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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
Crash survival analysis and tests for the capsule of voyage data recorder
Lee, Byoung-Ho ; Lee, Sock-Kyu ; Park, Suk-Hwan ; Choi, Ji-Ho ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 32~39
DOI : 10.5916/jkosme.2011.35.1.032
The purpose of VDR capsule is to maintain a stored information securely and retrievably in the extreme environment like voyage incident. This study shows the modellings, the analyses and the experiments of the survivability test of penetration, high and low temperature fire. The capsule housing is used to protect capsule against penetration and the influences of its thickness are studied by the modelling and analysis of penetration using LS-DYNA. The phase change material and thermal insulation material are used to protect capsule against high and low temperature fire test. The thermal characteristics of various volume ratios of phase change material to thermal insulation material were conducted. Also the tests were conducted to confirm the structural and thermal reliability.
A Study on the Characteristics of Refrigeration System Installed with Precooler, and Liquid-Vapor Separator after Expansion Device
Yun, Sang-Kook ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 40~45
DOI : 10.5916/jkosme.2011.35.1.040
The purpose of research is to understand the characteristics of refrigeration system having a liquid-vapor phase separator after expansion device and precooling heat exchanger. After expansion process of typical refrigerant of freezer, R134a, the cold vapor of the expanded refrigerant mixture is separated in the liquid-vapor separator and introduced in the precooling heat exchanger to enable the liquid refrigerant to be subcooled. The analysis results showed that the increasing rate of refrigeration capacity and COP can be 8.6% and 1.4%, each. The cause of these performance improvements is due to the difference of the slope of saturated vapor and saturated liquid lines in Mollier diagram of refrigerant.
A Study on the Improvement for Cycle Efficiency of Closed-type OTEC
Lee, Ho-Saeng ; Kim, Hyeon-Ju ; Jung, Dong-Ho ; Moon, Deok-Soo ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 46~52
DOI : 10.5916/jkosme.2011.35.1.046
A study on the improvement for cycle efficiency of closed-type ocean thermal energy conversion (OTEC) was studied to obtain the basic data for the optimal design of cycle. For that, OTEC cycle with a generator, a reheater and a multi-turbine was simulated and analyzed. The basic thermodynamic model for OTEC is Rankine cycle and the surface seawater of
and deep seawater of
were used for the heat source of evaporator and condenser, respectively. Ammonia is used as the working fluid. The cycle efficiency increased when generator is added with 0.9 generator effectiveness. When the reheater and multi-turbine are applied in the basic cycle, the cycle efficiency showed 3.14% and the capacity of heat exchanger decreased for same total cycle power. For the OTEC cycle with the generator, the reheater and the multi-turbine showed the highest cycle efficiency and increased the efficiency by more than 6.5% comparing with the basic OTEC cycle.
An Experimental Study on Spray Characteristics of Diesel and Bio-diesel Fuel
Kim, Jae-Duk ; Ainull, Ghurri ; Song, Kyu-Keun ; Jung, Jae-Yeon ; Kim, Hyung-Gon ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 53~59
DOI : 10.5916/jkosme.2011.35.1.053
The using of diesel engine will be increased in the world for fuel economy. But diesel engine emits harmful emissions such as much NOx, smoke etc. In this study, experiments were performed to investigate the spray characteristics of diesel spray in a common-rail system according to fuel temperature, injection pressure, injection period and fuel viscosity etc. using a high speed video camera. Diesel oil has different spray patten due to injection pressure and injection period in a common-rail system. A Filter pressure was influenced by fuel temperature which was turned to fuel viscosity related to a fluid flowing. The effect of the bio-diesel fuel mixing ratio on the spray and atomization characteristics was also investigated at various experimental conditions. It shows that the droplet atomization characteristics of bio-diesel fuel showed deteriorated results as the mixing ratio of biodiesel increased because of the high viscosity.
