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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 28, Issue 8 - Nov 2004
Volume 28, Issue 7 - Nov 2004
Volume 28, Issue 6 - Sep 2004
Volume 28, Issue 5 - Jul 2004
Volume 28, Issue 4 - May 2004
Volume 28, Issue 3 - Mar 2004
Volume 28, Issue 2 - Jan 2004
Volume 28, Issue 1 - Jan 2004
Selecting the target year
Trend of New Technologies for Diesel Engines
Choi Jae-Sung ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1044~1054
A Study of Heat Flux According to the Initial Temperature of Combustion Chamber and Blight of Probe in a Constant Volume Combustion Chamber
Lee Chi-Woo ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1055~1062
As for the Production of internal combustion engines there has been further movement toward development of high Performance engines with improved fuel efficiency as well as a lightweight and a small size. These tendencies help to solve the problems in engines for example, such as thermal load. abnormal combustion and so on. In order to investigate these Problems, a thin film-type probe for measuring instantaneous temperature has been suggested. A method for manufacturing such a probe was established in this study The instantaneous surface temperature of a constant volume combustion chamber was measured by using this probe and the heat flux was obtained through Fourier analysis In order to thoroughly understand the characteristics of combustion. authors measured wall temperature of combustion chamber and calculated heat flux through a cylinder wall while varying the protrusion height of probe. For these Purposes, the instantaneous surface temperature probe was developed. thereby making possible the analysis of instantaneous temperature of wall surface and the detection of unsteady heat flux in the constant volume combustion chamber
A Study on the Calculation of Heat Release Rate to Compensate the Error due to Single Zone Assumption in Diesel Engines
Kim Ki-Doo ; Yoon Wook-Hyeon ; Ha Ji-Soo ; Ryu Seung-Hyup ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1063~1071
Accurate heat release analysis of cylinder pressure data is important for evaluating performance in the development of diesel engine However, traditional single zone first law heat release model(SZM) has significant limitations due to the simplified assumption of uniform charge and neglecting local temperature inside cylinder during combustion process. In this study. heat release rate based on single zone heat release model has been evaluated by comparison with computational analysis results using Fire code which is based on multi-dimensional model(MDM). To overcome limitations due to simplicity of single zone assumption. especially the influence of specific heat ratio on gross heat release has been esteemed and newly suggested were the equation
) which describes the variations of gases thermodynamic properties with mean temperature and maximum mean temperature inside cylinder Single zone heat release model applied with this equation is shown to give very good results over whole range of operating conditions when compared with computational analysis results based on multi-dimensional model.
An Experimental Study on the Effects of EFV of LPG Engine on Automobiles Acceration Performance
Jang Tae-Ik ; Kim Chang-Hun ; Kim Chul-Soo ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1072~1081
This paper is to investigate on the effects of the hole size of spring type EFV(excessive flow valve) for automobiles The analytical and experimental methods were employed to measure the discharge coefficient. choked flowrate and Pressure wave in a bombe, line and vaporizor The size of EFV was determined to meet the legally permitted limits with the capacity of engine displacement up to 2000cc, according to the obtained discharge coefficient. The Purpose of this paper is 1) to find causes of bad acceration performance in LPG engines 2) to find optimal design determination of spring coefficient and orifice hole size of excessive flow valve in LPG engine 3) to find pressure wave of bombe, line and vaporizer through expeimental verification. Experimental results indicated that increase of orifice size 0.5mm to 1mm be caused to increase discharge coefficient, and choked flow rate and decrease operation range of difference pressure wave.
A Parametric Analysis of Performance of Gas Turbine Combined, Split Cylinder, Constant Volume, Pressure, Temperature, Mixed Cycle Engine
Kim Dong-Ho ; Bae Jong-Uk ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1082~1091
Analyzed Parametrically was an internal combustion engine combined with gas turbine the cycle of which is splitted into compression side cylinder and expansion side one, and heat adding of which is during constant volume pressure, temperature process. The advantages of each measures were analyzed by means of thermal cycle diagram. The thermal efficiency of partial load cutting off firstly isothermal heat adding and secondly isobaric heat adding also was analyzed The authors suggested some potentials about the performance as for thermal efficiency, mean effective pressure and reducing emissions and noise supposed were the operating parameter of the engine set to some values and were some problems solved.
