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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 32, Issue 8 - Nov 2008
Volume 32, Issue 7 - Nov 2008
Volume 32, Issue 6 - Sep 2008
Volume 32, Issue 5 - Jul 2008
Volume 32, Issue 4 - May 2008
Volume 32, Issue 3 - May 2008
Volume 32, Issue 2 - Mar 2008
Volume 32, Issue 1 - Jan 2008
Selecting the target year
The Present State of Affairs, Issues and Countermeasures on the Dumping of Wastes at Sea
Lee, Yun-Cheol ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 221~231
DOI : 10.5916/jkosme.2008.32.2.221
A Study on the Liability of the Builder in the Shipbuilding Contract and Products Liability
Jeong, Seon-Cheol ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 232~240
DOI : 10.5916/jkosme.2008.32.2.232
A Study on the Analysis of Lateral Vibration of Flexible Shafting System for Propulsion and Lift in Air Cushion Vehicle
Son, Seon-Tae ; Kil, Byung-Lea ; Cho, Kwon-Hae ; Kim, Jung-Ryul ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 241~249
DOI : 10.5916/jkosme.2008.32.2.241
In this study, lateral vibration analysis has been conducted on a propulsion and lift shafting system for an air cushion vehicle using ANSYS code. The shafting system is totally flexible multi-elements system including air propeller, aluminum alloy of lift fan and thin walled shaft with flexible coupling. The analysis included the lateral natural frequencies, mode shapes and harmonic analysis of the shafting system taking into account three-dimensional models for propulsion and lifting shaft system. In case of ACV the yawing and pitching rate of craft will be quite high. During yawing and pitching of craft significant gyroscopic moment will be applied to the shafting and will generate high amplitude of lateral vibration. So, such a shafting system has very intricate lateral vibrating characteristics and natural frequencies of shafting must be avoided in the range of operating revolution. The control of lateral vibration is included in this study.
Analysis of Stiffness for Frustum-shaped Coil Spring
Kim, Jin-Hun ; Lee, Soo-Jong ; Kim, Jung-Ryul ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 250~255
DOI : 10.5916/jkosme.2008.32.2.250
Springs are widely utilized in machine element. To find out stiffness of frustum-shaped coil spring, the space beam theory using the finite element method is adopted in this paper. In three dimensional space, a space frame element is a straight bar of uniform cross section which is capable of resisting axial forces, bending moments about two principal axes in the plane of its cross section and twisting moment about its centroidal axis. The corresponding displacement degrees of freedom are twelve. To find out load vector of coil spring subjected to distributed compression. principle of virtual work is adapted. And this theory was programming using MATLAB software. To compare FEM using MATLAB software was applied MSC. Nastran software. The geometry model for MSC. Patran was produced by 3-D design modeling software. Finite element model was produced by MSC. Patran. Finite element was applied tetra (CTETRA) having 10 node. The analysis results of the MATLAB and MSC. Nastran are fairly well agreed with those of various experiments. Using MATLAB program proposed in this paper and MSC. Nastran, spring constants and stresses can be predicted by input of few factors.
A Study on Proposing Practicable Configurations against Propeller Racing for SOFC/GT Hybrid System in Ships
Kim, Myoung-Hwan ; Lim, Tae-Woo ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 256~261
DOI : 10.5916/jkosme.2008.32.2.256
The purpose of this study is to propose practicable configurations against Rapid Load Down like propeller racing of ships which have been using SOFC/GT hybrid system on board. This paper suggests four kinds of countermeasures against propeller racing. The types A and B keep a fixed load of SOFC and save a surplus electric power to a storage system. In types of C and D, the load of SOFC is changed with the propeller racing. The best desirable countermeasure for Rapid Load Down depends upon the size of the ship, the propulsion power, and the characteristics of the engine system.
