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T : 목차정보

한국마린엔지니어링학회지 = Journal of the Korean Society of Ma... 12건

  1. [국내논문]   A Study on the Monitoring System for Engine Control by Measuring Combustion Pressure Continuously in All Cylinders  

    Miharat Yoshinori (Kobe University/Oshima National College of Maritime Technology ) , Maruyama Yasuo (Shoyo Engineering Co..LTD ) , Okada Yutaka (Shoyo Engineering Co..LTD ) , Kido Hachiro (Marine Technical College ) , Nishida Osami (Kobe Univeristy ) , Fujita Hirotsugu (Kobe Univeristy ) , Ito Masakazu (Oshima National College of Maritime Technology)
    한국마린엔지니어링학회지 = Journal of the Korean Society of Marine Engineering v.29 no.7 ,pp. 713 - 721 , 2005 , 2234-7925 ,

    초록

    A marine diesel engine should realize optimal operation efficiency while reducing NOx, PM (Particulate Matters) and other emissions. Fuel injection systems that use electronic control can become an effective means of achieving that objective. However. it still needs some accurate and instant information in order to bring its ability into full potential while sailing on the sea. The important information of them are a shaft torque and continuous combustion pressures of all cylinders. The shaft torque and the propeller thrust described in this paper are measured at an intermediate shaft by using a unique principle that one of two electromagnet coils oscillates a vibrating strip which the length changes with force and the other coil picks up the change of the frequency of the vibrating strip. For further reference, the shaft power meter multiplied the torque by the shaft revolution has already had about 750 sets of sales performance. The research presented in this paper started about ten years ago and is concerned with the development of a combustion pressure sensor that uses the same principle. Recently, the pressure sensor which bears continuous operation has been developed after a hard struggle, that is, the system that consists of a shaft horsepower meter, a propeller thrust meter and a combustion pressure sensor has been completed and has been shown to be reliable. This paper describes the configuration of this system, the material of the combustion pressure sensor, the principle of that, and the improving point of the sensor, and, we finally consider the use of this system.

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  2. [국내논문]   A Study on Emissions and Catalytic Conversion Efficiency Characteristics of an Electronic Control Engine Using Ethanol Blended Gasoline as Fuels  

    Cho Haeng-Muk (Div. of Automotive & Mechanical Engineering, Kongju Univ.)
    한국마린엔지니어링학회지 = Journal of the Korean Society of Marine Engineering v.29 no.7 ,pp. 722 - 728 , 2005 , 2234-7925 ,

    초록

    In this paper, the effects of ethanol blended gasoline on emissions and their catalytic conversion efficiency characteristics were investigated in a multiple-point EFI gasoline engine, The results show that with the increase of ethanol concentration in the blended fuels, THC emissions were drastically reduced by up to thirty percent, And brake specific fuel consumption was increased, but brake specific energy consumption could be improved. However, unburned ethanol and acetaldehyde emissions increased. Pt/Rh based three-way catalysts were effective to reduce acetaldehyde emissions, but had low catalytic conversion efficiency for unburned ethanol. The effect of ethanol on CO and NOx emissions and their catalytic conversion efficiency had close relation to the engine's speed, load and air/fuel ratio. Furthermore fuels blended with thirty percent ethanol by volume could dramatically reduced THC CO and NOx emissions at idle speed.

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  3. [국내논문]   Mass and Heat Transfer Characteristics of Vertical Flat Plate with Free Convection   피인용횟수: 1

    Kim Myoung- Jun (Kunsan National University)
    한국마린엔지니어링학회지 = Journal of the Korean Society of Marine Engineering v.29 no.7 ,pp. 729 - 735 , 2005 , 2234-7925 ,

    초록

    This paper has dealt with the characteristics of mass and heat transfer of vertical flat plate with free convection. The theory of similarity transformations applied to the momentum and energy equations for free convection. To derive the similarity equation of mass transfer. the equation for conservation of species was added to the continuity. momentum and energy equations. The momentum, energy and species equations set numerically to obtain the velocity, temperature and mass fraction of species as dimensionless. For cases where momentum transport dominates, the thermal boundary layers are shorter than the momentum boundary layer. The relationships between momentum, energy and species were clarified from this study.

