Abstract
The paper presents a series of simulation results obtained with an integrated time-domain seakeeping and maneuvering dynamic model for the self-propelled ONR Thumblehome vessel in waves. A four degrees of freedom (surge/sway/yaw/roll) lumped-parameter model for maneuvering in calm water is first developed and verified against results obtained from another system based model. Memory effects due to radiated waves and incident wave induced forces are then incorporated into the maneuvering model to be able to simulate the maneuvers of the same ship in waves. The proposed combined maneuvering/seakeeping model is validated against available experimental results on the self-propelled ONR-T model using zigzag tests in head and following waves. Special attention is given to the analysis of the transient loading of the propellers when the ship executes a 20/20 zig-zag maneuvers in calm water and in waves.
