Dynamic Behavior of Reflector and Its Effect on the Characteristics of Bunching Sound Field

The nonlinear finite element method (FEM) is used to numerically simulate the characteristics of bunching sound field of underwater plasma sound sources (UPSS). Based on the acceleration histories at different positions on the outer surface of the reflector, the dynamic behavior of the ellipsoid reflector under the action of intense acoustic shock wave and its influence on the bunching gain, the peak pressure of the maximum bunching wave and the focus position are emphatically analyzed. The results show that the elastic deformation of the ellipsoid reflector increases gradually from the bottom to the outlet of the reflector. In order to improve the stress safety margin, the thickness of the reflector should be increased appropriately. By optimizing the reflector profile, the bunching gain can be effectively improved, the ellipsoid reflector can maintain a more ideal shape, and the actual focus is closer to the geometric focus.