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It is important to investigate the hull response of a fishing vessel in waves to ensure the safety of it and to keep excellent sea-keeping qualities. For this purpose, we measured the response of fishing vessels in waves using real sea experimental measuring system. We analyze the experimental data by statistical method and spectral analysis to get the characteristics of the response of vessels which have different tonnage. In this real sea experiment, we use three stern trawlers which are the training ship in university. We know that the distribution of experimental response have Gauss distribution and Rayleigh distribution and smaller vessels have larger response.
It is indispensable to grasp quantitiatively the seaworthiness of a ship in order to draw correct design at initial stage and to perform proper operations at sea service. In the field of research of sea keeping quality, much development has been made in recent years using the method of calculation based on the strip theory. It is very important to investigate the. hull response of a fishing vessel in waves to ensure the safe navigation and fishing operation in rough seas by preserving excellent sea keeping qualities. For this purpose, the author measured various responses of three fishing vessels in waves using real sea experimental measuring system. In real sea experiments, the author used three stern trawlers, Pusan-404 (160GT), Kaya (1737GT) and Saebada (227SGT). The experiments were carried out on board the three training vessels on the adjacent waters off Korea and the Eastern China Sea during training operations. The author analyzed the experimental data using statistical and spectral analyzing method to get the characteristics of the motion responses of the above three different vessels in size and type. The results obtained can be summarized as follow : (1) The statistical distribution of pitching, rolling and heaving for each fishing vessel were found to be coincident with the Gauss distribution and the double amplitude oscillations in each motion were found to be coincident with the Rayleigh distribution. (2) Rather higher amplitudes of pitching motion in both experiments and calculations appeared in head sea and bow sea than those in quartering sea and following sea, and rather higher amplitudes of rolling motion in beam sea and quartering sea than in bow sea regardless of ship's tonnage. (3) The comparisions of theoretical results with those of experiments for the pitching motions according to encountering wave angle show that the theoretical values are higher than those of experiments in all directions except in beam sea and the period at which the peak appears in both calculations and experiments has good agreement in head sea and bow sea, but not in quartering and following蘿 sea. In the rolling motions, the theoretical values are higher than those of experiments in beam sea, but good agreement in quartering sea and bow sea each other, and the period at which the peak apears has shown good agreement with those in beam sea, but not in quartering sea and bow sea. (4) The author calculated the responses of two vessels under a assumed wave of 2.2m height and 5.Osec period and the results showed that the response of pitching motion of ship-A are 4 times bigger than those of ship-C in head and bow sea, and 2 times in quartering and following sea. The response of rolling motion of ship-A are 3 times bigger than those of ship-C in bow sea, and 4times in beam sea and quartering sea. In conclusion all of the above results can be utilized for safe maneuvering and fishing operations in rough weather conditions by combining envimnmemtal circumstance with the stability condition of vessels. '