Abstract
The authors have been studying about a man overboard accident from a fishing boat, as to give a physical interpretation on this problem. Although the many different processes in which these accidents occur have been observed practically, the most important and common primary factors are considered to be the ship's motions due to ocean waves. One of them is the acceleration of the fishing boat due to ocean waves which will induce incessantly the dynamic unblances of a human body during fishing operation. This paper discribes the two kinds of motion analysis of the salmon gill net fishing boat which engages in typical fishing operations in the North Pacific Ocean. The motions of fishing boats due to ocean waves were calculated by means of the theoretical method which was so called the Ordinary Strip Method. Frequency response functions of 6 degrees of freedom motion of the fishing boat were calculated. Based on these frequency response functions, the distributions of accelerations on working areas of the fishing boats were calculated and the relations between these distributions and the man overboard accident were discussed.
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