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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Marine Engineering
Journal Basic Information
Journal DOI :
Korean Society of Marine Engineers
Editor in Chief :
Volume & Issues
Volume 35, Issue 8 - Nov 2011
Volume 35, Issue 7 - Nov 2011
Volume 35, Issue 6 - Sep 2011
Volume 35, Issue 5 - Jul 2011
Volume 35, Issue 4 - May 2011
Volume 35, Issue 3 - May 2011
Volume 35, Issue 2 - Mar 2011
Volume 35, Issue 1 - Jan 2011
Selecting the target year
Study on Solar Air Collector with Perforated Endothermic Panel(Experimental and Numerical Study)
Kim, Myoung-Jun ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 732~739
DOI : 10.5916/jkosme.2011.35.6.732
In recent years, the crisis of energy is growing seriously and also the contamination of ecology has been reverberated as international problem. The social concerns on energy crisis have been growing for the last several years and also the interests in new and renewable energy have been increased. Therefore, in order to solving these problems, this study has dealt with the solar air collector with perforated endothermic panel to increase the indoor temperature. And also, the PV panel for running indoor air circulating fan has used to increase the convective heat transfer. This study is consisted with experiment and numerical parts. From this study, the experimently result is indicated that the inlet air temperature is increased up to 45[
]. This temperature is enough to heat the indoor air during winter season. And the numerical calculation results revealed that the mixing effect of convection is increased with increasing in fan circulating power.
Performance Analysis of Gasoline Fueled Marine Solid Oxide Fuel Cell System
Oh, Jin-Suk ; Lee, Kyung-Jin ; Kim, Sun-Hee ; Park, Sang-Kyun ; Kim, Mann-Eung ; Lim, Tae-Woo ; Kim, Jong-Su ; Oh, Sae-Jin ; Kim, Myoung-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 740~749
DOI : 10.5916/jkosme.2011.35.6.740
The strengthened regulations for atmospheric emissions from ships have caused a necessity of new, alternative power system in ships for the low pollutant emissions and the high energy efficiency. Recently, new kinds of propulsion power system such as fuel cell system, which use hydrogen as an energy source, have been sincerely considered. The purpose of this work is to predict the performance of gasoline fueled SOFC system and to analyze the influence of operating temperature, current density, S/C, and H2 utilization ratio. The results are compared with the methane fueled system. The results show that the cell voltage and
utilization ratio are major factors on the performance of system and the gasoline fueled SOFC system have lower efficiency than the methane fueled system.
Boiling Heat Transfer Characteristics of Deionized Water in Microchannel
Lim, Tae-Woo ; You, Sam-Sang ; Choi, Hyeung-Sik ; Kim, Dong-Hyuk ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 750~756
DOI : 10.5916/jkosme.2011.35.6.750
An experimental study was carried out to measure the heat transfer coefficient in flow boiling to deionized water in a microchannel having a hydraulic diameter of
. Tests were performed in the ranges of heat fluxes from 100 to 400 kW/
, vapor qualities from 0 to 0.2 and mass fluxes of 200, 400 and 600 kg/
. From the experimental results, it is found that the measured heat transfer coefficients is independent of mass flux and quality, and is somewhat dependent of heat flux. Measured data of heat transfer are compared to a few available correlations proposed for macroscale. The previous correlations for macroscale overpredicted the flow boiling heat transfer coefficient for the test conditions considered in this work.
Influence of Performance and Internal Flow of a Radial Inflow Turbine with Variation of Vane Nozzle Exit Angles
Mo, Jang-Oh ; Kim, You-Taek ; Oh, Cheol ; Lee, Young-Ho ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 757~764
DOI : 10.5916/jkosme.2011.35.6.757
In this study, we analysed the influence of the performance and inflow flow of a radial inflow turbine with the variation of vane nozzle exit angles for a 100kW class turbine applicable in the waste heat recovery system. For this, three-dimensional CFD analysis was performed using commercial code called ANSYS Fluent 12.1. As the vane nozzle exit angle was more increased the reattachment region near blades of the vane nozzle got smaller, and also the Mach number at vane nozzle exit was observed to be 1 due to the effect of the cross section reduction. Through this study, we expect that the analysed results will be used as the design material for the composition of the turbine optimal design parameters corresponding to the target output power.
