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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 33, Issue 8 - Nov 2009
Volume 33, Issue 7 - Nov 2009
Volume 33, Issue 6 - Sep 2009
Volume 33, Issue 5 - Jul 2009
Volume 33, Issue 4 - May 2009
Volume 33, Issue 3 - May 2009
Volume 33, Issue 2 - Mar 2009
Volume 33, Issue 1 - Jan 2009
Selecting the target year
A Study on a Gravity Compensator for the Robot Arm
Choi, Hyeung-Sik ; Kim, Dong-Ho ; Her, Jea-Gwan ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 226~232
DOI : 10.5916/jkosme.2009.33.2.226
In this paper, a design and analysis of a gravity compensator which is a new device to reduce the joint torque of robots caused due to gravity is presented. Joints of all robots are loaded by large torques due to gravity. By applying the gravity compensator to the robot joints, the load torques applied to the robot joints are reduced by the repulsive force of the gravity compensator such that the size of the joint actuation motor can be reduced. In this paper, the structure and force relation of the gravity compensator are analyzed. The superior performance of the proposed gravity compensator is verified through experiments which measure the joint motor current caused by the load applied to the robot link.
Performance and Safety Analysis of Marine Solid Oxide Fuel Cell Power System
Kim, Myoung-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 233~243
DOI : 10.5916/jkosme.2009.33.2.233
The strengthened regulations for atmospheric emissions from ships like MARPOL Annex VI have caused a necessity of new, alternative power system in ships for the low pollutant emissions and the high energy efficiency. This paper attempts to investigate the configuration of SOFC system for LNG tanker taking into account the safety and to analyze the influence of design parameters on the system performance. The simulation results provide the basic data for the design and efficiency improvement of SOFC system and indicate the guidelines for the safe system operation.
Heat Transfer and Pressure Drop Characteristics of a Horizontal Channel Filled with Porous Media
Son, Young-Seok ; Shin, Jee-Young ; Cho, Young-Il ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 244~251
DOI : 10.5916/jkosme.2009.33.2.244
Porous media have especially large surface area per volume, which contain complex fluid passage. If porous media can be applied to cool a CPU or an electronic device with large heat dissipation, it could result in heat transfer enhancement due to the enlargement of the heat transfer area and the flow disturbance. This study is aimed to identify the heat transfer and pressure drop characteristics of high-porosity metal foams in a horizontal channel. Experiment is performed with the various heat flux, velocity and pore density conditions. Permeabilities, which is deduced from Non-Darcy flow model, become lower with increasing pore density. Nusselt number also decreases with higher pore density. High pore density with same porosity case shows higher pressure loss due to the increase of surface area per unit volume. The fiction factor decreases rapidly with increase of Reynolds number in Darcy flow region. However, it converges to a constant value of the Ergun coefficient in Non-Darcy flow region.
Combustion and Emission Characteristics of Biodiesel Fuel in a Common Rail Diesel Engines
Zhang, Yue-Qiu ; Wang, Jianxin ; Cho, Haeng-Muk ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 252~258
DOI : 10.5916/jkosme.2009.33.2.252
Engine bench tests has been done on a common-rail diesel engine with bio-diesel fuel to study effects of B100 and B20 on output power, fuel consumption and emissions. Test results show that B100 and B20 could reduce PM, HC, CO emission and smoke, but power decrease, fuel consumption increase and NOx increase obviously, B100 reduce PM and DS with
compared with diesel fuel, while B20 reduce PM and DS with
. NOx of B100 and B20 increase
compare to diesel.
Behavior of the Coherent Structure on the Attached Forced Flame
Kim, Dae-Won ; Lee, Kee-Man ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 259~266
DOI : 10.5916/jkosme.2009.33.2.259
An experimental study was conducted to investigate the effects of forcing amplitude on the flow structure near the nozzle exit of forced jet diffusion flames. The jet was excited up to the blowout occurrence by a considerable large amplitude with a periodic velocity fluctuation at the tube resonating frequency. In the attached flame regime, we disclosed the very interesting result newly that adding of a moderate forcing amplitude caused the jet flame to become longer in spite of being forced. Particular attention is focused on the turnabout mechanism of vortex roll-up around the elongated flame, which has not been reported previously, and on the inner coherent structure of the forced jet in the attached flame regime. From the velocity and flow visualization results, it was ascertained that the surrounding air due to the occurrence of negative velocity parts was suck into the fuel nozzle. To aid in understanding the rotating phenomenon of coherent structure, we present a schematic diagram of the turnabout mechanism of vortex roll-up. The mechanism of vortex turnabout phenomenon can be easily understood by considering the positive and negative velocity amplitudes about the instantaneous velocity of the forcing flow, as shown in this diagram.
