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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Marine Engineering
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Journal DOI :
Korean Society of Marine Engineers
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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
Aerothermal Vortex Technologies in Aerospace Engineering
A. A. Khalatov ; Nam, Chung-Do ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 163~184
Vortex flow fundamentals have been investigating for about hundred years and many distinguished features had been discovered and comprehensively studied over that time. Due to unique hydrodynamic features vortex flows are now widely used in many industrial applications, including energy and power systems. combustion chambers. fuel sprayers. heat exchangers. clean-up systems. drying chambers. Up to recently aerospace engineers employed vortex flow only in combustion systems to stabilize a flame zone or in advanced heat exchangers to enhance heat transfer processes. This paper provides an overview of some recently developed aerothermal vortex technologies applied to aerospace engineering.
Speed Sensorless Vector Control for AC servo Motor Using Flux observer
Hong, Jeng-pyo ; Kwon, Soon-Jae ; Hong, Soon-Ill ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 185~191
This study describes the scheme of vector drive system without speed sensor for AC servo motor using theory of a flux observer and based on the field oriented vector control. The new method of speed estimation is presented from operate with the position and magnitude of the secondary flux which obtain from the voltage reference and detected current. As the estimated speed is settled by the flux and the machine-specific parameters. this method don't need to adjust the gain of the parameter. Based on the derived theory for vector control. the scheme for sensorless vector drive of AC servo motor is designed and realized. And the experiment verifies it passable to realize the sensorless vector drive based on a field-oriented type.
Development of Maneuvering Simulator for PERESTROIKA Catamaran using Fuzzy Inference Technique
Lee, Joon-Tark ; Ji, Seok--Jun ; Choi, Woo--Jin ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 192~199
Navigation simulators have been used in many marine schools and manne training centers since the early 1960's. But these simulators were very expens~ve and were almost limited only in one engine system. In this paper, a catamaran with twin engine system. controlled by two remote control levers and its economic simulator based on a personal computer shall be introduced. One of the main features of catamaran is to control variously its progressing direction. In the static state, a catamaran can move into all the directions and in the dynamic state, ship can change immediately the heading and speed. Although a good navigator can skillfully operate one engine system, it is difficult to control smoothly the catamaran of twin engine system without any threat for the safety of passengers. Thus. in order to bring up the expert navigators. the development of a simulator which makes the training effective is necessary, Therefore, in this paper, a Fuzzy Inference Technique based Maneuvering Simulator for catamaran with twin engine system was developed. In general. in order to develop a catamaran simulator for effective training, first of all. its mathematical model must be acquired. According to the acquired system modeling. the dynamics of simulator is determined, But the proposed technique can omit a complex and tedious mathematical modeling procedures by using the fuzzy inference, which dependent upon only experiences of an expert and can design an efficient training program for unskillful navigators. This developed simulator was consisted of two fuzzy inference routines and two remote control levers, and was focused on effective training of navigators for the safe maneuvering to avoid a collision in a harbor.
Implementation of Hardware Circuits for Fuzzy Controller Using
-Cut Decomposition of fuzzy set
Lee, Yo-Seob ; Hong, Soon-Ill ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 200~209
The fuzzy control based on
-level fuzzy set decomposition. It is known to produce quick response and calculating time of fuzzy inference. This paper derived the embodiment computational algorithm for defuzzification by min-max fuzzy inference and the center of gravity method based on
-level fuzzy set decomposition. It is easy to realize the fuzzy controller hardware. based on the calculation formula. In addition. this study proposed a circuit that generates PWM actual signals ranging from fuzzy inference to defuzzification. The fuzzy controller was implemented with mixed analog-digital logic circuit using the computational fuzzy inference algorithm by min-min-max and defuzzification by the center of gravity method. This study confirmed that the fuzzy controller worked satisfactorily when it was applied to the position control of a dc servo system.
Experimental Flow Visualisation of an Artificial Heart Pump
Tan, A.C.C. ; Timms, D.L. ; Pearcy, M.J. ; McNeil, K. ; Galbraith, A. ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 210~216
Flow visualization techniques were employed to qualitatively visualize the flow patterns through a 400％ scaled up centrifugal blood pump. The apparatus comprised of a scaled up centrifugal pump. high speed video camera. Argon Ion Laser Light Sheet and custom coded particle tracking software. Reynolds similarity laws are applied in order to reduce the rotational speed of the pump. The outlet (cutwater) region was identified as a site of high turbulence and thus a likely source of haemolysis. The region underneath the impeller was identified as a region of lower flow.