A Study on Thermal Management of Stack Supply Gas of Solid Oxide Fuel Cell System for Ship Applications
Park, Sang-Kyun ; Kim, Mann-Eung ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 765~772
DOI : 10.5916/jkosme.2011.35.6.765
In this research, the fuel cell system model capable of generating codes in real time was developed to construct of a HIL (Hardware-In-the-Loop) for a SOFC-powered ship. Moreover, the effects of the distribution of the exhaust gas flow rates in a stack, the flow rates of fuels and temperature of air supplied on the temperature characteristics of fuels supplied to the cathode and the anode, the output power of the stack and system efficiency are examined to minimize the temperature difference between fuels supplied to the stack used in a 500kW SOFC system using methane as a fuel. As a result, the temperatures of fuels supplied to the cathode and the anode maintain at 830K when the opening factor of three-way valve located at outlet of turbine is 0.839. Also the process for optimization of methane flow rate considering the fuel cell stack and system efficiency is required to increase the temperatures of fuels supplied to the stack.
Performance Analysis on the Ejector System in Flue-gas Discharge Channel of Marine Incinerator
Yun, Sang-Kook ; Chang, Ho-Gil ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 773~778
DOI : 10.5916/jkosme.2011.35.6.773
The International Maritime Organization(IMO) could try to adopt more severe amendment to prevent any air pollution from various waste materials by marine incinerator. This study is to analyse the performance improvement through Ansys CFD about new invented system which has three flue-gas discharge channels and sub-ejector installed in the dischage channel in order to evacuate flue-gas well from the combustion chamber. The results showed that the discharge temperature of flue-gas was below the regulated value of IMO by the multi-channels, and the sub-ejector system installed in the discharge channel was highly effective one to improve the flue-gas discharge ability.
Study on the Modeling of the Intake and Exhaust Systems of an SI Engine Using GT-POWER
Kim, Jeong-Seok ; Yoon, Keon-Sik ; Woo, Seok-Keun ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 779~785
DOI : 10.5916/jkosme.2011.35.6.779
Prediction of the transient pressure variations and performance parameters has been carried out for an SI engine using one of commercial software, GT-POWER. Various models were applied for the calculation of properties of the plenum chamber, exhaust manifold and catalytic convertor which are very important components included in the intake and exhaust systems.
Characteristic of Vibration in Windturbine System
Kim, Jung-Su ; Lee, Hyoung-Woo ; Park, No-Gill ; Kim, Young-Duk ; Kim, Soo-Yum ; Lee, Dong-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 786~795
DOI : 10.5916/jkosme.2011.35.6.786
This paper described the characteristic of vibration in wind turbine system including gearbox housing, gear drive, blade, generator. Especially, in planetary gear set, planet gears are supported by flexible pin. So, in planet gear, to consider not only torsional movement but also lateral movement. And include housing movement, because wind turbine system is supported by mount. To find out the characteristic of vibration, take the excitation source and study campbell diagram in operating range. Results of campbell diagram, resonances are occurred at 81.2HZ, 104.7Hz by 2nd tooth passing frequency. And resonance are also occurred at 264.5HZ, 377Hz, 424.6Hz by 3th tooth passing frequency. From the result, take vibration reduced measures.
Analysis of Development Trend for the Integrated Power System of Naval Vessels to Perform the High-Power and Energy Mission Load Platform
Lee, Hyung-Min ; Cho, Byung-Jin ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 796~801
DOI : 10.5916/jkosme.2011.35.6.796
The objective of this work presented here was focused on analysis of development trend for the integrated power system of naval vessels to perform the high-power and energy mission load platform. These mission loads are affected by the high level of military technologies, digitalization of the ocean battlefield, high power sensor system for maximization of the ship survivability. All electric power including propulsion power for ship should be controlled by integrated single system in order to carry various high power density weapon system such as Electromagnetic Aircraft Launch System, Electromagnetic Rail Gun[feasible precision striking at long distance 200NM(370km) or over]. As the analyzing the present state of things, mechanical propulsion system is shifted into hybrid or fully electric propulsion systems to realize integrated power system at the developed countries. Such challenges include reduced dependency on foreign-supplied fossil fuel, increasing demand for installed ship power, controlling life-cycle costs.