Research of Nitriding Process on Austenite Stainless Steel with Plasma Immersion Ion Beam
Kim, Jae-Dol ; Park, Il-Soo ; Ok, Chul-Ho ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 262~267
DOI : 10.5916/jkosme.2008.32.2.262
Plasma immersion ion beam (PIIB) nitriding process is an environmentally benign and cost-effective process, and offers the potential of producing high dose of nitrogen ions in a way of simple, fast and economic technique for the high plasma flux treatment of large surface area with nitrogen ion source gas. In this report PIIB nitriding technique was used for nitriding on austenite stainless steel of AISI304 with plasma treatment at
for 4 hours, and with the working gas pressure of
Pa in vacuum condition. This PIIB process might prove the advantage of the low energy high flux of ion bombardment and enhance the tribological or mechanical properties of austenite stainless steel by nitriding, Furthermore, PIIB showed a useful surface modification technique for the nitriding an irregularly shaped three dimensional workpiece of austenite stainless steel and for the improvement of surface properties of AISI 304, such as hardness and strength
Heat Transfer Analysis of a Thermal Storage System using the Ice Capsule of Bar and Ring Module
Kim, Myoung-Su ; Choi, Hyoung-Gwon ; Byon, Sung-Kwang ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 268~275
DOI : 10.5916/jkosme.2008.32.2.268
The shape and array of ice capsules are very important factors in ice thermal storage system because the heat transfer rate of the system strongly depends upon them. In this paper, a new type of ice capsule composed of bar and ring module is proposed to increase the efficiency of the ice thermal storage system. To investigate the heat transfer rate of the proposed ice capsule, numerical analysis of the incompressible Navier-Stokes equations is performed to compare the proposed bar and ring system with the conventional ice capsules. It is shown that the ice capsule composed of bar and ring has a higher heat transfer rate and a low outlet temperature than the conventional ice capsules for various packing ratios and entrance velocities. Furthermore, it is found that the optimal entrance velocity exists between 0.005 m/s and 0.007 m/s from the present numerical analysis
A Measurement and Evaluation on the Indoor Thermal Conditions in Summer of a New Training ship
Shin, Dong-Keol ; Lee, Jin-Uk ; Lee, Hyong-Ki ; Hwang, Kwang-Il ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 276~283
DOI : 10.5916/jkosme.2008.32.2.276
The purpose of this study is to measure and analyze the ship's indoor thermal conditions and also to integrate experimental database of those which are supplied and controlled by marine HVAC. On this study, temperature, humidity and air volume of 6 different needs' cabin are measured like previous report on a newly-launched training ship during 25th through 27th of July, 2007. Followings are the results of this study. (1)The air supply volumes to each cabins are measured 250CMH(Recreation room), 800CMH(Conference room), 1.000CMH(Bridge), 5,100CMH(Lecture room) respectively. (2)The temperatures are maintained at
in almost cabins through measuring period, but the temperatures are fluctuated over
at the bridge and conference room. (3)The relative humidities are shown between
known as comfort conditions, but the conference room is needed to dehumidified because of over 70% humidity. (4)From the student cabins' measurements which have different supply diffuser(s), it is clear that the design is suitable for this case. (5)Because of temperature diversities, only 32% among the measured data are satisfied with the comfort standard range proposed by ASHREA.
A Study on Aerodynamic Design and Flow Characteristics of a Centrifugal Compressor for SOFC-Gas Turbine Hybrid System
Choi, Jae-Ho ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 284~291
DOI : 10.5916/jkosme.2008.32.2.284
This study presents an aerodynamic design and numerical analysis of a centrifugal compressor in gas turbines for SOFC-gas turbine hybrid system application. Total-to-total pressure ratio of the compressor is 3.6:1 that could be used widely for small and large SOFC-gas turbine systems. The compressor consists of a centrifugal impeller and a wedge diffuser. Conceptual design and aerodynamic design with mean line analysis and quasi-3D analysis are performed, and aerodynamic parameters as well as design variables are discussed from the design results. A numerical analysis based on the Reynolds-averaged Navier-Stokes equation was performed for the flow analysis of the compressor. The results show that the centrifugal compressor designed meets the design target, and the aerodynamic parameters and results of the compressor can be used for the aerodynamic design of centrifugal compressors and the feasibility study of SOFC-gas turbine system design.
A Study on the Ice-on-coil as a Static Ice Making Type
Kim, Myoung-Jun ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 292~298
DOI : 10.5916/jkosme.2008.32.2.292
This study was experimentally investigated to understand the ice making characteristics of ice on a coil type ice maker. The experiment was carried out under the following conditions which are the brine temperatures of
, brine flow velocities of 1.0[m/s], 1.4[m/s], 1.8[m/s] and initial water temperatures of
, ect. The acquired conclusions shows: 1) Ice making amount is increased with decreasing in the temperature of brine. 2) Total ice making amount shows higher value in larger size coil. However, the ice making amount per heat transfer area is increased in smaller one. 3) The ice making amount is increased with decreasing in the initial water temperature. 4) It is cleared that the overturn of natural convection existed in this experimental result.
