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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 30, Issue 8 - Nov 2006
Volume 30, Issue 7 - Nov 2006
Volume 30, Issue 6 - Sep 2006
Volume 30, Issue 5 - Jul 2006
Volume 30, Issue 4 - May 2006
Volume 30, Issue 3 - May 2006
Volume 30, Issue 2 - Mar 2006
Volume 30, Issue 1 - Jan 2006
Selecting the target year
The material and welding technology for Al ship
Kim Seong-Jong ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 5, 2006, Pages 540~551
Study on Combustion Characteristics of Diesel Fuel and Low Quality Oil Droplet with Additive Oxygenate and Paraffin
Kim Bong-Seock ; Ogawa Hideyuki ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 5, 2006, Pages 552~561
The single droplet combustion characteristics of diesel fuel and low quality oil with additive oxygenate and paraffin under high ambient temperature and atmospheric pressure were investigated in the study. The results of the study may are concluded as follows: In the combustion of diesel fuel and low quality oil droplet with additive of oxygenate and paraffin. the dimensionless droplet size of
was linearly decreased with time. A fuel droplet with low boiling temperature additives and in high boiling temperature base fuel evaporates and burns faster than usual base fuel. Especially. these trends were remarkably obtained by decreasing boiling point and increasing blending contents of additives in case of oxygenated agents rather than n-paraffin agents. This rapid burning may result from so-called 'micro-explosion' and its burning intensity varies with the types of additives. The results above may suggest that rapid evaporation of oxygenate additive in the middle stage of combustion can contribute much to combustion improvement of blended fuels.
Structural Analysis and Topology Optimization of an Automotive Pedal Arm Considering Qualification Test Specifications
Lee Boo-Youn ; Lee Hyun-Woo ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 5, 2006, Pages 562~571
Finite element analysis is performed to evaluate structural reliability of an automotive pedal arm under conditions of the stiffness, the load and the endurance test specifications. Results of the analysis shows that the pedal arm is safe enough under the tests. A topology optimization is numerically implemented, overall shape of the pedal arm being verified to be reasonable, A design concept to insert holes in the arm is established, which may be used to reduce its weight.
A Study on the Heat Release Analysis to Compensate the Error due to Assumption of Single Zone in Diesel Engine
Ryu Seung-Hyup ; Kim Ki-Doo ; Yoon Wook-Hyeon ; Ha Ji-Soo ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 5, 2006, Pages 572~579
Accurate heat release analysis based on the cylinder pressure trace is important for evaluating combustion process of diesel engines. However, traditional single-zone heat release models (SZM) have significant limitations due mainly to their simplified assumptions of uniform charge and homogeneity while neglecting local temperature distribution inside cylinder during combustion process. In this study, a heat release analysis based on single-zone model has been evaluated by comparison with computational simulation result using Fire-code, which is based on multidimensional model (MDM). The limitations of the single-zone assumption have been estimated, To overcome these limitations, an improved model that includes the effects of spatial non-uniformity has been applied. From this improved single-zone heat release model (Improved-SZM), two effective values of specific heat ratios, denoted by
in this study, have been introduced. These values are formulated as the function of charge temperature changing rate and overall equivalence ratio. Also, it is applied that each equation of
has respectively different slopes according to several meaningful periods during combustion progress. The heat release analysis results based on improved single-zone model gives a good agreement with FIRE-code results over the whole range of operating conditions of target engine, Hyundai HiMSEN H21/32.
Application of Subgrid Turbulence Model to the Finite Difference Lattice Boltzmann Method
Kang Ho-Keun ; Ahn Soo-Whan ; Kim Jeong-Whan ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 5, 2006, Pages 580~588
Two-dimensional turbulent flows past a square cylinder and cavity noise are simulated by the finite difference lattice Boltzmann method with subgrid turbulence model. The method, based on the standard Smagorinsky subgrid model and a single-time relaxation lattice Boltzmann method, incorporates the advantages of FDLBM for handling arbitrary boundaries. The results are compared with those by the experiments carried out by Noda & Nakayama and Lyn et al. Numerical results agree with the experimental ones. Besides, 2D computation of the cavity noise generated by flow over a cavity at a Mach number of 0.1 and a Reynolds number based on cavity depth of 5000 is calculated. The computation result is well presented a understanding of the physical phenomenon of tonal noise occurred primarily by well-jet shear layer and vortex shedding and an aeroacoustic feedback loop.
Analysis of Flow Characteristics on the Axial Flow Fan with Centrifugal Blade
Choi Jung-Geun ; Lee Seok-Jong ; Lee Myoeng-Ho ; Sung Jae-Yong ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 5, 2006, Pages 589~596
This study aims to propose a new model axial flow fan which attachs centrifugal blades, and to investigate the effect of centrifugal blades on the performance improvement of new model axial flow fan. A numerical simulation has been conducted using STAR-CD commercial code to solve the three dimensional incompressible Navier-Stokes equation for high Reynolds number
turbulent model. Numerical simulation is carried out to investigate the detail phenomenon in the flow field and performance characteristics of new model and normal model fan. Calculation results are compared with normal model's results to investigate which centrifugal blades effect on velocity profile and pressure distribution at various flow field positions. and calculation results show that new model fan can improve the performance of total pressure.
