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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 37, Issue 8 - Nov 2013
Volume 37, Issue 7 - Nov 2013
Volume 37, Issue 6 - Sep 2013
Volume 37, Issue 5 - Jul 2013
Volume 37, Issue 4 - May 2013
Volume 37, Issue 3 - May 2013
Volume 37, Issue 2 - Mar 2013
Volume 37, Issue 1 - Jan 2013
Selecting the target year
A numerical study on soot formation in ethylene diffusion flames under 1g and 0g
Choi, Jae-Hyuk ; Park, Sang-Kyun ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 807~815
DOI : 10.5916/jkosme.2013.37.8.807
A numerical study on soot formation in a laminar ethylene diffusion flame at atmospheric pressure was conducted to obtain a better understanding of the effects of buoyancy on sooting flames under 0g and 1g using a gas-phase reaction mechanism and thermal and transport properties. A simple model was employed to predict soot formation, growth and oxidation with interactions between the gas phase chemistry and the soot chemistry taken into account. Results showed that the flames in 0g are much wider than that of 1g because of the thicker diffusion layer and reduction in axial velocity. The reduction in the axial velocity in 0g results in longer residence times, and resulting in greatly enhanced soot volume fraction. And, under zero-gravity, due to the lack of a buoyancy-induced instability, flame instability disappears.
Numerical study on the thermal performance of passively cooled hybrid fins
Jeon, Mun Soo ; Kim, Kyoung Joon ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 816~821
DOI : 10.5916/jkosme.2013.37.8.816
This paper reports numerical study results with respect to the thermal performance of various hybrid fins (HFs) and a pin fin (PF) passively cooled under natural convection state. Investigated HFs are a basic hybrid fin (BHF), a hollow hybrid fin (HHF), and a solid hybrid fin (SHF). CFD models for both HFs and the PF have been developed to explore their thermal performance under various heat dissipations. Thermal performances of fins have been analyzed by quantifying array-based heat transfer coefficients,
, and mass-based heat transfer coefficients,
, for each fin. Study results show that
of the SHF is 23% greater than that of the PF.
of the HHF is found to be even 140% greater than that of the PF, and the HHF is found to be 40% better than the BHF in terms of the mass-based performance,
A study on temperature characteristic of the gases supplied to SOFC system by utilizing the ship exhaust gas
Park, Sang-Kyun ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 822~828
DOI : 10.5916/jkosme.2013.37.8.822
Since the operating temperature of Solid Oxide Fuel Cell (SOFC) is high, the heat management of the gases supplied to fuel cell system is important. In this paper, the temperature characteristic of the gases supplied to the anode and the cathode of the fuel cell is studied in case of utilizing the waste heat contained in the ship exhaust gas as a heat source to heat up the fuel, gas and water supplied to a 500kW SOFC system for a ship power. For the fuel cell system proposed in this paper, the temperature of gases supplied to the anode and the cathode was the highest temperature at 963K when the exhaust gas of the fuel cell was utilized as the heat source for gases supplied to fuel cell system instead of utilizing the ship exhaust gas. In addition, the engine power did not effect on the temperature of gases supplied to the fuel cell stack.
Exergy analysis of R717 high-efficiency OTEC cycle
Yoon, Jung-In ; Son, Chang-Hyo ; Yang, Dong-Il ; Kim, Hyeon-Uk ; Kim, Hyeon-Ju ; Lee, Ho-Saeng ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 829~835
DOI : 10.5916/jkosme.2013.37.8.829
This paper describes an analysis on exergy efficiency of proposed high-efficiency R717 OTEC power system to optimize the design for the operating parameters of this system. The operating parameters considered in this study include outlet pressure in an evaporator and high turbine, inlet pressure condenser and vapor quality at cooler outlet, respectively. The main results are summarized as follows : As the outlet pressure in an evaporator and vapor quality at cooler outlet of R717 OTEC power system increases, the exergy efficiency of this system increases, respectively. But outlet pressure in the high turbine, inlet pressure in the condenser of R717 OTEC power system increases, the exergy efficiency of this system decreases, respectively. And, incase of exergy efficiency of this OTEC system, the effect of inlet pressure in an evaporator and outlet pressure in the high turbine on R717 OTEC power system is the largest and the lowest among operation parameters, respectively.