Numerical Analysis on Natural Convection of Water in a Rectangular Vessel
Kim, Myoung-Jun ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 299~305
DOI : 10.5916/jkosme.2008.32.2.299
This present study has dealt with the natural convection of water in a rectangular vessel which has cooling point at the center of itself with numerically. The finite difference method (FDM) is presented for the two-dimensional computer simulation of water controlled by natural convection and heat conduction. According to this study, It is cleared that the overturn of density is clearly existed at the temperature of
and that was compared with experimental result. Also the change of natural convection is known from the streamlines and isotherms. Most of all. It is cleared that the overturn of natural convection is changed with time caused by the fact that the temperature and density relationship of water.
A Study on Processing of Monolithic Rack Housing for Modular Steering Gear[I] - The Weldability of SAE1020 Steel by Different Heat Sources -
Kim, Jong-Do ; Lee, Chang-Je ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 306~314
DOI : 10.5916/jkosme.2008.32.2.306
General metal welding occurs distortion. Also, reducing distortion is required much cost. Therefore, the purpose of this study is optimization of welding conditions to reduce distortion in welding of monolithic rack housing for modular steering gear. Firstly, heat source for welding was chosen arc and laser. Secondly, it investigated optimizing welding conditions in bead welding by arc and laser heat source, and welding conditions in fillet welding was optimized with welding shapes. Finally, it was measured temperature distribution of welds by infrared camera and angle distortion in fillet welding. As a result, laser welding was superior to arc welding on distortion.
Lab Weldability of Pure Titanium by Nd:YAG Laser
Kim, Jong-Do ; Kwak, Myung-Sub ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 315~322
DOI : 10.5916/jkosme.2008.32.2.315
Titanium and its alloys have excellent corrosion resistance, high strength to weight ratios and creep properties in high temperature, which make them using many various fields of application. Especially, pure titanium, which has outstanding resistance for the stress corrosion cracking, crevice corrosion, pitting and microbiologically influenced corrosion, brings out to the best material for the heat exchanger, ballast tank, desalination facilities, and so on. Responding to these needs, welding processes for titanium are also being used GTAW, GMAW, PAW, EBW, LBW, resistance welding and diffusion bonding, etc. However, titanium is very active and highly susceptible to embrittlement by oxygen, nitrogen, hydrogen and carbon at high temperature, so it needs to shield the weld metal from the air and these gases during welding by non-active gas. In this study, it was possible to get sound beads without humping and spatter with a decrease of peak power according to increase of pulse width, change of welding speed and overlap rate for heat input control, and shield conditions at pulsed laser welding of titanium plates for Lap welding.
Power Characteristic Analysis of Assumed Short Circuit Instance of Electric Ship Propulsion System
Jeon, Won ; Wang, Yong-Peel ; Jeong, Jong-Hwa ; Lyu, Sung-Kak ; Jung, Sang-Yong ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 323~329
DOI : 10.5916/jkosme.2008.32.2.323
This paper deals with modeling and characteristic analysis of a large-powered electric ship propulsion system. Particularly, system modeling in accordance with the required shipping performance, building-up the equivalent circuit and the power analysis based on load flow have been performed. In addition, abnormal operating condition of short-circuit network is considered for investigating the safety of system components under the over-load condition. Furthermore, protective device like circuit breaker has been specified in order to make the entire system operate normally in case of short-circuit emergency.
Development of Short-Wavelength Transmission Line Employing Periodically Perforated Ground Metal for Application to Miniaturized On-chip Passive Components on Si RFIC
Joh, Han-Nah ; Park, Young-Bae ; Yun, Young ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 330~335
DOI : 10.5916/jkosme.2008.32.2.330
In this study, highly miniaturized short-wavelength transmission line employing periodically perforated ground metal (PPGM) structures were developed for application to miniaturized on-chip passive component on Si RFIC. The transmission line employing PPGM structure showed shorter wavelength and lower characteristic impedance than conventional coplanar-type transmission line. The wavelength of the transmission line employing PPGM structure was 57% of the conventional coplanar-type transmission line on Si Radio Frequency Integrated Circuit (RFIC) substrate. Basic characteristics of the transmission line employing PPGM structure were also investigated in order to evaluate its suitability for application to a development of miniaturized passive on-chip components. According to the results, it was found that the PPGM structure is a promising candidate for application to a development of miniaturized on-chip passive components on Si RFIC.
