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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 29, Issue 8 - Nov 2005
Volume 29, Issue 7 - Nov 2005
Volume 29, Issue 6 - Sep 2005
Volume 29, Issue 5 - Jul 2005
Volume 29, Issue 4 - May 2005
Volume 29, Issue 3 - May 2005
Volume 29, Issue 2 - Mar 2005
Volume 29, Issue 1 - Jan 2005
Selecting the target year
Design Basis of Marine Refrigeration system
Park Ki-Won ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 822~827
Trend of Refrigeration Plant and Cold Storage Facility in Korea
Oh Jong-Tack ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 828~833
Equipment Basis of Marine Refrigeration system
Jung Jae-Cheon ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 834~841
Trajectory control of a manipulator by the decoupling sliding mode method
Nam Taek-Kun ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 842~848
The decoupling control using state feedback was once intensively studied during 1960's by many researchers. However, this control scheme was sensitive to the disturbance and Parameter variations. SMC(sliding mode control) is known as a robust control methodology to overcome such a disturbance. In this paper. the decoupling control by means of SM(sliding mode) for a trajectory control of a two-degrees-of- freedom manipulator was discussed. The position and velocity of manipulator tip were adopted to compose a nonlinear error functions. The reference inputs of the controller can be decided by switching function combined with the desired position and velocity. Simulation result is provided to verify the effectiveness of the proposed control scheme.
Large eddy simulation of turbulent premixed flame with dynamic sub-grid scale G-equation model in turbulent channel flow
Ko Sang-Cheol ; Park Nam-Seob ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 849~854
The laminar flame concept in turbulent reacting flow is considered applicable to many practical combustion systems For turbulent premixed combustion under widely used flamelet concept, the flame surface is described as an infinitely thin propagating surface that such a Propagating front can be represented as a level contour of a continuous function G. In this study, for the Purpose of validating the LES of G-equation combustion model. LES of turbulent Premixed combustion with dynamic SGS model of G-equation in turbulent channel flow are carried out A constant density assumption is used. The Predicted flame propagating speed is goof agreement with the DNS result of G. Bruneaux et al.
An Evaluation of Fracture Toughness for SS400 Steel by R-curve and DCPD
Jang Seok-Ki ; Han Min-Su ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 855~861
Fracture toughness defined near the initiation of stable crack growth is investigated by R-curve and Direct Current electric Potential Determination(DCPD) under mode I plane strain conditions for CT specimen with 25.4mm thickness of SS400 steel. Fracture toughness.
lit near crack tip of CT specimen by R-curve is 17.14
and however. its value by DCPD is 22.82
The value of fracture toughness by DCPD is larger than that by R-curve. Therefore, it is suggested that the evaluation of fracture toughness by R-curve is optimum than by DCPD, when considering amount of crack growth about each of fracture toughness.
A Numerical Analysis of Convective Heat Transfer in Air Flow Channels of a Plate Fin-tube Matrix for Heat Pipe Heat Sinks
Kim Sung-Hoon ; Shin Hyun-Myung ; Kim Chul-Ju ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 862~869
A study on convective cooling characteristics has been done in the channels with heat pipes and associated Plane fins Analysis with FLUENT V5.0 lies its Purpose on the possible enhancement of heat transfer capability between an existing three in-line arrayed heatpipes and an extending four in-line arrayed heatpipes with increasing channel width. Numerical analysis is limited to the laminar flow in an isolated flow channel by employing cyclic boundary conditions for calculation purposes. Friction factors for three and four in-line arrayed heatpipes are compared with experimental results. In addition, temperature behavior at the plate fin for the three in-line arrayed heatpipes is compared with experiment. Friction factors and overall channel heat transfer coefficients (and/or Nusselt numbers) are presented as a function of Reynolds number. An increase of number of heatpipes and channel width reults in a decrease of the friction factor and doesn't not result in an increase of heat transfer performance. However. considering the 25
increase of heat load accompanies with maximum 8
rise of average temperature of heat pipes, the four in-line array with the increase of channel width of heat pipe heat sink can be considered appropriate.
Study on Performance Characteristic of Water-Cooled Type Beat Pump Using Hydrocarbon Refrigerants
Jun Chul-Ho ; Lee Ho-Saeng ; Kim Jae-Dol ; Yoon Jung-ln ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 870~876
This study of the performance characteristics of natural refrigerants such as R-290 (propane), R-6OOa (iso-butane) and R-1270 (propylene) has investigated to compare with conventional HCFC's refrigerant R-22 for water-cooled heat pump system. The experimental apparatus has basic parts of cycle that uses the water as a heat source. The Performance of the water-cooled system using hydrocarbon refrigerants had been getting better than R-22 from start-up to the similar evaporating temperature after stabilizing system. Through the above it is possible that hydrocarbon refrigerants could be drop-in alternatives for R-22.
