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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 30, Issue 8 - Nov 2006
Volume 30, Issue 7 - Nov 2006
Volume 30, Issue 6 - Sep 2006
Volume 30, Issue 5 - Jul 2006
Volume 30, Issue 4 - May 2006
Volume 30, Issue 3 - May 2006
Volume 30, Issue 2 - Mar 2006
Volume 30, Issue 1 - Jan 2006
Selecting the target year
Structural Analysis and Design of the Marine Leisure Boat
Ko, Jae-Yong ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 329~336
Problem and Status of Marine Leisure(Yacht) Industry in Korea
Park, Sung-Hyeon ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 337~343
Safety and Inspection of Water Leisure Apparatus
Jeong, Dool-Sung ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 344~350
Analysis of Macroscopic Spray Characteristics of Diesel Injectors with Three Different Needle Driving Type in Common Rail Direct Injection System
Lee, Jin-Wook ; Min, Kyoung-Doug ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 351~358
The capability of high pressure injection with small fuel quantify at all engine operating conditions is one of the main feature in common rail fuel injection system, which is used in small and light-duty Diesel engine. The key parameter for the better atomized fuel sprays and multiple injections of this common rail fuel injection control, that can be freely selected irrespective of the engine speed and load is the mechanism controlling the needle energizing and movement in high pressure Diesel injector. In the electro-hydraulic injector, the injection nozzle is being opened and closed by movement of the injector's needle which is balanced by pressure between the nozzle seat and the needle control chamber. This study describes the macroscopic spray structure characteristics of the common rail Diesel injectors with different electric driving method i.e. the solenoid-driven and piezo-driven type. The macroscopic spray characteristics such as spray tip speed. spray tip penetration and spray cone angle were investigated by the high speed spray, which is measured by the back diffusion light illumination method with optical system for the high speed temporal photography in a constant volume chamber pressurized by nitrogen gas. As the results, the prototype piezo-driven injector system was designed and fabricated for the first time in domestic case and the effect of injector's needle response driven by different drive type was compared between the solenoid and piezo-driven injector It was found therefore. that the piezo-driven injector showed faster needle response and had better needle control capability by altering the electric input value than the solenoid-driven injector.
A Study on the Strength Analysis of Crankshaft for 4 Stroke Marine Diesel Engine
Lee, D.C. ; Kang, D.S. ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 359~368
The trend on marine diesel engine productions and refinements has led to a higher mean effective pressure and thermal efficiency. These resulted in increased maximum combustion pressure within the cylinder and vibratory torque in crankshaft. In view of this. the crankshaft should be able to withstand the dynamic stresses caused by load variations. Different factors including size, material and stress concentration factors should also be considered to ensure the reliability of the shafting system. As such, crankshaft must be designed and compacted within its fatigue strength. In this paper, the strength analysis of crankshaft Is carried out by: simplified method recommended by IACS(International Association Classification Societies) M53 and a detailed method with the crankshaft assumed as a continuous beam and bearing supported in its flexibility. The results of these two methods are then compared.
Large eddy simulation of turbulent flow around a wall-mounted cubic obstacle in a channel using Lagrangian dynamic SGS model
Ko, Sang-Cheol ; Park, Nam-Seob ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 369~375
Large eddy simulation has been applied to simulate turbulent flow around a cubic obstacle mounted on a channel surface for a Reynolds number of 40000(based on the incoming bulk velocity and the obstacle height) using a Smagorinsky model and a Lagrangian dynamic model. In order to develop the LES to the practical engineering application, the effect of upwind scheme, turbulent sub-grid scale model were investigated. The computed velocities. turbulence quantifies, separation and reattachment length were evaluated by compared with the previous experimental results.
A study on formation of slurry ice by the reversing flow
Oh, C. ; Mun, S.B. ; Choi, Y.G. ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 376~381
This study is experimented to observe an influence of experimental conditions on production characteristics of slurry ice by putting ball into test section to disturb ice adhesion. And at this experiment it used ethylene glycol-water solution and the concentration is 20wt%. The experimental apparatus was constructed of ethylene glycol-water solution and slurry ice storage tank. brine tank, pumps for ethylene glycol-water solution and brine circulating, a mass flow-meter data logger for fluid temperature measuring and a vertical circular tube with two copper tubes as test section. The experiments were carried out under various conditions, with mean velocity of fluid at the entry ranging from 0.07 to 0.13m/s and ball diameter is 10mm, 15mm. Also ball filling rate is 33%, 50%.