The Effect of Solution Heat Treatments on the Microstructure and Corrosion Behaviour for a Duplex Stainless Steel
Kim, Ki-Joon ; Lee, Joon-Goo ; Oh, Jae-Whan ; Lee, Myung-Hoon ; Moon, Kyung-Man ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 217~227
The bowl in a ship purifier suffers from high stress and high temperature in a detrimental heavy fuel oil environment. Duplex stainless steel(DSS) is a primary material to withstand this harsh condition. Newly-manufactured STS 329 grade DSS has been evaluated by various mechanical and electrochemical test methods. Eight heat treatment(HT) conditions with different temperature and time were applied to the DSS samples to improve corrosion resistance. Microstructure and polarization test results concluded the optimum HT condition was
-60 minutes. Confirmation experiments for applying to a real bowl including stress corrosion cracking test exhibited the reproducibility of the optimum HT condition.
A Study on the Neuro-Fuzzy Control and Its Application
So, Myung-Ok ; Yoo, Heui-Han ; Jin, Sun-Ho ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 228~236
In this paper. we present a neuro-fuzzy controller which unifies both fuzzy logic and multi-layered feed forward neural networks. Fuzzy logic provides a means for converting linguistic control knowledge into control actions. On the other hand. feed forward neural networks provide salient features. such as learning and parallelism. In the proposed neuro-fuzzy controller. the parameters of membership functions in the antecedent part of fuzzy inference rules are identified by using the error back propagation algorithm as a learning rule. while the coefficients of the linear combination of input variables in the consequent part are determined by using the least square estimation method. Finally. the effectiveness of the proposed controller is verified through computer simulation for an inverted pole system.
Speed Control System for Marine Diesel Engine Using Genetic Algorithm
So, Myung-Ok ; Oh, Sea-June ; Lee, Yun-Hyung ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 237~242
The conventional PID controller has been widely used in many industrial control systems although modern control theory has been remarkably developed recently. Because engineer can easily understand how to deal with the PID controller which consists of three parameters. This PID control method, however. has a tendency to depend on experience. Genetic Algorithm can search the control parameters according to systematic procedure in a selected plant. In this paper the real coded genetic algorithm is used to search proper values of the PID controller parameters for marine diesel engine. Simulation results show the effectiveness of the proposed scheme.
Heat Transfer Performance of Plate Type Absorber with Surfactant
Yoon, Jung-In ; M. M. A. Sarker ; Moon, Choon-Geun ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 243~251
Absorption chiller/heater can utilize the unused energy of the daily life waste heat, the industry waste heat. the solar energy and the earth energy. These can contribute to energy savings. But the absorption chiller/heater has a demerit that the size of absorption chiller/heater is larger than that of the vapor compression type based on same capacity. In this study. the experimental apparatus of an absorber is manufactured as a plate. which is newly applied in an absorber. The experimental apparatus is composed of a plate type absorber. which can increase the heat exchange area per unit volume and thus facilitating to deeply investigate more detail features instead of that done by the existing type. i.e.. horizontal tube bundle type. The characteristics of heat transfer and refrigeration capacity are studied experimentally. The absorption enhancement by using surfactant is closely examined through the experiment and comparative figures are presented in quantitative and qualitative analysis.
Numerical Analysis of Vertical Plate Absorber for Optimal Design
Yoon, Jung-In ; Moon, Choon-Geun ; Phan, Thanh-Tong ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 252~262
A model of simultaneous heat and mass transfer process in absorption of refrigerant vapor into a lithium bromide solution of water-cooled vertical plate absorber. which was considered to the change of refrigerant vapor pressure along the plate width direction. was developed to evaluate the compactness of plate absorber and supply basis data for optimal design of plate absorber. The effects of plate interval as well as the effect of capacity for one piece of plate absorber on plate absorber size such as plate height. plate heating area and plate absorber volume have been investigated. It is confirmed that there is exist an optimal plate interval minimizing plate absorber volume. And the smaller capacity for one piece of plate absorber. the smaller plate absorber volume is obtained.
2-D Simultaneous Measurements of Velocity and Diameter of Diesel Spray Droplets by Novel Interferometric Laser Imaging for Droplet Sizing (ILIDS) Method
Ryul, C.-S ; Y. Moriyoshi ; M. Yamada ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 263~268
The characteristics of Diesel spray droplets, such as the velocity and the diameter were simultaneously measured by using an improved Interferometric Laser Imaging for Droplet Sizing method. The experiments were carried out using an accumulator-type unit injector system and a constant-volume vessel. Two dimensional cross-section photographs of sprays were also taken using a double-pulsed Nd- YAG laser sheet and a linear array CCD camera. As a result, interesting relations between the droplets diameter and the velocity were found.
