• Title/Summary/Keyword: Power boat

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Analysis and Modeling of Fishing Boat's Power Network for using Renewable Energy Source (신재생 에너지원 활용을 위한 어선 전력계통 분석 및 모델링)

  • Lee, Sang-Jung;Lee, Dong-Gil;Jung, Jee-Hoon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.2
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    • pp.182-189
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    • 2016
  • A modeling method of electric power network inside a fishing boat less than 5 tons is proposed for its high-energy efficiency with renewable energy sources. The power network inside the fishing boat consists of a diesel engine, a starter motor, an alternator, battery packs, and electric loads, which are connected in parallel. To obtain proper power network model, the voltage -current characteristics of the electric components are considered to develop elaborate electrical models under several load conditions. Measured data of the battery and alternator current include noise. By using an average method, the AC components from the power network of the fishing boat can be reduced, which is verified by KCL rule. Using the proposed power network model, the power generation of the alternator and the reduction of diesel consumption in the boat's engine are predictable under various operating conditions. The validity of the proposed methodology is verified by comparing simulation results with experimental measurements using statistical inferences.

Structural Strength Assessment and Optimization for 20 Feet Class Power Boat (20피트급 파워보트의 구조강도 평가 및 최적화)

  • Yum, Jae-Seon;Yoo, Jaehoon
    • Journal of the Society of Naval Architects of Korea
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    • v.53 no.2
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    • pp.108-114
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    • 2016
  • Recently, there has been a growing interest in marine leisure sports and high speed power boat for fishing. The prototype of 20 feet class power boat was developed and authors are joined in this government-led project. The research was performed to evaluate the optimal structure and design of the structural strength necessary to ensure the structural safety of the power boat. A new material ROCICORE fiber added to the mat and roving was adopted for high-power tenacity. ANSYS Workbench has been used to make the structural model, evaluate the strength and optimize the structural design. The response of the structure to quasi-static slamming loads according to the rules and regulations of ISO 12215-5, Lloyd’s Register of Shipping and Korean Register has been implemented and studied. An optimization study for the structural response is carried out by changing the plate thickness and section modulus of stiffeners. The power boat structure derived fuel efficiency is optimized by performing the best possible structural design to minimize the hull weight.

A Study on The Parametric Design Method for Power Boat (파라메트릭 설계법에 의한 파워보트 설계를 위한 연구)

  • Jeong, Yo-Han;Yoo, Jae-Hoon
    • Journal of the Society of Naval Architects of Korea
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    • v.49 no.2
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    • pp.182-188
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    • 2012
  • The hull form design technique for high speed power boat based on the parametric design method is presented in this paper. While the design methods of conventional vessels that are currently in use have been well developed in various aspects from existing database. However, an easy and simple design program for high speed power boats needs to be provided for the relatively small boat builders who are in lack of experience and skilled manpower. This paper presents a parametric design technique which is aimed to provide an easier creation of a new model by inputting several parameters, such as angles and lengths, which correlate with hydrodynamics characteristic for high speed boats. The paper also introduces the prototype program developed to design power boat with parametric design technique.

A Study on Hull Form Development of Polyethylene Boat (폴리에틸렌 보트의 선형 개발에 관한 연구)

  • Cho, Seok-Swoo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.14 no.10
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    • pp.4726-4732
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    • 2013
  • The Domestic boat has been manufactured by hull form of typical foreign boat. In this study, design environment for polyethylene boat is analysed to create new hull form of the boat and design elements are extracted from existing boats and consumer preferences. Key elements in polyethylene boat design are three words "semi-classic, urban and sporty". Hull resistance and engine power for new developed boat can be expected by Orca 3D program. This result indicates that engine power of the boat is much less than that of commercial boat.

Study on Catamaran Type Solar Boat Using the Pod Propulsion System (포드형 추진시스템을 이용한 카타마란형 솔라보트에 관한 연구)

  • Kim, Myoung-Jun;Chea, Gyu-Hoon
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.17 no.2
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    • pp.161-166
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    • 2011
  • In this study, design of hull and test of model boat were carried out with electric propulsion small boat driven by photo-voltaic energy. The shape of boat was made with catamaran type by considering the ship's stability, the light-receiving area from solar. According to calculation, when speed of model boat is 5 knots, it was estimated the available power for propulsion with 1.1[hp]. However, the natural energy such as solar energy is strictly dependent upon the climate conditions so the real boat speed is slightly lower than the estimated value.

A Study on the Hybrid Propulsion System for Fishing Boat (어선용 하이브리드 추진시스템에 관한 연구)

  • Oh, Jin-Seok;Jo, Kwan-Jun;Park, Choung-Hwan;Ham, Youn-Jae;Kwak, Jun-Ho;Lee, Ji-Young
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.5
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    • pp.677-683
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    • 2008
  • The electric propulsion system us closely related with the economical efficiency of ship operation. Fuel efficiency is mainly decided by propulsion system such as diesel engine, propulsion motor and steam turbine. The hybrid propulsion system for fishing boat consists of diesel engine and battery as propulsion power source. This paper is to design battery capacity according to power consumption with ship operation condition, and to test the power consumption of model ship in the circulating water channel. As a result. it can be known that the optimum ship operation condition affects the fuel efficiency.

