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Brake disk cooling performance optimization with DFSS
Sangyeol Choi(최상열),Semoon Choi(최세문),Younghoon Kim(김영훈),Yongsuk Kim(김용석) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The cooling performance of ventilated brake disk of vehicle which depends on convective heat transfer rate governed by air flow entering into brake system is the main property to determine the brake disk size. To achieve competitive brake disk size will contribute the mass reduction that is one of most significant challenges for fuel economy in recent automotive industry. To improve the cooling performance of brake disk without disk size increasing, it is obvious that the cooling air flow should be induced to brake system inside wheel rim effectively by design optimization of vehicle front end and underbody configurations. However, there are little correlation studies between vehicle geometry and brake cooling performance. So, it is necessary that it should be preceded to find the correlation with each geometric change. In the present study, DFSS method is used for analyzing which design parameter affect on brake cooling performance and how it works on. According to the results, brake cooling performance is proportional to mass flow rate into wheel and it should be controlled to achieve desired brake sizing and cooling performance.
차량 형상에 따른 브레이크 냉각성능과 공기역학적 성능과의 상관관계에 관한 수치해석적 사례연구
최상열(Sangyeol Choi),백봉범(Bongbum Baek),하종백(Jongpaek Ha) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The cooling performance of ventilated brake disk of vehicle depends on convective heat transfer rate governed by air flow entering to brake system. To improve the cooling performance, it is obvious that heat released area of objectives should be larger and cooling air flow should be induced to brake system effectively by design optimization of vehicle front end and underbody configurations. However, increasing the brake disk size which is related with heat release causes not only poor fuel economy by increment of vehicle weight and also development cost increases. In addition, it could be concerned about aerodynamic performances due to the geometric changes. Accordingly, it would be more competitive to precede and optimize the co-relation with each performance. Therefore, the aims of this case study with CFD are to support the effect of additional parts and design changes on the brake cooling performance and to provide the advanced backups for the further development.
차체와의 동적 거동을 고려한 파워트레인 마운트 브라켓 볼트의 최적 위치 선정에 관한 연구
박원준(Wonjun Park),최상열(Sangyeol Choi),김선명(Seonmyeong Kim),최진호(Jinho Choi) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The powertrain mount bracket should be designed to robustly support the dynamic load and vibration between powertrain and vehicle body. For the robust powertrain mount bracket design, one of the most important design factors is the proper bolt position since it affects the load distribution. This paper presents a study on optimal bolt position of powertrain mount bracket considering dynamic behavior between powertrain and vehicle body based on CAE analysis and bolt assessment GM in-house method.
김선명(Seonmyeong Kim),최상열(Sangyeol Choi),최진호(Jinho Choi),한승진(Seungjin Han) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Most of automotive companies have bent its energies to develop mass efficient lightweight vehicles as well as fuel efficient subsystems due to stringent CO2 regulation and high oil prices. Fuel tank strap is not an exception as one of the crucial subsystems in a vehicle, but it should be cautiously designed since it is one of the most important requirements for vehicle safety. It should be designed as much as light while meeting the durability requirement. This paper deals with a design optimization of fuel tank strap for mass reduction considering durability performance based on the nonlinear structural analysis of fuel tank strap under maximum load of each direction to evaluate the durability. Through the durability assessment and DOE study, it is found that thickness and width of fuel tank strap affect durability significantly. Base on the study, a fuel tank strap is optimized for a base model using DFSS method and topography optimization technique for mass reduction to meet durability.
차량의 공력 성능 향상을 위한 Separation Fin 적용
이동현(Donghyun Lee),최상열(Sangyeol Choi),김용석(Yongsuk Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
On vehicle Aerodynamic performance development, main interest is exterior design. After exterior design fixed, Aerodynamic performance improvement is difficult due to design constraint. Especially on Hatch Back type vehicle, due to vortex air flow on rear area, Aerodynamic performance improvement is harder than Notch Back type vehicle without surface design change. But in many cases, vehicle performance improvement required after design fixed. To improve Aerodynamic performance without exterior surface change, most effective way is attach additional Aerodynamic parts on vehicle. In this study, improvement of drag and lift performance accomplished by CFD analysis and wind tunnel test through additional parts.