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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society of Marine Engineering
Journal Basic Information
Journal DOI :
Korean Society of Marine Engineers
Editor in Chief :
Volume & Issues
Volume 38, Issue 10 - Dec 2014
Volume 38, Issue 9 - Nov 2014
Volume 38, Issue 8 - Oct 2014
Volume 38, Issue 7 - Sep 2014
Volume 38, Issue 6 - Jul 2014
Volume 38, Issue 5 - Jun 2014
Volume 38, Issue 4 - May 2014
Volume 38, Issue 3 - Mar 2014
Volume 38, Issue 2 - Feb 2014
Volume 38, Issue 1 - Jan 2014
Selecting the target year
Improvement of combustion efficiency for marine auxiliary diesel engine
Jung, Kyun-Sik ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 233~239
DOI : 10.5916/jkosme.2014.38.3.233
The accurate engine output is basically one of important factors for the analysis of engine performance. Nowadays in-cylinder pressure analyzer in internal combustion engine is also an indispensable tool for engine research and development, environment regulation and maintenance of engine. The combustion analysis is desperately needed in order to induce a correct judgment on the condition of the engine and suggest the specific ways to improvement as well as the correct engine output. And these tool is advantageous to reduce fuel consumption and maintenance of the engine. In this study, using the developed measuring kit, combustion analysis of marine generator engine which was adapted as test engine was carried out. It was verified that the good operation condition of the engine as well as contributing to fuel savings by checking and readjusting accurately the irregular combustion of the test engine were accomplished. From the results all above, it was recognized that the measuring kit by new method for engine output was developed and verified for its utilities.
A study on the greenhouse gas emission from ships with training ship HANBADA
Lee, Sang Deuk ; Koh, Dae Kwon ; Jung, Suk Ho ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 240~245
DOI : 10.5916/jkosme.2014.38.3.240
As the seriousness of the global environment pollution is gaining our attention recently, researches on application of greenhouse gas emission of ship are being carried globally. However domestic study on greenhouse gas emission from ship was not carried out in various fields. In this study, quantitative data which was presented by greenhouse gas emission of training ship HANBADA and greenhouse gas emission was calculated by Tier 1 method based on total fuel consumption and amount of shore power. Actual voyage data for 1year in 2012 was used to analysis the greenhouse gas emission. This study showed how many weight of gases were exhausted per 1 gross tonnage and per 1trainee in the training ship. There is a need of further research to reduce pollutant and to respond to international environment regulation consistently.
The development of small water-jet propulsion for 150HP grade inboard type
Lee, Joong-Seop ; Lee, Chi-Woo ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 246~252
DOI : 10.5916/jkosme.2014.38.3.246
This study is on the development of 150PS inboard type of compact water jet propulsion system. The water jet is composed of intake, impeller, diffuser, reverse bucket and main shaft. Components of water jet have been manufactured through precision processing after sand casting. Development of water jet propelled engine has been finally completed by processes which are design, production and inspection on each component. The water jet performance characteristics show that 0.29 m3/s of maximum flow rate and 37 m/s of flow velocity have been secured in the ground test pool. Field test was performed by 21ft test ship that water jet propulsion equipment developed in this study was installed. As a result, the weight of hull, engine and other parts of the ship has been almost 1.2 ton and 45 km/h of maximum sailing speed has been recorded with 3700 rpm of engine in the domestic coast test.
Vibration characteristics of power differential gear train for 2.5MW wind turbine
Kim, Jung Su ; Park, No Gill ; Lee, Hyoung Woo ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 253~261
DOI : 10.5916/jkosme.2014.38.3.253
In this paper, vibration analysis of power differential gear train for 2.5MW wind turbine system is analyzed. which system is composed of two planetary gear set, one helical gear set and main shaft that connected by flange. Planetary gear set, helical gear set, main shaft are modeled in MASTA program and housing, torque arm, carrier, flange components are modeling by finite element method. Each models are combined by component mode superposition. To analysis of natural vibration characteristic about 2.5MW wind turbine gear train was performed and check about critical speed with wind load, mass unbalance, angle misalignment excitation frequency.
Development of high speed coupling for 2MW class wind turbine
Son, Seung Deok ; Lee, Hyoung Woo ; Han, Jeong Young ; Kim, Yong Won ; Kang, Jong Hun ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 262~268
DOI : 10.5916/jkosme.2014.38.3.262
This research introduces the structural design and the validation results of the flexible high speed coupling for 2MW class wind turbine which transmit and cut off torque between gear box and generator. The high speed coupling requires electrical insulation to prevent electrical surface damages on gear box. Therefore glass fiber reinforced plastics is applied to absorb the vibration and deformation of power train and to transmit required torque. Finite element analysis was performed to optimize the thickness and accumulation number of glass fiber reinforced plastics. Torque limiter which cut off the abnormal torque is designed in frictional disc type. The design of the coupling was validated with the performance test of prototype.
