Hydroelastic analysis of global and local ship response using 1D–3D hybrid structural model

Abstract

For relatively ‘soft’ floating bodies (very large ships, floating airports, etc.) using the classical rigid body seakeeping analysis and modelling the hydro-structure interface by the transfer of the pressure is not sufficient. The most appropriate method for rational design is the hydroelastic coupling by solving the interaction between the surface waves and the rigid-elastic body. In this paper, a hybrid structural model based on one-dimensional (1D) beam elements and three-dimensional (3D) finite element elements is developed and used for the analysis of wave induced ship vibrations. Using a hybrid model, both global and local structural response can be determined. The coupling between structural and hydrodynamic model is performed using the modal superposition method. The complete hydroelastic response (motions, accelerations, stresses, …) of a floating unit is performed by using 1D–3D hybrid structural model with 3D hydrodynamic model and compared with full 3D structural model coupled with 3D hydrodynamic model.