Calculating The Dynamic Responce Of High-speed Catamarans In Head Waves

The movement of high speed catamaran in the wave is a quite complicated course. In recent years, study about the movement of high speed catamaran had become the important subject in the shipping hydrodynamics domain. Due to the relationship of the characteristic of high speed catamaran liquid impetus and effect of the non-linearity, we cannot forecast exactly use the linear theory. So it is necessary to develop a research method that it would take the non-linearity factor into account.This text researched the non-linearity movement of the high speed catamaran that meets the ocean wave. Take the change of the instantaneous damp surface that bring every non-linearity factor into account, establish the non-linearity movement equation and solve it in the time-field. Thereinto, the calculation of the strength of the incidence wave and the whisht water reversion according to the object surface on the instantaneous damp surface, the solving of the strength of radiation according to the radiation potential that containing the memory effect, the solving of the strength of circle radiation through the linear frequency field method.This text selected a characteristic ship model at last, calculated the heaving and the pitching movement correspondence of catamaran at different speed. I found that slice up theory forecast result and the experimental result existed the warp by all means. At the circumstance of high speed of the ship, the distinction of the slice up theory forecast water impetus coefficient and movement respond and the experimental result are great. The cause that bring this circumstance is the effect of the slice up theory omit the speed of the ship in the free surface. It made free surface of the speed of the ship two dimension zero speed of the ship free surface.