Fault Diagnosis of Screw type Air Compressor
Bae Yong-hwan ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1092~1100
This paper describes the application of fault tree technique to analyze of compressor failure. Fault tree analysis technique involves the decomposition of a system into the specific form of fault tree where certain basic events lead to a specified top event which signifies the total failure of the system. In this research. fault trees for failure analysis of screw type air compressor are made. This fault trees are used to obtain minimal cut sets from system failure and system failure rate for the top event occurrence can be calculated. It is Possible to estimate air compressor reliability by using constructed fault trees through compressor failure example. It is Proved that FTA is efficient to investigate the compressor failure modes and diagnose system.
Advanced One-zone Heat Release Analysis for IDI Diesel Engine
Kim Gyu-Bo ; Jeon Choung-Hwan ; Chang Young-Jun ; Lee Suk-Young ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1101~1110
An one-zone heat release analysis was applied to a 4 cylinder indirect injection diesel engine. The objective of the study is to calculate heat release accurately considering the effect of specific heat ratio. heat transfer and crevice model and to find out combustion characteristics of an indirect diesel engine considering the effect of the pressures in main and swirl chambers. Especially specific heat ratio indicating combustion characteristics is adapted. instead of that indicating matter properties, which has been used in former studies Moreover by adaption of blowby model, cylinder gas mass became accurately calculated. Therefore, with ideal gas equation, calculating cylinder gas temperature, it was found to affect heat transfer loss and heat release. Determining heat transfer constants
as 0.6 respectively. the integrated gross heat release values were predicted well for the measured value at various engine speed, full load operating conditions. The curve of heat release rate was similar to SI engine rather than DI engine. That is originated from that swirl chamber reduce an instant combustion which occurs in DI engine due to ignition delay on early stage of combustion.
Combustion Control and Symptom Detection on Self-excited Combustion Oscillation
Yang Young-Joon ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1111~1122
An idea to suppress the self-excited combustion oscillation was applied to the flames. The characteristics of unsteady combustion were examined and the unsteady combustion was driven by forced pulsating mixture supply that can modulate its amplitude and frequency. The self-excited combustion oscillation having weaker flow velocity fluctuation intensity than that of the forced pulsating supply can be suppressed by this method. The effects of the forced pulsation amplitude and frequency on controlling self-excited combustion oscillations were also investigated comparing with the steady mixture supply. The unsteady combustion used in this experiment plays an important role in controlling self-excited combustion oscillation. Symptoms of self-excited combustion oscillation were also studied in order to predict the onset of combustion oscillation before it proceeded to a catastrophic failure For the purpose, the unique measures to observe the onset of self-excited combustion oscillations based on the careful statistics of fluctuating properties in flames, such as pressure or emission of OH radicals, have been proposed.
A Study on the Optimization of Fuel Injection Nozzle Geometry for Reducing NOx Emission in a Large Diesel Engine
Kim Ki-Doo ; Ha Ji-Soo ; Yoon Wook-Hyeon ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1123~1130
Numerical simulations have been carried out to investigate the effect of nozzle hole geometry on the combustion characteristics of the large diesel engine. 6S90MC-C. Spray and combustion phenomena were examined numerically using FIRE code. Wane breakup and Zeldovich models were adopted to describe the atomization characteristics and NOx formation processes. Predictions on the cylinder peak pressure and NOx emission were first verified with the experimental data to confirm the reliability of numerical calculations. The comparison results showed good agreements within the range of 0.64% and 4.6% respectively. Finally, the effects of fuel spray angle and diameter on the engine performance were investigated numerically to find the optimum nozzle hole geometry considering fuel consumption, NOx emission and heat flux of the combustion chamber wall. It was concluded that the combustion gas recirculation in cylinder by changing fuel injection direction is an effective method to reduce NOx emission by about 10% with increasing fuel oil consumption, 1.4% in a large diesel engine.
A Study on the Fatigue Strength of Highly Skewed Propeller
Kang Nak-Hwoun ; Kim Jong-Ho ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1131~1137
Recently there has been a remarkable increase in the number of high speed and large ships and the high power involved for propulsion of above ships has brought high pitch ratio and highly skewed propeller. The recent tendency toward highly skewed propeller has increased the load on propeller blades, and the fatigue strength of propeller blades has become the critical point in design of propellers for ships. In this paper the effect of stress ratio and skew angle on the fatigue strength of highly skewed propeller, the statistical inference on the total revolutions of highly skewed propeller for 20 years under normal sea going state. and so on have been discussed. On the basis of above discussions, the highly skewed propeller blade thicknesses by the rules of classification society and the standards of manufacturer in country were compared and reviewed.
