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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 36, Issue 8 - Nov 2012
Volume 36, Issue 7 - Nov 2012
Volume 36, Issue 6 - Sep 2012
Volume 36, Issue 5 - Jul 2012
Volume 36, Issue 4 - May 2012
Volume 36, Issue 3 - May 2012
Volume 36, Issue 2 - Mar 2012
Volume 36, Issue 1 - Jan 2012
Selecting the target year
Performance Analysis of Hybrid SOFC/GT/ST System for Marine Power Applications
Lee, Kyung-Jin ; Oh, Jin-Suk ; Kim, Sun-Hee ; Oh, Sae-Gin ; Lim, Tae-Woo ; Kim, Jong-Su ; Lee, Jae-Hyun ; Park, Sang-Kyun ; Kim, Mann-Eung ; Kim, Myoung-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 40~50
DOI : 10.5916/jkosme.2012.36.1.40
The electrification of the waste heat of stack is necessary to enhance the efficiency of fuel cell system. For this purpose, the hybrid SOFC/GT/ST system is suitable. The purpose of this work is to predict the performance of methane fueled SOFC/GT/ST hybrid power system and to analyze the influence of operating temperature of stack, current density of stack, and gas turbine pressure ratio. According to the analysis, it is proved that the SOFC/GT/ST hybrid system suppress the rapid decrease in efficiency and lead to the significant improvement of efficiency as compared with SOFC system.
Generation Efficiency and Thermal Performance of a Thermoelectric Generator with a High Power Electronic Component
Kim, Kyoung-Joon ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 51~56
DOI : 10.5916/jkosme.2012.36.1.51
This paper reports the generation efficiency and the thermal performance of a thermoelectric generator (TEG) harvesting energy from the waste heat of high power electronic components. A thermoelectric (TE) model containing thermal boundary resistances is used to predict generation efficiency and junction temperature of a high power electronic component. The predicted results are verified with measured values, and the discrepancy between prediction and measurement is seen to be moderate. The verified TE model predicts generation efficiencies, junction temperatures of the component, and temperature differences across a TEG at various source heat flows associated with various electrical load resistances. This study explores effects of the load resistance on the generation efficiency, the temperature difference across a TEG, and the junction temperature.
Numerical Study on Heat Transfer and Pressure Drop Characteristics in a Horizontal Channel with Dimple and Protrusion Arrays
Kim, Ji-Hoon ; Heo, Joo-Nyoung ; Shin, Jee-Young ; Son, Young-Seok ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 57~63
DOI : 10.5916/jkosme.2012.36.1.57
In this study, numerical analyses were performed on pressure drop and heat transfer characteristics in a rectangular horizontal channel with dimple and protrusion arrays of different height. The dimples/protrusions were installed at both top and bottom walls of the rectangular channel. The dimple and protrusion depths are 0.125, 0.2, 0.25, 0.3, and 0.375 times diameter. In case of the dimple, the highest Nusselt number occurred at the rear side of the dimple, and the average Nusselt number tended to decrease slightly with increase of depth. In case of protrusion, on the other hand, the highest Nusselt number occurred at the front side of the protrusion, and the average Nusselt number was increased with the increase of height. In both dimple and protrusion, the average Nusselt number and pressure drop were increased with the increase of velocity. Performance factor was decreased with the increase of velocity, and it was found that the best performance factor was obtained in the low velocity region.
Heat Dissipation of Sealed LED Light Fixtures Using Pulsating Heat Pipe Technology
Kim, Hyung-Tak ; Park, Hae-Kyun ; Bang, Kwang-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 64~71
DOI : 10.5916/jkosme.2012.36.1.64
An efficient cooling system is an essential part of the electronic packaging such as a high-luminance LED lighting. A special technology, Pulsating Heat Pipe (PHP), can be applied to improve cooling of a sealed, explosion-proof LED light fixture. In this paper, the characteristics of the pulsating heat pipes in the imposed thermal boundary conditions of LED lightings were experimentally investigated and a PHP device that works free of alignment angle was investigated for cooling of explosion-proof LED lights. Five working fluids of ethanol, FC-72, R-123, water, and acetone were chosen for comparison. The experimental pulsating heat pipe was made of copper tubes of internal diameter of 2.1 mm, 26 turns. A variable heat source of electric heater and an array of cooling fins were attached to the pulsating heat pipe. For the alignment of the heating part at bottom, an optimum charging ratio (liquid fluid volume to total volume) was about 50% for most of the fluids and water showed the highest heat transfer performance. For the alignment of the heating part on top, however, only R-123 worked in an un-looped construction. This unique advantage of R-123 is attributed to its high vapor pressure gradient. Applying these findings, a cooling device for an explosion-proof type of LED light rated 30 W was constructed and tested successfully.