Development of a 25kW-Class PEM Fuel Cell System for the Propulsion of a Leisure Boat (선박 추진용 25kW급 고분자전해질 연료전지 시스템 개발)

  • Han, In-Su;Jeong, Jeehoon;Kho, Back-Kyun;Choi, Choeng Hoon;Yu, Sungju;Shin, Hyun Khil
    • Transactions of the Korean hydrogen and new energy society
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    • v.25 no.3
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    • pp.271-279
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    • 2014
  • A 25kW-class polymer electrolyte membrane (PEM) fuel cell system has been developed for the propulsion of a leisure boat. The fuel cell system was designed to satisfy various performance requirements, such as resistance to shock, stability under rolling and pitching oscillations, and durability under salinity condition, for its marine applications. Then, the major components including a 30kW-class PEM fuel cell stack, a DC-DC converter, a seawater cooling system, secondary battery packs, and balance of plants were developed for the fuel cell system. The PEM fuel cell stack employs a unique design structure called an anodic cascade-type stack design in which the anodic cells are divided into several blocks to maximize the fuel utilization without hydrogen recirculation devices. The performance evaluation results showed that the stack generated a maximum power of 31.0kW while maintaining a higher fuel utilization of 99.5% and an electrical efficiency of 56.1%. Combining the 30-kW stack with other components, the 25kW-class fuel cell system boat was fabricated for a leisure. As a result of testing, the fuel cell system reached an electrical efficiency of 48.0% at the maximum power of 25.6kW with stable operability. In the near future, two PEM fuel cell systems will be installed in a 20-m long leisure boat to supply electrical power up to 50kW for propelling the boat and for powering the auxiliary equipments.

Evaporation Characteristics of Aluminum by Using Surface-treated Graphite Boat (표면처리된 흑연 보트를 이용한 알루미늄의 증발 특성)

  • Jeong, J.I.;Yang, J.H.
    • Journal of the Korean institute of surface engineering
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    • v.42 no.1
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    • pp.1-7
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    • 2009
  • Resistive heating sources are widely used to prepare thin films by vapor deposition because they are cheap, and easy to install and handle in vacuum system. Graphite is one of materials used to make the resistive heating source, but until now only limited applications have been possible as it reacts easily with evaporating materials at high temperature. In this study, evaporation characteristics of aluminum have been investigated by using graphite boat thermally treated with BN powder. The employed graphite boat has been prepared by spray-coating BN power onto the cavity surface of the boat and thermal treatment with aluminum in vacuum at the temperature of more than $1400^{\circ}C$. The voltage-current characteristics as well as resistivity changes of the graphite boat have been investigated during aluminum evaporation according to the applied voltage and time. The evaporation aspect has been picturized during flash evaporation for 40 seconds based on the characterization results. The evaporation rate of the graphite boat has been compared with that of BN boat. The graphite boat showed some different characteristics compared with BN boat, in that the evaporation occurred at the last stage of flash evaporation. The film appearance according to the applied voltage has been compared, and also the reflectance of the resulting film has been investigated according to the film thickness. It has been found that the graphite boat thermally treated with BN powder can be used for aluminum evaporation without problem.

A Study on the Characteristic of Motion and Resistance Performance from the Body Plan of Planning Leisure boat at low speed (저속시 활주형 레저보트의 단면형상에 따른 저항·내항성능 특성연구)

  • Park, C.H.;An, N.H.;Jang, H.Y.;Kwon, Y.W.
    • Journal of Power System Engineering
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    • v.16 no.4
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    • pp.17-23
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    • 2012
  • In this study, the numerical simulation and basin model test have been performed to evaluate sea worthiness and resistance performance for a small pre-planning three type of leisure boats which are U, V, Y shapes of hull forms. As a well known commercial CFD code, Maxsurf, was applied for modeling hull forms used as the solver of motion analysis. Also the model resistance test was carried out to estimate the effective power of boat in the basin tank. Numerical simulation and model test results show that Y-shaped hull is better than the other types in terms of heave and pitch motion, having a key effect on a boat sea worthiness. But V-type hull is more efficiency than others cases in resistance performance.

Design of Power Transmission System of a Water Bike (수상 자전거의 동력전달장치 설계)

  • Choi, Jung-Kyu;Kim, Hyoung-Tae
    • Journal of the Society of Naval Architects of Korea
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    • v.50 no.3
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    • pp.153-159
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    • 2013
  • The power transmission system has always been considered critical for a human powered boat(or water bike) since it first showed up at Human Powered Vessel Festival. Mechanical problems, such as abrasions and other damages of the gear system for the power transmission, lead to poor durability and low efficiency of a boat. This paper described mechanical problems and a design process of power transmission system and then suggested the method to solve the problems. It is selected a module and a type of gears that are structurally stable thus can transmit the power durable. Especially the lower gear box is applied to CRP(contra rotating propeller) system for improving the structural stability and the propeller efficiency as well. As the results, the upper and lower gear box are designed and manufactured. And from the trial test, it is confirmed that the power transmission system is reliable.