Characteristics of Hydrodynamic and Acoustic Radiation of Damaged Stiffened Plate in Water

The characteristics of hydrodynamic and acoustic radiation of damaged stiffened plate in water were studied using FEM/BEM methods. The concept of damage was incorporated in the FEM method when forming the stiffness matrix of stiffened plate model. The effect of fluid on the structure was considered to be the added mass matrix. The damaged structure was calculated in terms of natural frequency, vibration model and transfer function. Furthermore, the radiation power and radiation directivity was computed over a special frequency range.