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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 31, Issue 8 - Nov 2007
Volume 31, Issue 7 - Nov 2007
Volume 31, Issue 6 - Sep 2007
Volume 31, Issue 5 - Jul 2007
Volume 31, Issue 4 - May 2007
Volume 31, Issue 3 - May 2007
Volume 31, Issue 2 - Mar 2007
Volume 31, Issue 1 - Jan 2007
Selecting the target year
Current Status and Prospect of Ship Vibration Technology
Kong, Young-Mo ; Choi, Su-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 322~334
DOI : 10.5916/jkosme.2007.31.4.322
A Study on the Analysis of Torsional Vibration of Branched Shafting System for Propulsion and Lift in Air Cushion Vehicle
Son, Seon-Tae ; Kim, Jung-Ryul ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 335~342
DOI : 10.5916/jkosme.2007.31.4.335
A propulsion and lift shafting system in an air cushion vehicle is flexible multi-elements system which consists of two aeroderivative gas turbines with own bevel gears, four stage lift fan reduction gear, two stage propulsion reduction gear air propellers and high capacity of lifting fans. In addition, the system includes the multi-branched shafting with multi-gas turbine engines and thin walled shaft with flexible coupling. Such a branched shafting system has very intricate vibrating characteristics and especially, the thin walled shaft with flexible couplings can lower the torsional natural frequencies of shafting system to the extent that causes a resonance in the range of operating revolution. In this study, to evaluate vibrational characteristics some analytical methods for the propulsion and lift shafting system are studied. The analysis, including natural frequencies and mode shapes, for five operation cases of the system is conducted using ANSYS code with a equivalent mass-elastic model.
A Study on Structural Design of Cryogenic Miniature Globe Valve using Finite Element Method
Jeong, Ho-Seung ; Cho, Jong-Rae ; Kim, Jeong-Hwan ; Kim, Jung-Ryul ; Park, Jae-Hyoun ; Kim, Young-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 343~349
DOI : 10.5916/jkosme.2007.31.4.343
This cryogenic miniature globe valve is used to transfer the liquified natural gas which temperature is
, supplied pressure is 30bar(3.0MPa). In the present work the temperature distribution and thermal deformation is calculated numerical the FE method is useful to predict the thermal matter of cryogenic miniature globe valve. For this reason, to optimum design of the cryogenic miniature globe valve the analysis of the parameter about bonnet has been studied. It's used 3-D modeling to analyze cryogenic globe valve, which is 1/2". Numerical study used 3-D modeling makes a decision of efficient process of product before producing in the factory. A commercial software(ANSYS 10.0) is used in the structural analysis for cryogenic globe valve.
A Study on Strength Design for Welded Joint of pad-eye Considering Sling Angle and a Steel Plate Thickness
Jeong, Ho-Seung ; Kim, Jung-Ryul ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 350~355
DOI : 10.5916/jkosme.2007.31.4.350
Pad-eye is connected to crane with sling. When block is lift, pad-eye have a various applied force. Applied force on pad-eye is related to sling angle. Sling angle is decided by various parameters, including pad-eye location, sling length and crane location. Welded joint on pad-eye requires strength design because sling angle changes force on pad-eye. Strength design for welded joint of pad-eye will calculate with general mechanical design and FE analysis. FE analysis would become a useful tool in the analysis of welded joint. A commercial software(ANSYS 10.0) was used in the structural strength analysis for welded joint of pad-eye.
Study on the Optimum Rotor Blade Design of the 1 kW HAWT by BEMT
Lee, Min-Woo ; Kim, Jeong-Hwan ; Kim, Jung-Ryul ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 356~362
DOI : 10.5916/jkosme.2007.31.4.356
The optimum design and the performance analysis software called POSEIDON for the HAWT (Horizontal Axis Wind Turbine) was developed by use of BEMT. The Prandtl's tip loss theory was adopted to consider the blade tip loss. The aerodynamic characteristics of NACA 63-415 airfoils were predicted via X-FOIL and the post stall characteristics were estimated by the Viterna's equations. All the predicted aerodynamic characteristics are fairly well agreed with the Velux wind tunnel test results. The rated power of the testing rotor is 1 kW at design conditions. The power, estimated by use of predicted lift and drag coefficient via X-FOIL becomes a little higher than experimental one.