Combustion Pressure Monitoring System for Engine Control; By Simultaneous and Continuous Measuring of All Cylinders
Mihara, Y. ; Maruyama, Y. ; Okada, Y. ; Kido, H. ; Nishida, O. ; Fujita, H. ; Ito, M. ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 269~276
A marine diesel engine should realize optimal efficiency operation while reducing NOx. Fuel injection systems by electronic control can become effective means for that. Although it would be able to get more precise engine control compared to the mechanical injection system, it needs some accurate and instant information in order to bring its ability into full play while sailing on the sea. Very important information of them is shaft torque and continuous combustion pressure of all cylinders. The system presented in this report can deliver those data.
Flow Visualization and Measurement of Velocity and Temperature in Parallel Plates
Piao, R.-L ; Bae, D.-S ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 277~284
This paper describes the influence of through-flow on the mixed convection in a parallel plates with the upper part is cooled and the lower part heated. When forced convection is imposed on natural convection, it is found that the flow pattern of mixed convection in the parallel plates can be classified into three patterns which were affected by Reynolds number. In such a mixed convection, the flow pattern plays an important role in the heat transfer process. In this study, thermo-sensitive liquid crystal suspension method is employed, then the visualization image acquired through the above method is processed by the color image processing technique and the two-dimensional velocity vector and temperature configuration are measured simultaneously.
Characteristics of Piezoceramics Sensors for Vibration Detection
Tan, A.C.C. ; Dunbabin, M. ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 285~291
Early detection of an internal malfunction of machinery plays a very important part in all condition monitoring programs. Sensors to detect amplitude. velocity and acceleration are widely used in vibration detection and control. Piezoceramic materials are largely used in sensors and actuators for vibration monitoring and control due to their relatively large output from an induced strain and their arguable self powering characteristics. In this paper a cheap and yet reliable sensors/actuators were developed to detect vibration. The results show that low cost PZT can be designed for optimum detection of bearing vibration. This paper presents the experimental results of a number of piezoceramics characteristics in terms of resonant frequencies and variation of PZT constants with temperature.
Formation Characteristics of PM and SOF by Spray Combustion of Marine Heavy Fuel Oil
Kim, Houng-Soo ; Murakami, T. ; Nishida, Osami ; Fujita, H. ; Harano, W. ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 292~299
This study is intended to check a temperature of the flame to raise by burning A heavy oil in a boiler. to measure the concentration of DS and SOF after collecting the PM(Particulate Matters). and to analyze the components ingredients of SOF by G.C Mass for presupposing the generation of particulate matters(soot). It is thought that the methyl(CH3) of the cyclic compound is changed to the materials of 2 cycles and 3 cycles after becoming CH by dehydrogenation and also mixing with the CH of a chain compound. form H-
-H that is mentioned before. in order to become Polycyclic Aromatic Hydrocarbon.
Characteristics Comparison of Anodic Films Formed on Mg-Al Alloys by Non-chromate Surface Treatment
Kim, Seong-Jong ; Jang, Seok-Ki ; Kim, Jeong-Il ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 300~308
The formation mechanism of anodic oxide films on Mg alloys when anodized in NaOH solution. was investigated by focusing on the effects of anodizing potential. Al content. and anodizing time. Pure Mg and Mg-Al alloys were anodized for 10 min at various potentials in NaOH solutions.
was generated by an active dissolution reaction at the surface. and the product was affected by temperature. The intensity ratio of
in the XRD analysis decreased with increasing applied potential. while that of MgO increased. The anti-corrosion properties of anodized specimens at each constant potential were better than those of non-anodized specimens. The specimen anodized at an applied potential of 3 V had the best anti-corrosion property. And the intensity ratio of
/Mg increased with aluminum content in Mg-Al alloys. During anodizing. the active dissolution reaction occurred preferentially in
until about 4 mins. and then the current density increased radually until 7 mins. The dissolution reaction progressed in a phase(Mg) which not formed the intermetallic compound. which had a lower Al content. In the anodic polarization test of
at 298 K. the current density of Mg-15 mass% Al alloy anodized for 10 mins increased. since the anodic film that forms on the a phase is a non-compacted film. The anodic film on the phase for 30 mins was a compact film as compared with that for 10 mins.