Experimental Study of the Robot Arm Applying the Gravity Compensator
Choi, Hyeung-Sik ; Seo, Hae-Yong ; Uhm, Tai-Woong ; Yoon, Jong-Su ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 60~67
DOI : 10.5916/jkosme.2011.35.1.060
In this paper, the structure of a gravity compensator(GC) was studied, and the 6-axis robot manipulator which is newly developed by applying the GC is presented to improve the torque performance and repeatability error of the robot joint. The kinematics analysis on the robot was presented. Also, experiments of the performance of the joint actuator of robot adopting the gravity compensator were presented by the GC to
joints of the robot arm. According to the experiment results, it was validated that the position errors and load torque of the robot joint actuator adopting the GC are reduced significantly.
Evaluation of Weldability on Identical and Dissimilar Welding Parts of Austenite Stainless Steel by GTAW
Han, Min-Su ; Park, Jae-Cheul ; Kim, Seong-Jong ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 68~74
DOI : 10.5916/jkosme.2011.35.1.068
This papers investigated the mechanical characteristics and the weldability of identical as well as dissimilar welding by GTAW for STS 304 and STS 316L. It is applied to double wall gas pipe of duel fuel engine for LNG carrier. Consequently, the weldability of dissimilar and identical welded zone of STS 304 decreased compared to base metal significantly. The result of microstructure observation for welded zone, a degree of acicular ferrite in welding zone for STS 304 presented more than STS 316L. The hardness of welding zone for STS 304 presented higher value than that for STS 316L by this effect.
Mechanical Properties and Microstructure on Dissimilar Friction-Stir-Weld of Aluminium Alloys
Han, Min-Su ; Jang, Seok-Ki ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 75~81
DOI : 10.5916/jkosme.2011.35.1.075
Dissimilar joining of aluminum 6061-T6 alloy to aluminum 5083-O alloy was performed using friction-stir welding technique. The mechanical properties, hardness, macro- and micro-structure on dissimilar friction-stir-weld aluminium alloy were investigated. Mechanical properties of the weld mainly depend on which Al alloy is placed at the retreating sides of the rotating tool respectively during dissimilar friction-stir weld because the microstructure of stir zone was mainly composed of welded Al alloys of the retreating side. Onion ring pattern was observed like lamella structure stacked by each Al alloy in turn. It apparently results in defect-free weld zone that traverse speed was changed to 124 mm/min under conditions of tool rotation speed like 1250 rpm with 5 mm of tool`s prove diameter, 4.5 mm of prove length, 20 mm of shoulder diameter, and
of tilting angle. The 231 MPa of ultimate stress and the 121 MPa of yield point are obtained about the friction-stir-welded Al 6061-T6(AS) to Al 5083-O(RS).
Evaluation of Turbulent Flame Speed Model for Turbulent Premixed Combustion Flow around Bluff Body
Park, Nam-Seob ; Ko, Sang-Cheol ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 82~88
DOI : 10.5916/jkosme.2011.35.1.082
The objective of this study is to investigate the validity of the dynamic sub-grid G-equation model to a complex turbulent premixed combustion such as bluff body stabilized turbulent premixed flames for the considering of the realistic engineering application. In this study, a new turbulent flame speed model, introduced by the sub-grid turbulent diffusivity and the flame thickness, is also proposed and is compared with an usual model using sub-grid turbulent intensity and with the experimental data. The calculated results can predict the velocity and temperature of the combustion flow in good agreement with the experiment data.
A Study on Flow Characteristics Behind the Bluff Body Using the PIV
Choe, Sang-Bom ; Cho, Dae-Hwan ; Choi, Joo-Yol ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 89~95
DOI : 10.5916/jkosme.2011.35.1.089
In this study, We modeled the deck house of the container ship like the representative bluff body and made the model ship. By using the PIV technique, the exhaust gas anti-reflux effect of the deck house backward according to open and close of the Sunken Deck and installation of the deflector in deck house side were measured in circulating water channel. The experiment system consists of hi-speed camera, laser, image board, host computer. The mean velocity vector and time mean axial velocity were found in deck house backward and the results were compared each case.