An Experimental Study of N
O Concentration Profiles in Planner Premixed Flame
An, Suk-Heon ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 267~271
DOI : 10.5916/jkosme.2009.33.2.267
The Marine Environment Protection Committee(MEPC) which is the IMO's specialized committee on marine pollution related matters deals with GHG related issues to discuss and compile possible approaches on technical, operational and market based measures to address GHG emissions from ships. The nitrous oxide(
) which remains generally in the atmosphere for around 114 years is one of the green house gases. The global warming potential of
is 310 times than
in the given period 100 years. It seems that the
formation is influenced by the nitrogen compound contained in the fuel which is named as "Fuel N" during the combustion process or the NOx, SOx and
through the emission gases before exhausted into the atmosphere. This paper has carried out an experimental study of the
concentration profiles by the change of
flows in the planner premixed combustion with using
An Experimental Study on Swirling Flow in a Sudden Expansion Tube using 3D PIV Technique
Chang, Tae-Hyun ; Kil, Sang-Cheol ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 272~281
DOI : 10.5916/jkosme.2009.33.2.272
The effect of swirl on the flow characteristics in a sudden expansion tube was examined experimentally by using 3D PIV(particle image velocimetry) to capture the velocity profiles. The swirling flow of water through a sudden 1:2 axisymmetric expansion has previously been studied experimentally within a horizontal round tube. A kind of tangential slot is used as a swirl generator for swirling flow and a honey comb is used for without swirl flow. The work with the swirl and without swirl results are compared to each other at the same Reynolds number. Liquid crystal was employed to measure temperature profiles and heating coil used for heat transfer with and without swirl flow. And then the Nusselt number ratoes(Nu/Nudb) are calculated along the test section.
Filtering System Design and Structural Analysis for Intake Water of Ship's Ballast Tank
Yun, Sang-Kook ; Park, Byung-Geun ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 282~287
DOI : 10.5916/jkosme.2009.33.2.282
As current international guideline and IMO regulation give severe restrictions for ships to manage ballast water to reduce unintentional organism transfers, several ballast water treatment systems recently have been being developed together with filtration. That is because discharging ballast water from ships causes many pollutions by foreign biological invasive species. The primary treatment system being considered in this study was based on fine screen filtration technology applied to ballast water filter in ballast tank in order to reduce the load of ballast water treatment system. New ballast water filtration system was invented and analysed. The structural stress and strain analysis for ballast filtration systems which are current and invented filters were carried out using UGS and Ansys. The results showed that the structure of current filtering module was not designed to meet the requirement of sea water filtration during ballasting operation. The studies also showed that the invented design of filtration system equipped with back washing and automatic scrapper for eliminating cake of bio-species might be a potentially effective technology for ballast water management of ship's ballast tank.
A Study on Processing of Monolithic Rack Housing for Modular Steering Gear [II] - Processing Characteristics of Monolithic Rack Housing -
Kim, Jong-Do ; Lee, Chang-Je ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 288~294
DOI : 10.5916/jkosme.2009.33.2.288
The purpose of this study is manufacturing of monolithic housing for modularization of steering gear. Monolithic housing is difficult to weld with only rotation and linear motion. It is for this reason that housing of joining parts have a slope of 76.3 degrees. For this reason, welding trajectory was measured by the cooperative controled robot system, and then allowing for measured results, we developed the dedicated system. The developed system can be welded by using only 3 axises in contrast with robot system using 8 axises in housing welding. In addition, we applied CMT and laser welding device to dedicated system and as a result of experiment, sound bead and excellent roundness could be obtained.