Vibration Analysis of Wedge Type Bar by Ritz Method
Park Sok-Chu ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 877~882
This paper discusses the lateral vibration of a bar which has its tip free. The uniform bar has a solution by summation of some simple exponential functions But if its shape is not uniform, its solution could be by Bessel's function, or mathematical solution could not be existed. Enen if the solution of Bessel's function exists. as Bessel function is a series function. we must got the solution by numerical method Hereby the author Proposes the ununiform beam solution of the matrix method by Ritz's method. and Proposes a new deflection shape function.
A new method to convert into seawater heat for the indoor air-conditioning resource
Kim Ki-Cheol ; Lee Seong ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 883~890
The industrial growth and the raised living quality have led to the massive energy consumption. As a result. the polluted environment and the limited amount of energy resources emerged as serious problems to be resolved in 21st century. Especially, in the case of Korea whose imported energy dependency rate is 98.2
in 2003 and constantly increasing every rear. more than 24
of overall energy consumption is for housing and commercial use. In order to cope with the shortage of natural energy resources, it is inevitable to develop alternative sustainable energy resources including seawater heat. so that they can replace existing resources. The heat transfer air velocity 3.5 m/s is proper to consideration with the body the pipe size 200A is more suitable than look due to the air velocity quantify and the ratio of pipe surface area. And the error between experimental data with simulation is below 5.34
so the suggested equation for calculating heat transfer capacity can be used. Therefore out of many methods utilizing seawater heat. this work Presents the efficiency of using sea water heat as a resource for air-conditioners which can be converted from the outside air through the air-to-heat conversion tube . Consequently. this method provides pretty reasonable energy efficiency.
Development of Large Superalloy Exhaust Valve Spindle by Dissimilar Inertia Welding Process
Park Hee-Cheon ; Jeong Ho-Seung ; Cho Jong-Rac ; Lee Nak-Kyu ; Oh Jung-Seok ; Han Mvoung-Seoup ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 891~898
Inertia welding is a solid-state welding process in which butt welds in materials are made in bar and in ring form at the joint race, and energy required lot welding is obtained from a rotating flywheel. The stored energy is converted to frictional heat at the interface under axial load. The quality of the welded joint depends on many parameters, including axial force, initial revolution speed and energy amount of upset. working time, and residual stresses in the joint. Inertia welding was conducted to make the large exhaust valve spindle for low speed marine diesel engine. superalloy Nimonic 80A for valve head of 540mm and high alloy SNCrW for valve stem of 115mm. Due to different material characteristics such as, thermal conductivity and flow stress. on the two sides of the weld interface, modeling is crucial in determining the optimal weld geometry and Parameters. FE simulation was performed by the commercial code DEFORM-2D. A good agreement between the Predicted and actual welded shape is observed. It is expected that modeling will significantly reduce the number of experimental trials needed to determine the weld parameters. especially for welds for which are very expensive materials or large shaft. Many kinds of tests, including macro and microstructure observation, chemical composition tensile , hardness and fatigue test , are conducted to evaluate the qualify of welded joints. Based on the results of the tests it can be concluded that the inertia welding joints of the superalloy exhaust valve spindle are better properties than the material specification of SNCrW.
A Study on the Vortical patterns of a Heaving Foil
Yang Chang-Jo ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 899~906
It is known that an oscillating airfoil can Produce a driving force through the generation of a reversed
vortex street, and this can be expected to be a new highly effective propulsion system. The wake formation behind the heaving airfoil was visualized and was measured using PIV systems We have been examined various conditions such as frequency number, amplitude in NACA 0010. As Strouhal number is greater than 0.08. wake profile with velocity deficit can be transformed into the wake with velocity excess After evaluating vortex center flow patterns in the wake investigated using tracking trajectories in temporal evaluation of the shedding vortices. We also Presented the experimental results on the unsteady vortices structure of the heaving airfoil at various parameters.
In-situ Observation of Soot Deposition Behavior in a Diffusion Flame along Solid Wall by using Microgravity Environment
Choi Jac-Hyuk ; Fujita Osamu ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 907~914
Experiments at the Japan Microgravity Center (JAMIC) have investigated the interaction between diffusion flames and solid surfaces Placed neat flames The fuel for the flames was
The surrounding oxygen concentration was 35
with surrounding air temperatures of
: 300K. Especially, the effect of wall temperature on soot deposition from a diffusion flame Placed near the wall has been studied by utilizing microgravity environment, which can attain very stable flame along the wall. Cylindrical burner with fuel injection was adopted to obtain two dimensional soot distributions by laser extinction method. In the experiment two different wall temperatures.