A Study on the Weld Part Fracture Toughness of Austenite Type Stainless Steel for Cryogenic Liquid Nitrogen Storage Tank
Kim, Young-Deuk ; Choi, Dong-Jun ; Park, Hyung-Wook ; Cho, Jong-Rae ; Bae, Won-Byoung ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 802~808
DOI : 10.5916/jkosme.2011.35.6.802
One of the important mechanical properties of cryogenic temperature structure material is fracture toughness. Research on normalization of fracture toughness test method is becoming very important issue with development of cryogenic structural elements. Specially, mechanical properties estimation by each micro-structure of welding department is important because it can cause unstable fracture when use under cryogenic environment in case of welding department. In this study, fracture toughness estimation test was carried out to unloading compliance method and sensitization heat-tread minimized test specimen at liquid nitrogen (77K), liquid helium (4K), 293K temperature to STS-316L base metal and weld metal.
Numerical Simulation of Turbulent Flows in Inlet Duct of Heat Recovery Steam Generator
Kwag, Seung-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 809~813
DOI : 10.5916/jkosme.2011.35.6.809
Turbulent flows are numerically simulated in the three dimensional inlet duct for heat recovery steam generator. The present study is aimed to analyze the effect of a variation in turbulent flow pattern by the change of roof angle in the transition duct. The finite volume based Navier-Stokes equations with unstructured grids are solved to make clear the flow dynamic phenomena. Reviews are made on with the data of path lines, velocity vectors, dynamic pressure, residuals for numerical convergence and so on. The k-epsilon, k-omega, Reynolds stress and RNG k-epsilon are used for generation of turbulence. Two types of roof angle are applied with and without the swirl in the duct. Turbulent flow patterns could be investigated for the optimum duct design based on the computational results.
The Effect of Focal Length on Fuel Mixing And Combustion in One-focusing Oxygen Burner
Park, Kweon-Ha ; Kim, Ju-Youn ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 814~819
DOI : 10.5916/jkosme.2011.35.6.814
An Oxy-fuel combustion has been studied in order to reduce exhaust emissions and fuel consumption. The flow and flame behaviors are analyzed with focal length variation in one-focussing oxygen burner introduced in this study. Oxygen is supplied into the center of the nozzle, methane fuel is into the outer nozzle of the center, and then oxygen is again supplied into the outer of the fuel nozzle. The test conditions are 5 focal lengths of 100mm to 500mm. The mixing behaviors and temperature distributions are analyzed. The result shows that the shorter the focal length is, the longer the mixing length becomes, and the flame width and length are the biggest in the case of 300mm.
Design of Robust Speed Controllers for Marine Diesel Engine
Hwang, Soon-Kyu ; Lee, Young-Chan ; Kim, Chang-Hwa ; Jung, Byung-Gun ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 820~828
DOI : 10.5916/jkosme.2011.35.6.820
Energy saving is one of the most important factors for profits in marine transportation. In order to reduce the specific fuel oil consumption, the ship`s propulsion efficiency must be increased as much as possible. The propulsion efficiency depends upon a combination of propulsion engine and propeller that has better efficiency as lower rotational speed. As the engine has lower speed the variation of rotational torque become larger because of the longer delay time in fuel oil injection process. In this study, robust control theory is applied to the design of engine speed controllers which are sub-optimal
loop-shaping controller and
-synthesis controller considering robust stability and robust performance. And the validity of these three controllers is investigated through the results of computer simulation.
Development of LVDT-Based Measuring System of the Cylinder Liner Wear for Marine Diesel Engines and Its Performance Evaluation
Ha, Yun-Su ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 829~834
DOI : 10.5916/jkosme.2011.35.6.829
This paper introduces a new system which measures abrasion quantity of cylinder liners of large-scale marine diesel engines. The proposed system consists of three parts; measurement part where an LVDT, a temperature sensor, a camera and LED for lighting control are installed, monitoring part which accomplishes measurement command transmission and monitoring based on PC or notebook, and master control part which controls the measurement part and transfers measurement data to the monitoring part. The accuracy of the developed system is compared with that of an internal micrometer with 1/100 mm accuracy.
Development of Small Wave Power Controller for Ocean Facilities
Jo, Kwan-Jun ; Oh, Jin-Seok ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 835~841
DOI : 10.5916/jkosme.2011.35.6.835
Wave power generation systems operated in the ocean, has been developed as large power and grid power connection systems in general. However, small wave power generation systems offer operational efficiency for the lighted (navigation aids) buoy. They simply adopts a full-wave rectification for charging battery (direct connection method). In this paper, a wave power controller based on a booster converter is developed by considering a characteristic of the wells turbine. Both direct connection and booster converter power controller is designed and tested to compare the characteristics. Experiments demonstrate that the output of the proposed controller has improved the characteristic of output power, when generator output voltage is low.