Performance analysis of 20 kW OTEC power cycle using various working fluids
Yoon, Jung In ; Ye, Byung Hyo ; Heo, Jung Ho ; Kim, Hyun Ju ; Lee, Ho Saeng ; Son, Chang Hyo ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 836~842
DOI : 10.5916/jkosme.2013.37.8.836
In this paper, the 20 kW Ocean Thermal Energy Conversion(OTEC) is newly proposed in order to select the refrigerant that makes the cycle performance be optimized and the performance of 20 kW OTEC applying 15 pure refrigerants and 16 mixed refrigerants is analyzed. The efficiency of system, the mass flow of working fluids and TPP, which is new concepts, are analyzed. In view of cycle efficiency, R32/R152a (87:13) is the highest efficiency among the refrigerants. At the mass flow of working fluid to make the 20 kW electricity, R717 is shown as the lowest value. And in view of TPP in this study, R32/R134a 70:30 is the most optimized refrigerant. The analysis can confirm that the refrigerant is different along with the part of the system, so it is necessary to select the optimized refrigerant for 20 kW OTEC.
Study on the characteristics of perlite insulation for the storage tank in LNG carrier
Yun, Sangkook ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 843~848
DOI : 10.5916/jkosme.2013.37.8.843
As the LNG demands are growing, the constructions of LNG FPSO (Floating Production Storage and Off-loading) and LNG carriers have been constantly increased, and the various design of storage tank has been tried. This paper propose that the material of inner storage tanks is made of 5~9% Ni steel plate and perlite powder insulation instead of urethane foam block. It needs essentially to obtain the proper design specifications that are the pressure of perlite, the characteristics of resilient blanket as the pressure absorber, optimum thickness of blanket and design pressure of tank wall, etc. to enable the perlite insulation system to LNG carrier, The results show that the design thickness of blanket should be between 1/4 to 1/3 of insulation width and the optimum rate becomes 30%, and the design pressure be applied below 1,500 Pa with blanket thickness.
Comparison of characteristics between cam and electric control type of 2 stroke diesel engine for ship propulsion
Lee, Sang Deuk ; Jung, Suk Ho ; Koh, Dae Kwon ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 849~854
DOI : 10.5916/jkosme.2013.37.8.849
Many researches on green ship with increasing on economics, efficiency and convenience have been carried out consistently. One of them is development of diesel engines with electronic control. While small duty one for automobiles had been adopted mainly already, disseminating heavy duty one for ships has trouble due to safety and reliability. In order to solve these problem in this study, performance of electronic control and cam type engine installed in parallel on training ship HANBADA of korea maritime university was analyzed and compared. It is certain that specific fuel oil consumption of the electronic control type is lower than cam type and excellent at lower engine load, especially. And the electronic control type shows more effective characteristic at sea trial on specific fuel oil consumption.
A study of NOx performance for Cu-chabazite SCR catalysts by Sulfur poisoning and desulfation
Nam, Jeong-Gil ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 855~861
DOI : 10.5916/jkosme.2013.37.8.855
Small-pore Cu-chabazite SCR catalysts with high NOx conversion at low temperatures are of interest for marine diesel engines with exhaust temperatures in the range of 150 to
. Unfortunately, fuels for marine diesel engines can contain a high level of sulfur of up to 1.5% by volume, which corresponds to a
level of 500 ppm in the exhaust gases for an engine operating with an A/F ratio of 50:1. This high level of
in the exhaust may have detrimental effects on the NOx performance of the Cu-chabazite SCR catalysts. In the present study, a bench-flow reactor is used to investigate the effects of sulfur poisoning on the NOx performance of Cu-chabazite SCR catalysts. The SCR catalysts were exposed to simulated diesel exhaust gas stream consisted of 500 ppm
as the balance gas at 150, 200, 250 and
for 2 hours at a GHSV of 30,000
. After sulfur poisoning the low-temperature NOx performance of the SCR catalyst is evaluated over a temperature range of 150-
to determine the extent of the catalyst deactivation. Desulfation is also carried out at 600 and
for 30 minutes to determine whether it is possible to recover the NOx performance of the sulfur-poisoned SCR Catalysts.
Evaluation of tensile strengths and fracture toughness of plain weave composites
Park, Soon-Cheol ; Kang, Sung-Su ; Kim, Gug-Yong ; Choi, Jung-Hun ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 862~868
DOI : 10.5916/jkosme.2013.37.8.862
The mechanics of woven fabric-based laminated composites is complex. Then, many researchers have studied woven fabric CFRP materials but fracture resistance behaviors for composites have not been still standardized. It also shows the different behavior according to load and fiber direction. Therefore, there is a need to consider fracture resistance behavior in conformity with load and fiber direction at designing structure using woven CFRP materials. In this study, therefore, the tensile strength and resistance for plain-weave CFRP composite materials were investigated under various different angle condition(load to fiber angle:
). Tensile strength and fracture toughness tests were carried out under mode I transverse crack opening load by using compact tension specimens.
