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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 17, Issue 5 - Oct 1993
Volume 17, Issue 4 - Aug 1993
Volume 17, Issue 3 - Jun 1993
Volume 17, Issue 2 - Apr 1993
Volume 17, Issue 1 - Feb 1993
Selecting the target year
A Study on the Thermal Design of the Cryogenic LNG Carrier
Journal of the Korean Society of Marine Engineering, volume 17, issue 4, 1993, Pages 1~10
This paper introduces the outline of hull structure to the sorts of LNG carrier briefly. Especially, explains in detail for the insulation system of Moss Rosenberg Verft spherical tank type LNG carrier. It is not easy task to calculate exactly the temperature distribution of hull because of very complicated structure of hull. Therefore, in this paper by the adequate modeling of the Moss Rosengerg spherical tank type LNG carrier, a program is developed which calculate the temperature distribution of every hull and estimate the heat influx from every hull and output the BOR according to the variation of atmospheric conditions on boyage.
A Study on Stability and Performance Characteristics in Aero - Valved Pulsating Combustion System
Journal of the Korean Society of Marine Engineering, volume 17, issue 4, 1993, Pages 11~19
The experimental study was carried out to investigate the stability and the performance characteristics of the aero-valved pulsating combustion system with maximum operating capacity of 60KW. The effect of geometry of combustion system on the stable condition, the flammability limit, the total pressure oscillation amplitude, and the operating frequency can be identified, and the maximum turn-down-ratio is obtained up to 3.3. The total pressure oscillation amplitude can be controlled by tunning the length of the air inlet pipe. The empirical equation with which the operating frequency can be approximated is proposed and the discrepancy is within 5%. The volumetric efficiency is identified to be one of the important parameters determining the upper flammability limit and the maximum value of which is approximately 22%.
Emulsified Oily Wastewater Treatment by MHD Water Treatment Device
Journal of the Korean Society of Marine Engineering, volume 17, issue 4, 1993, Pages 20~27
Emulsified oily wastewater is generally hard to treat in separating oil and water by conventional separators. In this paper the magnetohydrodynamic water treatment device was used to separate oil from emulsified oily wastewater which contained high conductivity. The emulsified oil removal rates and economic ranges of oil separation at various factors were investigated to confirm the influence of the magnetic field in MHD water treatment device according to the characteristics of emulsion brake. Experimental results proved that the oil removal rates were proportional to Lorentz force which depends on the intensity of magnetic field, conductivity and velocity of wastewater.
A Study on the Behavior Characteristics of TGL Vortex
Journal of the Korean Society of Marine Engineering, volume 17, issue 4, 1993, Pages 28~37
Flow characteristics within the three-dimensional square cavity are studied experimentally by adopting PIV(Particle Image Velocimetry). A new method for tracking the same particle pairs in the consecutive flow image is suggested resulting in more effective acquisition of the velocity vectors. Two methods for supplying the shearing stress within the cavity are developed by continuous moving belt and 2-dimensional plane Poiseuille flow. The effect of TGL vortex in the case of belt-moving flow is remarkable owing to the distribution of the kinetic energy in the spanwise direction. But, for the plane Poiseuille flow, velocity profiles similar to a forced vortex are obtained and its tendency increases with the Reynolds number.
Study on Friction Welding of SUS431 and SCM21 for External Shaft of Ship
Journal of the Korean Society of Marine Engineering, volume 17, issue 4, 1993, Pages 38~48
A study on friction welding of stainless steel bar(SUS431) to chrome molybdenum steel bar(SCM21) was accomplished experimentally through analysis for relations among friction welding conditions, tension test, hardness test, microstructure test and acoustic emission test. The results obtained are summarized as follows ; 1. Through friction welding of SUS431 bar to SCM21 bar, the optimum welding condition by considering on strength and toughness was found to be the range of heating time of 3-5 sec when the number of rotating speed of 2000rpm, heating pressure of 10kg/
, and upsetting time of 4 sec. 2. Quantitative ralationship was identified between heating time(
, sec) and tensile strength (
) of the friction welded joint and the relation equation is
. 3. Through AE test, quantitative relationship was confirmed between heating time(
, sec) and total AE(N, counts) during welding, and the relation is computed as follows ; N=30413.6
. 4. It was confirmed that the quantitative ralationship exists between the tensile strength of the welded joints and AE cumulative counts. And the relation is computed as the following ;
=16.37(ln N)- 116.4. 5. When ONZ=36500-41500 counts by
=3~5sec, it was identified by experiment that the range of welded joint tensile strength is 55.6-57.7kgf/
/ whose joint efficiency is more than 100%, and it was experimentally confirmed that the real-time nondestructive quality(strength) evaluation for the friction welded joints could be possible by acoustic emission technique.