A Research on the Optimization of Turbocharging System in a Medium Speed Diesel Engine
Youn Wook-Hyun ; Gal Sang-Hak ; Ha Ji-Soo ; Kim Ho-Ick ; Kim Ju-Tae ; Kim Ki-Doo ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1138~1144
In order to improve engine performance while overcoming the weak points of Pulse and MPC(Modular Pulse Converter) turbocharging system, a new turbocharging system. "Hi-Pulse system", has been introduced and developed for medium speed diesel engine. HYUNDAI HiMSEN engines. Hi-Pulse system is to utilize not only the benefits of MPC system at higher load but also the ones of Pulse system at lower load. As for the results. the specific fuel oil consumption and NOx emission were lowered compared with the Pulse and MPC system. Performance simulation were carried out to optimize intake and exhaust timing and exhaust duct arrangement and to improve the performance of Hi-Pulse system engine.em engine.
Performance Characteristics of Cooling Tower on Small Absorption Chiller
Sarker M.M.A ; Kim Eun-Pi ; Jeong Seok-Kwon ; Min Kyung-Hyun ; Kim Jae-Dol ; Yoon Jung-In ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1145~1151
The experiment of thermal performance about cross flow type cooling tower was conducted in this study. Generally the ambient air condition can affect the thermal performance of cooling tower to improve or not. However it is hard to control the cooling water temperature that we want under bad air condition or during rainy season. In this paper, the effect of variables, which the ambient air have. especially wet-bulb temperature, are experimentally investigated for controlling the cooling water temperature more successfully. The result is that there is appropriate air flow rate in respective air condition to preserve the cooling performance in the cooling tower and the maximum air flow rate can't overcome the approach under bad air condition.
A Study on the Decoupling Sliding Mode Control
Park Jae-Shik ; Roh Young-Oh ; Ahn Byung-Won ; Nam Taek-Kun ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1152~1158
In this paper, a trajectory tracking problems using SMC(sliding mode control) is presented. In the conventional method. SMC has been applied to linear systems and the output matrix C has to satisfy a restrictive condition that CB is nonsingular. Under suitable assumptions, decoupling SMC can be adapted to remove the restriction mentioned above. The Proposed control strategy is applied to trajectory tracking control and simulations results are given to demonstrate the effectiveness of the proposed control scheme.
Optimal Central Control of OHT(Overhead Hoist Transport) in Semiconductor Processing
Oh Jin-Seok ; Kim Hak-Sun ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1159~1164
There is an Overhead Hoist Transport(OHT) for delivering the wafer in semiconductor processing. The transfer system is consists of carrier vehicle. rail, and support. OHTCMS(OHT Control and Management System) has to take the feature, such as the optimal control and integration with several OHT. In this paper, ESRA(Efficiency of Shortest - Route Algorithms) is proposed which can be transported optimal route and be prevented collision using the Floyd-Warshall algorithms. The proposed algorithm is verified through consecutive simulation for a long time.
A Study on the Optimal Position Determination of Point Supports to Maximize Fundamental Natural Frequency of Plate
Hong Do-Kwan ; Kim Moon-Kyung ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1165~1171
The free vibration analyses of the isotropic and CFRP laminated composite rectangular plates with point supports at the fix edge is performed by FEM. We showed optimal position and mode shape of point supports that maximized fundamental natural frequency of the isotropic and CFRP laminated composite rectangular plates by each aspect ratio and the number of point supports.
A Study on the rower Control of Magnetron for Microwave Oven
Kim Yoon-Sik ; Kim Jong-Soo ; Lee Sung-Gun ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1172~1177
This paper describes a output power control of magnetron for microwave oven. Magnetron is used extensively in household microwave oven and industrial microwave heating devices it is operated by 3000[V]～5000[V] dc high voltage. Power supply for driving magnetron is consisted of a bridge rectifier. HB(half bridge) inverter, full wave rectifier and gate drive circuit. In proposed system. we confirm that line input power can be controlled extensively and linearly to 24.56[%] by change of duty ratio of inverter through a experiment.
An Improvement of Performance in a Satellite Antenna Tracking Control System for Mobile DAB Reception
Jeong Joong-Sung ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 7, 2004, Pages 1178~1184
This paper presents the development of a satellite antenna tracking control system using a plane antenna for mobile DAB(Digital Audio Broadcasting) reception. To track more rapidly in the antenna of this system, this simple tracking system only tracks a direction of azimuth using pendulum in the direction of elevation. This system should track using the AGC(Automatic Gain Control) of the signal level which can receive DAB in spite of the changing of point and movement of the mobile. The directional gyro sensor is attached to solve the delay time in the Proposed tracking algorithm. The effectiveness of both the stabilization and tracking algorithm is demonstrated through experiment measuring AGC signal level. The implemented satellite antenna tracking control system is shown to be excellent for mobile DAB reception.