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  4. [국내논문]   Analysis of Ventilation Performance Using a Model Chamber   피인용횟수: 1

    Kang Tae-Wook (LG Electronics Inc. ) , Chang Tae-Hyeon (Kyeongnam University)
    한국마린엔지니어링학회지 = Journal of the Korean Society of Marine Engineering v.29 no.7 ,pp. 736 - 743 , 2005 , 2234-7925 ,

    초록

    In this study, three different types of mechanical ventilation systems are compared based on their ventilation characteristics: tracer gas concentration decay characteristics, and ventilation effectiveness by calculating actual ventilation air flow rate. The experiments are performed by using a step-down method for measuring tracer gas. $CO_{2}$ gas, concentration in the model chamber. Application of a mixing factor, k, was used and measured values ranged from 0.68 to 0.77. The Type 2 ventilation system was found to have the highest ventilation effectiveness rather than the Types 1 and 3.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  5. [국내논문]   Performance Improvement of Power Control System for Driving MGT  

    Lee Sung-Geun (Division of Electrical and Electronics Engineering, Korea Maritime University)
    한국마린엔지니어링학회지 = Journal of the Korean Society of Marine Engineering v.29 no.7 ,pp. 744 - 749 , 2005 , 2234-7925 ,

    초록

    This paper describes the performance improvement of power control system of magnetron (MGT) for microwave oven. The MGT is used extensively in household microwave oven and industrial microwave heating devices, and is operated by 3.0[kV] $\∼$ 5.0[kV] dc high voltage. The proposed power supply is consisted of a bridge rectifier, step-up converter(SUC) and its controller, half bridge inverter(HBI) and its controller, and full wave double voltage rectifier(DVR). In the proposed system, a good power factor can be obtained by the SUC' switching method that the inductor current waveforms follows that of the rectified voltage, and a line input power can be controlled to a range of 17.5[ $\%$ ] by duty ratio (DR) adjustment of the HBI.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  6. [국내논문]   A Numerical Study on the Effect of Inlet Guide Vane Angle on the Performance of Francis Hydraulic Turbine  

    Kim Chul-Ho (Department of Automotive Engineering, Seoul National University of Technology)
    한국마린엔지니어링학회지 = Journal of the Korean Society of Marine Engineering v.29 no.7 ,pp. 750 - 757 , 2005 , 2234-7925 ,

    초록

    The objective of this study is an understanding of the effect of inlet flow angle on the output power performance of a Francis hydraulic turbine, An optimum induced angle at the inlet of the turbine is one of the most important design parameters to have the best performance of the turbine at a given operating condition, In general. rotating speed of the turbine is varied with the change of water mass flowrate in a volute, The induced angle of the inlet water should be properly adjusted to the operating condition to have maximum energy conversion efficiency of the turbine, In this study. a numerical simulation was conducted to have detail understanding of the flow phenomenon in the flow path and output power of the model Francis turbine. The indicated power produced by the model turbine at a given operating condition was found numerically and compared to the brake power of the turbine measured by experiment at KIER. From comparison of two results, turbine efficiency or energy conversion efficiency of the model turbine was estimated. From the study, it was found that the rotating power of the turbine linearly increased with the rotating speed. It means that the higher volume flow rate supplied. the bigger torque on the turbine shaft generated. The maximum brake efficiency of the turbine is around 46 $\%$ at 35 degree of induced angle. The difference between numerical and experimental output of the model turbine is defined as mechanical efficiency. The maximum mechanical efficiency of the turbine is around 93 $\%$ at 25 $\∼$ 30 degree of induced angle.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  7. [국내논문]   Driving of the Ball Screw Actuator Using a Global Sliding Mode Control with Bounded Inputs  

    Choi Hyeung-Sik (Under water Vehicle Research Center, Korea Maritime University ) , Son Joung-Ho (Mechanical and Information Engineering, Korea Maritime University)
    한국마린엔지니어링학회지 = Journal of the Korean Society of Marine Engineering v.29 no.7 ,pp. 758 - 768 , 2005 , 2234-7925 ,

