ABSTRACT:

High-sped car ferries require not only high speed performance but also wide deck breadth for excellent habitability, good stability and large deadweight, giving pleasant sea travel in a short time. In this paper, aiming at further improvement in performance of high-speed ship and pursuit of the possibility of trimaran especially, wave-making mechanism and resistance characteristics were investigated by linear theory, wave analysis and resistance test. The applicability of linear theory and wave analysis to design the multi hull ship is considered.

INTRODUCTION

In recent years, there have been a lot of new proposals and construction of the 100m class high-speed car ferries which run by more Mkts, including o n e running at the maximum speed 60 kts, and 120 m class trimaran has gone in service commission since 2005. High-speed car ferries require (1) wide deck breadth (small M) for excellent habitability, good stability and large DW and (2) high speed performance, giving pleasant sea travel in a short time. In case of mono hull, small J f l increasing wave resistance conflicts high-speed performance so the ship speed 1s limited under same engine power. In case of multi hull, small L/B can be attained easily increasing the clearance of each demihull and high-speed performance is also obtained by applying large L/B of demihull, so higher speed can be obtained comparing mono hull. In this research, aiming at further improvement in performance of high-speed multi hull ship of 45 - 60 kts (Fn=0.60 ~ 0.90) and pursuit of the possibility of trimaran especially, wavemaking mechanism and resistance characteristics were investigated by linear theory, wave analysis and resistance test. Linear wave making theory in the high-speed range, especially over last hump has been said to sufficiently well explain wave-making mechanism as compared that in medium-speed range.

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