A Study on the Operation Method of Photovoltaic/Diesel Hybrid Generating System
Park, Jae-Shik ; So, Myung-Ok ; Yoo, Heui-Han ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 309~314
The exhaust gas emission from marine diesel engines is one of the major environmental issues. The authors focus the use of photovoltaic energy for the electric power system on marine ships. This paper proposes an operation method of a photovoltaic/diesel hybrid generating system for a small ship in consideration of the fluctuating photovoltaic power due to solar radiation. The aim of the proposed operation method is to minimize the fuel consumption and storage capacity of the battery. The validity of the proposed control method is shown by the numerical simulation based on the experimental data of the photovoltaic system.
A Study on Effect of Intake Mixture Temperature upon Fuel Economy and Exhaust Emissions in Diesel Engines with a Scrubber EGR System
Bae, Myung--Whan ; Ryu, Chang-Seong ; Yoshihiro Mochimaru ; Jeon, Hyo-Joong ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 315~331
The effects of intake mixture temperature on performance and exhaust emissions under four kinds of engine loads were experimentally investigated by using a four-cycle. four-cylinder. swirl chamber type. water-cooled diesel engine with scrubber EGR system operating at three kinds of engine speeds. The purpose of this study is to develop the scrubber exhaust gas Recirculation (EGR) control system for reducing
and soot emissions simultaneously in diesel engines. The EGR system is used to reduce
emissions. And a novel diesel soot-removal device of cylinder-type scrubber with five water injection nozzles is specially designed and manufactured to reduce soot contents in the recirculated exhaust gas to the intake system of the engine. The influences of cooled EGR and water injection. however. would be included within those of scrubber EGR system. In order to survey the effects of cooled EGR and moisture on
and soot emissions. the intake mixtures of fresh air and recirculated exhaust gas are heated up using a heater with five heating coils equipped in a steel drum. It is found that intake and exhaust oxygen concentrations are decreased, especially at higher loads. as EGR rate and intake mixture temperature are increased at the same conditions of engine speed and load. and that
emissions are decreased. while soot emissions are increased owing to the decrease in intake and exhaust oxygen concentrations and the increase in equivalence ratio. Thus ond can conclude that
and soot emissions are considerably influenced by the cooled EGR.
Study on the Cavitation Damage of Cupronickel(70/30) Tube for Gas Absorption Refrigeration Machine
Lim, Uh-Joh ; Jeong, Ki-Cheol ; Yun, Byoung-Du ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 332~337
The use of gas absorption refrigeration machine has considerably increased because of the shortage of the electric power in the summer and the regulation of freon refrigerant. Gas absorption refrigeration machine consists of a condenser, a heat exchanger. supplying pipes, a radiator etc, This system is likely to be corroded by acid. dissolved oxygen and gases, Cavitation erosion-corrosion by flow velocity of cooling water may happen in absorption refrigeration machine. In these cases. erosion and corrosion occur simultaneously. Then, it makes a serious damage with synergy effect. Therefore, this paper was studied on the cavitation damage of cupronickel(70/30) tube for gas absorption refrigeration machine, In the
tap water, linear polarization test and anodic polarization test were carried out for copper(C1220T-OL) and cupronickel(70/30) tube. Also, cavitation erosion-corrosion behavior of cupronickel (70/30) tube was considered, The main results are as following: (1) In the linear test, the corrosion current density of cupronickel(70/30) is higher than that of copper. (2) The erosion-corrosion rate of cupronickel(70/30) displayed later tendency than that of copper by vibratory cavitation in cooling water. (3) In cooling water, the progress mechanism of erosion-corrosion rate of copper and cupronickel(70/30) follows a pattern of incubation, acceleration, attenuation and a steady state period.
Effect of the Gravity Forces on Flow Pattern and Frictional Pressure Drop in Two-Phase, Two-Component Flow
Choi, B.-H ; Han, W.-H ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 338~346
Experimental data on the effect of the variable gravity magnitude, namely microgravity, normal gravity and hyper-gravity, on flow pattern and frictional pressure drop were obtained during co-current air-water flow in a horizontal tube, The flow patterns were found to depend strongly on the gravity magnitude and certain flow pattern were found to depend on the gas superficial velocity. The effect of the gravity magnitude had an effect on the frictional pressure drop only at low flow rates. The present data are used to evaluate some of existing flow pattern transition and pressure drop models and correlations.
