Experimental studies on ship manoeuvrability in restricted waters

Subtitle: Part I

Article type: Research Article

Authors: Fujino, Masataka

Affiliations: University of Tokyo, Japan

Abstract: This paper deals with the ship manoeuvrability in restricted waters, separating the problem into two parts, that is, shallow water effect and finite channel width effect. At first, the author introduce linearized equations of motion with asymmetric hydrodynamic force caused by the presence of walls. Each coefficient of the equations of motion was determined experimentally by means of forced yawing technique, while the asymmetric hydrodynamic force coefficients were determined by straigth tow test. In this part, it is examined in detail to what extent each coefficient is affected by finite water depth and finite channel width. Then, the change of the course keeping quality in restricted waters is also discussed. It is shown that a ship tends to be more stable on course in shallow water except certain range of medium depth of water, and that a ship tends to be unstable in channels. A detail of ship motions in channels will be discussed in Part II in later days.

DOI: 10.3233/ISP-1968-1516801

Journal: International Shipbuilding Progress, vol. 15, no. 168, pp. 279-301, 1968