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자료유형
학술대회자료
저자정보
김창선 (서울과학기술대학교) 이승현 (서울과학기술대학교) 김철호 (서울과학기술대학교)
저널정보
한국자동차공학회 한국자동차공학회 춘계학술대회 2014 KSAE 부문 종합학술대회
발행연도
2014.5
수록면
991 - 1,000 (10page)

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초록· 키워드

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The objectives of vehicle aerodynamic design is on the fuel economy, reduction of the harmful emissions and minimizing vibration and noise and the driving stability of the vehicle. Especially in case of a sedan, aerodynamic driving stability of a vehicle is the main focus, and for this, the proper evaluation of aerodynamic driving stability of a vehicle is required. In this study, we yield the size of moving moment on the body of the vehicle generated by side wind when sedan type vehicle drives on the road and complete a numerical algorithm to evaluate aerodynamic driving stability of a vehicle judging whether such moving moment has a serious impact on vehicle driving stability. The model vehicle for the study is sedan type vehicle shape recommended by SAE. In the study, we yield the pressure drag and the position of C.P. on the body of the vehicle generated when the vehicle drives with side wind using CFD technique. Based on this, we also calculated pitching, rolling and yawing moment of the body of the vehicle generated on the center of gravity, and the result from comparing turning moment values and the size of rotational resistance moment of the body of the vehicle can be used as the basis to judge driving stability such as off-course and rollover of the vehicle. After driving stability of a vehicle when the vehicle drives 100km/h with 15m/s side wind is evaluated using the numerical algorithm drawn from the study, the value of yawing moment is 606N.m, rolling moment -773N.m and pitching moment 84N.m. These values are smaller than each value of rotational resistance moment the model vehicle has, and therefore, the model vehicle’s driving stability is guaranteed when driving 100km/h with 15m/s side wind.

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Abstract
1. 서론
2. 차량의 공기역학적 특성
3. 외기에 의한 모멘트 산출 이론
4. 동적 안전성 판단이론
5. Case Study
6. 결론
References

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