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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 27, Issue 7 - Nov 2003
Volume 27, Issue 6 - Sep 2003
Volume 27, Issue 5 - Jul 2003
Volume 27, Issue 4 - Jul 2003
Volume 27, Issue 3 - May 2003
Volume 27, Issue 2 - Mar 2003
Volume 27, Issue 1 - Jan 2003
Selecting the target year
Recent Tendency of Vibration Calculation of Propulsion Shafting
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 171~173
Vibration Characteristics and Countermeasures on the Two Stroke Low Speed Diesel Engines
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 174~180
Vibration Control of Medium and High Speed 4-Stroke Diesel Engine System
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 181~189
Vibration Analysis of Turbocharger Shaft System
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 190~197
Lateral Vibration and Shaft Alignment on the Propulsion Shafting System
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 198~208
Evaluation Criteria and Measurement Methods Revised of Vibration on the Diesel Engines and Propulsion Shafting
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 209~217
Control of the Hydraulic System Using the Global Sliding Mode Control
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 218~228
A hydraulic system is modeled as the second order differential equation with uncertain system parameters and disturbance composed of modeling errors. To Position the load of the hydraulic system to a desired point. the servo valve of the hydraulic system is controlled. As a control scheme. a global sliding mode control(GSMC) is Proposed Since the servo valve has a torque limit. the GSMC is designed to coordinate the position of the load along the minimum time trajectory within the torque limit. The Proposed control scheme can be designed with ranges of parametric uncertainties and specified torque limits. By the proposed control scheme, the closed form solution of the arriving time at the desired position can be estimated.
Numerical Analysis on the Heat Transfer Characteristics of Multiple Slot Jets at the Surface of Protruding Heated Blocks
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 229~237
The flow and heat transfer characteristics at the surface of two-dimensional protruding heated blocks using confined impingement multiple slot jets were computationally investigated Numerical predictions were made for round-edged nozzles at several nozzle-to-target plate spacings and jet-to-jet distances, with turbulent jet Reynolds numbers ranging from 2000 to 7800. The commercial finite-volume code FLUENT was used to solve the heat transfer characteristics and flow fields using a RNG
model. The computed heat transfer characteristics at the surface of heated blocks were in good qualitative agreement with previous experimental data The results of heat transfer characteristics on the surface of protruding heated blocks are important considerations in electronics Packaging design.
Development of a New Robot Manipulator Driven by the Closed-chain Actuator
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 238~245
To overcome the weakness in the load capacity of conventional robot manipulators actuated by motors with the speed reducer such as the harmonic driver, we proposed a new closed-chain type of the robot actuator which is composed of the four-bar-link mechanism driven by the ball screw. The robot manipulator is revolute-jointed and composed of four axes. The base axis is actuated by the lineal actuator such as the ball screw, and the others are actuated by the proposed actuator. We analyzed the mechanism of the actuators of the robot joints, and developed the dynamics model. The dynamics are expressed in the joint coordinates and then they are mapped into the sliding coordinates of the ball screw. We performed fundamental tests on the structure of the robot.
Study on the Simulation of the 4-Stroke Cycle Spark Ignition Engines(Second Paper)
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 246~259
For predicting the performances of the four stroke cycle spark ignition engines. the gas behavior in the engine system has been analyzed. The calculations consist of two parts. the calculation of the gas behavior in the intake and exhaust systems which was described in the first paper, and the calculation of the variations of gas properties inside the engine cylinders. In this Paper the simulations for the in-cylinder processes were described for the MPI engine, naturally aspirated and turbocharged engines with a carburettor. With the combination of the calculations of the intake and exhaust systems and the calculation of the in-cylinder processes. the predictions of the engine Performances and the exhaust emission characteristics were carried out. And the result showed good agrements with the experimental results under wide range of operating conditions.
Aspects of Mixture Formation in a Swirl Type GDI Engine
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 260~271
For the Purpose of understanding the mixing phenomena of a GDI(Gasoline Direct Injection) engine, the spray behaviors and fuel distributions were investigated in a single cylinder transparent GDI engine. The experimental engine is a swirl type GDI engine with a SCV(Swirl Control Valve). PLIF(Planar Laser Induced Fluorescence) system with KrF Excimer laser was used for the measurement of the fuel distributions. The effects of SCV opening angles and the injector specifications on the fuel distribution characteristics were investigated. As a result, it was found that the SCV opening angle had a great effect on the fuel distributions in the late stage of compression process by changing the flow fields in the combustion chamber.