A Study on the Tele-controller System of Navigational Aids Using Hybrid Communication
Jeon, Joong-Sung ; Oh, Jin-Seok ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 842~848
DOI : 10.5916/jkosme.2011.35.6.842
A fabricated hybrid control board using multi-communication is designed with a low power 8-bit microcontroller, ATxmega128A1. The microcontroller consists of 8 UART (Universal asynchronous receiver/transmitter) ports, 2 kbytes EEPROM, 128 kbytes flash memory, 8 kbytes SRAM. The 8 URAT ports are used for a multi-communication modem, a GPS module, etc. The EEPROM is used for saving a configuration for running programs, and the flash memory of 128 kbytes is used for storing a F/W (Firm Ware), and the 8 kbytes SRAM is used for stack and for storing memory of global variables while running programs. If we use the multi-communication of CDMA, TRS and RF to remotely control Aid to Navigation, it is able to remove the communication shadow area. Even though there is a shadow area for an individual communication method, we can select an optimal communication method. The compatibility of data has been enhanced as using of same data frame per communication device. For the test, 8640 of data have been collected from each buoy during 30 days in every 5 minutes and the receiving rate of the data has shown more than 85 %.
Preventive Measures of Battery Explosion in Lifeboat
Im, Myeong-Hwan ; Ahn, Byong-Won ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 849~855
DOI : 10.5916/jkosme.2011.35.6.849
Emergency batteries on board are used for stairs, pathway lights, and emergency communications during alternator black-out. In addition, there are engine start-up batteries in lifeboats. Typically, these batteries are installed under the Classification Rules. However, Since batteries inside life boats are installed in a confined narrow space, it is difficult to perform regular maintenances. Also, even though there are air vents in the life boat, the temperature inside the life boat often reaches above
, which is much higher than the regulation temperature,
. In this paper, we will summarize the accident of battery explosion occurred in MMU training ship, and possible causes. We will propose preventive measures of battery explosions as well as the revision of the regulation.
A Study on the Necessity of Korean Standard and Code of Safety for Diving System
Park, Jong-Yeob ; Kang, Sin-Young ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 856~860
DOI : 10.5916/jkosme.2011.35.6.856
The standard and code of safety for diving systems include requirements in the area of diving plant, personnel qualification, diving medicine and operation. In this study the necessity of Korean standard and code of safety for diving system is suggested through the review and comparison of the diving system regulations of domestic as well as foreign governments and other private organizations. Furthermore, by reviewing the status of oversea`s diving organizations the proposition was made which can lead the commercial diving sector to international cooperation.
The Research of the Hybrid Power Generation using Ocean Wave
Han, Ki-Bong ; Lee, Hyoung-Woo ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 861~866
DOI : 10.5916/jkosme.2011.35.6.861
This paper described the hybrid power generation using ocean wave that consists of linear power generation system and vibrational power generation system. The linear power generation system is made up of the winding coil, the permanent magnet and it is performed stable generation regardless of the wave frequency using directly the ocean wave velocity. And the vibration power generation system consists of the winding coil, the permanent magnet and spring. When the vibration system natural frequency in the vibrational power generation system is tuned to the ocean wave frequency, the relative velocity of between the winding coil and the permanent magnet is faster than the velocity of ocean wave up and down motion, then we can obtain more the electric power. Therefore, in this paper, the proposed hybrid power generation using ocean wave have merits that obtaining the more electric energy in resonance frequency and carrying out stable generation even over the range of resonance frequency.
Dynamic Analysis of Spar Hull Transportation
Lee, Jong-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 6, 2011, Pages 867~873
DOI : 10.5916/jkosme.2011.35.6.867
The transportation of a truss-spar hull from a transport barge of 6000 ton topside module on the spar hull is investigated in the present study. Two possible routes from a fabrication yard in Teeside, England to the Gulf of Mexico are considered in the paper. The results of motion responses of the transport barge obtained from a spectral analysis and the limiting criteria of sea fastening, deck wetness and lateral acceleration are compared and the route selection is discussed. Long-crested waves and short-crested seas as well as the joint probabilities of significant wave heights and wave periods in different sea areas are considered. Generally speaking, the results for long-crested seas are higher than those for short-crested waves.