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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 34, Issue 8 - Nov 2010
Volume 34, Issue 7 - Nov 2010
Volume 34, Issue 6 - Sep 2010
Volume 34, Issue 5 - Jul 2010
Volume 34, Issue 4 - May 2010
Volume 34, Issue 3 - May 2010
Volume 34, Issue 2 - Mar 2010
Volume 34, Issue 1 - Jan 2010
Selecting the target year
Performance Analysis of Methanol Fueled Marine Solid Oxide Fuel Cell and Gas Turbine Hybrid Power System
Oh, Sae-Gin ; Lim, Tae-Woo ; Kim, Jong-Su ; Kil, Byung-Lea ; Park, Sang-Kyun ; Kim, Mann-Eung ; Lee, Kyung-Jin ; Oh, Jin-Suk ; Kim, Myoung-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1040~1049
DOI : 10.5916/jkosme.2010.34.8.1040
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 methanol fueled SOFC/GT hybrid power system and to analyze the influence of operating temperature of stack, current density of stack, pressure ratio of turbine, temperature effectiveness of recuperator, turbine inlet temperature.
The Effect of Hydrogen Added into In-let Air on Industrial Diesel Engine Performance
Park, Kweon-Ha ; Lee, Jin-A ; Lee, Wha-Soon ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1050~1056
DOI : 10.5916/jkosme.2010.34.8.1050
Diesel engines introduce only air into the cylinder, and the air is high lycompressed. Fuel is directly injected into the combustion chamber in high temperature and pressure. Therefore diesel engines have high thermal efficiency because of the high compression ratio, while having high level of particulate matter and nitrogen oxide emissions because of the direct fuel injection. Many technologies have been developed to reduce particulate matter and nitrogen oxide emissions from diesel engines. One of the technologies is hydrogen fuel introduced into the combustion chamber with diesel fuel. In this thesis tiny amount of hydrogen is supplied into the combustion chamber in order to enhance the combustion performance. The engine, in which hydrogen is introduced, is tested. There are 20 test conditions given as 5 torque values of 100%, 75%, 50%, 25%, 0%, and 4 engine speeds of 700rpm, 1000rpm, 1500rpm and 2000rpm for the two cases with or without hydrogen addition. Maximum torques and Idle torques at each engine speed are measured, then the torque values are divided into 4 levels with 25% increasing step. The result shows that the fuel consumption, smoke, CO are reduced while the NOx emission is slightly increased, and the hydrogen addition has not a great effect on the performance at low loads but a great effect at a maximum load.
Development of the Multi-Gear Train Devices of Synchro System for the Guns of a Warship which Considered the Noise/Vibration
Lee, Hyoung-Woo ; Hur, Nam-Soo ; Kim, In-Hwan ; Lee, Dong-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1057~1067
DOI : 10.5916/jkosme.2010.34.8.1057
Vibration and noise analysis as well as strength of gear teeth, gear profile design are considered in order to develop the multi-gear train devices of synchro system for the guns of a warship. A new approach to the critical speed calculation of practical industrial multi-mesh geared system is presented. A transfer matrix model based on Hibner's branch method is developed and the natural properties of the branched rotor system are calculated with using the
-matrix formulation. A Campbell diagram, in which the excitation sources caused by the mass unbalance of the rotors and the transmitted errors of the gearing are considered, shows that, at theoperating speed, there are not the critical speed.
Improving Yield Strength of A694-F70 Flange Manufactured by Hot Forging Process
Woo, Ta-Kwan ; Lee, Hyun-Woo ; Jeon, Chung-Hwan ; Chang, Young-June ; Kim, Chul ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1068~1073
DOI : 10.5916/jkosme.2010.34.8.1068
A welding neck flange is widely used for an interconnection between pipes. It is produced by a hot forging process, and required high yield strength under the high pressure condition, like a deep-sea. Generally, to increase yield strength, a increasing of carbon content is used, however a carbon content of welding neck flange is limited to 0.47. So, in this study, a strengthening by grain refinement without changing carbon content is used to increase yield strength. Taguchi method and FEM are used for the optimization of forging process and the experiment for the yield strength of the prototype with the optimal forging process is performed for validity.
