SIMPLIFIED MANEUVERING SIMULATION OF A SHIP IN WAVES AT THE MODEL SCALE

Abstract

In the previous research the author showed the simplified maneuvering simulation of a ship in waves at the real ship scale. The simplified maneuvering simulation means the maneuvering simulation including the wave drift forces and moments during the simulation. But the simulation results of S-175 container ship didn’t show good agreement with the free running model test in waves of Prof. Yasukawa. In this research the simulation is carried out at the model scale. To simulate at the model scale the propeller rps is obtained from the empirical formula of resistance and thrust forces. The propeller rps is compared with the one of free running model test, and corrected to adjust the propeller revolution by modifying the resistance force or thrust force. Three kinds of simplified maneuvering simulation are carried out at the model scale. The first one is the simulation without correction of propeller rps. The second one is the simulation with correction of propeller rps by modifying the resistance force. And the last one is the simulation with correction of propeller rps by modifying the thrust force. The simulation results are compared with the free running model test results. And onmore simulation with the wave drift forces and moments in the consideration of drift angles during the turning test is carried out and compared with the simulation results without drift angle considering and free running model test. The dis