Donghoon Kang

Long-Term Performance of Recycled Concrete Aggregate for Subsurface Drainage

AbstractRecycled concrete aggregate (RCA) is one of many sustainable construction materials, and its use in drainage systems by replacing virgin aggregate is beneficial from both economic and envir...

Study on variation in ship's forward speed under regular waves depending on rudder controller

ABSTRACT The purpose of this research is to compare and analyze the advanced speed of ships with different rudder controller in wavy condition by using a simulation. The commercial simulation tool named AQWA is used to develop the simulation of ship which has 3 degree of freedom. The nonlinear hydrodynamic force acting on hull, the propeller thrust and the rudder force are calculated by the additional subroutine which interlock with the commercial simulation tool, and the regular wave is used as the source of the external force for the simulation. Rudder rotational velocity and autopilot coefficients vary to make the different rudder controller. An advanced speed of ships depending on the rudder controller is analyzed after the autopilot simulations.