    초록

    The ball screw actuated by the electric motor is widely used as an essential actuator for driving the mechanical system by virtue of accuracy and force transmission capability. In this paper, a design of the global sliding mode control is presented to drive the ball screw actuator along the minimum time trajectory, In the proposed control scheme, if the ranges of parametric uncertainties and torque limits of the system are specified, the arrival time of the load along the minimum time trajectory can be estimated. Also, the arriving time at the reference input and the maximum acceleration are expressed in a closed form solution. Conversely, the capacity of a ball screw actuator including the motor can be easily designed if the external load and its transportation time are specified. The superior performance of the proposed control scheme and analysis is validated by the computer simulation and experiments comparing with other sliding mode controllers.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  8. [국내논문]   Numerical Analysis of Unsteady Viscous Flow Through a Weis-Fogh Type Ship Propulsion Mechanism Using the Advanced Vortex Method  

    Ro Ki-Deok (School of Mechanical and Aerospace Engineering, Institute of Marine Industry Gyeongsang Ntional University ) , Kang Myeong-Hun (Graduate School, Department of Mechanical System Engineering, Gyeongsang National University ) , Kong Tae-Hee (Graduate School, Department of Mechanical System Engineering, Gyeongsang National University)
    한국마린엔지니어링학회지 = Journal of the Korean Society of Marine Engineering v.29 no.7 ,pp. 769 - 778 , 2005 , 2234-7925 ,

    초록

    The velocity and pressure fields of a ship's Weis-Fogh type propulsion mechanism are studied in this paper using an advanced vortex method. The wing (NACA0010 airfoil) and channel are approximated by source and vortex panels. and free vortices are introduced away from the body surfaces. The viscous diffusion of fluid is represented using the core-spreading model to the discrete vortices. The velocity is calculated on the basis of the generalized Biot-Savart law and the pressure field is calculated from an integral, based on the instantaneous velocity and vorticity distributions in the flow field. Two-dimensional unsteady viscous flow calculations of this propulsion mechanism are shown. and the calculated results agree qualitatively with the measured thrust and drag due to un-modeled large fluctuations in the measured data.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  9. [국내논문]   Laminar Convective Heat Transfer from a Horizontal Flat Plate of Phase Change Material Slurry Flow   피인용횟수: 1

    Kim Myoung-Jun (Kunsan National University)
    한국마린엔지니어링학회지 = Journal of the Korean Society of Marine Engineering v.29 no.7 ,pp. 779 - 784 , 2005 , 2234-7925 ,

    초록

    This paper presents the theory of similarity transformations applied to the momentum and energy equations for laminar, forced, external boundary layer flow over a horizontal flat plate which leads to a set of non-linear, ordinary differential equations of phase change material slurry(PCM Slurry). The momentum and energy equation set numerically to obtain the non-dimensional velocity and temperature profiles in a laminar boundary layer are solved. The heat transfer characteristics of PCM slurry was numerically investigated with similar method. It is clarified that the similar solution method of Newtonian fluid can be used reasonably this type of PCM slurry which has low concentration. The data of local wall heat flux and convective heat transfer coefficient of PCM slurry are higher than those of water more than 150 $\~$ 200 $\%$ , approximately.

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  10. [국내논문]   A Study on Hull Deflection and Shaft Alignment Interaction in VLCC   피인용횟수: 1

    Lee Yong-Jin (The American Bureau of Shipping(ABS) ) , Kim Ue-Kan (Korea Maritime University)
    한국마린엔지니어링학회지 = Journal of the Korean Society of Marine Engineering v.29 no.7 ,pp. 785 - 794 , 2005 , 2234-7925 ,

    초록

    Modern ship hulls of large oil carriers and container carrers have become more flexible with scantling optimization and increase in ship length. On the other hand. as the demand for power has increased with the ship size. shaft diameters have become larger and stiffer. Consequently. the alignment of the propulsion system has become more sensitive to hull girder deflections. resulting in difficulties in analyzing the alignment and conducting the alignment procedure. Accordingly. the frequency of shaft alignment related bearing damages has increased significantly in recent years. The alignment related damages are mostly attributed to inadequate analyses. changes in the design of the vessel. shipyards' practices in conducting the alignment. and a lack of well defined analytical criteria. The hull deflections should be considered at the design stage to minimize the bearing damage caused by hull deflection. Hull deflections can be estimated by analytical approach and reverse calculation using the measured data. The hull girder deflection analysis using the reverse calculation will be introduced in this paper.

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