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심해 퇴적물 저층충격시험에 따른 DSSRS 주변의 유동특성
채용배,임성진,허진석,이상호 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.2
Seawater flow characteristics around deep-sea sediment resuspension system was analyzed using CFD simulation. Seawater flow is influenced by migration velocity of DSSRS and the resuspension system with disturbance device. Especially complicated flow field is generated with discharged flow in the vertical direction, and there is large variation of seawater velocity near the system with vortex flow. Turbulent kinetic energy near the system increases 2~6 times, and its variation is also affected by the operation condition of the disturbance device. The results of this study are expected to be useful in evaluating the environmental effects of the suspended solid matters which are generated in the deep sea sediment disturbance process.
채용배,임성진,허진석,이상호 한국기계기술학회 2015 한국기계기술학회 학술대회논문집 Vol.2015 No.03
In this study, center marking process is numerically analyzed to investigate the characteristics of deformation of aluminium alloy bracket by the pin load. The proper size of groove which are required for marking system and the pressure of cylinder are predicted through the analyse of stress and strain fields of the plate. The results of this study show that von Mises stress is a maximum when the maximum of reaction force.
수치해석을 이용한 해저 망간단괴 집광기의 이동방향에 따른 유동장 특성 분석
채용배 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.5
Numerical analysis has been carried out to investigate seawater flow field characteristics with various current directions near the manganese nodule mining device. Seawater flow near the collecting device is largely influenced by the sea current direction, especially along the downstream of the rear system. Predicted flow velocity distributions are analyzed with turbulent kinetic energy and drag force. There is big flow field variation when the direction angle between the mining device and seawater current flow approaches to 30°~ 120°, and flow velocity along the rear region of 60° becomes faster than 180°. Averaged turbulent kinetic energy at 180° also becomes low, about 57% higher at 60°. These results from the study can be applicable to the optimum design of manganese nodule collecting system in the deep seawater flow.
채용배(YongBae Chae),허진석(JinSeok Heo),임성진(SungJin Lim),이상호(SangHo Lee) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
Seawater flow characteristics around deep-sea sediment resuspension system was investigated through CFD simulation in constant flow field. Seawater flow field is largely affected by the resuspension system with disturbance device. Especially, turbulent kinetic energy gradually decreases along the flow direction. It is also predicted that discharged flow in vertical direction affects rather larger and its effect reaches far downstream. The results of this study are expected to be useful in evaluating the effect of the suspended solid matter which is generated in the deep sea sediment disturbance process.
전산해석을 이용한 레이저다이오드 용접과정에서의 온도변화 분석
임성진,허진석,채용배,이상호 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.3
The characteristics of temperature variation for laser diode welding system have been analyzed with numerical investigation. The laser diode is assembled with a cap and stem by projection welding. Resistance heat, in this process, is generated by electric current at the contact surface between cap and stem within a very short time. Temperature variation of laser diode is largely affected by the welding time and the heat generated from the surface. Maximum temperature of each component in the laser diode should be lower than the melting point except for cap and stem in order to prevent welding defect. Temperature distribution of each component in the laser diode is also affected by thermal conduction mechanism. Welding defect near the insulator occurs when the resistance heat is high. Appropriate resistance heat supply to the laser diode was about 400W. The results from this study could be applicable for optimal design of laser diode welding system.
가속장치를 이용한 수직 축 풍력터빈 주위 공기 유동 수치해석
허진석,임성진,채용배,이상호 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.3
CFD(Computational Fluid Dynamics) analysis was carried out to analysis the air flow characteristics of vertical axis wind turbine system with accelerating device. Geometric arc angle of the accelerating device affects the air flow characteristics in the turbine with the effect of Coanda generated from the curved surface. Air velocity distributions with the device angle variation are compared. Flow velocity increases with the device length, and the accelerating device plays a key role in decreasing the air velocity in the wake flow region. Maximum air velocity variation becomes reduced with the accelerating device, and it is largely affected by the arc angle. These results are expected to be utilized in various ways to determine the shape of accelerating device for wind power generation system.
석판재 재단장치 내 시즈히터 작동에 따른 온도변화 분석
임성진,채용배,허진석,이상호 한국기계기술학회 2015 한국기계기술학회 학술대회논문집 Vol.2015 No.03
In this study, temperature variation characteristics in the stone board cutting device with sheath heater were analyzed through numerical investigation. Four 2kW sheath heaters whose length and diameter are 1800mm, 11mm are installed, and the initial temperature is -5℃. Also Transient condition is used for temperature variations with the operating time of sheath heater. From the analysis, transient temperature variations of cutting device after operating the sheath heater were predicted. Temperature variations were predicted that mainly appears in part contacted with the sheath heater. The result will be helpful in optimal design for various system equipped with sheath heater.