A Study on the Sloshing Reduction of a Cargo Fuel Tank with Baffle
Yoon, Bo-Hyun ; Yoon, Jun-Kyu ; Lim, Jong-Han ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1074~1083
DOI : 10.5916/jkosme.2010.34.8.1074
Recently sloshing that fluid in fuel tank is undulating by the external force during motion of automobile, ship and aircraft is greatly affecting by damaging the inside of structure. It's most important to precisely analyze the behavior of fluid by computational fluid dynamics for minimizing the effect of sloshing for the loaded fuel. This study characterized volume of fluid and pressure according to the length and number of vertical baffle and horizontal baffle in fuel tank for Kia Frontier cargo and analyzed for reduction of sloshing during driving on corner and hill by using ADINA-CFD. As a result of analysis, the optimum length for sloshing reduction shows 0.19 m for vertical baffle and 0.08 m for horizontal baffle. And it shows that vertical baffle is better for the reduction effect of sloshing during driving on corners, on the other hand, horizontal baffle is effective and stable during driving on hills.
Large Eddy Simulation of Turbulent Premixed Combustion Flow around Bluff Body based on the G-equation with Dynamic sub-grid model
Park, Nam-Seob ; Ko, Sang-Cheol ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1084~1093
DOI : 10.5916/jkosme.2010.34.8.1084
Large eddy simulation of turbulent premixed flame stabilized by the bluff body is performed by using sub-grid scale combustion model based on the G-equation describing the flame front propagation. The basic idea of LES modeling is to evaluate the filtered-front speed, which should be enhanced in the grid scale by the scale fluctuations. The dynamic subgrid scale models newly introduced into the G-equation are validated by the premixed combustion flow behind the triangle flame holder. The calculated results can predict the velocity and temperature of the combustion flow in good agreement with the experiment data.
Analysis of Laminar Flows around Submerged Spheres
Kwag, Seung-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1094~1099
DOI : 10.5916/jkosme.2010.34.8.1094
Three dimensional laminar flows are numerically simulated around the submerged spheres. The finite volume based Navier-Stokes equations with unstructured grids are solved to make clear the hydrodynamic phenomena near and far away from the body. Reviews are made on with the vorticity, velocity, dynamic pressure, residuals, drags, etc. The Reynolds numbers under consideration are 425, 300, 250 and 100. In case of small spacing between spheres, the flow is more stable than that past a single sphere. According to the analysis, the flow past two spheres is found to be unstable as the spacing becomes larger. The rear sphere shows the deduction of stagnation pressure, which results in the decrease of the resistance. The predicted drag coefficients verify that the present numerical calculation is reasonable.
Temperature Control for LED with fan circulated air-cooling system
Choi, Hyeung-Sik ; Yoon, Jong-Su ; Lim, Tae-Woo ; Seo, Hea-Yong ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1100~1106
DOI : 10.5916/jkosme.2010.34.8.1100
LED(Light Emitting Diode) has the defects of low efficiency and reducement of life cycle as its temperature increases. This research is about an efficient temperature control of the LED. For LED temperature control, it is shown that a heat sink, fan, a one-chip microprocessor and the PID control algorithm are a good cooling system through experiments. Finally. by using the fan as a cooling device and controlling it appropriately, it is proved that the intensity of illumination and the desired temperature can be achieved with consumption of only 2% of the driving power of the LED system through control experiments.
Development of Underwater Manipulator Driven by Electric Motor
Choi, Hyeung-Sik ; Hong, Sung-Yul ; Jeon, Ji-Kwang ; Park, Han-Il ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1107~1114
DOI : 10.5916/jkosme.2010.34.8.1107
In this paper, a development of a new 5 d.o.f. underwater manipulator which is actuated by electric motors capable of carrying over 20kg payload and of various operation under the water has been studied. The manipulator for applying to midium-sized AUV or ROV has been designed small and light but to handle a heavy 25kg payload. The joint actuator for the manipulator is designed and builted as a new modular typed double oil jacket for waterproofness. Also, superior joint torque performance of the developed joint actuator has been varified through tests in the air. And, a 5 d.o.f. highly perfomable underwater manipulator has been builted applying the developed underwater joint actuators.