Performance characteristics of inline mixing and coagulation system
Kim, Dong-Jun ; Park, Sang-Kyoo ; Yang, Hei-Cheon ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 269~275
DOI : 10.5916/jkosme.2014.38.3.269
The objective of this study was to investigate the performance characteristics of an inline mixing and coagulation system for water treatment based on the process intensification concept. Three-stage inline mixing and coagulation system was composed of the reservoirs of source wastewater, the fixed quantity injection pumps of coagulants, the mixing and coagulation tubes, a sedimentation tank and a control panel. In the equal dosage of coagulant and coagulant aids, the turbidity removal with increasing the dosage of coagulant aids was about 3 times higher than that with increasing the dosage of coagulant. In the condition of the equal mixing and coagulation time, the turbidity removal of inline mixing and coagulation system was about 4.6 times higher than that of mechanical type.
The development of a preliminary designing program for ORC radial inflow turbines and the design of the radial inflow turbine for the OTEC
Kim, Do-Yeop ; Kang, Ho-Keun ; Kim, You-Taek ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 276~284
DOI : 10.5916/jkosme.2014.38.3.276
The purpose of this study is to establish the designing method of ORC(Organic Rankine Cycle) radial inflow turbines. RTDM(Radial Turbine Design Modeler) Ver.2.1 which is a preliminary design program of radial inflow turbines was developed to achieve this purpose. The 200kW-class radial inflow turbine for OTEC(Ocean Thermal Energy Conversion) was designed by using the RTDM Ver.2.1 and CFD(Computational Fluid Dynamics) simulation was performed to verify the accuracy of RTDM Ver.2.1. With the result of simulation, the accuracy of RTDM Ver.2.1 was almost 94.6% based on the designed total enthalpy drop of the radial inflow turbine. Strategy of adjusting the mass flow rate was adopted on this study to satisfy the requirements of its power and rotor outlet's conditions for the designed radial inflow turbine. The mass flow rate was consequently increased to 21.2 kg/s for the designed 200kW-class radial inflow turbine for OTEC, and then Total to total and Total to static efficiency are 89.8% and 85.36% respectively.
An experimental study on influence of wearing seal groove shape to performance of the pump
Kim, Jun-Ho ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 285~291
DOI : 10.5916/jkosme.2014.38.3.285
This paper is related to the improvement of efficiency for high performance centrifugal pumps by reducing leakage loss, which is achieved by applying the grooved seal as a non-contact seal to the pumps. Various combinations of grooved seal types, including the spiral and the parallel groove in the rotor and/or in the stator, were tested by the experiment. And the corresponding hydraulic performance and the magnitude of axial thrust were measured and calculated for ten cases. From the results, the type with the spiral groove(spiral angle :
) in both the rotor and the stator was found to be most effective. In this case, the head and the efficiency were improved from the original design by 2.1% and 2.3% respectively at design capacity(
), and the axial thrust was decreased by 10%.
Development of electro hydraulic ballast remote valve control system with diagnostic function using redundant modbus communication
Kim, Jong Hyun ; Yu, Yung Ho ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 292~301
DOI : 10.5916/jkosme.2014.38.3.292
This paper describes development of distributed type independent electro-hydraulic ballast valve remote control system with diagnostic function based on fuzzy inference using redundant Modbus communication and ethernet Modbus TCP/IP. Diagnostic function estimate degradation of system components and diagnose system faults, which results in shortage of fault maintenance time and improvement of system safety. Slave devices which control each valve and master device which command, monitor and diagnose slave system are developed. Slave devices are connected to master device with redundant Modbus networks and master device is connected to ship's integrated control system with Modbus TCP/IP. Also this paper describes development of simulator to test and confirm whether developed system can be integrated with ship's integrated control and monitoring system.
A study on RF characteristics of fishbone-type transmission line on PES substrate for application to flexible wireless communication device
Yun, Young ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 302~311
DOI : 10.5916/jkosme.2014.38.3.302
In this work, a FTTL (fishbone-type transmission line) structure was fabricated on PES (polyether sulfone) for a realization of transparent flexible wireless communication device, and its RF characteristics were investigated. According to the results, the FTTL on PES showed a short wavelength characteristic compared with conventional coplanar waveguide. Concretely, the wavelength of the FTTL was 2.23 mm at 50 GHz, which was 56.6 % of the conventional coplanar waveguide. According to the bandwidth extraction result, the passband of the FTTL on PES was 608 GHz. Unlike conventional periodic structures, the characteristic impedance of the FTTL on PES showed a very low frequency dependency, which means that the FTTL on PES can be used for application to transmission line and distributed passive components with a broadband operation frequency.