An experimental study on ice slurry fluid and pressure drop characteristics in along a horizontal circular tube around the valve
Oh, C. ; Mun, S.B. ; Son, Y.G. ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 382~388
This study experimented to understand the effect of transporting ice slurry through in pipe with valve. And at this experiment it used ethylene glycol-water solution and a concentration is 30wt%. The experimental apparatus was constructed of ice slurry generation tank, turbo flow meter, manometers for differential pressure measuring, PIV system for flow pattern measuring. illumination and along a horizontal circular tube with valve as test section. The experiments were carried out under various conditions, with velocity of fluid at the entry ranging from 0.5 to 1.5 m/s and concentration of IPF is 30%. Also valve open rate is 50%, 75%, 100%.
Fluid Force Reduction Characteristics of a Square Prism Having Fences on the Corner
Ro, Ki-Deok ; Kim, Kwang-Seok ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 389~395
The fluid force reduction of a square prism having fences on the corner was studied by the measuring the drag and lift acting on the prism and by the visualization experiment of the flow around the prism. The height of the fence was 10% of the square width and the range of Reynolds number considered was from
. The drag of the prism was reduced about 6.8% and the amplitude of the lift was reduced by attaching two normal fences on the rear corners of the prism. In this case, the separated flow at the front corners was reattached on the upper and lower sides of the prism and the vortex streets at the wake region were appeared more slowly than that of the prototype prism.
Experimental Study on the Water Hammer Absorption Effects of Water Hammer Arrester in the Water Supply Piping System
Choi, Jung-Geun ; Lee, Suk-Jong ; Lee, Myoeng-Ho ; Sung, Jae-Yong ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 396~402
In this study, dynamic characteristics of water hammer pressure in water supply piping system with water hammer arrester has been investigated experimentally to characterize the transient pressure of water hammer in high rise building. Experiments were conducted to verify the absorption effects by water hammer arresters with 3 different gas volumes of water hammer pressure generated by sudden valve closure. As the results, it has been found that zoning and sizing of pipe diameter for suitable flow velocity and water hammer arresters with effective pressure absorption capacity have to be installed to protect water hammer problems in building water supply piping system.
Experimental and Computational Studies on Particle Behavior in High Temperature Gas with the Various Temperatures of a Solid Wall
Choi, Jae-Hyuk ; Lee, Ki-Young ; Yoon, Doo-Ho ; Yoon, Seok-Hun ; Choi, Hyun-Kue ; Choi, Soon-Ho ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 403~412
The effect of a wall temperature on the soot deposition process from a diffusion flame to a solid wall was investigated in a microgravity environment to attain in-situ observations of the process. The fuel for the flames was an ethylene (
). The surrounding oxygen concentration was 35% with surrounding air temperatures of
. In the study, three different wall temperatures.
=300, 600, 800K, were selected as major test conditions. Laser extinction was adopted to determine the soot volume fraction distribution between the flame and burner wall. The experimental results showed that the maximum soot volume fractions at
=300, 800 K were
, respectively. However, amount of soot deposition on wall surface was decreased because of lower temperature gradient near the wall with increasing wall temperature. A numerical simulation was also performed to understand the motion of soot particles in the flame and the characteristics of the soot deposition to the wall. The results from the numerical simulation successfully predicted the differences in the motion of soot particles by different wall temperature near the burner surface and are in good agreement with observed soot behavior that is, the 'soot line', in microgravity.
A Study about Choice of Industrial Mixer's Impeller Type for Concentration Measurement Method and PIV
Kim, Dong-Kyun ; Bae, Suk-Tae ; Kim, Jeong-Hwan ; Kim, Oh-Keun ; Lee, Young-Ho ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 413~419
The Industrial Mixers are used in various industrial fields where they are necessary to intimately mix two reactants in a short period of time. However, despite their widespread use, complex unsteady flow characteristics of industrial mixers are not systematically investigated. The present study aims for clarify unsteady flow characteristics induced by various impellers in a tank. Impellers are pitched blade turbine(PBT) types. Screw type and Rushton turbine type. In this study choice of the Industrial Mixer's Impeller type for distribution of concentration and PIV measurement method. The rotating speed of impellers are fixed by 100RPM.