The Study for Cold Forging of Spline with Different Friction Factor on Die Surface
Kim, Kwan-Woo ; Lee, Seok-Jin ; Kim, Moon-Ki ; Cho, Seong-Yeol ; Cho, Hae-Yong ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 295~303
DOI : 10.5916/jkosme.2009.33.2.295
Forging of square spline was investigated by using finite element methods in this study. Spline is widely used by torque transmitter in the fields of automobile, aircraft, and shipping etc. Friction on the surface of die is regarded as the most important factor to improve the dimensional accuracy for complete forming of spline teeth. Finite element simulation was carried out to improve the formability of the spline, especially remove unnecessary burrs which were extruded in gap between the die and the punch. To remove the burrs, various friction factors are considered on the surfaces of the die in the simulations and punch flat surface was designed. The simulated results were compared with experimental ones. As a results, it is possible to control the growth of burrs and improve formability of spline teeth by applying various friction factors and design of punch flat surface.
Development of a 3D CAD Program for Standard Parts and Mold Base of Injection Mold Using Pro/ENGINEER
Pack, Pil-Ju ; Kim, Kwan-Woo ; Kim, Jong-Won ; Han, Ki-Beom ; Lee, Hyeon-Chul ; Cho, Hae-Yong ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 304~312
DOI : 10.5916/jkosme.2009.33.2.304
Automated design system of injection mold was developed in this study. Shapes of mold parts and mold base were defined according to standards of mold components and database modules of mold components were built. And then an automation program of mold design was developed by the user definition features, family table and Pro/Program of Pro/Engineer. The automatic production divided into mold base and standard parts was manipulated to manufacture parts meeting the design requirements and the selected parts were changed in size and shape to meet the design goals. The mold design was also carried out to have organic relations and be easy in case of a change to the mold part or mold base. As a result, it is possible to design the mold efficiently and conveniently modify the designed mold parts and base by using the developed automated design system in this study.
Mechanical and Electrochemical Characteristics in Welding with Robot on 6061-T6 Al Alloy for Al Ship
Kim, Seong-Jong ; Jang, Seok-Ki ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 313~321
DOI : 10.5916/jkosme.2009.33.2.313
The construction of fiber-reinforced plastic (FRP) boats is decreasing trend since the application of international regulations on the control of marine environmental pollution, which recommended the use of environmentally friendly materials. The aluminum alloy used with material for ship is a superior to FRP. It is environmental friendly, easy to recycle, and provides a high added value to fishing boats. However, the welding for Al alloy materials have many problems, such as deformation by welding heat and effect of the working environment. In this paper, it was carried out welding by robot with welding material of ER5183 and ER5556 on 6061-T6 Al alloy for ship. The mechanical and electrochemical characteristics evaluated for specimen welded by robot. The cathodic polarization trend for the base metal and welding metal showed the effects of concentration polarization due to oxygen reduction and activation polarization due to hydrogen generation. The hardnesses of welding zone and heat affected zone are lower than that of base metal. At the result of tensile test, the specimen welded with ER5183 presented excellent property compared with ER5556.
The Basic Study on Machinability of Ceramics in CO
Laser Assisted Machining
Kim, Jong-Do ; Lee, Su-Jin ; Park, Seo-Jeong ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 322~329
DOI : 10.5916/jkosme.2009.33.2.322
Machinability of LAM(Laser Assisted Machining) has been studied for ceramics such as
laser. It was possible to remove ceramics by PCBN tool because material became softening and deterioration by local laser beam irradiation. The advantage of LAM is the ability to produce larger material removal rates and tool life. But, for cutting of
, stage of laser power control was needed owing to thermal shock with high temperature of workpiece by laser power. And when
was machined by LAM,
gas spouted from surface of one cause of high temperature. Characteristics of LAM were analyzed using pyrometer, dynamometer, SEM and EDS to measure temperature of workpiece surface, cutting force, variation of machining surface and structure of lattice respectively. As the result of this study, it was found that machinability of LAM for ceramics in
laser and mechanism of LAM was different according to the kind of ceramics because of properties of materials.
A Study on the Tank Liquid-Level Monitoring Sensor Systems for Large Scaled Vessels
Sohn, Kyung-Rak ; Kim, Jin-Wook ; Cho, Seok-Je ; Shim, Joon-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 330~335
DOI : 10.5916/jkosme.2009.33.2.330
A fiber-optic liquid level sensor based on bending cantilever beam has been proposed. A fiber Bragg grating(FBG) embedded in the cantilever beam is used to sensing elements. The basic concept is elongation and constriction of the FBG corresponding to the liquid level variation. The best FBG position on the cantilever for obtaining the high sensitivity was 4 cm from the fixing point. When the liquid level moves up and down vertically, the Bragg wavelength is linearly shifted. But, the wavelength sensitivity of the FBG installed on the upper side of cantilever was four times better than that of the FBG equipped in the lateral side due to the difference of unit strain applied to the FBG. Intensity demodulation using the low-cost edge filter is used to interrogate the Bragg wavelength through converting the wavelength signals into the optical intensity ones. Experiment results show that the electrical output is exponentially proportional to the liquid level. But, it should be overcome for applying to the ships.