Comparison of Fault Detection Methods for the BLDC Motor Using the Current Sensor
Lee, Jae-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1115~1127
DOI : 10.5916/jkosme.2010.34.8.1115
Several methods have been applied to detect winding faults (turn-to-turn short). The representative approaches have been focusing on current signals. The current signal can give important information to extract features and to detect faults. In this study, current sensors were installed to measure signals for fault detection of BLDC motors. Therefore, it is necessary to select proper feature extraction methods among the popular methods that use current signals.
Development of Underwater Thrusting System Driven by 300W Class BLDC Motor
Choi, Hyeung-Sik ; So, Myung-Ok ; Park, Han-Il ; Park, Warn-Gyu ; Jang, Ha-Yong ; Hong, Sung-Yul ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1128~1134
DOI : 10.5916/jkosme.2010.34.8.1128
This paper is about the development of the 300W underwater thrusting system driven by a brushless DC motor (BLDC) for underwater robots. A design of the structure such as the structure analysis on the thrusting system using FEM and the design of the propeller using the fluid analysis has been performed. Also, a new structure such as decoupling and non-gear structure has been explained. The performance test of the designed and developed thrusting system in water and in air was undertaken and its results were compared with an existing product with high performance. The comparison results show that the developed thrusting system has better performance by 16% in forward thrusting force and by 12% in backward thrusting force.
A Study on the Building of Open Operational System for the Integration Management System of the Maritime Traffic Facilities
Jeon, Joong-Sung ; Lee, Seo-Jeong ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1135~1144
DOI : 10.5916/jkosme.2010.34.8.1135
The high tech marine transportation infrastructure is an innovative transportation infrastructure that may be able to secure a safe transportation environment as well as efficient operation by connecting up-to-date skills including a broad range of wire and wireless communication-based information, control and electronics technologies. When integrated into the marine transportation infrastructure by the standard requirements, these standard technologies help monitoring and managing navigational aids. This paper defined a concept of middleware in the marine traffic management systems which gives characteristics of system independency, scalability, extensibility, and researches a functionality of the middleware and a software block of the middleware.
An Augmented WiMAX MMR Protocol for Establishing Secure Broadband Maritime Data Networks
Lee, Su-Hwan ; Son, Joo-Young ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1145~1152
DOI : 10.5916/jkosme.2010.34.8.1145
Currently economical communication technologies are needed for high speed data exchange at sea. Wireless environments at sea require some special communication security solutions as well. In this paper, an augmented WiMAX MMR protocol is proposed as a solution of the broadband data communications and security at sea environments fundamentally with no base station.
Vibration Reduction Control of Marine Electronic Horizontal Balancer
Yang, Hyun-Suk ; Yoon, Kyoung-Kuk ; Kim, Yoon-Sik ; Seo, Dong-Hoan ; Kim, Sung-Hwan ; Kwon, Yeong-Gwal ; Lee, Sung-Geun ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1153~1158
DOI : 10.5916/jkosme.2010.34.8.1153
In this paper, We make horizontal balancer (HB) and confirm a possibility of the technique that can be applied to ship through horizontal vibration reduction experiment. We use MATLAB as the simulator tool and experimental equipment consists of two induction motors shafts of which cam type unbalanced loads are fixed to, DSP and inverter circuit. Two induction motors perform roles as vibrator and balancer respectively, DSP control softwares such as speed, phase and vector control program. The simulation and experimental results show that the balancer characterizes good vibration reduction by phase control.
Max-Win based Routing(MWR) Protocol for Maritime Communication Networks with Multiple Wireless Media
Son, Joo-Young ; Mun, Seong-Mi ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1159~1164
DOI : 10.5916/jkosme.2010.34.8.1159
The current maritime data communications mainly depend on radio and satellite which have restrictions on data rate and cost. That leads to needs of novel relatively-high-speed data communication systems at sea just like on land. This paper proposes a routing protocol (MWR) for newly designed model of ship-to-ship communication networks at sea. The MWR protocol finds out an optimal route by selecting an optimal network for each specific application from overlapped networks of available wireless media at sea.
