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RISS 인기검색어
- 검색키워드
- 저자 : Jeom-DongYoon (검색결과 2 건)
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Jeom-DongYoon,Deok-SuLee 한국항해항만학회 2002 한국항해항만학회지 Vol.26 No.6
It is very important and necessary for safe maneuvering and piloting of a VLCC to know the quantity of her hull sinkage and trim changes in advance when she enters into shallow water area from deep sea. It is already well known that the quantity of sinkage and trim of a vessel change when she navigates between the sea areas of different depths.In this paper, the authors induced five mathematic formulas to compute the quantity of hull sinkage and trim changes arising from the different conditions and speeds of vessels and sea depth. Also they checked and examined the conditions of 131 VLCC class vessels with the over all lengths between 200 to 360 meters and evaluated mean values of Cb, Lpp/B, Lpp/ dm, trim and mean draft(dm) of them according to the different groups of length and loaded conditions.Using the calculating math formulas and loaded conditions, the authors made math tables to find the quantity of hull sinkage and trim changes due to the different size, condition and speed of vessels and the depth of sea.
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Jeom-DongYoon,Deok-SuLee,Keung-SuLim 한국항해항만학회 2002 한국항해항만학회지 Vol.26 No.6
The maneuvering indices K for ship's turning ability and T for ship's course keeping ability are very important values to evaluate the maneuvering characteristics and the motions of a vessel. When a vessel is built in the shipyard they carry out many kinds of sea trials including Z test trials to compute the numerical values of maneuvering indices. They carry out Z test during the sea trial period but they generally make only the graphs of heading angles showing the first, second and third overshoot angle without calculating the numerical values of indices K and T. They normally do not calculate the numerical values of K and T because the calculating and processing methods are a little bit complicated ones and ship owners and the master of the vessel generally do not require the shipyard to calculate the values and submit the results to them.For this reason, the authors studied on more simplified testing and calculating methods and carried out both of the actual sea trial tests of usual Z tests and more simplified tests using the training vessel Saeyoodal of Mokpo maritime university and calculated K and T indices from both trials. The calculated values from both trials are coincided with each other very well and the results were good and satisfactory.
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