A Hybrid Numerical Analytical Method for Calculating Hydrodynamic Self-Noise of Ribbed Acoustic Window

For the acoustic optimization design of the sonar acoustic window which is the ribbed shell structure, the sonar part is simplified into a regular model composed of an elastic rectangular plate and a rectangular cavity. The structural modal vibration is solved by finite element numerical method, Rayleigh integral equation of external infinite sound field is solved by approximate structural modal functions, and internal finite sound field is solved by theoretical analytic method. Establishing an equation of vibro-acoustic and considering the character of temporal-spatial random surface excitation, a fast calculation method for the hydrodynamic self-noise of the sonar part is formed based on the hybrid numerical analytical method. Taking an elastic plate as an example, the hydrodynamic self-noise of the sonar part is calculated and the result is compared with that calculated by the theoretical analysis method and numerical transfer function method, verifying the accuracy and computational efficiency of the hybrid method.