Development and Analysis of the Highly Efficient Support System in a Liquid Hydrogen Vessel
Yun, Sang-Kook ; Park, Dong-Heun ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 363~369
DOI : 10.5916/jkosme.2007.31.4.363
Probably the most significant heat transfer in the cryogenic liquid hydrogen storage tank from the atmosphere may occur through its support system. In this paper the efficient support system for the cryogenic storage vessel was newly developed and analysed. The support system was composed of a spherical ball as a supporter to reduce the contact area. which is located between two supporting SUS tubes inserted SUS and PTFE blocks. Numerical analyses for temperature distribution, and the thermal stress and strain of the support system were performed by the commercial codes FLUENT and ANSYS. The heat transfer rate of the supporter was evaluated by the thermal boundary potential method which can consider the variation of thermal conductivity with temperature. The results showed that the heat transfer rate through the developed supporter compared with the common SUS tube supporter was significantly reduced. The thermal stress and strain were obtained well below the limited values. It was found that the developed supporter can be one of the most efficient support systems for cryogenic liquid storage vessel.
A Measurement Study on the Thermal Conditions in Cabins of a Long Cruise Passenger ship in the Winter
Hwang, Kwang-Il ; Woo, Sang-Woo ; Shim, Jae-Gun ; Park, Min-Kang ; Moon, Tae-Il ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 370~376
DOI : 10.5916/jkosme.2007.31.4.370
The purpose of this study is to measure the thermal conditions of the various cabins in a long cruise passenger ship which is an integration of the high level technological know-how. We did an experiment and found out the following problems. (1) The temperature from the damper is stable but the humidity varies lower. (2) Comparing A deck-located cabins to B deck-located cabins, A-deck located cabins' temperatures are higher because of the 24% more air supply. (3) More influences from outdoor climate makes the temperature of the outside cabin lower than the inside cabin. (4) In some cabins, there are vertical temperature differences of
. (5) And
temperature differences are occurred at between 2-story bed. (6) Repeatability of measurement results are confirmed by 2 times measurements.
A Study on Gamma TiAl Micro-structural Fracture with EBSD Technique
Kim, Yun-Hae ; Woo, Byung-Hoon ; Bae, Chang-Won ; Bae, Sung-Yeol ; Higo, Yakichi ; Moon, Kyung-Man ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 377~384
DOI : 10.5916/jkosme.2007.31.4.377
A backscatter Kikuchi diffraction attachment to an SEM enables the convenient investigation of grain orientations on bulk or micro surface. Their relation to micro structural features gives insight into many aspects of anisotropic materials properties. In micro area such as Micro Electro Mechanical Systems(MEMS) devices is required in order to improve understanding of how they may be expected to perform upon the micro scale. Electro Back Scatter Diffraction (EBSD) helps us to find uniform area as MEMS material. The
has two different lamellar structures
phase which have shows
plane indexing. The micro size testing specimen was successfully made by this structural relation. Interlamellar structure specimen averagely show
lower fracture toughness value compare with translamellar specimens Moreover micro fracture surface and micro crack progress were observed.
A Study on the Fatigue Crack Growth Characteristics of the Welded Part According to the Welding Method of Ship Structural Steel
Park, Kyeong-Dong ; Ki, Woo-Tae ; Lee, Ju-Yeong ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 385~393
DOI : 10.5916/jkosme.2007.31.4.385
The strength evaluation of the most weakest junction part is required for the safety design of all structures. Most of all. in order to enhance the reliability and safety of the welding part. whose use is the highest, it is very important to establish the efficient structure manufacturing technology by studying and investigating the evaluation of fatigue strength in various environments. This study analyzed the relations of da/dN, and th according to the welding methods of SMAW, FCAW, and SAW. In the stage II. the value of stress intensity factor range was the highest in SMAW welding method of stress ration R=0.1, and appeared under the sequence of FCAW and SAW and as the completion section of stress intensity factor was low, threshold stress intensity factor was lowly formed in da/dN - The fatigue life of each welding method is sensitively worked in high stress ratio. judging from the fact that the width of life reduction increases in the high stress ratio zone compared to the width of life reduction in the low stress ratio zone. In the fatigue limit of welding methods before corrosion. the welding of SMAW and FCAW shows the same fatigue limit compared to Base metal, and SAW holds the lowest fatigue limit value.
