A Study on Effective Braking Force Considered Ship-Tugboat Interaction

Abstract

In this study The effective braking force is approached by dividing ship-tmgboat interaction i to two interference components, namely on the tugboat's braking force in ship's wake and on ship's hull resistance. First the interference component on the tugboat's braking force is predicted considering the scaLe efTect of ship's wake velocity d{stribution, and using the braking force ceefficient of tugboat-self in the uniform flow<2). Next, the interference omponent on ship's hull resistance is also estimated under an assumption, which this component in fu11 scale ship is in proponion to Schlichting's frictional resistance as the component obtained in scale model experiments being a constant. Finally, the eflbctive braking force for fuII scale tugboats was predicted by using the experiment data and the assumptions