The Changes of Ship Parameters on Stability and Resistance during Operation

Abstract

During the operation of a ship, there are liquids consumption of fuel and water that affect the ship weight, draft and position of weight centre. Consequently, this loading condition affects the ship parameters such as stability, resistance, speed and others. The raising of the vertical centre of weight affects the ship stability while decreasing the draft allows to increase the speed. Two important ship parameters evaluated in this paper are the resistance and stability. To prove this phenomena, two semidisplacement ships were designed, computed and evaluated. The resistance and stability parameters were computed at ship departure, during operation and arrival conditions. To confirm the results of computation, two ship models were developed and tested in the towing tank to validate the effects of draft, resistance and speed during travel time. The stability parameters were evaluated during the changes of loading conditions. The results of ship resistance and stability are presented in equation forms and show the changes of ship speed, travel time, and the quality of stability parameters.