The prediction of fatigue life of muffler by artificial neural network
Park, Soon-Cheol ; Kang, Sung-Su ; Yoon, Jin-Ho ; Kim, Gug-Yong ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 869~876
DOI : 10.5916/jkosme.2013.37.8.869
In order to estimate the fatigue life of mufflers at the early stage of researches and designs, the new prediction process was developed by the artificial neural network, which has the algorism of weldment properties. Bending fatigue test was carried out for defining the characteristics of muffler weldment fatigue life and damage. For considering and predicting mechanical and fatigue properties of the muffler, the maximum stress of weldment was adapted as the variable of artificial neural network training. Also, it was compared with the fatigue life predicting results using fatigue notch factors, for proving the newly developed process of the artificial neural network.
Evaluation of the corrosion property on the welded zone of seawater pipe by A.C shielded metal arc welding
Jeong, Jae-Hyun ; Kim, Yun-Hae ; Moon, Kyung-Man ; Lee, Myeong-Hoon ; Kim, Jin-Gyeong ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 877~885
DOI : 10.5916/jkosme.2013.37.8.877
A seawater pipe of the engine room in the ships is being surrounded with severely corrosive environments caused by fast flowing of the seawater, containing aggressive chloride ion and high conductivity etc.. Therefore, the leakage of the seawater from its pipe have been often occurred due to its local corrosion by aggressive chloride ions. Subsequently, its leakage area is usually welded by AC shielded metal arc welding with various electrodes. In this study, when the sea water pipe is welded with several types of electrodes such as E4301, E4311, E4313 and E4316, a difference of the corrosion resistance on the welding metal zones was investigated using an electrochemical method, observing microstructure, measuring polarization behaviors and hardness. The weld metal zone welded with E4313 electrode exhibited the lowest value of hardness compared to other weld metal zones. In addition, its zone indicated also the best corrosion resistance than those of other weld metal zones. Furthermore, all of the weld metal zones revealed a relatively better corrosion resistance than those of the base metal zones. and also showed higher hardness than the base metal zones.
Study of the high pressure hose assemblies by accelerated life test
Lee, Gi Chun ; Lee, Yong Bum ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 886~892
DOI : 10.5916/jkosme.2013.37.8.886
Hydraulic hose assemblies are used as piping components for construction machinery, automobile, aircraft, industrial machinery, machine tools, and machinery for ships. Then the reliability of hose assemblies is important because total hydraulic system, which used to deliver the fluid power (
) needed to flexibility in the piping system, is not operated if the hose assembly failed in the system. The data of the accelerated life test estimated through the shape parameter(
) resulting of the Weibull distribution analysis. This study has tried to reduce the test time resulting from varying impulse pressure range and the flexing diameter. Accelerated life test model for the test results was adopted the GLL(generalized log linear) and the accelerated indexes are identified as 6.64 for the pressure and 4.46 for flexing radius. Also, it found that shape parameter is 6.19, scale parameter(
, which were adopted the pressure 35 MPa and the flexing diameter R100 mm in the used condition.
Multiobjective optimization strategy based on kriging metamodel and its application to design of axial piston pumps
Jeong, Jong Hyun ; Baek, Seok Heum ; Suh, Yong Kweon ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 893~904
DOI : 10.5916/jkosme.2013.37.8.893
In this paper, a Kriging metamodel-based multi-objective optimization strategy in conjunction with an NSGA-II(non-dominated sorted genetic algorithm-II) has been employed to optimize the valve-plate shape of the axial piston pump utilizing 3D CFD simulations. The optimization process for minimum pressure ripple and maximum pump efficiency is composed of two steps; (1) CFD simulation of the piston pump operation with various combination of six parameters selected based on the optimization principle, and (2) applying a multi-objective optimization approach based on the NSGA-II using the CFD data set to evaluate the Pareto front. Our exploration shows that we can choose an optimal trade-off solution combination to reach a target efficiency of the axial piston pump with minimum pressure ripple.