Experimental Study on Transformation of IPF and Pressure Drop in Branches with Ice Slurry
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 272~279
This study aimed to understand the effects of transporting ice slurry Particles through Pipes with branches. The experimental apparatus was constructed as ice slurry mixing tank. vortex pump, manometers for differential pressure measuring. IPF(ice packing factor) measuring instruments and branches as test sections. The experiments were carried out under various conditions. with concentration of water solution ranging between 0∼20wt% and velocity of water solution at the entry ranging between 1.5∼2.5m/s. The differential Pressure and IPF between the pipe entry and exit were measured. and flowing form was checked throughout the experiment. The pressure loss in 3d branches appeared compared with 6d branches so that it was very high. In the pressure loss of the inside and outside of branches. 6d branches was showed the difference. but was agreed in 3d branches The pressure loss according to concentration of water solution, low value appeared at 10wt% in 6d branches, at 20wt% in 3d branches. The pressure loss according to velocity, did not show large difference. The change of IPF at outlet, appeared +15∼-25% in 6d branches and 0∼-20% in 3d branches. The difference of IPF at the inside and outside of branches. appeared 10∼15% in 6d branches and maximum 5% in 3d branches.
A Study on the Combined Equipment for the Pre-cooling and the Thawing using the Low Temperature Vacuum System
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 280~288
We need refrigeration system which can maintain the freshness of agricultural products, because of being distance from a tiller to a consumer. Vacuum Pre-cooling system has an advantage in quality maintenance through vapid cooling down by using latent heat of evaporation of stored products. A number or thawing methods in current use have also several disadvantages in thawing time. discoloration mass loss caused by drying, capital costs and running cost. These damages are, it is claimed, either eliminated or improved by the vacuum thawing system. An experimental study on the pre-cooling for the bean sprouts and cabbage, and thawing for hairtail and croaker by the low temperature vacuum system were carried out. The cabbage cooling time with this Pre-cooling vacuum system took about 60 minutes to reach from
at 5 mmHg abs. (
MPa). The croaker thawing time with this low temperature vacuum thawing system took about 170 minutes to reach from
at 20 mmHg abs (
MPa). The vacuum Pre-cooling and thawing system have merits compared with present systems in their short intervals to cool down and to thaw without any quality losses.
A Study on the Deformation Analysis of Largely Deformed Elasto-Plastic Material Using a Meshfree Method
Kyu-Taek Han ;
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 289~298
Meshfree approximations exhibit significant Potential to solve partial differential equations. Meshfree methods have been successfully applied to various problems which the traditional finite element methods have difficulties to handle including the quasi-static and dynamic fracture, large deformation problems, contact problems, and strain localization problems. Reproducing Kernel Particle Method (RKPM) is used in this research fur to its built-in feature of multi-resolution. the sound mathematical foundation and good numerical performance. A formulation of RKPM is reviewed and numerical examples are given to verify the accuracy of the proposed meshfree method for largely deformed elasto-plastic material.
A Study for the Pressure Drop of Static Mixers
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 299~304
Static mixer consists of a straight pipe of circular cross section into which individual elements are inserted to cut, fold, twist and re-combine the mixing fluid. The number of elements and their shape required in any application depend on the complexity of the mixing process. The objectives of this study are to develop a new static mixer and to perform the experimental investigation of pressure drop in order to evaluate the performance of the new one. The mixing fluid used is Glycerin. The pressure drop is measured using a hydraulic manometer and the correlation of Z-factor is suggested as a function of Re. The Z-factors of SSC and YNU mixer are about 40% lower than and 4% higher than that of the Sulzer one.
The Study of Using Separate Heatpipes for Thermal Control in Electronic Equipments
Journal of the Korean Society of Marine Engineering, volume 27, issue 2, 2003, Pages 305~311
This Paper Presents an information about the heat transfer characteristics of a separate type thermosyphon in electronic equipments. The heat removal problem of electronic equipments is regarded as an important factor and a separate type heatpipes can be utilized as a cooling device of electronic equipments (such as CPU of a Personal computer or notebook). In this study. heat source (
aluminum Pseudo CPU) was used for the experiment. The device can transfer heat from the evaporator to the condenser through natural circulation (without any external driving forces) and the results indicate that the device is capable of dissipating over 60W of thermal energy and keeping the heating plate surface temperature under