Improving the PTS Method for the PAPR Reduction in the OFDM System
Kim, Dong-Seek ; Kwak, Min-Gil ; Cho, Hyung-Rae ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1165~1171
DOI : 10.5916/jkosme.2010.34.8.1165
The OFDM system has better characteristics in transmission rate, power efficiency, bandwidth efficiency, impulse-noise immunity, and narrow band interference immunity etc. in comparison with other conventional systems. However, high PAPR of an OFDM signals causes some serious non-linear processing of RF amplifier. And performance of the communication system gets worse. Therefore, various methods reducing PAPR of an OFDM skills such as the clipping method, block coding method, and phase rotation method etc. have been researched. In this paper, we propose a high-speed adaptive PTS method which eliminates high PAPR. And we compare the proposed method with other conventional methods. The proposed method has decreased quantity of calculation compare with an adaptive PTS method. Of course, The more its calculation amount is decreased, the more its BER characteristic is not better than an adaptive PTS method. However, keeping up satisfactory BER performance, we highly improved calculation amount of a PTS method.
A Development of MiTS Network Protocol based on Light-Weight Ethernet
Hwang, Hun-Gyu ; Yoon, Jin-Sik ; Lee, Seong-Dae ; Seo, Jeong-Min ; Jang, Kil-Woong ; Lee, Jang-Se ; Park, Hyu-Chan ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1172~1179
DOI : 10.5916/jkosme.2010.34.8.1172
In this paper, we analyze and design requirements of Network Function block and System Function block of MiTS network protocol based on Light-Weight Ethernet, also implement and test the protocol and library files. Light-Weight Ethernet Protocol consists of Network Function block and System Function block. NF receives and sends datagram based on UDP multi-casting communication. SF processes messages after distinguished Sentence and Binary Image Data.
A Development of MiTS Service Modules based on Light-Weight Ethernet
Hwang, Hun-Gyu ; Yoon, Jin-Sik ; Seo, Jeong-Min ; Lee, Seong-Dae ; Lee, Jang-Se ; Park, Hyu-Chan ; Jang, Kil-Woong ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1180~1187
DOI : 10.5916/jkosme.2010.34.8.1180
In these days, data processing rate is increasing on shipboard. To solve the problems on the rate, Ethernet based IEC 61162-4 series standard established for integrated information management. But the standard is difficult to implement, so it is changed into Light-weight Ethernet standard. In this paper, we analyze the existing standard and compare it with Light-weight Ethernet standard. As a result, we draw its service requirements. Also we propose the services, and design and implement the service modules.
A Design and Implementation of Database for Integrated Data Management on Shipboard
Seo, Jeong-Min ; Hwang, Hun-Gyu ; Yoon, Jin-Sik ; Lee, Seong-Dae ; Park, Hyu-Chan ; Lee, Jang-Se ; Jang, Kil-Woong ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1188~1194
DOI : 10.5916/jkosme.2010.34.8.1188
On shipboard, several kinds of data are generated from many equipments. Although these data are mainly used for the safe navigation of ship, their usability may be enhanced if they are managed on a database. However, because these data have different formats according to the kinds of equipments, an integrated database is required. This paper presents a design and implementation of such database.
A computation module to compensate the power factor at 2 parameter equivalent circuit for modelling 3 phase induction motors
Choi, Soon-Man ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1195~1202
DOI : 10.5916/jkosme.2010.34.8.1195
When modelling lots of induction motors to design and configure an engine room simulator, the 2 parameters equivalent circuit has many practical benefits as it reduces working hours considerably without requiring complicated technical data from makers except the ratings of motors. The basic properties such as torque and load current are shown well matched with real cases by this method, but almost the only drawback of 2 parameters circuit is that it reveals inherently higher power factor in the whole operation range due to disregarding the exciting current of the induction motor to maximize the simplification. This paper suggests a modelling module as a practical tool to compensate the power factor by inserting a virtual compensation current into the load current from 2 parameters equivalent circuit, and the simulated results show satisfactory outputs and the improved power factor indication by performance curves when compared to the cases of 2 parameters-equivalent circuit.
