In the previous papers, the author showed the transient response method was effective for research on longitudinal ship motions in waves, wave exiting forces and hydrodynamic derivatives.
In this paper, at first, the transient response methods are applied to the hydrodynamic pressures in waves, diffraction pressures in waves and radiation pressures.
The following conclusions can be deduced from these studies.
1) Testing ship model in transient water wave is a useful method for study on ship hydrodynamic pressure in waves.
2) Transient forced oscillation is a useful technique for research on the radiation pressure.
3) The good correlation between the calculated values by Ordinary Strip Method and the experiment results is obtained with respect to the hydrodynamic pressures in waves and these components.
In the next place, testing ship model in high transient water waves is adapted for investigation on impact pressures acting on ship hull. Obtained results are as follows.
1) Phenomenal violent cruising conditions can be easily actualized by the testing in high transient water waves.
2) Very violent impact pressures on stem can be measured by the experiments in high transient water waves.
3) Measured highest impact pressure on stem reachs about 200m water head. It is considered that these very high impact are found out the phenomenon named “normal impact”.