• Title/Summary/Keyword: High-Speed Craft

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A Study on the Resistance Property of Hard Chine Type High Speed Planing Craft (HARD CHINE형 활주 고속선의 저항특성에 관한 고찰)

  • 이창억
    • Journal of the Korean Professional Engineers Association
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    • v.16 no.2
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    • pp.1-11
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    • 1983
  • The resistance property of a high speed passenger craft (: "DOL-PIN HO" designed by the author in 1972) is investigated as follows; -. The Resistance property of the craft is determined by savitsky′s method and blount-Fox′s method. The theoretical results are also compared with the full scale data. The comparison reveals that the result when using blount/fox′s method are in much closer agreement with the full scale data than savitsky′s. -. The effects of ship speed on the positions of the center of pressure and of the longitudinal center of gravity (L.C.G.) are investigated. The investigation shows that the position of L.C.G. of the craft is almost constant although the ship speed is changed. -. The effect of transom flap on the Resistance property of the craft is studied using savitsky/brown′s method. From the study it is found that the resistance of the craft is decreased and hence speed gain (about 3% of the service speed) can be obtained, when using transom flap for the craft.

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A Study on the Bow Collapse of High-Speed Passenger Craft in Collision with Bridge Pier (고속 여객선의 교각 충돌에 대한 연구)

  • 신영식;박명규
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.5 no.1
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    • pp.1-8
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    • 1999
  • During the last 10 years, the various type of high speed craft have been greatly developed, and since around of 1990 the large size of high speed passenger and/or cargo vessels are also introduced and took into the service in the various routes over the world. In a marine traffic way some bridge need to build across a rivers, cannals or a waterways. This one will be an obstruction and potential risk of collision in the way of high speed craft. Accordingly some of collision accident have been reported, which were caused by a lost control, wind and hydrodynamic forces, fog or human errors. In this paper a high speed craft having 40 m length is assumed to be collided with a circular type of bridge piers at right angle. The mode of deformation, penetration depth of collapse, impact forces, reduction of speed, loss of kinetic energy, and influence of scantlings, etc. have been calculated in each speed with a time variation to find a maximum values within a limit, and are graphically presented.

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An Experimental Study on the Motion Response of a High-Speed Planing Craft in Regular Head Waves (정면 규칙파 중 활주형 고속선의 운동 응답에 대한 실험적 연구)

  • Kim, Dong-Jin;Rhee, Key-Pyo;Hwang, Seung-Hyun;Park, Han-Sol
    • Journal of the Society of Naval Architects of Korea
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    • v.46 no.4
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    • pp.373-381
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    • 2009
  • The running attitude of a high-speed planing craft may change significantly depending on its speed in seaway. Other variables that may influence its running attitude are its weight, center of gravity, sea conditions, and so on. In this paper, planing craft model tests were carried out with respect to above variables in SNU towing tank, and vertical motion responses of a planing craft in regular head waves were analyzed. The experimental results in regular waves were compared with those in calm water, and compared with the theoretical estimations. Finally, the effects of running speeds of a planing craft on its motion amplitudes are confirmed.

Feasibility Study on High Speed Craft Considering Environment in South Korea (우리나라 운항환경을 고려한 소형 고속정의 타당성 분석)

  • Lee, Soon-Sup;Kang, Dong-Hoon;Shin, Sung-Chul
    • Journal of Ocean Engineering and Technology
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    • v.25 no.2
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    • pp.113-119
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    • 2011
  • The Korea navy has a vital national interest in maritime security. The national strategy for maritime security focuses on preventing terrorism, crime, and hostile acts in the maritime domain. This requires the development of high speed crafts for maritime security in the South Korea domain. This paper reviews the state of the art on the development of high speed craft internationally, including efforts by the U.S. navy, and analyses the riverine environment to operate high speed crafts in South Korea. This paper makes specific proposals for high speed craft such as their main dimensions, speed, endurance, hull structure material, propulsion system, and general arrangement and 3D shape. This paper was used in the generation of basic resources for future ROC (requirement of capability) of high speed crafts using an engineering methodology.

A Study on the Resistance Characteristics of a Stepped Planing Hull Using a High-Speed Towing System (고속 예인시스템을 이용한 단을 가진 활주형선의 저항특성 고찰)

  • Shin, Jeong-Il;Yang, Ji-Man;Park, Ho-Won;Kim, Jae-Sung;Kim, Hyo-Chul
    • Journal of the Society of Naval Architects of Korea
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    • v.42 no.4 s.142
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    • pp.341-349
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    • 2005
  • With increasing demands of high speed transportation, recently a lot of high speed marine vehicles, such as SWATH, semi-planing craft, planing craft, hydrofoil craft, SES and so on, have been paid attention especially in high speed region over the Froude number 0.5. The resistance characteristics of the vehicles should be experimentally evaluated in the towing tank. At the Seoul National University, a light-weight cantilever type towing carriage was devised and installed in the towing tank. Wireless measurement devices were also provided for appropriate data acquisition during high-speed towing tests. With the new carriage system, a series of model tests were performed to investigate the hydrodynamic characteristics of a stepped planning hull in the towing tank and the resistance performances of the hull are introduced in this report.