Software Development for the Performance Evaluation and Blade Design of a HACT by BEMT
Mo, Jang-Oh ; Kim, Mann-Eung ; Hyun, Beom-Soo ; Kim, You-Taek ; Oh, Cheol ; Lee, Young-Ho ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 96~101
DOI : 10.5916/jkosme.2011.35.1.096
In this study, we have established the design techniques, with which we can design and evaluate performance of blades on a horizontal axis current turbine, by application of blade element momentum theory considering the blade tip`s loss model, and finally developed the domestic software(MCT-blade V2.0). We have designed and evaluated performance of blades for the 2MW class by using of the software, and confirmed its calculation results from BEMT by comparing those results from commercial code of ANSYS FLUENT. In a state of rated velocity 2.5m/s, the mechanical power from BEMT is calculated as 2,121kW, which is considered to satisfy the electrical power, but the value from CFD is calculated as 1,901kW, which is considered a little deficient for the target output.
Implementation of CAN-based Visible LED Communication Systems
Sohn, Kyung-Rak ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 102~107
DOI : 10.5916/jkosme.2011.35.1.102
LED-based lighting motivated by significant energy savings provides an opportunistic development of widespread free-space optical communications. Their transceivers have a variety of competitive advantages over RF including high bandwidth density, reliability, lower energy consumption, and long lifetime. But, it is difficult for existing buildings and structures such as ships and vehicles to install the communication cable to the ceiling. In this paper, controller area network (CAN)-based LED lighting communication systems were proposed. Results indicate the viability of developing inexpensive CAN interface modules and transceivers might be embedded in lighting products to support the indoor wireless networking.
Hydraulic Characteristics of Train Carriage Artificial Reef in Wave and Current Field Conditions
Sohn, Byung-Kyu ; Yi, Byung-Ho ; Yoon, Han-Sam ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 108~117
DOI : 10.5916/jkosme.2011.35.1.108
Old train carriages have been used to create artificial reefs (AR) as part of programs to enhance ocean fisheries and recreational resources. This study conducted hydraulic modeling experiments to estimate the structural stability of a train carriage AR. By applying fixed- and movable-bed conditions and Froude similitude, theoretical and hydraulic experiments revealed major design forces(e.g., water waves and currents). The results of this study showed that some dimensionless design parameters (e.g., surf similarity parameters, water particle velocity, scouring, and deposition) also affect the stability of an AR under various wave and current field conditions. In the fixed-bed condition, movement of the AR occurred when dimensionless water particle velocity based on the surf similarity parameter was larger than about 0.32. In the moveable-bed condition, the settlement depth (field values) of the AR ranged from 6 to 30 cm. The results indicated that characteristics of the sediment/bed condition and the direction of external forces acting on an AR should be considered when selecting AR sites.
A Study on the Necessity of Introduction of Scientific Diver Certification System in Korea
Kang, Sin-Young ; Kim, Ho-Sang ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 118~125
DOI : 10.5916/jkosme.2011.35.1.118
Currently, in Korea the scientific diving activity is being conducted without any legal basis, thus confusions arise in work coverage, equipment usage, and wage calculation etc. In this paper, introduction of scientific diver certification system is suggested to clear such confusions and to enhance the safety of scientific divers. Also the codes and regulations of foreign countries were introduced, and from the analysis of scientific diving tasks and applying skills, the hostility of the scientific diver`s working environment as well as requirement of high level diving skills are explained. Finally the necessity of establishment of scientific diving regulation and introduction of diver certification system were emphasized and the promotion plan was discussed.
A Study on Tidal Current Energy in the Sea near Wando
Yang, Chang-Jo ;
Journal of the Korean Society of Marine Engineering, volume 35, issue 1, 2011, Pages 126~132
DOI : 10.5916/jkosme.2011.35.1.126
With the worldwide trend of controlling the utilization fossil fuels inducing global climate change, many efforts will have to be made on securing stable supply of the energy due to UNFCCC. Tidal currents are a concentrated form of gravitational energy. Tidal current resource is significant, but limited locations. Technical and economic feasibility demonstration is the next needed step in the technology development process. So, we investigated overview of tidal in-stream energy in the sea near Wando, and then analytically estimated tidal energy resources and annual energy output of TECS arrays.