Numerical Simulation of Solution Droplets and Falling Films in Horizontal Tube Absorbers
Phan Thanh-Tong ; Lee Ho-Saeng ; Yoon Jung-In ; Kim Eun-Pil ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 5, 2006, Pages 597~607
This paper presents a numerical simulation of the behavior of the LiBr solution droplets and falling films in horizontal tube banks of absorber. The model developed here accounts for the details of the droplets formation and impact process for absorption on horizontal tubes including the heat transfer from solution film to the tube wall. Especially. the characteristic of unsteady behavior of solution flow has been investigated. Flow visualization studies shown that the solution droplets and falling films have some of the complex characteristics. It is found that. with the numerical conditions similar to the operating condition of an actual absorption chiller/heater, the outlet solution temperature and heat flux from solution film to the tube wall have a stable periodic behavior with time. The solution droplets and falling films in horizontal tube banks of absorber is a periodic unsteady flow. The results from this model are compared with previous experimental observation taken with a high-speed digital video camera and shown good agreement.
An Environmental Engineering Approach to the Nirvana in Korea
Chang, Tae-Hyun ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 5, 2006, Pages 608~622
This study has performed to investigate the Buddhist remains in Korea Particularly, the Nirvana and Sarira Pagoda at Tongdo temple, Sangwoun temple, Jungam temple, Bubheung temple and Bongjongam are handled by using on the observation, references and interviews with some experts in Buddhist culture. The results in Korea are compared with that of Thailand and China. But, The Nirvana and the Sarira Pagoda to keep Buddha's relic are quite different at each temple in Korea, Thailand and China. The air velocities were calculated in side of the Nirvana by using STAR-CD.
Optimization of Pulsed Nd:YAG Laser Welding Conditions for Sealing of Lithium-ion Battery
Kim, Jong-Do ; Yoo, Seung-Jo ; Kim, Jang-Soo ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 5, 2006, Pages 623~628
Laser material processing is a very fast advancing technology for various industrial applications. because of many advantages. Its major advantage of less and controlled heat input has been exploited successfully for the very critical application of aluminium alloy welding. This study suggested the occurrence source of weld-defects and its solution methods in a welding of lithium ion battery by pulsed Nd:YAG laser. In experiment. battery case has changed over joint geometry from welding of side position to flat one. In the case of a electrolyte injection hole in order to seal it. welding is carried out after pressing Al ball. At this time. an eccentric degree. contact length and gap are worked as a major parameters. As improving the method of Al ball pressing. it was able to reduce an eccentricity. increase the contact length and decrease gap. As a results of a experiment. a sound weld bead shape and crack-free weld bead can be obtained.
The Weldability of Laminated Stator Core for Motor by Pulsed Nd:YAG Laser [ I ] - The Effect of Processing Parameter on Weldability of Laser -
Kim Jong-Do ; Yoo Seung-Jo ; Kim Jang-Soo ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 5, 2006, Pages 629~635
Manufacture of motor by laser has been studying realization that was demands on market for lightening and miniaturization. Moreover. early in the 1980s. manufacture of parts for automobiles by laser welding was already successfully introduced. The purpose of this study was to develop production technology of the high quality laminated stator core for motor by pulsed Nd:YAG laser heat source. In the event of adjusting defocus and voltage to control humping in laser welding of the laminated core. sound bead could be obtained. but deep penetration was not. Therefore. explosive evaporating plasma was controlled by adjustment of peak power on pulse width. Particularly, because explosive evaporating plasma induced high peak power, made molten metal in keyhole scatter. a suitable adjustment of peak power was required to obtain sound bead. As a results of experiment. sound bead and deep penetration could be obtained.
The Weldability of Laminated Stator Core for Motor by Pulsed Nd:YAG Laser [II] - Investigation of Mechanism on Formation of Weld Defect -
Kim Jong-Do ; Kil Byung-Lea ; Lee Chang-Je ;
Journal of the Korean Society of Marine Engineering, volume 30, issue 5, 2006, Pages 636~644
Recently, there were some successful examples that the laser welding was introduced into production line. However, the spread of laser welding is not sufficient in many industries. There are several reasons why it is difficult to penetrate the laser welding into production lines. Because it is different from reflection, absorption and permeation of laser beam according to material and surface condition. Moreover, there are significant problems in processing such as absorption and scattering of beam by the induced plasma or plume. Therefore, understanding of mechanism on formation of weld defect in laser welding of the laminated core for motor is very important. In this paper, it was analyzed in terms of materials which was source of defect in laser welding and conventional arc welding. As a results of analysis, insulation coating film of the laminated core was judged to main factor of weld defect. it could be well aware as tracing carbon volume, and it was deduced that weld defect by insulation coating film was caused by difference of mechanism between the two heat sources.