Modeling of the ship and numerical simulation of coupled vibro-acoustic behavior by FEM/BEM

Prediction of the coupled vibration and acoustic radiation from a real ship is a key problem in the naval engineering. The acoustic design must be done in an integration concept. For the whole double-shell ship equipped with multi-stage isolating devices for the power set, theoretical FEM/BEM analysis of the structural vibration, fluid-structure interaction dynamics, and the exterior field pressure radiation has been summarized. A whole ship was modeled by the finite element software ANSYS. The wet modes and coupled vibration velocity are simulated. Then, the velocity of the outer surface was drawn out and set as the acoustic boundary condition. The normal sound intensity of the outer hull was calculated and analyzed by the boundary element software SYSNOISE. This paper gives a useful example for predicting coupled vibro-acoustic behavior of a great naval ship.