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RISS 인기검색어
- 검색키워드
- 저자 : 안병의(Byungeui Ahn) (검색결과 4 건)
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Cowl Plenum Box내에서 물의 거동을 예측을 위한 해석 방법 개발 및 적용
김연수(Yeonsoo Kim),안병의(Byungeui Ahn) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This study is to predict water behavior in cowl plenum box with two different boundary conditions, a car-washing condition and a shower condition. The simulation method correlated with three test results could be used for developing the new vehicles. There are various key factors having effects on water ingress into HVAC like these: the input amount of water, the car attitude information (the inclined angle against the ground), the volume size of cowl plenum box and Blower On/Off in HVAC. These key factors are reflected in this study. Through this study, we will be able to reduce the numbers of trial and error for design change of main parts, and propose optimal design from the view of aerodynamics and water behavior. Also, as reducing the numbers of the vehicle-developing test, we will be able to cut down on considerable cost at vehicle-development budget.
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이상욱(Sang Wook LEE),안병의(Byungeui Ahn) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Development of vehicle underbody fairings to reduce aerodynamic drag is performed by using current state-of-theart CFD technique and validated by wind tunnel test. Commercial CFD software based on the Lattice Boltzmann Method and S2A wind tunnel located in St-Cyr, France were used for the CFD simulation and wind tunnel test, respectively. C-segment sedan was selected for the drag minimization. Based on the aerodynamic analysis, 3 different underbody fairings were decided such as an engine undercover, a rear axle fairing, and a canister faring whose CdA (Drag coefficient multiplied by frontal area) effect expected by simulation were 0.012m², 0.011m², and 0.006m² respectively. Full scale wind tunnel tests were conducted to validate the aerodynamic effect of these parts and measured CdA effects are exactly same as those of simulation. It is concluded that underbody fairing can successfully reduce aerodynamic drag without any demerit of customer value.
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오장현(Janghyun OH),이상욱(Sangwook LEE),안병의(Byungeui AHN) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In this study, the effect of surrounding parts on the retention force of open hood which is only maintained by safety hook at high speed driving was analyzed. Compared objects were mini MPV, mid-size coupe and submid-size hatchback, which have different hood shapes, respectively. Aerodynamic analysis was performed by PowerFLOW which is commercial software based on Lattice Boltzmann method. And structural analysis was performed by NASTRAN. Related to the effect of each part, the mass flow rate and pressure were investigated since the force is caused by the pressure difference between hood outer and inner panel. At first, the effect of the adoption, size variation, hole creation of under-cover were studied. Secondly, it was observed that there was the meaningful effect of the closing of bumper lower air intake by changing the mass flow, which imitates air shutter. Related to the heat exchanger, there was little effect of pressure drop for the range in this study. Finally, it was observed that the changing of engine size effects greatly on hood retention force.
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이상욱(Sang Wook LEE),박종훈(Jong Hoon PARK),지은식(Eun Sik JI),안병의(Byungeui AHN) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Influence of engine undercover to vehicle aero/thermal performance was investigated by using a current state-of-theart CFD technique based on LBM (Lattice Boltzmann Method) and aerodynamic/climate wind tunnel tests. For the performance evaluation, three driving conditions were considered such as high speed (165 km/h, 20°C), mid speed (60km/h, 35°C, cooling fan on), and idle state (0km/h, 45°C, cooling fan on) for a C-segment passenger vehicle on mass production. CdA effect of the engine undercover estimated by the CFD simulation is 0.012m², which is quite same as the value from the aerodynamic wind tunnel test (0.011m²). For both high speed and mid speed with fan on condition, effect of engine undercover to engine cooling (radiator heat dissipation) and HVAC performance is almost negligible. However, at idle state, engine undercover has a negative effect on HVAC performance due to the increase of engine room temperature.
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