Simulation on Movement of Fracture Zone and Cavity for Wake Homing Torpedo

The fracture zone and cavity of a ship impose a great effect on a wake homing torpedo, even lead to torpedo reverse guidance, resulting in low torpedo hit probability and high range loss. We analyze the movement law of 3-beam wake homing torpedo in the fracture zone and cavity with different sizes and shapes, and the change law of torpedo′s maximal turning angle with relevant torpedo trajectory through multi-state simulation based on Matlab. Simulation results show that the fracture zone and cavity with smaller sizes (the zone width ≤7.25 m, the cavity radius≤8.24 m) have no effect on torpedo movement, while torpedo turning angle is equal to 0. ;when the turning angle is larger than 0. , torpedo movement is more complex in fracture zone than in cavity, which may provide a reference for trajectory design against fracture zone and cavity of 3-beam wake homing torpedo.