Numerical analysis of turbulent flows in the helically coiled pipes of heat transfer
Kwag, Seung-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 905~910
DOI : 10.5916/jkosme.2013.37.8.905
The flow analysis has been made by applying the turbulent models in the helically coiled tubes of heat transfer. The k-
and Spalart-Allmaras turbulent models are used in which the structured grid is applied for the simulation. The velocity vector, the pressure contour, the change of residuals along the iteration number and the friction factors are simulated by solving the Navier-Stokes equations to make clear the Reynolds number effect. The helical tube increases the centrifugal forces by which the wall shear stress become larger on the outer side of the tube. The centrifugal force makes the heat transfer rate locally larger due to the increase of the flow energy, which finds out the close relationship between the pressure drop and friction factor in the internal flow. The present numerical results are compared with others, for example, in the value of friction factor for validation.
A study on power improvement emission characteristics of marine diesel engine with response power 220HP turbocharger
Lee, Chi-Woo ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 911~917
DOI : 10.5916/jkosme.2013.37.8.911
This is a thesis about the experiment of comparison characteristic of power and exhaust gas in the same condition between diesel engine that is equipped response power 220HP turbocharger to increase effectiveness of the engine which is recently used in a lot of industry which requires high power. Resulting of the experiment with natural aspiration diesel engine and turbocharger diesel engine, difference in low speed is not significant, but in high speed, effectiveness of turbocharger diesel engine is much higher than the other one. In other hand, in exhaust gas experiment, turbocharger model exhausts more
, but it doesn't significantly affect the result when it comes with decreasing of
and effectiveness of increased power characteristic. As a result, the turbocharger diesel engine is economically effective comparing with the natural aspiration diesel engine.
Implementation of smart security CCTV system based on wireless sensor networks and GPS data
Yoon, Kyung-Hyo ; Park, Jin-Hong ; Kim, Jungjoon ; Seo, Dae-Hwa ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 918~931
DOI : 10.5916/jkosme.2013.37.8.918
The conventional object tracking techniques using PTZ camera detects object movements by analyzing acquired image. However, this technique requires expensive hardware devices to perform a complex image processing. And it is occasionally hard to detect object movements, if an acquired image is low quality or image acquisition is impossible. In this paper, we proposes a smart security CCTV system applying to wireless sensor network technique based on IEEE 802.15.4 standard to overcome the problems of conventional object tracking technique, which enables to track suspicious objects by detecting object movements and GPS data in sensor node. This system enables an efficient control of PTZ camera to observe a wide area, decreasing image processing complexity. Also, wireless sensor network is implemented using mesh networks to increase the efficiency of installing sensor node.
Indoor localization algorithm based on WLAN using modified database and selective operation
Seong, Ju-Hyeon ; Park, Jong-Sung ; Lee, Seung-Hee ; Seo, Dong-Hoan ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 932~938
DOI : 10.5916/jkosme.2013.37.8.932
Recently, the Fingerprint, which is one of the methods of indoor localization using WLAN, has been many studied owing to robustness about ranging error by the diffraction and refraction of radio waves. However, in the signal gathering process and comparison operation for the measured signals with the database, this method requires time consumption and computational complexity. In order to compensate for these problems, this paper presents, based on proposed modified database, WLAN indoor localization algorithm using selective operation of collected signal in real time. The proposed algorithm reduces the configuration time and the size of the data in the database through linear interpolation and thresholding according to the signal strength, the localization accuracy, while reducing the computational complexity, is maintained through selective operation of the signals which are measured in real time. The experimental results show that the accuracy of localization is improved to 17.8% and the computational complexity reduced to 46% compared to conventional Fingerprint in the corridor by using proposed algorithm.
Flashlamp discharge characteristics adopting the self resonance of transformer: main theory
Lee, Hee-Chang ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 939~945
DOI : 10.5916/jkosme.2013.37.8.939
Xenon flashlamp power supply for solid-state laser has a converter with high voltage conversion ratio. General model is composed of transformer with high voltage conversion ratio and voltage doubler rectifier circuit. The purpose of power supply leads dielectric breakdown of Xenon flashlamp and passes current rapidly. When it is passing through the current, it has to limit current to avoid over-heat, damage of electrode and acceleration of gas oxidation which are cause of performance degradation of laser system. In general, the inductor and the resistor are used to limit current. In addition, this type of transformer has high turn ratio to make high voltage. But we can get high voltage using transformer with low turn ratio which is driven by the self resonance. Also, advantage of the self resonance is to make simple circuit through the impedance of transformer in resonanct frequency which filters output voltage. I investigated and simplified the main theory for the good characteristics for Xe arc discharge flashlamp.
