50노트급 고속 경비정의 선형개발에 관한 연구

Abstract

'The United Nations Agreement in Law of the Sea' which was come into effect in 1994 defines the oceanic jurisdiction for all nations. It established the principle of a 200-nautical mile limit on a nation's exclusive economic zone (EEZ) whereby a nation controls the undersea resources, primary fishing and seabed mining for a distance of 200 nautical miles from its shore. In case of declaration, a solution should be approached fairly by mutual consent that makes a border if the EEZ overlaps with other countries. Under these circumstances, 'The New Korea-Japan Fishery's Agreement' was that the negotiation started on August in 1996 and was signed on November 11. Finally it came into effect on January 22 in 1999. Also 'The Korea-China Fishery's Agreement' was signed on August 3 in 2000 and was come into effect on July 30 in 2001. After that, new fishery regularity has been formed around Korean waters. These days, Japan and China have been promoting constructions and development of patrol boats continuously for national securities of their territorial waters. Against the neighbor countries' actions, a high-speed patrol boat should be secured and supplied to protect the ocean sovereignty of EEZ in the area of sea around Korea. In Korea Coast Guard, an aluminum patrol boat P-134 having maximum speed of 45 knots among100 ton class has been put into service in 2005. But it needs to be researched and developed in the performance and scale aspect to adapt changes of Japan and China. In this study, a plan for designing the primary hull form has been provided based on the increasing demands of high speed patrol boats that can be worked in offshore as well as the coast, and the initial hull form of a 50 knots, 100-ton class patrol boat has been developed. Characteristics of the planing boat of a 50 knots class patrol boat were studied. Also the domestic and foreign research trend in the processes of hull form developing has been analyzed. The fundamental performance of the developed hull form has been confirmed, hydrodynamic characteristics and the resistance performance were observed by the model test in high speed circulating tank. The effect of attached Side-Fin on the ship's side has been analyzed in order to improve the resistance performance. The initial trim condition effects on the resistance performance were also analyzed. The characteristics of resistance performance of the developed hull form were verified by computational fluid dynamic (CFD) technique. Conclusions 1) Feasible plans were presented when determining principal particulars in initial design of high speed ship. Also an analytical approach based on actual data can be useful. 2) Initial trim affects the resistance performance. As the initial trim is increasing, the resistance performance is excellent. But it is predicted that excessive running trim in high-speed area will affect the safety performance in waves. Therefore when developing the hull form of a high speed Planing boat, it is very important to determine the optimized initial trim. 3) The Side-Fin can help with improving the resistance performance. Especially it can raise the hull in the high-speed area. However if lift that acts at wings works at the back of center of buoyancy, the body of ship rises in stern and the phenomenon of squat occurs in bow. Hence decreased running trim can cause an increase in resistance. Accordingly it is required to determine the proper size and the position carefully. 4) The method of numerical analysis which ignores the viscosity offers similar tendencies compared to model test in the developed initial hull form of a high speed Planing boat.