Power supply design and discharge characteristics analysis of xenon flashlamp by using LLC resonance rhenomena
Lee, Hee-Chang ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 312~317
DOI : 10.5916/jkosme.2014.38.3.312
In this paper, I propose the design technology of LLC resonant converter for the xenon flashlamp that is used to the solid state laser. Through the fabrication of 1.5kW large scale LLC resonant converter, the discharge characteristics are carried out, and introduce the new control method for limiting inrush current by the abrupt load current changes. The mathematical modeling for the lamp discharge includes the internal loss and lamp parameters. I propose the optimal method for the driving conditions of xenon flashlamp from the simulation results comparing the real measurements.
A study on the construction of aafer citadel
Ha, Weon-Jae ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 318~324
DOI : 10.5916/jkosme.2014.38.3.318
A Citadel is a designated pre-constructed space in the ship for the crew protection, in the event of imminent boarding by pirates. A Citadel is to be designed and constructed to resist for a certain period against pirate attack. A Citadel constructed in secret place of the ship based on the provisions of international and national requirements, is the last refuge from the pirates attack. This study try to identity identify the limitation and weakness of the current Citadel and suggest to applicable improvement on the Rules for Ship's Facilities for safer and more secure Citadel.
A study on the strategy of concerned parties with regard to the performance standards and implementation schedule of ballast water treatment systems
Kim, Kyong-Min ; Kim, Hoi-Jun ; Ha, Weon-Jae ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 325~332
DOI : 10.5916/jkosme.2014.38.3.325
In installing ballast water treatment system, the cost of the system is high and many technical aspects are to be considered and also it takes significant time to retro-fitting on the existing ships. In addition, in the current circumstance which the Ballast Water Management Convention has not been entered into force, the 28th IMO Assembly adopted a resolution to mediate the implementation schedule of the treatment systems. In the mean time, California State and New York State have declared more stringent discharge requirements of ballast water and are planning to implement them earlier than the schedule of the Convention. In these circumstances, the implication in the difference between ballast water treatment system manufacturers and ship owners need to be considered. In this study, through the review on the considerations when installing the system onboard, stringent requirements of United States of America, and determent or mediated implementation schedules of Convention and California and New York States, the author would like to suggest the strategy of concerned parties for anticipated entrry into force of the Convention and implementation of the stringent requirements of United States of America.
Physical property analysis of sediments for development of maritime archaeological survey techniques
Kim, Sung-Bo ; Ko, Eun-Ji ; Jung, Yong-Hwa ; Lee, Young-Hyun ; Kim, Jin-Hoo ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 333~341
DOI : 10.5916/jkosme.2014.38.3.333
Since distribution and preservation of cultural artifacts in the submarine sediments are directly affected by not only ocean currents and tides, but also their composition, it is very important to investigate geological characteristics of sediments and ocean-sediment interactions for maritime archaeological survey. Physical properties of submarine sediments, which are collected by grab sampler and vibro-corer, are analyzed in order to investigate effects of submarine environment on development of maritime archaeological survey techniques. Result of physical property analysis showed that bulk density, shear strength, and magnetic susceptibility increase with depth, while water contents and porosity decrease with depth. Since the magnetic susceptibility of bedrock is about 40 times that of submarine sediments, it might impact greatly on the response of magnetic survey. Physical properties of sediments with depth and sediment classification by Folk's ternary diagram indicate that submarine sediment mainly consists of silt, and cultural artifacts can not penetrate no deeper than 1.5 m in sediments.
A study on the efficiency advancement for evacuation of the crews by ship structural improvement
Kim, Wonouk ; Lee, Myoungho ; Kim, Jongsu ;
Journal of the Korean Society of Marine Engineering, volume 38, issue 3, 2014, Pages 342~348
DOI : 10.5916/jkosme.2014.38.3.342
Onshore great fires can normally be extinguished by firefighters using special firefighting equipment and its suitable method. However, offshore fires on the ships are to be extinguished by the crew without any supports from the onshore. Also, crews working on board are exposed to high risk of emergency evacuation due to the complicated structure arrangement of the ships and different accident types such as fire and ship collisions. As most of damage and loss of life in fire are associated with suffocation, shortening of evacuation time is an important factor to improve a survival rate. In this study, visibility in the accommodation area is analyzed by using the temperature and smoke flow which are obtained by the Fire Dynamic Simulator(FDS) as a Three-Dimensional Fire Analysis program to understand the survival rate of the crew upon the fire. The fire doors for most of ships are designed to close automatically when the fire alarm is activated. These automatic closing of the fire doors is a very effective system to delay the spread of flame and smoke flow for the unmanned spaces of the fire protected area. However, if the crew cannot escape within the estimated time, the crew inside the fire protected area will be damaged a lot. In this paper, the comparative analysis between the evacuations by using the fire door from the fire protected area and the suggested fire shielding structure in this study is carried out by the smoke flow rate and the temperature rise rate.