Simple Tuning Methods of PID Controller for Integrating Processes with Time Delay
Lee, Yun-Hyung ; Jin, Gang-Gyoo ; So, Myung-Ok ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 336~342
DOI : 10.5916/jkosme.2008.32.2.336
Simple tuning methods of PI, PD and PID controller are proposed for an integrating process with time delay. This is based on matching the coefficients of corresponding powers of s in the numerator and that in the denominator of the closed-loop transfer function. For set-point tracking problem, the derived controller is found to be a PD controller which is shown by Lee's tuning rule based on minimizing the performance indexes (ISE, IAE, ITAE) using a real-coded genetic algorithm. A method can be also proposed PI, PID controllers according to tuning parameter lambda
similar to IMC method. Simulation example is given to illustrate the set-point tracking and disturbance rejection performance of the proposed method.
Design of Ultra-light Robot-arm Capable of Carrying Heavy Weight
Choi, Hyeung-Sik ; Cho, Jong-Rae ; Leem, Kun-Wha ; Lee, Jong-Hoon ; Kim, Young-Hwan ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 343~350
DOI : 10.5916/jkosme.2008.32.2.343
In this paper, a six degree-of-freedom robot arm which is very light but capable of delivering heavy loads was studied. The proposed robot arm has much higher load capacity than conventional robot arms actuated by motors with speed reducers such as the harmonic drive since a new type of robot actuator based on a closed chain mechanism driven by the ball screw was adopted. Analysis on the design scheme and on the mechanism of the joint actuator of the robot arm were made. Since the robot arm was designed very light, it has deflection in the links. To analyze this, a finite element analysis on the structure of the designed robot links was made using ANSYS software. Verifying experiments on the performance of high load capacity of the robot arm was performed by loading heavy weights on the robot arm. Through experiments. the correctness of the numerical analysis was also verified.
An Implementation of a Mobile Robot Based on Map Building and Traveling Algorithm
Kim, Jong-Hwa ; Kim, Jin-Kyu ; Lim, Jae-Kwon ; Han, Seong-Bong ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 351~358
DOI : 10.5916/jkosme.2008.32.2.351
This paper introduces a map building algorithm which can collect environmental information using ultrasonic sensors. And also this paper discusses a traveling algorithm using environmental information which leads to the map building algorithm. In order to accomplish the proposed traveling algorithm, this paper additionally discusses a path revision algorithm. For verifying the proposed algorithms, several experiments are executed using a mobile robot physically designed in this paper. The conclusion is that the proposed algorithm is very effective and is applicable to mobile robots especially requiring a low-cost environmental information.
Settlement Characteristics of Three Type of Artificial Reefs on Sandy Bottom in the Eastern Coast of Korea
Kim, Dae-Kweon ; Kim, Wan-Ki ; Son, Yong-Soo ; Yoon, Jang-Tack ; Gong, Yong-Gun ; Kim, Young-Dae ; Lee, Ji-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 359~364
DOI : 10.5916/jkosme.2008.32.2.359
Using multi beam echo sounder, side scan sonar and scuba diving equipment, ceramic type, uneven type and semicircle-ramus type reefs into sandy bottom were ascertained, the depth of submersion in 7.2-10.3m on the coast of Gangneung, East of Korea, forty uneven type artificial reefs(AR) were totally buried into the sandy bottom. Two of five semicircle-ramus type ARs had only of their top area exposed. For most of the 45 ceramic reefs, only the upper 25-150cm of ARs were visible. The burial pattern is different in west and east side of the reefs, where the east side is deeply buried compared to the west side. From these results. it is recommended that sufficient analysis of bottom structure and materials especially in the sandy sea area should be undertaken in order to determine the best type of artificial reefs to be deployed and the best location for depoloyment.
An Experimental Study on Properties of Seabed Unconsolidated Sediment for Wind Power System Construction
Yoo, Hyun-Jong ; Lim, Jong-Se ; Shin, Sung-Ryul ; Jang, Won-Yil ; Yoon, Ji-Ho ;
Journal of the Korean Society of Marine Engineering, volume 32, issue 2, 2008, Pages 365~373
DOI : 10.5916/jkosme.2008.32.2.365
When the wind power system is planned to construct, it is important to understand the physical, chemical and mechanical properties of sediment. Especially, If it is the seabed unconsolidated sediment, we need to experiment on sediment through seabed unconsolidated sediment test and sediment survey. Because the sediment's properties are different as its formation, accumulation and load, unconsolidated sediment is difficult to be expected to its behavior. So we can estimate suitability for mechanical material and decrease the uncertainty through seabed unconsolidated sediment test. Seabed unconsolidated sediment test can be experimented in laboratory or in-situ as purpose, in-situ condition, economic problem. In this study, we sampled the seabed unconsolidated sediment at offshore around Korea Maritime University and measured properties of sediment through the laboratory test, showed the effect on physical properties of seabed unconsolidated sediment when the wind power system is planned to construction.