A Case Study on the Passengers' Evacuation Times according to the Fire Smoke Density On a Ship
Hwang, Kwang-Il ; Shin, Dong-Keol ; Kim, You-Jin ; Youn, Jeong-Ha ; Lee, Sang-Il ; Hong, Won-Hwa ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 336~343
DOI : 10.5916/jkosme.2009.33.2.336
Because ships are very isolated and independent objects when sailing on the ocean, if a fire and smoke occurs, nobody can be sure to escape safely from ship at the moment. On the focus of the relationship between the sight transmissivity by fire smoke density and the life safety, this study performs simulations and experiments, respectively. To evaluate the theoretical evacuation time, CFAST software which is known as a 2 zone model analysis tool is used, and the result is 54 seconds from ECR(Engine Control Room) exit to upper deck exit and 34 seconds from bosun store to upper deck exit. And totally 12 types of experiments are performed with other 10 persons per experiment. As the result, it is cleared that the low sight transmissivity leads to the low life safety and the obstruction which can be happen unexpectedly on the evacuation way on fire makes it worse. At the condition of the smoke density 0%, over 90% people arrive at upper deck exit safely. But with the transmissivity of 8%, 70%(from ECR) and 30%(from bosun store) among experiment persons of each can survive, and with same density and unexpected obstruction, the survival ratio goes down to only 20% and 10%.
Digital Image Processing of Side Scan Sonar for Underwater Man-made Structure
Shin, Sung-Ryul ; Lim, Min-Hyuk ; Kim, Kwang-Eun ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 344~354
DOI : 10.5916/jkosme.2009.33.2.344
Side scan sonar using acoustic wave plays a very important role in the underwater, sea floor, and shallow marine geologic survey. In this study, we have acquired side scan sonar data for the underwater man-made structures, artificial reefs and fishing grounds, installed and distributed in the survey area. We applied digital image processing techniques to side scan sonar data in order to improve and enhance an image quality. We carried out digital image processing with various kinds of filtering in spatial domain and frequency domain. We tested filtering parameters such as kernel size, differential operator, and statistical value. We could easily estimate the conditions, distribution and environment of artificial structures through the interpretation of side scan sonar.
Numerical Analysis on Offshore Wind Power System Foundation
Kim, Dong-Ho ; Jang, Won-Yil ; Kim, Seong-Yun ; Shin, Sung-Ryul ; Lim, Jong-Se ; Yoon, Ji-Ho ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 355~361
DOI : 10.5916/jkosme.2009.33.2.355
Onshore wind farms having several problems, difficult to secure a building site and incur the enmity of the people. Therefore, offshore wind farms are increasingly expected, because there are huge resource and large site in offshore. If huge wind turbines are constructed, the offshore wind power base is concerned about subsidence. In order to confirm the ground stability, estimation of subsidence is necessary. In this paper, the subsidence is predicted by continuity model when the gravity and the mono-pile base are constructed on soft ground. The FLAC 3D, three dimensional FDM program, was adopted to analysis subsidence. Input factors are yielded by geological information at the yeompo quay in ulsan and the results of laboratory experiments. It has been compared that the original ground with improved ground under the gravity base, and constructed mono-pile under the mono-pile base.
The Evaluation Ship Safety by Formal Safety Assessment
Kim, Jong-Ho ;
Journal of the Korean Society of Marine Engineering, volume 33, issue 2, 2009, Pages 362~367
DOI : 10.5916/jkosme.2009.33.2.362
Formal Safety Assessment(FSA) was introduced by the IMO as "a rational and systematic process for accessing the risk related to maritime safety and the protection of the marine environment and for evaluating the costs and benefit of IMO's options for reducing these risks". FSA can be used as a tool or a rule making process to help develope new rules and regulations. The purpose of this paper is to conduct a general review of the FSA methodology and to propose ways to use it in rule making process of machinery parts.