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채종영(Jongyoung Chae),김명구(Myoung-Gu Kim),조종두(Chongdu Cho),유일용(Ilyoung Yu),이승수(Seungsu Lee),이용산(Yongsan Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
For the existence of a electron-optical sensor in the smart munition, it is important to safe both soft recovery system projectile and the structure as well. In this paper, a design theory was provided by using advance computational fluid dynamics techniques. For saving time, an Axi-symmetric model was analyzed by the finite element method. Transient analysis for measuring stress, in accordance with the time-dependent pressure, was used to determine the dynamics response of the structure. Based on the established the solutions, the data obtained through performing the basic experiment was compared with the analyzed solutions after designing the soft recovery system.
캘리퍼 일체형 전자식 주차 브레이크의 방사소음 해석을 통한 작동소음 저감에 관한 연구
이정환(Junghwan Lee),김승중(Seungjoong Kim),채종영(Jongyoung Chae),박규식(Kyushik Park),한민규(Mingyu Han) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The purpose of this study is to minimize operating noise of Motor-on-Caliper (MoC) type Electronic Parking Brake (EPB) system. The acoustic radiation analysis model is developed based on the finite element method. This model is applied to derive an internal force from surface vibration by using an inverse load identification method and to predict the radiation noise by using a boundary element method. According to the experiments, gear meshing frequency for reduction gear is a main source of radiated noise. But, it is very difficult to find a reduction gear combination which can meets a low noise radiation and mechanical performance at the same time. Therefore, we focused on the exterior design to cut operating noise down by CAE technology. To verify the results from acoustic radiation analysis, an experiment was conducted under the same condition as numerical simulation, and their results were compared.
컬럼 장착형 전자식 조향 장치의 모터 열-유동 특성에 관한 연구
김승중(SeungJoong Kim),이정환(Junghwan Lee),김일용(Ilyong Kim),채종영(Jongyoung Chae),박규식(Kyushik Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this paper, flow and heat transfer characteristics of an brushless DC motor which is installed CMDPS(Column type Motor Driven Power Steering) are numerically analyzed three/two dimensional electromagnetic model and three-dimensional turbulence modeling. CMDPS is based on conventional steering system and it assist steering torque by motor, worm & worm wheel gear set. CDMPS motor is be heated by coil, stator core, magnet and rotor core because it is always operation and set on various situation in driving time. For the present study, parking situation is considered for boundary conditions (row RPM, high torque and natural convection at motor outside) because it is most severe heat conditions for motor. Heat loss of each parts is calculated by Maxwell and temperature characteristics are calculated Ansys and Star-CCM+.
해석기법을 이용한 매입형 영구자석 동기 모터의 특성평가에 관한 연구
이정환(Junghwan Lee),김승중(Seungjoong Kim),김일용(Ilyong Kim),채종영(Jongyoung Chae),박규식(Kyushik Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
As enforced the regulation of fuel efficiency and increased the demand of green car, many interest are focused on electric vehicle and hybrid electric vehicle. Therefore, it is well known that the Interior Permanent Magnet Synchronous Motor (IPMSM) plays an important role in electric direct-drive in-wheel traction system. This study describes the simulation method to predict the mechanical characteristics which is coupled with an electro-magnetic field of IPMSM. The simulation was performed in two steps based on the finite element analysis. In the first step, electro-magnetic forces and losses versus rotation angle of rotor were calculated using 2D electro-magnetic field analysis with the current inputs given from experiments. In the second step, the resultant forces and losses were applied to the rotor and stator in order to calculate mechanical characteristics (stress, temperature distribution, etc) at the operational condition of interest using transient analysis. To verify the results from analysis, an experiment was conducted under the same condition as numerical simulation, and their results were compared.