The Effect of Bio-diesel Fuel on Industrial Diesel Engine
Park, Kweon-Ha ; Kim, Ju-Youn ; Kim, Chul-Jung ; Ko, Jea-Hyun ; Park, Hong-Il ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 72~77
DOI : 10.5916/jkosme.2012.36.1.72
An alternative fuel is introduced as an environmentally friendly fuel in order to reduce the toxic emissions from conventional fossil fuels. In this study a bio-diesel fuel is produced and applied into the industrial diesel engine to understand the effect on the performance. The test conditions are loads of idle to maximum torque and engine speeds of 700 to 1900 rpm in bio-diesel blending percents of 0, 10, 20%. The results show that smoke and CO emissions are reduced while NOx in slightly increased, and the effects are rather clear in higher loads.
A Study on the Diode Laser Surface Hardening Treatment of Cast Iron for Die Material(III) - Characteristics of Microstructures in Hardened Zone -
Kim, Jong-Do ; Song, Moo-Keun ; Hwang, Hyun-Tae ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 78~84
DOI : 10.5916/jkosme.2012.36.1.78
Mold may experience deterioration of molding quality as the abrasion of mold occurring due to friction between mold and molded product works as allowance in the course of press process. Therefore, to improve the wear-resistance of mold, methods like nitriding, carburizing, flame and induction surface hardening treatment etc have been applied. However, as such methods are accompanied by problems like shape limitation or product deformation etc, laser surface treatment technology is under review as surface treatment method that can solve such problems. Therefore, in this study, mold material cast iron was surface-treated by using high power diode laser. In previous report 1 and report 2, the heat treatment characteristics were compared by the differences of die materials and shapes, then this paper observed microstructure by using optical microscope and scanning electronic microscope to analyze the structural difference of hardened zone, interface area and base metal after heat treatment. And the structural condition was grasped through EDS. As a result of microstructure, hardened zone showed formation of acicular martensite.
Research on Fafigue Life Prediction of Muffler with Weld-zone Shape
Kim, Jong-Yun ; Kang, Sung-Su ; Kim, Gug-Yong ; Park, Soon-Cheol ; Kim, Chung-Kwan ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 85~93
DOI : 10.5916/jkosme.2012.36.1.85
In this study, the geometry of the weld is used to develop the process of fatigue life prediction. For the development of fatigue life prediction process, bending fatigue test of muffler is conducted to obtain M(Moment)-N(Fatigue life) diagram. Modeling the geometry of the weld which is failed is performed to conduct static load analysis and analysis results are used to calculate the stress concentration factor. The stress concentration factor is used to get the fatigue notch factor and this was based on the fatigue life prediction. As a result of the comparison of test values and predicted values, predicted values are verified.
The Flow Control by a Vertical Splitter Plate for a Square Prism near a Wall
Ro, Ki-Deok ; Cho, Ji-Ryong ; Oh, Se-Kyung ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 94~100
DOI : 10.5916/jkosme.2012.36.1.94
The passive control by vertical splitter plate of fluid force acting on a square prism near a plane wall was studied by measuring of fluid force on the prism and by visualization of the flow field using PIV. The hight of the splitter plate was 10% of the square width. The experimental parameters were the attaching position of vertical splitter plate and the space ratios G/B to the prism height. Time variation of vorticity was most remarkable at 3.0B(B: prism height) position toward wake direction from the center of the prism. The point of inflection of average lift coefficient and Strouhal number on the prism were represented at the space ratio G/B=0.4~0.6 for the prism having vertical splitter plate. The drag of the prism was reduced average 5.0% with the space ratios by attaching the vertical splitter plate at the upper and rear corner on the prism. In this case, the size of the separated region on the upside of the prism was smaller than that of prism having no the splitter plate.
Design and Structure Analysis of a Tower Service Lift for Offshore Wind Power System
Choi, Young-Do ; Son, Sung-Woo ; Jang, Ho-Choul ; Choi, Nak-Joon ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 101~108
DOI : 10.5916/jkosme.2012.36.1.101
The purpose of this study is to establish a design method of tower service lift for offshore wind power system, as well as to conduct structure analysis of the service lift system. The service lift system will be built in the internal area of tower of the offshore wind power system. Design and structure analysis for the tower service lift system are conducted to clarify the stability and reliability of the system. Main objective of the design is to secure sufficient capability of transportation of workers and equipment with satisfactory performance within the designed tolerance limit. Total deformation and equivalent stress of the lift system by external load are examined using the results of structure analysis.
