• Title/Summary/Keyword: 활주선형

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A Study on Improvement in the Resistance Performance of Planing hulls by Hull Shape Optimization (고속활주선의 선형 최적화를 통한 저항성능 개선에 관한 연구)

  • Kim, Sunbum
    • Journal of the Korea Society for Simulation
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    • v.27 no.2
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    • pp.83-90
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    • 2018
  • This paper describes the method of hull shape optimization to improve the resistance performance of planing hulls when a reference hull shape and its principal dimensions are given. First, the planing hull of precedent research is adopted as the reference hull and an optimization problem is formulated by defining hull shape parameters. The search space of this research is discretized for computing cost and DPSO(Discrete binary version of Particle Swarm Optimization) method is used to solve the optimization problem. As the result of optimization, the decrease of resistance is confirmed from the comparison between the reference hull's and the modified hull's planing performance from computational results.

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.

A Study on the Resistance Characteristics for Planing Craft with Air Injection at the Bottom (선저 공기공급에 따른 활주형선의 저항특성 연구)

  • Park, Chung-Hwan
    • Journal of Navigation and Port Research
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    • v.36 no.3
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    • pp.157-162
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    • 2012
  • A planing craft is designed specifically to achieve comparatively high speed on the surface of the water. The frictional resistance of planing craft can be reduced further by injecting air to the craft's bottom. In this paper, the resistance characteristics of high speed planing crafts with & without air injection at the bottom were compared by sea model-test method. As a result, we conformed that planing craft with air injection has much greater the effect of resistance reduction.

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 $3.0{\sim}5.0%$.

실 해상모형시험을 이용한 선미 보조동체 장착 Stepped hull 선형의 횡동요 및 저항특성 비교 연구

  • Jo, Hyo-Je;Son, Gyeong-Ho;Park, Chung-Hwan
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2007.12a
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    • pp.37-39
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    • 2007
  • 고속 활주형선의 선형시험 ${\cdot}$ 검증을 위하여 설 해상모형시험기법을 정립하였으며, 본 시험법을 이용하여 선미 보조동체 장착 유무에 따른 고속 Stepped Hull 선형의 횡동요 및 저항특성을 비교, 분석하였다.

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A study on the Effect of Section Shape and L/B ratio on the Performance of Planing Hull Type High Speed Fishing Vessel (활주선형 고속어선의 단면형상 및 장-폭비와 성능과의 관계에 대한 연구)

  • Lee, Kwi-Joo;Lee, Kwang-Il
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.34 no.3
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    • pp.283-286
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    • 1998
  • For the systematic study on the resistance characteristics of the planing hull, the experimental studies on the correlation between geometrical characteristics of the subject hull forms and their hydrodynamic characteristics are carried out. This study is the first stage to develop the advanced planing hull type fishing boat and involves the followings; -Resistance characteristics for typical four different section types, -Resistance characteristics for different length-beam ratio

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A Prediction on Running Attitude of High Speed Planing Craft (고속 활주선의 항주자세 추정)

  • Oh, Kwang-Ho;Yoo, Jae-Hoon
    • Journal of Korea Ship Safrty Technology Authority
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    • s.33
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    • pp.12-31
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    • 2012
  • 수치 계산으로 고속 활주선의 저항 성능을 평가하기 위해서는 활주 상태에서의 항주자세 예측이 무엇보다도 중요하다고 할 수 있다. 항주자세의 변화가 큰 고속 활주선의 경우에는 활주 자세에 따라 선저 바닥면에서 나타나는 압력 변화에 의한 동적 부양력 변화가 크므로 단순히 정지 중 흘수를 기준으로 계산되어진 유체력으로 항주자세를 예측하기 보다는 자세 변화에 따른 동적 부양력의 변화와 이에 의한 자세 변화를 반복 계산을 통해 수렴시키는 것이 요구되어진다. 본 연구에서는 선형화된 자유수면 조건의 포텐셜 수치 계산으로 유체 동압력인 부양력을 계산해내고 이를 유체 정역학적 힘으로 간주하여 부력과 선체중량과의 힘과 트림 모멘트 평형 관계를 만족시키는 방법으로 반복적인 계산을 통해 수렴된 활주 자세를 얻어내었다.

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A Review on the Performance Test of a High-Speed Planing Hull with 35 knot Speed by Appling the Streamlined Step of Hull Form (유선형 스텝 선형을 적용한 35 knot급 고속활주선의 성능평가에 대한 고찰)

  • Moon, Byung Young;Go, Ho Nam;Lee, Ki Yeol
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.30 no.3
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    • pp.95-102
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    • 2018
  • As a recent technical approach, a high-speed planing hull was tried to realize a friction reducing system by simultaneously actuating the triple streamlined step hull form in association with optimum speed of 35 knot planing for fishing boat. In this approach, the streamlined step hull form with triple structure of type was attached under the bottom of high-speed planing hull, while a friction resistance is reduced in the process of running at the speed of 35 knot. In addition, this research was to make a performance test as to the manufactured product and acquire the purposed values and the development items. Actually, after manufacturing the desired prototype of high-speed planing hull, the significant items, fuel efficiency (second) and amount of fuel consumption (degree) including maximum speed (knot) were estimated for a performance test. And tensile strength (MPa) and bend strength (MPa) as to the completed prototype like a high speed planing hull were also acquired during the test.