Author(s): Hyoil Kim; Junji Sawamura
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Keywords: No Keywords
Abstract: In this study, a numerical simulation related to ship-ice interaction in the 3D virtual ice terrain generated by the midpoint displacement algorithm based on the fractal theory is introduced to verify the effectiveness of application of ice-going ship. The method widely used in computer graphic field for making 3D virtual terrain is used to make random level ice regimes. Statistically different ice conditions (thin and thick) are selected for them. With respect to the calculation of ice loads, crushing and bending forces are considered for the simplicity of simulation. The ice submerging force is neglected. In addition, empirical equations are used to determine the size of ice bending failure and ice bending force. For ship motion, the linear coupled differential equations of motion based on the Newton’s second law are used. The motion equations are solved by numerical integration. Simulations are respectively carried out in constant speed and 3DOF (surge, sway and yaw directions) motions. In the constant speed motion, the relationship between ice thickness and ice load is quantitatively analyzed by correlation coefficient. In 3DOF motions, the influences of ship motion on ice loads are investigated by comparing with constant speed motion. In addition, it is looked into which one is the most important factor to affect ice loads for the structural design, ship performance and maneuverability of ice breakers. As a result, it is verified that applying 3D virtual ice terrain to the ship-ice interaction simulation is effective way to obtain the relationship between ice thickness and ice loads as well as more realistic simulation.
Year: 2014