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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 23, Issue 6 - Nov 1999
Volume 23, Issue 5 - Sep 1999
Volume 23, Issue 4 - Jul 1999
Volume 23, Issue 3 - May 1999
Volume 23, Issue 2 - Mar 1999
Volume 23, Issue 1 - Jan 1999
Selecting the target year
Recent Developments and Future Prospects of Electronic Displays
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 609~621
A Study on the Development of Knowldege-based Computer Aided Manufacturing System for Mold Manufacturing(1) -On the modelling of feature based model and database processing with knowledge-
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 622~629
This paper presents the development of an interactive knowledge-based CAM system for design-ing and manufacturing the mold. The system is composed of two functional parts. One is the geo-metric modeller that uses the feature-based models. The models include base plate step, hole, pocket, boss and slot, These are designed by interactive user interface. The other is the expert sys-tem module with inference engine and knowledge database of workpiece material tools manufac-turing machines process an working conditions. With two parts the final mold shape is generated with manufacturing information for effective production.
A Study on Stabilization of Container Cranes Using an Optimal Modulation Controller
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 630~636
In this paper in optimal modulation controller for position control and anti-sway of container crane systems is designed by a recursive algorithm that determines the state weighting matrix Q of a linear quadratic performance. The optimal modulation controller is based on optimal control. The basic feature of the recursive algorithm is the reduction of the number of iterations as well as minimization of the calculations involved So in order to obtain a mathematical model which rep-resents the equation of motion of the trolley and load Lagrange equation is used. The optimal modulation controller has been verified and simulated to show that it is robust when a load dis-turbance is applied and a reference is changed.
The prediction of Performance in Two-Stroke Large Marine Diesel Engine Using Double-Wiebc Combustion Model
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 637~653
In this study well-known burned rate expressions of Weibe function and double Wiebe function have been adopted for the combustion analysis of large two stroke marine diesel engine. A cycle simulation program was also developed to predict the performance and pressure waves in pipes using validated burned rate function,. Levenberg-Marquardt iteration method was applied to cali-brate the shape coefficients included in double Wiebe function for the performance prediction of two-stroke marine diesel engine. As a result the performance prediction using double Wiebe func-tion is well correlated withexperimental dta with the accuracy of 5% and pressure waves in intake and transport pipe are well predicted. From the results of this study it can be confirmed that the shape coefficients of burned rate function should be modified using the numerical method suggested for the accurated prediction and double Wiebe function is more suitable than Wiebe func-tion for combustion analysis of large two stroke marine engine.
An Experimental Study on Engine Performance Characteristic of LPG Engine -Engine Perfermance Character at Various Compression Rations-
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 654~661
This is fundamental study to improve performance of the SI engine,. In this study a conven-tional kerosene engine was modified to LPG dedicated engine which can be operated with LPG(Liquefied Petroleum Gas) The modified model were tested in accordance with various compression ratios. Also the engine performance with modified model was compared with the conventional one. The results are sum-marized as follow; 1. In comparison with the conventional kerosene Gasoline engine and LPG dedicated engine can be operated with lower exhaust emission better fuel economy and better thermal efficiency. 2. But is produce a slightly lower brake horse power.
A Numerical Study on In-cylinder Flow Fields of an Axisymmetric Engine
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 662~670
A numerical prediction was performed to clarify the air motion in the cylinder of an axisymmet-ric four-stroke reciprocating engine at its intake and compression stage. A scheme of finite volume method is used for the calculation. Modified
turbulence model is adopted and wall function is applied to the grids near the wall. The predicted mean velocity and rms velocity profiles showed a reasonable agreement with an available experimental data at its intake and compression stage. The predicted in-cylinder flow fields show that a strong turbulent twin vortex structure is pro-duced during induction but it commences to decay rapidly around inlet valve closure. The mean velocity continues to fall to a low level during compression but the turbulence intensity attains an approximate constant level.
Optimum Design of a Heat Recovery Steam generator(I)
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 670~678
Heat recovery steam generator(HRSG) is a principal component of the combined cycle power plant (CCPP) which utilizes the waste energy of the gas turbine exhaust gas. A design of the HRSG is a keypoint to achieve high cycle efficiency with competitive cost. This paper presents a brief review on the design of a HRSG which covers the basic design parameters and their effects on the performance and the investment cost. Finally the concept of the optimum design point is presented according to the selection of a pinch point temperature difference and a steam pressure as an illustrated case.
Influence on Relative Electrode Wear by Material and Size of Electrode
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 671~677
This study has been performed to investigate REW(relative electrode wear) in condition of vari-ous pulse-on duration using the copper and graphite electrode with change of the electrode size on the heat treated STD11 which is extensively used for metallic molding steel with the EDM. The results obtained are as follows; a) Graphite has much benefits than copper electrode when rapid machining is done without electrode wear, b) Neative REW result from the electrode that is very liable attach to decomposition carbide c)Increasing of machining time cause to increase wear length of the copper electrode and decrease wear length of the graphite electorde d)The more pulse-on duration copper electrode has the less REW. e) The edge portion of the electorde wears remarkably at the beginning of machining,.
A Study on Preform Design in Plane-Strain Forging
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 678~685
A UBET program is developed for determining flash the optimum sizes of preform and initial billet in plane-strain closed-die forging. The program consists of forward and backward tracing processes. In the forward program, flash, die filling and forging load are predicted. In backward tracing process the optimum dimensions of initial billet and preform are determined from the final-shape data based on flash design. Experiments are carried out with pure plasticine billets ar room temperature. The theoretical predictions of forging load and flow pattern are in good agree-ment with the experimental results.
