港内操船における曳船の支援効果について-I

抄録

The tugboat assistance is very important for the ship maneuvering in harbour but the standard way of tugboat assistance has not been studied enough. Further, in the case of using tugboats, the operator must understand fully about the characteristics of turning motion. Therefore the characteristics of turning motion under the tugboat assistance is discussed, using the time and area required in turning motion. The summary results are as follows. (1) If the ratio of thrust of fore and after tugboats is constant, increment of thrust make no change of the area required in turning. (2) Adjustment of thrust of fore and after tugboats reduce the area required in turning. (3) It is important to control the initial speed in turning. Because the area required in turning increases in proportion to the initial speed. (4) The usage of main engine and rudder reduce the area required in turning.