=300, 800 K, were selected as test conditions The results showed that the soot distribution between flame and burner wall was strong1y affected by the wall temperature and soot deposition increases with decrease in wall temperature. The comparison among the values lot two different wall temperatures suggests that the change in thermophoretic effect is the most dominant factor to give the change in soot deposition characteristics.
Experimental Study on the Flow around a Square Prism with a Splitter Plate
Park Jong-Kyu ; Seo Seong-Ho ; Boo Jung Sook ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 915~922
This experimental study is conducted to investigate effects of a splitter plate, which is set on the back side of a square prism in the uniform flow. The Reynolds number is 1.44
based on the width of the square prism. The measurement of velocity vector and pressure distribution are carried out 4 cases of length in the range of 0.5L to 2.0L with 0.5L interval and 3 cases of Position at 0L, 0.25L, 0.5L, Flow visualization is also executed by smoke-wire method to understand the mechanism of vortex formation The results show the strong vortex shedding patterns and drags are decreased effectively, when the position of splitter plate is 0L. And the drag reduction rate is in inverse proportion to the splitter plate length
A Study on the Fatigue Strength of Compressed Air Tank for Ships(I)
Kim Jon-Ho ; An Jae-Hyeong ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 923~928
The estimation of fatigue life at the design stage of the compressed air tank on board is very important in order to arrive at feasible and reliable solutions considering the total lifetime of the tank. In this paper the compressed air tank on board was selected as a model and the change of inside pressure of the tank during normal navigation period was measured and the cycle of fluctuation stress was presumed statistically based on this. Also the effect of stress concentration with the FEM analysis on the longitudinal weld and the mean stress effect on the fatigue strength of compressed air tank were discussed.
Numerical Simulation of Edge Tone by Finite Difference Lattice Boltzmann Model with Internal Degree of Freedom
Kang Ho-Keun ; Kim Eun-Ra ; Oh Se-Kyung ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 929~937
A lattice BGK model based on a finite difference scheme with an internal degree of freedom is employed and it is shown that a diatomic 9as such as air is successfully simulated In a weak compressive wane problem and Coutte flow, the validity and characteristics of the applied model are examined. With the model. furthermore. we present a 2-dimensional edge tones to predict the frequency characteristics of discrete oscillations of a jet-edge feedback cycle by the FDLB model (I.D.F FDLBM) in which any specific heat ratio
can be chosen freely. The jet is chosen long enough in order to guaranteed the Parabolic velocity profile of a jet at the outlet. and the edges have of an angle of
. A sinuous instability wane with real frequency resulting from Periodic oscillation of the jet around the edge is propagated on the upper and lower of wedge.
A Manufacturing Process analysis of Large Exhaust Valve Spindle considering Microstructure Evolution
Jeong Ho-Seung ; Cho Jong-Rae ; Park Hee-Cheon ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 938~945
The microstructure evolution in hot forging process is composed of dynamic recrystallization during deformation as well as grain growth during dwell time. Therefore, the control of forging parameters such as strain, strain rate. temperature and holding time is important because the microstructure change in hot working affects the mechanical properties. Modeling equations are developed to represent the flow curve. grain size. recrystallized volume fraction and grain growth phenomena by various tests. The developed modeling equations were combined with thermo-viscoplastic finite element modeling to predict the microstructure change evolution during hot forging process. The large exhaust valve spindle (head diameter of 512mm) was simulated by closed die forging with hydraulic press and cooled in air after forging. The preform was heated to each 1080 and 1150
. Numerical calculation was performed by DEFORM-2D. a commercial finite element code. Heat transfer can be coupled with the deformation analysis in a non-isothermal deformation analysis. In order to obtain the fine and homogeneous microstructure and good mechanical properties in forging. the FEM would become a useful tool in the simulation of the microstructure development. In forging, appropriate temperature, strain and strain rate and rapid cooling are required to obtain the fine grain microstructure The optimal forging temperature and effective strain range of Nimonic 80A for large exhaust valve spindle are about 1080
Performance analysis of
refrigeration cycle with two-phase ejector
Lee Yoon-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 29, issue 8, 2005, Pages 946~952
refrigeration cycle is expected to reduce the compressor work and increase the COP by applying two-phase ejector as a device for the recovery of dissipated expansion energy. In this study, the performance of the cycle was simulated and effects of the ejector shapes on the performance of the
refrigeration cycle were investigated. The following results were obtained through the cycle simulation. The COP of the
refrigeration cycle with two-phase ejector flow which expansion is occured in the isentropic manner is increased by a maximum of 24
than the basic cycle with expansion valve If the velocity nonequilibrium in the mixing process is assumed the COP of the cycle is increased with the increase of the length and the decrease of the section area of the mixing tube. The best cycle performance is obtained when the divergent angle of diffuser is 7.