An Experimental Study on the Degradation of Polymer in Closed Flow System
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 679~686
This study is to investigate the effect of a substantial drag reduction caused by the polymer(A611P) when the working fluids flow to the vertical direction in the vertical cylindrical equipment of closed flow system. The drag reduction is associated with the mechanical degrada-tion thermal degradation and heat transfer. By ignore the heat fluxs within the closed system the pressure drop due to the polymer concentration the flow velocity and flow time have been mea-sured. By taking into account the mechanical and thermal degradation in the closed system an experiment has been focused on the determination of the condition which could improve the pump capacity in the heat union electric power plant. Under the condition of non-boiling it has been found out that the change of heat flux has little influence on the drag reduction.
Study on the Vibration Control Using Balance Weight for W/V-type Air Compressor
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 686~692
For the purpose of increasing compressed air pressure higher than 30bar lightening weight and decreasing installation area of air compressor used for shipboard and industrial power plant it is necessary to arrange its cylinders as a w-type or v-type construction multi-stage compression pro-cess more than two stages and to increase its operation speed higher than 1200rpm In this recip-rocating type air compressor operated in high speed having a crank mechanism and complicate cylinder arrangement there is a vibration problems which can be solved by balancing its recipro-cating parts with balance weight and approriate arranging of cylinder's arrangement angles.
The study on the estimation of heat transfer coefficient through the counterflow concentric tube using refrigerant and moisture air
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 687~694
This study was conducted to develop new drying process for automatic control and marine engi-neering system. Air-water tests were carried out to investigate dryer performance. The dispersed flow in he dryer test apparatuses was also simulated by using a numerical code which solves the Dittus-Boelter equation for continuous liquid phase and the Reynolds equation of droplet motion for continuous liquid phase and the Reynolds equation of droplet motion for dispersed phase to predict droplet removal efficiency. Proper conditions for dehumidification were optimized by response ambient conditions. When the selected indexes were constrained in the range of 85-98% moisture content above
and more than mass flow rates of moist air 750kg/h. The numerical results were compared with the experimental data pertaining to the removal effi-ciency at chamber stage and overall pressure drop along concentric tubes Good agreement was obtained as for the efficiency while relatively poor agreement was obtained for the relative humidity. The results also showed that the efficiency depended strongly on the relative humidity at the inlet condition which indicated the importance of estimating the heat exchanger length. Effects of some design parameters in both removal efficiency and breakthrough onset condition are discussed.
A Study on the Development of Digital Governor for Medium Speed Diesel Engine
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 693~699
In this paper author develops digital governor for medium speed diesel engine. The system is composed of MPU main control module RPM measuring module PWM driving module driver module for F.O. rack drive motor key pad and display module. Experiment results of speed control on 6cyl 1800pm 250kw Daewoo MAN diesel erigine were satisfied for design speci-fications and system could be developed for commercial usage after taking more experiments and endurance tests under various environments.
Study on the behavior of the Erosion-Corrosion for Ni-Cr Alloy Sprayed Coating in the Marine Environment
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 695~701
Thermal sprayed Ni-Cr alloy coating on the carbon steel was carried out erosion-corrosion test and electrochemical corrosion test in the marine environment. THe erosion-corrosion behavior and electrochemical corrosion characteristics of substrate(SS400) and thermal sprayed Ni-Cr coating was investigated, The erosion-corrosion control efficiency of Ni-Cr coating to substrate was also estimated quantitatively.
A Study on the Deformation Behaviour of Bellows Subjected to Internal Pressure
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 702~710
U-shaped bellows are usually used to piping system pressure sensor and controller for refriger-ator. Bellows subjected to internal pressure are designed for the purpose of absorbing deformation. Internal pressure on the convolution sidewall and end collar will be applied to an axial load tend-ing to push the collar away from the convolutions. To find out deformation behavior of bellow sub-jected to internal pressure the axisymmetric shell theory using the finite element method is adopted in this paper. U-shaped bellows can be idealized by series of conical frustum-shaped ele-ments because it is axisymmetric shell structure. The displacements of nodal points due to small increment of force are calculated by the finite element method and the calculated nodal displace-ments are added to r-z cylindrical coordinates of nodal points. The new stiffness matrix of the sys-tem using the new coordinates of nodal points is adopted to calculate the another increments of nodal displacement that is the step by step method is used in this paper. The force required to deflect bellows axially is a function of the dimensions of the bellows and the materials from which they are made. Spring constant is analyzed according to the changing geometric factors of U-shaped bellows. The FEM results were agreed with experiment. Using developed FORTRAN PROGRAM the internal pressure vs. deflection characteristics of a particu-lar bellows can be predicted by input of a few factors.
The Numerical Analysis on In-cylinder Flow Fields of an Axisymmetric Engine Using
Journal of the Korean Society of Marine Engineering, volume 23, issue 5, 1999, Pages 711~718
Current turbulence models including modified
turbulence model do not predict compression effect on turbulence accurately in an internal combustion engine. The
turbulence model was suggested to improve the predictability of compression effect by We et al. In this paper a numeri-cal study was performed to clarify the applicability of the
turbulenc model to the calculation of the in-cylinder flow of an axisymmetric engine. THe results using
turbulence model are compared to those from the modified
turbulence model and experimental data. The mean veloc-ity and rms velocity profiles using
turbulence model showed a better agreement with an experimental data than those of modifid