A Study on the Flow Characteristic of the Diesel Engine DPF
Go, Hyun-Sun ; Jung, Chan-Gyu ; Lee, Heang-Nam ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 109~117
DOI : 10.5916/jkosme.2012.36.1.109
This paper addresses influence on the flow field by varying the length of DPF Inlet pipe in 5 ways. Numerical analysis is carried out by using PIV and commercial code and as a result, PIV and commercial code shows correlation correspond to 87%. Furthermore, in the same velocity condition, as stable and high pressure value is shown when the Inlet pipe length is 20mm, particulate filtering rate can be increased.
Tension/Movement Control of Working Robot and Dynamic Model of the Stringing Wire Cable
Hong, Jeng-Pyo ; Kim, Yoon-Sik ; Lee, Sung-Geun ; Hong, Soon-Ill ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 118~125
DOI : 10.5916/jkosme.2012.36.1.118
In this paper, an approach to designing controllers for the tension/movement control of working robot to install a stringing wire cable is presented. To design a controller, when the robot moves a certain distance maintaining constant tension, the dynamic model of a stringing wire cable which considers effects of weights according to changing lengths is presented. Also the tension at startup of the working robot is studied by numerical analysis which is based on the equation of the dynamic wire model. From the dynamic model for a stringing wire cable, working robot for tension/movement control is suggested and designed a feedforward controller with a accelerator gain to suppress a mutual interference of the both tasks of tension/movement control. Depending on the operating conditions of the working robot, the effectiveness of the suggested system has been verified by the simulation and experimental results.
A Design of GA-Based Model-Following Boiler-Turbine H∞ Control System Having Robust Performance
Hwang, Hyun-Joon ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 126~132
DOI : 10.5916/jkosme.2012.36.1.126
This paper suggests a design method of the model-following H
control system having robust performance. This H
control system is designed by applying genetic algorithm(GA) with reference model to the optimal determination of weighting functions and design parameter
that are given by Glover-Doyle algorithm which can design H
controller in the state space. These weighting functions and design parameter
are optimized simultaneously in the search domain guaranteeing the robust performance of closed-loop system. The effectiveness of this H
control system is verified by applying to the boiler-turbine control system.
A Study on the Control Scheme of Vibration Isolator with Electrical Motor
Nam, Taek-Kun ; Le, Dang-Khanh ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 133~140
DOI : 10.5916/jkosme.2012.36.1.133
In this study, a reliable control scheme with PID combined controller will be considered. The combined controller in this study is PID algorithm with parameters tuned by using ILC (iterative learning control) approach. The controller was applied to the vibration isolator using an induction motor which works as an actuator. This isolator is developed to eliminate the influence of vibration from rotating machineries on the small ship. The NI cRIO real time controller with FPGA is loaded to get or generate control signals. Crank mechanism which converts rotating energy into translational force is adopted and the relation between control force and torque generated from actuator is also analyzed. A Labview program is composed for controlling practice. Experimental results will be described to show the effectiveness of the proposed control schemes.
Variable Priority Number Control of SPMS for Leisure Ship
Oh, Jin-Seok ; Park, Do-Young ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 141~148
DOI : 10.5916/jkosme.2012.36.1.141
The power system of leisure ship has a character of stand-alone type, so it continuously checks the usable power. Especially, the leisure ship using renewable energy needs to adjust the power consumption of loads according to the usable power. Also, the important loads of leisure ship are different by operation mode. However, current power management system doesnot consider such character. This paper studied load management system of the SPMS(Smart Power Management System) and composed using the smart plug. The SPMS controls the loads depending on a user's pattern and character through variable priority number control. This control algorithm was verified through simulation of assumed user and situation using LabVIEW.
A Low Loss and Short-wavelength Transmission Line Employing Inverted Periodically Arrayed Capacitive Devices and Its Application to Miniaturized Passive Components on MMIC
Yun, Young ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 149~156
DOI : 10.5916/jkosme.2012.36.1.149
In this study, we propose a novel transmission line employing inverted PACD (Periodically Arrayed Capacitive Devices) for application to a development of miniaturized passive components on MMIC. The novel microstrip line employing Inverted PACD structure showed a loss much lower than conventional microstrip line. Using the inverted PACD structure, we fabricated a miniaturized impedance transformer on MMIC. the size of the impedance transformer was 0.012
, which is only 1.7% of conventional one. The impedance transformer showed good RF performances in a frequency range of 2.25~6.5 GHz.