Design and Characteristic Analysis of an 200[kW], 30000[rpm] Induction Motor for Gearless Turbo Machine
Jo, Won-Young ; Woo, Kyung-Il ; Cho, Yun-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 420~427
This paper describes design and characteristic analysis of the 200[kW], 3000[rpm] induction motor for gearless turbo machine. It was designed by the loading distribution method and the results of characteristics obtained by the equivalent circuit method are compared with the results of circle diagram. To verify the validation of design 2D finite element method is used and also 3D finite element method is used to calculate the current density curve of the rotor bars when they are broken.
A Study on Control of Stable Grasping Motion for Finger Robot
Choi, Jong-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 428~437
This paper attempts to derive and analyze the dynamic system of grasping a rigid object by means of two multi-degrees-of-freedom robot flngers with soft and deformable tips. It is shown firstly that a set of differential equation describing dynamics system of the manipulators and object together with geometric constraint of tight area-contacts is formulated by Lagrange's equation. It is shown secondly that the problems of controlling both the forces of pressing object and the rotation angle of the object under the geometric constraints are discussed. In this paper. the control method for dynamic stable grasping and enhancing dexterity in manipulating things is proposed. It is illustrated by computer simulation that the control system gives the performance improvement in the dynamic stable grasping of the dual fingers robot with soft tips.
A Study on the Seam Tracking Behavior for container box's welding
Ahn, Byong-Won ; Bae, Cherl-O ; Kim, Hyun-Soo ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 438~443
The probe type sensor using strain gauges was used to track a container box's seam in this paper. A strain gauge has a property which the specific resistance is changed by varying of the sectional area and length when tensile and compressive stresses are generated at the strain gauge. We designed the automatic seam tracking device by attaching the probe type strain gauge sensor, motor driving slide, encorder to check the moving distance and interface card connected MPU upside the speed controllable carriage. The folded work piece for a container box is made to examine whether the device can track the seam automatically or not. Seam tracking experiments were done by changing the carriage moving speed at 300. 400. 500. 600[mm/min] each as the voltage of side track was 2.5[V]. We compared and analyzed the sampling data which is obtained by output voltage of strain gauge sensor and rotary encorder pulse every 100 [m/s]. The welding experiments were performed by using
welding machine about the carriage moving speed that has good seam tracking condition in the seam tracking experiments above. And we compared the seam tracking status.
A Study on X-band Frequency Synthesizer for Radar Transceiver
Park, Dong-Kook ; Lee, Hyun-Soo ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 444~448
In this paper, a frequency synthesizer for X-band FMCW radars is proposed. Some X-band FMCW radars have been used as a level sensor for tanker ship and the resolution of the level sensor may be mainly depend on linearity of frequency sweep. For a linear frequency sweep. the proposed synthesizer employs a phase-locked loop using prescalars and a high speed digital PLL chip. The measured results show that the linear frequency sweep range is from 10 GHz to 11 GHz and the output power of the synthesizer is minium 7 dBm. and the phase noise is about -80 dBc/Hz at 100 KHz offset from 11 GHz.
Multipoint Pressure-detection Sensors using Microbanding-induced Long-period Fiber Gratings
Sohn, Kyung-Rak ; Choi, Young-Gill ; Jang, Se-In ; Choi, Jae-Yun ; Shim, Joon-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 3, 2006, Pages 449~454
We present a pressure sensor based on the mechanically induced long-period fiber gratings (LPFG) for detecting the multi-location strain variation. The theoretical analysis is performed using a graphic method for a weakly guiding step-index fiber. The calculated results are in good agreement with the experimental results. In this study, from the fact that the optical parameters of a single-mode fiber slightly differ from manufacturing company to manufacturing company, the multipoint pressure-detection sensor systems composed two identical LPFGs are realized. When the pressure is applied two LPFG sensors at once, the resonance peaks are separated as much as about 40 nm. These types of sensor systems are well suited as a multipoint monitoring of strain or temperature in the ship or the smart structure.