnosis program for a labeled time Petri net system, which solved a certain number of linear programming problems in fault diagnosis tasks. [5] Jiang Z et al. proposed a method of simulating TPTS and its control system structure using a petri net to construct a controlled system with a battery energy storage system to avoid output interruption during fault detection and recovery of some important ES. [6] In this paper, the fault tree model is compared with the petri net. The petri net model is established by taking the common faults of the gun control system as an example. The fault is diagnosed by linear algebraic analysis method. The validity of the fault is verified by an example.
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