A Study on Basic Characteristics of Short Wavelength Transmission Line Employing Periodically Arrayed Capacitive Devices and Its Application to Highly Miniaturized Passive Components on MMIC
Jang, Eui-Hoon ; Jeong, Jang-Hyeon ; Choi, Tae-Il ; Yun, Young ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 157~165
DOI : 10.5916/jkosme.2012.36.1.157
In this study, a short-wavelength transmission line employing periodically arrayed capacitive devices (PACD) was studied for application to miniaturized on-chip passive component on monolithic microwave integrated circuit (MMIC). The transmission line employing PACD showed shorter wavelength and lower characteristic impedance than conventional microstrip transmission line. The wavelength transmission line employing PACD structure was 8% of the conventional microstrip transmission line on GaAs substrate. Using the theoretical analysis, basic characteristic of the transmission line employing PACD (e.g., loss, effective dielectric constant, effective propagation constant, bandwidth ) were also investigated in order to evaluate its suitability for application to a development of miniaturized passive on-chip components on MMIC. Above results indicate that the transmission line employing PACD is a promising candidate for a development of miniaturized passive components on MMIC.
A study on the Frequency Modulation-based Audio Transmission System for Short-range Underwater Optical Wireless Communications
Kim, Yeon-Joo ; Sohn, Kyung-Rak ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 166~171
DOI : 10.5916/jkosme.2012.36.1.166
In this paper, short-range underwater wireless communication technique using visible LEDs is proposed. As an alternative to conventional acoustic system, visible LED communications show high quality and high speed data transmission characteristics. We design a frequency modulation-based optical wireless audio transmission system. The CD4046B phase-locked loop device is applied to implement the frequency modulation and demodulation. With a transmission modulation of 100 kHz, audio signal has successfully received at a transmission distance of 30 cm.
A Development of the Starting Motor for Packaged Power Systems
Kim, Jong-Su ; Kim, Seung-Hwan ; Oh, Sae-Gin ; Kim, Yong-Geun ; Kim, Hyun-Su ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 172~178
DOI : 10.5916/jkosme.2012.36.1.172
Packaged power systems are very convenient for transferring and installing, and can supply electric power steadily for the areas which have a great difficulty in drawing power line from the outside. Then, the equipments have been widely used in such mountain areas and the back of beyond. Generally, compressed air has been employed to start the dynamo-engines for P.P.S. However, these systems necessitate air compressors, air tanks, air starting motors and pipe lines for transferring compressed air etc. Recently, starting systems which have only batteries and series DC motors as whole automobiles have been applied due to their simplicity and economy. In this paper, developed new starting motor for the P.P.S. And we achieved the better results from performance tests.: Output power, torque and speed.
Study on Short-range Non-line-of-sight Ultraviolet Communication
Park, Dong-Kook ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 179~184
DOI : 10.5916/jkosme.2012.36.1.179
A conventional wireless rf communication has relatively high ratio of power dissipation to transmit power for short-range links, susceptibility to interference, interception and jamming of electromagnetic wave. The study on alternative using ultraviolet signal to remedy the shortcomings of conventional rf communication has recently received attention. In this paper, the simulation results about the data rate performance of ultraviolet non-line-of-sight communication are provided. It is found that the direction of transmitting beam, receiving field of view width and the transmitting signal power have a seriously effect on the data rate of on-off-keying non-line-of-sight ultraviolet communication.
Wax Appearance Temperature Measurement of Opaque Oil for Flow Assurance in Subsea Petroleum Production System
Lim, Jong-Se ; Back, Seung-Young ; Kang, Pan-Sang ; Yul, Seung-Ryul ; Kim, Hyo-Sang ; Park, Ji-Hong ;
Journal of the Korean Society of Marine Engineering, volume 36, issue 1, 2012, Pages 185~194
DOI : 10.5916/jkosme.2012.36.1.185
Deepwater oil is becoming more attractive because most onshore and shallow water oil is developing or developed. With the on-going trend to deepwater oil developments, flow assurance problems which prevent oil flow from reservoir to processing facilities are becoming an issue because deposited material can be occurred in case oil is exposed to very different environment from reservoir. Wax deposition which is one of flow assurance problems can be a major technical and economic issue because it is very sensitive to temperature. In order to predict and mitigate wax problems, the precise measurement of wax appearance temperature (WAT) which is the starting temperature of wax precipitation is very important. Various methods have been suggested for WAT measurement of opaque oil because there is no standard method for opaque oil. In this study, the WAT of opaque oil samples was measured using viscosity measurement method, differential scanning calorimetry, filter plugging method, and pressurized filter plugging method. Wax deposition test and high temperature gas chromatography analysis were applied to verify measured WAT. As a result of study, the WAT of opaque oils was successfully measured and verified. If WAT measurement methods of opaque oil related to oil characteristics is systematized using the results of this study, it can be a valuable tool for WAT measurement of opaque oil and flow assurance related to wax deposition.