A Study on the Injection Characteristics of Fuel Supply System of Diesel Engine
Journal of the Korean Society of Marine Engineering, volume 17, issue 4, 1993, Pages 49~62
It has been a principle research topic on the diesel engine development to increase the efficiency and the performance of engine to satisfy the user's needs for high reliability and durability. However, recently with the worldwide concerns at the global climate change and environmental protection, the main target in the diesel engine research has been changed to solve the exhaust emission problem in order to satisfy the strict emission regulations. To reduce the pollutant for the diesel engine, the researchs on the combustion chamber is the most important and has to be performed first of all. The diesel fuel injection system plays major role to air-fuel mixing process and influences engine output, themal efficiency, reliability, noise, and emissions. The experimental studies were conducted by varying the various parametric conditions and the results were campared with the computation and calculated results by using the fuel injection simulation program developed during previous research. From the experiments, the matching technique of a fuel injection pump and nozzle was conducted to understand under the various parametric conditions. Also, the relations between needle lift and wave propagation characteristics in high pressure pipe were examined. The basic design data from the experimentations and computation works would be applied to actual design works of diesel fuel injection system.
A Study on the Determination of the Main Design Parameters for the Development of Marine Stirling Engines
Journal of the Korean Society of Marine Engineering, volume 17, issue 4, 1993, Pages 63~72
This paper deals with the determination of the main design parameters on the efficient .betha. type stirling engine for marine use having the rhombic drive mechanism. This studies are performed as following. (1) The characteristics of
type stirling engine, (2) The kinds of driving mechanism, (3) The structure of rhombic drive mechanism, (4) The reasons of making choice of the rhombic drive mechanism in
type stirling engines, (5) Ultimately the purpose of this paper is to determine the main design parameters of
type stirling engines for marine use having the rhombic drive mechanism. Finally, We can adapt the result of this paper in designing of
type stirling engine driven by the rhombic drive mechanism.
A Study on Automation of Hydraulic Motor Performance Test
Journal of the Korean Society of Marine Engineering, volume 17, issue 4, 1993, Pages 73~79
Design of Control System for Electric Vehicles
Journal of the Korean Society of Marine Engineering, volume 17, issue 4, 1993, Pages 80~86
This paper presents an advanced AC drive system used in electric vehicles. The system consists of a drive motor, a PWM transistorized inverter, a PCL-812PG data card, and a controller. This paper describes a design method for RSPWMSS and PID controller. This controller system is implemented on computer and applied to drive motor(induction motor), yielding satisfactory result.
Static and Dynamic Characteristics of Electro - hydraulic Proportional Throttle Control Valve
Journal of the Korean Society of Marine Engineering, volume 17, issue 4, 1993, Pages 87~99
Nowadays, the cartridge valve can be controlled proportionally in remote place by adopting proportional solenoid and it becomes widely used as control component in hydraulic systems. Especially, multi stage proportional valve is attractive because it consumes less input power though its characteristics might slightly be defected. But, the system parameter should be carefully chosen to obtain optimistic characteristics. This study concerning three stage proportional throttle control valve is purposed to examine the influences of paameters to the dynamic characteristics. The typical transient and frequency responses of proportional throttle control valve were inspected through the experiments and compared to those derived from the theoritical analyses. And it was confirmed that the analyses are appropriate. Then the influences of various system parameters to the dynamic characteristics were examined by means of simulations. For the analyses, the basic equations derived from lumped model were linearized and the linearized equations were transformed to the transfer functions between inputs and outputs. Then the transient responses and frequency responses were obtained from transfer functions. 1. It is appropriate to estimate the dynamic characteristics of valve which has relatively sophisticated structure by means of system analyses using linearized equations. 2. Though the valve has two pilot stages, fairly good characteristics can be obtained by carefully choosing system parameters. 3. Main valve very quickly follows the movement of second pilot valve when the parameters of main valve(the oil supply passage and discharge passage fpr second pilot valve) are appropriately chosen.
Study on Friction Welding of Copper to Aluminium for Developing Electrical Sleeve
Journal of the Korean Society of Marine Engineering, volume 17, issue 4, 1993, Pages 100~106
A study on optimizing the friction welding of copper(C1100) to aluminium(A1050) for developing the electrical sleeve was experimentally carried out and also on real-time nondestructive evaluation of the friction weld quality (strength) was accomplished by acoustic emission technique. The results obtained are summarized as the following ; 1) The heating upset
(mm) or total upset U(mm) tends to increase according to the increase of heating time
(sec). The relations between
or U and
are computed as follows when n=2000rpm,
. 2) It was notified that the proper welding conditions by considering on both strength with more than 100% joint effieciency and toughness are heating time of 1.5-2.25 sec under n=200rpm,
=6sec. 3) It was confirmed that both AE total counts(N, counts) and the weld tensile strength (
) of the welded joints increase as the increase of heating time, respectively, the relations between N and
are computed from data points by regression analysis using the least square method as follows in case of the above proper condition ; N=50108+23917(ln
). 4) Both empirical and calcularated equations of relationship between .sigma. and N are very coincident with a high reliability, as the following in case of the above proper welding condition ; Calculated :
=0.00008N+7.5 Empirical :
. 5) It was confirmed that the real-time nondestructive weld strength evaluation for friction welding of copper(C1100) to aluminium(A1050) could be possible by acoustic emission technique.