An experimental study on development of water mist fire-fighting systems for Ro-Ro spaces
Kwark, Ji-Hyun ; Kim, Young-Han ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 946~952
DOI : 10.5916/jkosme.2013.37.8.946
Large scale fire tests were conducted to develop water mist nozzles as a component of fixed water- based fire fighting systems for Ro-Ro spaces and special category spaces. Fire scenarios for this system consist of two cases which are for cargo fire in a simulated truck and for passenger vehicle fire, and each case has 3 different tests according to the position between fixed water mist nozzles and fire source. Every experiment proceeded for 30 minutes and acceptance criteria were based on gas temperature, fuel package's damage and ignition of targets. This study primarily dealt with the experimental results of cargo fire and focused on fire suppression capability in accordance with discharge pressure, flow rate and flow characteristics like swirl and penetration of the developed water mist nozzles. It appeared that low pressure water mist nozzles with about 40 L/min were able to control fire occurred in Ro-Ro spaces.
Hydrodynamic force calculation and motion analysis of OC3 Hywind floating offshore wind turbine platform
Kim, Min-Su ; Lee, Kang-Su ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 953~961
DOI : 10.5916/jkosme.2013.37.8.953
In this study, the analyzed turbine is a 5MW upwind-type wind turbine. This conceptual model was made to compare the results of the numerical analysis program in the IEA Annex23 Subtask2 OC3 project. The numerical analysis program used in this study is FAST developed by NREL and AQWA of ANSYS. Motion characteristics, such as RAO, average motion, significant motion and average amplitude of 1/10 highest motion were obtained through the numerical analysis. The results of the numerical analysis were compared with the results of other numerical analyses and the experimental results, and all the results agreed with one another. The results will help resolve the fundamental design trade-offs between basic floating system concepts.
A study on appropriate ship power system for pulse load combine with secondary battery
Oh, Jin-Seok ; Lee, Hun-Seok ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 962~968
DOI : 10.5916/jkosme.2013.37.8.962
Problem of greenhouse gases associated with global warming and the world rise in fuel oil prices due to the depletion of fossil fuel has attracted attention. For this reason, maritime transport business, has shown interest in green-ship technology to reduce the consumption of fuel and reduce greenhouse gas for environmental protection. Power system of the ship is one of the most important factors for safe operation. Therefore, at design of ship power system, most of existing vessel used comparative large capacity generator in order to respond peak load such as bow thruster, crane and etc. In the navigation of ship, marine generators most would be operated at low load operation. In the low load operation of the generation rate of 50% or less, the operation efficiency of the generator it deteriorated, to consume more fuel oil. It also, it means that adversely effect the life of the generator. In this paper, studied how to apply for a secondary battery in container ship that relatively frequent arrival and departure in port. As a result, in order to apply the secondary battery to increase the operating efficiency of the generator during the voyage, it was confirmed that it is possible to reduce fuel consumption.
A study on the improvement of ROK navy salvage and rescue activity using technical diving technique
Kim, Tae-Hyun ; Park, Jung-Sik ; Yu, Ho-Hwi ; Kang, Sin-Young ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 969~976
DOI : 10.5916/jkosme.2013.37.8.969
This study suggests the improvement of ROK Navy salvage and rescue diving system. ROK Navy system experiences characteristic restrictions for the environmental loading. These restrictions are known to deteriorate the efficiency of Navy salvage and rescue diving activity. In this study, the measurements were suggested to improve the efficiency. To achieve the goal, a comprehensive analysis is conducted using the published data including those of USN, NOAA and IANTD. Based on the analysis, suggestions were made. The technical diving techniques may be introduced to improve current ROK Navy diving system in limited areas. By adopting that technique, decompression procedures and underwater operation can be improved.
A feasibility study on the hybrid power generation system considering of electricity needs' fluctuation of coastal area's houses
Hwang, Kwang-Il ;
Journal of the Korean Society of Marine Engineering, volume 37, issue 8, 2013, Pages 977~983
DOI : 10.5916/jkosme.2013.37.8.977
Based on the consideration of the hourly patterns of the electricity power consumption, this study predicted the effectiveness of hybrid power generation system, which is composed with wind power generator and photovoltaic generator. And this case study is performed at Konrido, which is a affiliated island of Kyeongsangnam-do. As the results, it is obvious that it is not efficient to cover the whole electricity power consumption only with any single power generating system, because the hourly patterns of electricity power consumption, wind power generation and photovoltaic generation are quite different. And because the wind is being through almost 24 hours, it is also found out that wind power generating system with storage battery is the most efficient combination for this case study.