Recognition of the Korean Character Using Phase Synchronization Neural Oscillator
Lee, Joon-Tark ; Kwon, Yang-Bum ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 347~353
Neural oscillator can be applied to oscillator systems such as analysis of image information, voice recognition and etc, Conventional learning algorithms(Neural Network or EBPA(Error Back Propagation Algorithm)) are not proper for oscillatory systems with the complicate input patterns because of its too much complex structure. However, these problems can be easily solved by using a synchrony characteristic of neural oscillator with PLL(phase locked loop) function and a simple Hebbian learning rule, Therefore, in this paper, it will introduce an technique for Recognition of the Korean Character using Phase Synchronization Neural Oscillator and will show the result of simulation.
Development of the Pneumatic Rotary Actuator for Marine Winch
Kim, D.-S ; Lee, W.-H ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 354~360
It is well known that pneumatic actuators convert fluid power into mechanical power with a low efficiency. The pneumatic rotary actuators are used in not only marine winches. but also hoists, agitators, and excavators. The efficiency of pneumatic rotary actuators depends on several factors, such as type of actuator. speed, supply pressure. size and geometry of the actuator. This paper presents an analytical and experimental study of the performance of pneumatic rotary actuators. We investigate all the major aspects of the air flow through a pneumatic rotary actuator and points out the main causes of the low efficiency of the actuator. Therefore the design parameters which can lead to optimum performance are obtained.
A Study on the Optimal Design and Forming of the Alternator Housing
Han, Kyu-Taek ; Park, Jung-Sik ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 361~366
The die casting process was used to manufacture an automotive alternator housing. Generally automobile parts are required to be light and have high strength. The control of casting defects is important but has usually been depended only on the experience of the foundry engineer. Therefore simulations have been carried out on the die casting process of alternator housing. In this paper. we investigated the characteristics of the die casted alternator housing with the HPDC(High Pressure Die Casting) process. We presented the results of filling behavior and solidification process of the cast, The analysis results obtained from the filling behavior and solidification of cast agreed with test results.
Development of a Highly Efficient Boiler System Using a Diesel Engine
Lee, D.-H ; Lee, D.-Y ; Jo, M.-C ; Cho, H.-N ; Kim, Y.-S ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 367~375
We have developed a highly efficient boiler system using the 2,600cc Diesel engine. In this system, the co-generation concept is utilized in that the electric power is produced by the generator connected to the engine, and waste heat is recovered from both the exhaust gases and the engine itself by the shell-and-tube heat exchangers. The heat exchanger connected to the engine outlet is specially designed such that it not only recovers waste heat effectively from the exhaust gases, but significantly reduces an engine noise. It is found that the total efficiency(thermal efficiency plus electric power generation efficiency) of this system reaches maximum 96.3％ which is about 15％ higher than the typical Diesel engine boiler system currently being used worldwide.
Hydraulic Force and Impeller Evaluation of a Centrifugal Heart Pump
Timms, D.L ; Tan, A.C.C ; Pearcy, M-J ; Mcneil, K ; Galbraith, A ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 376~381
A rig was constructed to test the performance characteristics and compare the hydraulic forces exerted on a centrifugal type artificial heart impeller. A conventional shaft. seal and bearing system. while driven by a small electric motor. supported the impeller which was separated from the pump casing by a six degree of freedom force transducer (JR3 Ine). Radial (x. y) and axial (z) hydraulic forces were recorded and compared. At physiological operating conditions. the results indicate that the double entry/exit centrifugal pump encounters a smaller radial force and significantly reduced axial thrust. These experimental results are valuable in the design of a magnetic bearing system to suspend the impeller of a centrifugal artificial heart pump. This experimental technique may also be applied to evaluate the required capacity and predict the lifetime of contact bearings in marine pumps.
Vibration response of the boat composite shafting having constant velocity joint during change of the operation regime
Shuripa, V.-A ; Kim, J.-R ; Kil, B.-L ; Kim, Y.-H ; Jeon, H.-J ;
Journal of the Korean Society of Marine Engineering, volume 28, issue 2, 2004, Pages 382~392
The usage of constant velocity (CV) joint is effective for motorboats on gliding regime of the motion. During transition on the gliding when angle of the CV differs from null on driving and driven composite shafts there are moments of the second order. Excitation of oscillations of the second order moments occurs when driving shafts transmits a variable torque. which generates through CV joint a lateral moment acting on the bearing. As a result of oscillations from a resonating harmonic of a shafting the harmonic with the greater or periodically varying amplitude for power condition trough transferring to nominal power 144kW. Beating conditions coincide with third mode having frequency 45.486 Hz. In that case there is high increasing of the equivalent stresses. The forming of the stiffness of the composite material is concerned to use most orientation of the layer angle in the range of
60 degrees relatively of shaft axis. Application of that angles for layer orientation gives possibility to avoid high disturbance of the shafting for motorboat transition regime.