Weldability and properties of lap joints by pin FSW with 1050 Al sheet
Jang, Seok-Ki ; Park, Jong-Seek ; Han, Min-Su ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 394~400
DOI : 10.5916/jkosme.2007.31.4.394
The properties and weldability of lap joints by PFSW with 1050 Al sheet was investigated according to tool shape. dimension and welding condition. Tensile shear test was carried out for lap jointed specimen, and the hardness in the joint regions was examined. Moreover interfacial joining length, metallograph and failure location of the lap-jointed cross section were discussed. Two tool types were a simple cylindrical type and a notched cylindrical type. Under joining conditions such as plunging depth of 2.2mm. rotating speed of 1600rpm and dwelling time of 3s, the tensile shear strength of lap-jointed specimen by the notched type tool was superior to that by simple cylindrical type tool. The maximum tensile shear load of lap jointed specimen was 5807N. Optimal dimensions of the notched type tool were as follows : diameters of the shoulder and pin were
, and pin length was 2.2mm.
A Study on the Mechanical Behaviour of Steel-basalt Composite Pipe
Kim, Jong-Do ; Wang, Jee-Seok ; Yoon, Hee-Jong ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 401~409
DOI : 10.5916/jkosme.2007.31.4.401
Because of the various excellent characteristics of cast basalt materials. such as, anti-corrosion, anti-wearing, good hardness. high chemical stability, of which steel may not possess, the steel-basalt composite pipes are used in severe environments for compensating the defects of steel. However. without sufficient mechanical investigation prior to application. the basalt liners in steel-basalt composite pipes may be cracked and broken or the basalt liners are omitted from steel pipes in applications. In these cases, the merits of basalt materials may disappear and the basalt liners may not play their good roles as expected. Therefore, it is required that mechanical behavior of steel-basalt composite pipes and surrounding environments be fully examined before installation. The limit of bending moment with which steel-basalt composite pipe may safely endure is calculated and the limit curvature of the composite pipe in the safe range is presented in this paper. The temperature distributions and the thermal stresses are also computed and the limit difference of temperatures between inner and outer side of composite pipe is given together.
Electromagnetic and Thermal Analysis of Phase Change Memory Device with Heater Electrode
Jang, Nak-Won ; Mah, Suk-Bum ; Kim, Hong-Seung ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 410~416
DOI : 10.5916/jkosme.2007.31.4.410
PRAM (Phase change random access memory) is one of the most promising candidates for next generation non-volatile memories. However, the high reset current is one major obstacle to develop a high density PRAM. One way of the reset current reduction is to change the heater electrode material. In this paper, to reduce the reset current for phase transition, we have investigated the effect of heater electrode material parameters using finite element analysis. From the simulation. the reset current of PRAM cell is reduced from 2.0 mA to 0.72 mA as the electrical conductivity of heater is decreased from
). As the thermal conductivity of heater is decreased, the reset current is slightly reduced. But the reset current of PRAM cell is not changed as the specific heat of heater is changed.
Power Regenerating Drive of a Induction Motor by Field Acceleration Method
Hong, Soon-Ill ; Hong, Jeng-Pyo ; Jung, Seoung-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 417~424
DOI : 10.5916/jkosme.2007.31.4.417
This paper presents a solution that an analytical model for an induction motor and the formula of regenerative power and instantaneous torque are derived. based on the spiral vector. The torque is controlled linearly through variations of the slip angular velocity, based on the field acceleration method (FAM). And also PWM inverter fed induction motor drives is schemed to be easily a regenerative drive. The voltage source inverter fed induction motor drives that regenerative power occurs with back current type is presented, to easily controlled the feedback power and to proper the adaption of energy shaving drives. The experimental tests verify the performance of the FAM, proving that food behavior of the drive is achieved in the transient and steady state operating condition, and are discussed to save the power that regenerative power is measured at the operating acceleration or deceleration of servo system.
