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강일권,윤점동,조효제 한국항해항만학회 1998 한국항해학회지 Vol.22 No.2
In the field of research of seakeeping quality, much development has been made incent years using the method of calculation based on the strip theory. It is indispensable to grasp quantitatively the seaworthiness of a ship in order to draw correct design at initial stage and to perform proper operations at sea services. In this paper, the responses of three fishing vessels are calculated using statistical and spectral analyzing method to get the characteristics of the motion response. From the theoretical result we know that the significant values of the pitching and rolling motion can be signiicantly affected by not only the ship's tonnage but also the mean wave period in spite of the similar sea environment. So we can apply these expected results to the safe maneuvering and fishing operations in rough weather conditions by combining environmental circumstance with the stability condition of vessels.
강일권,윤점동 한국항해항만학회 1995 한국항해학회지 Vol.19 No.1
The motion of a small boat in seas is affected in relatively higher degrees than the case of a larger ship by the specific characteristics of sea waves, i.e., the wave length and height. Ship's motion caused by sea waves is a matter of special importance to small fishing boats, because they carry out fishing job in rough seas frequently. This is an experimental study on the rolling and pitching motions of full scale ship. In the experiment, the ship's motions were measured for head, how, beam, quarter and following seas. The experiment were carried out on board the training ship Pusan 404(160 GT) in the adjacent waters off NAM HYENG JAE DO on Dec. 13th 1994. The sea condition during the measurements was that wave height 2.5m, no swell and the wind velocity of 12 m/sec. Some statistic considerations were given to the observed data by the series analysis methods and discussed in this paper.
강일권,윤점동,조효제 한국항해항만학회 1996 한국항해학회지 Vol.20 No.3
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.
강일권,윤점동,조효제 한국항해항만학회 1998 한국항해학회지 Vol.22 No.2
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 seakeeping qualities. For this purpose, we measured pitching and rolling response of three fishing vessels in seas using real seas experimental measuring system and analyzed the data by statisticawl and spectral analyzing method. We compared the measured results with theoretical results to give the validity of measuring system and experimental results. From the result we know that a good agreement between the experimental and theoretical results are shown except following seas. But there are little difference between both results in the other deirection too, which are caused by the effects of short crested waves of real seas.