Comparisons of Resistance Characteristics of the High-speed Planing Craft with Respect to the Number of Bottom Steps (선저 스텝개수에 따른 고속 활주형선의 저항특성 비교)

  • Park, Chung-Hwan
    • Journal of Navigation and Port Research
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    • v.32 no.8
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    • pp.583-588
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    • 2008
  • The planing craft is designed specifically to achieve comparatively high speed on the surface of the water. In general, the stepped hull craft has effect improvement in speed and fuel-efficiency because of the reduction of total resistance by a small wetted surface area without corresponding stepped hull craft. In this paper, the high speed stepped hull crafts with respect to the number of bottom steps were performed to compare the effect of resistance performance using at-sea model-test method. In conclusion, the stepped hull craft with twin-step was proved to be effective to reduce the total resistance.

An Experimental Study on the Vertical Motion of a High-Speed Planing Craft in Regular Following Waves (선미 규칙파 중 고속 활주선의 연직면 운동에 대한 실험적 연구)

  • Kim, Dong-Jin;Rhee, Key-Pyo;You, Young-Jun;Park, Han-Sol
    • Journal of the Society of Naval Architects of Korea
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    • v.47 no.4
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    • pp.496-507
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    • 2010
  • It is well known that when a high-speed planing craft travels in following seas it experiences long-periodic motions due to low encounter frequency, and it often loses its course keeping stability. Therefore, it is necessary to study the sea-keeping performance and stability of it in the following seas. In this paper, the vertical motions of a planing craft were measured in following regular waves, and the test results were compared with the theoretical results. In the case of the same encounter frequency, non-dimensionalized motion amplitudes become larger as Froude number is higher, and non-dimensionalized motion amplitudes in head waves are larger than those in following waves. The mean values of the motions in following waves are similar to the running attitudes of a craft in calm water at the same Froude number.

A Study on the Initial Hull Form Development and Resistance Performance of a 45 Knots Class High-Speed Craft (45노트급 고속정의 초기선형 개발과 저항성능에 관한 연구)

  • KIM JU-NAM;JEONG UH-CHEUL;PARK JE-WOONG;KIM DO-JUNG
    • Journal of Ocean Engineering and Technology
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    • v.20 no.1 s.68
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    • pp.32-36
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    • 2006
  • The initial hull form of a 100 tan, 45 knot class high-speed craft is newly developed. The resistance performances are investigated using a model test at high speed in a circulating water channel. The effect of the initial trim is studied together. Wave patterns are observed to clarify the relationship between the resistance performance and the wave characteristics. It can be found that the initial trim plays a role in increasing the resistance performance above a certain velocity.

Unmanned WIG (U-WIG) Craft Design and Performance Test (무인 위그선 설계 및 성능시험)

  • Ahn, Byoung-Kwon;Jang, Jung;Song, Kwan-Hyung
    • Journal of the Society of Naval Architects of Korea
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    • v.45 no.4
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    • pp.396-402
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    • 2008
  • As demands for high speed sea transportations have recently been increased, various high speed ships appear. Among them the WIG is believed to be one of the next generation of the sea transportation system. Test flight of the 20 seaters WIG craft, Haenarae-X1, developed by MOERI was a success in August, 2007. Development of the large WIG is now ongoing, and it is expected to be commercialized in the near future. In this study we designed a remote controled WIG Craft and carried out its performance test in order to establish engineering design procedures of an Unmanned WIG (U-WIG) craft.

A study on Resistance Performance of the High-speed Planing Craft with Spray Strip (Spray Strip부착에 따른 고속 활주형선 저항특성 연구)

  • Park, Chung-Hwan
    • Journal of Navigation and Port Research
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    • v.32 no.10
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    • pp.759-764
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    • 2008
  • The planing craft is designed specifically to achieve comparatively high speed on the surface of the water. Most of planing crafts have installed the spray strip in decreasing of wave impaction and improving motion performance of rolling and pitching et al. It is known to reduce the spray and frictional resistance by the effect of lift and improvement of wave profile in high speed. In this paper, the high speed planing crafts with & without spray strip in bottom were performed to compare the resistance performance by model-test. In conclusion, the high speed planing crafts with spray strip in bottom was proved to effect of the resistance decrement of $3.0{\sim}5.0%$.