Development of Refer-container Remote Monitoring System for Ship using RF Module
Yang, Hyun-Suk ; Lim, Hyun-Jung ; Kim, Kun-Woo ; Kwon, Yeong-Gwal ; Kim, Dong-Mook ; Lee, Sung-Geun ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 425~432
DOI : 10.5916/jkosme.2007.31.4.425
This paper describes a development of ship's refer-container remote monitoring system(RRMS). This system consists of Master, repeater with a switched mode power supply(SMPS) and slave terminal. Slave terminal is composed of wireless MODEM and microprocessor part, checks its conditions like temperature. humidity & etc through the interrogate port(IP) of refer-container. and transmits their data to master. Repeater's role is that connect so that signal which is transmitted from Slave Terminal by Master may not receive electric wave interference by container boxes. We verify the effectiveness of proposed system through the experimental works in container yard and ship.
Driving Characteristics Improvement of SRM Winch System using Torque Sharing Function
An, Young-Joo ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 433~440
DOI : 10.5916/jkosme.2007.31.4.433
In this paper a new dynamoelectric winch system is introduced which is widely applied in shipping. building, architecture and so on. Generally in the winch system the squirrel cage induction motor is used as prime mover and line voltage is directly applied to the induction motor during operation. So it is difficult to obtain the smoothing revolution. because of variation of the weight of cargo and system operating method. Based on above reasons, the switched reluctance motor (SRM) is proposed to replace the induction motor because of more reliable mechanical structure, better traction characteristic and higher efficiency compared to induction motor. And in order to solve smoothing revolution problem, instantaneous torque control method based on torque sharing function (TSF) is used. Finally the validity of the proposed method is verified through the simulation and experimental results.
A Study on the New Parameter Estimation Technique of Direct Current Motor
Kim, Jong-Su ; Kim, Sung-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 441~447
DOI : 10.5916/jkosme.2007.31.4.441
The speed and torque control performance of the DC motor used in the industrial field is affected by the change of parameters. In particular the change of armature resistance can be greatly originated from various load conditions. Accordingly a large number of studies to estimate those problems in the servo motor control field have already been under way. In this paper, the armature resistance on the DC motor under several load and speed conditions is estimated by the Artificial Neural Network(ANN), and the validity is proven by the speed estimation of sensorless speed control system.
Tuning Rules of the PID Controller Using RCGAs
Kim, Min-Jung ; Lee, Yun-Hyung ; So, Myung-Ok ; Ha, Yun-Soo ; Hwang, Sung-Wook ; Jin, Gang-Gyoo ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 448~454
DOI : 10.5916/jkosme.2007.31.4.448
The new tuning rules of the PID controller for the rejection of load disturbance are proposed incorporating with real-coded genetic algorithms (RCGAs). The optimal gain parameters of the PID controller for a first-order plus time delay model are obtained based on a RCGA. Then tuning formula are derived using the tuned parameters sets potential tuning rule models and another RCGA. The performance criteria of the controller are adopted as ISE, IAE and ITAE. A series of simulation are carried out to verify the effectiveness of the proposed tuning rules.
High order chained system control using deadbeat and iterative control
Nam, Taek-Kun ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 455~461
DOI : 10.5916/jkosme.2007.31.4.455
In this paper a state steering strategy for high order chained system is presented. High order chained system can be derived from the acceleration constraints that cannot be integrable. The system classified as a nonholonomic system cannot be controlled to its equilibrium points by continuous and time-invariant controller. Using variable transformation two sub system can be obtained from the high order chained system. Deadbeat control and iterative state steering methods are proposed to control the system. Simulation results are given to show the effectiveness of the proposed control scheme.
Control of Inverted Pendulum Systems Using a State Observer
Lee, Yun-Hyung ; Ahn, Jong-Kap ; Jin, Gang-Gyoo ; So, Myung-Ok ;
Journal of the Korean Society of Marine Engineering, volume 31, issue 4, 2007, Pages 462~467
DOI : 10.5916/jkosme.2007.31.4.462
The design and synthesis of a state feedback controller assumes the feedback of all state variables of the system. However, some state variables are not physical quantifies so that sensors may not be available, or may be too expensive to measure. Hence, a state observer can be an alternative to estimate unmeasurable state variables. This paper therefore presents a scheme for state observer-based stabilization control of inverted pendulum systems. The feedback gain matrices of both the state feedback controller and the state observer are tuned by real-coded genetic algorithms(RCGAs) such that the given performance indices are minimized. The proposed method is demonstrated through simulations.