Design of high-speed planing hulls for the improvement of resistance and seakeeping performance
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High-speed vessels require good resistance and seakeeping performance for safe operations in rough seas. The resistance and seakeeping performance of high-speed vessels varies significantly depending on their hull forms. In this study, three planing hulls that have almost the same displacement and principal dimension are designed and the hydrodynamic characteristics of those hulls are estimated by high-speed model tests. All model ships are deep-V type planing hulls. The bows of no.2 and no.3 model ships are designed to be advantageous for wave-piercing in rough water. No.2 and no.3 model ships have concave and straight forebody cross-sections, respectively. And length-to-beam ratios of no.2 and no.3 models are larger than that of no.1 model. In calm water tests, running attitude and resistance of model ships are measured at various speeds. And motion tests in regular waves are performed to measure the heave and pitch motion responses of the model ships. The required power of no.1 (VPS) model is smallest, but its vertical motion amplitudes in waves are the largest. No.2 (VWC) model shows the smallest motion amplitudes in waves, but needs the greatest power at high speed. The resistance and seakeeping performance of no.3 (VWS) model ship are the middle of three model ships, respectively. And in regular waves, no.1 model ship experiences ‘fly over’ phenomena around its resonant frequency. Vertical accelerations at specific locations such as F.P., center of gravity of model ships are measured at their resonant frequency. It is necessary to measure accelerations by accelerometers or other devices in model tests for the accurate prediction of vertical accelerations in real ships.
Abstract
High-speed vessels require good resistance and seakeeping performance for safe operations in rough seas. The resistance and seakeeping performance of high-speed vessels varies significantly depending on their hull forms. In this study, three planing hulls that have almost the same displacement and principal dimension are designed and the hydrodynamic characteristics of those hulls are estimated by high-speed model tests. All model ships are deep-V type planing hulls. The bows of no.2 and no.3 model ships are designed to be advantageous for wave-piercing in rough water. No.2 and no.3 model ships have concave and straight forebody cross-sections, respectively. And length-to-beam ratios of no.2 and no.3 models are larger than that of no.1 model. In calm water tests, running attitude and resistance of model ships are measured at various speeds. And motion tests in regular waves are performed to measure the heave and pitch motion responses of the model ships. The required power of no.1 (VPS) model is smallest, but its vertical motion amplitudes in waves are the largest. No.2 (VWC) model shows the smallest motion amplitudes in waves, but needs the greatest power at high speed. The resistance and seakeeping performance of no.3 (VWS) model ship are the middle of three model ships, respectively. And in regular waves, no.1 model ship experiences ‘fly over’ phenomena around its resonant frequency. Vertical accelerations at specific locations such as F.P., center of gravity of model ships are measured at their resonant frequency. It is necessary to measure accelerations by accelerometers or other devices in model tests for the accurate prediction of vertical accelerations in real ships.
참고문헌 (12)
- A systematic study of the rough-water performance of planing boats, "Fridsma, G.", Stevens Institute of Technology, ~, pp.Report 1275 (1969)
- Gerritsma, J., "Sailing yacht performance in calm water and in waves", 11th Chesapeake Sailing Yacht Symposium, Annapolis, USA (1993), Society of Naval Architects and Marine Engineers. Chesapeake Section
- Ikeda, Y., "Development of an experimental method to assess the performance of a high speed craft(1st Report)– Development of a high speed towing system", Journal of Kansai Society of Naval Architects, 223, pp.43~48 (1995)
- Ikeda, Y., "Development of an experimental method to assess the performance of a high speed craft(2nd Report)– Hydrodynamic forces acting on series models running with high speed", Journal of Kansai Society of Naval Architects, 226, pp.77~84 (1996)
- Katayama, T., "Characteristics of motion for planing craft in head wave at very high-speed", Journal of Kansai Society of Naval Architects, 233, pp.55~62 (2000)
- 김동진, "활주선의 하중 및 무게 중심 위치 변화가 항주 자세에 미치는 영향에 대한 연구", 대한조선학회 논문집, 46(3), pp.335~342 (2009), 대한조선학회
- 김동진, "정면 규칙파 중 활주형 고속선의 운동 응답에 대한 실험적 연구", 대한조선학회 논문집, 46(4), pp.373~381 (2009), 대한조선학회
- 김주남, "45노트급 고속정의 초기선형 개발과 저항성능에 관한 연구", 한국해양공학회지, 20(1), pp.32~36 (2006), 한국해양공학회
- 이귀주, "50노트급 활주형선의 저항성능 개선을 위한 부가물 부착에 관한 실험적 연구", 한국어업기술학회지, 41(3), pp.222~226 (2005), 한국어업기술학회
- Principles of Naval Architects (Second Revision), Volume II, "Lewis, E. V.", The Society of Naval Architects and Marine Engineers, 7~15 (1988)
- Theoretical prediction of motions of high-speed planing boats in waves, "Martin, M.", David W. Taylor Naval Ship Research and Development Center, ~, pp.DTNSRDC Report 76-0069 (1976)
- Savitsky, D., "Procedures for hydrodynamic evaluation of planing hulls in smooth and rough water", Marine Technology, 13(4), pp.381~400 (1976)