A Study on Geology and Sediment Characteristics in Danghang Bay Area, Gyeongnam
Kim, Jin-Hoo ; Kim, Sung-Bo ; Lee, Young-Hyun ; Kim, Chan-Soo ; Ryu, Choon-Kil ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1203~1211
DOI : 10.5916/jkosme.2010.34.8.1203
In order to study geology and sediment characteristics in Danghang Bay area, surface geological survey, SBP (sub-bottom profiler) survey, and sediment analysis were conducted. Danghang Bay area has a closing coast surrounded by land, and surface layer are covered by mud and sandy mud. Sedimentary facies of the surface layer consists of Mm and Mms facies. A SBP seismic survey shows that gas bearing sediments might be spread throughout the sediment layers, so that it seems to be hard to find acoustic basement and gas seeps are easily found throughout the survey lines. The gas trapped in the sediments may be related to the high organic contents of the sediment, and the thick mud layer may restrain the gas from releasing.
A Study on the Forecast of Marine Fuel Cell Market
Park, Han-Woong ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1212~1221
DOI : 10.5916/jkosme.2010.34.8.1212
Recently, various types of ships are facing with a challenge to adopt the high efficient and environment-friendly power generating systems. For the reduction of exhaust emissions, improvement of thermal efficiency, and lowering the noise and vibration levels, fuel cells are gaining the much more interests. This paper projects the future marine fuel cell market on the basis of considering the historical world shipbuilding and marine engine market. To do this, the number of total ship is, at first, obtained by forecasting the number of annual new shipbuilding orders and completions. Finally, fuel cell market is forecasted by obtaining the engine capacity for annual world total number of ships and engine orders.
Ultra High Resolution Shallow Acoustic Profiling using the Parametric Echo Sounder: Discrimination of Marine Contaminated Sediments and Burial Depth Inspection of the Submarine Cable
Jung, Seom-Kyu ; Lee, Yong-Kuk ; Kim, Seong-Ryul ; Oh, Jae-Kyung ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1222~1229
DOI : 10.5916/jkosme.2010.34.8.1222
Compared to conventional high resolution acoustic profiling, ultra high resolution shallow acoustic profiling using parametric echo sounder is limited in penetration, yet it provides resolution suitable for detailed seabed investigation in the shallow waters. The parametric sub-bottom profiler system provides not only the exact determination of water depth, but also the detailed information about sediment layers and sub-bottom structures. Possible applications include dredging project, search of buried pipeline, ship wrecks, and other artificial objects through the detailed mapping of thickness and structure of the upper sedimentary layers. In this study, contaminated sediments were discriminated by the correlation of ultra high resolution profiles with geologic data. In addition, the burial depth of the submarine cable was measured by the interpretation of acoustic anomalies in the profiles.
Study on the Development of the Business Model of Global A/S System at Marine Equipments
Kim, Young-Hun ;
Journal of the Korean Society of Marine Engineering, volume 34, issue 8, 2010, Pages 1230~1238
DOI : 10.5916/jkosme.2010.34.8.1230
The manufacturing output of our country's marine equipment industry has enlarged due to the rapid growth of the shipbuilding industry in our country since the 1990's. But recently, the relative newcomers, BRICs, Vietnam and Turkey promote the shipbuilding industry with the government supports, but these countries will be the huge market in the marine equipments. So that, the marine equipment companies of our country should strengthen the international competitiveness, specially with the reinforcement of overseas marketing and after service. Korea Marine Equipment Association(KOMEA) established the Global Support Center in Busan to strengthen overseas marketing and technical A/S. In this paper, the more effective global A/S system and business model for marine equipment industry are suggested including the strategic action plan, considering the demands of customer and the mechanism of A/S in marine equipments.