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테니스 라켓의 안정타점영역의 확장을 위한 CAD화에 관한 연구
오재응,박호,홍하윤,염성하,Oh, Jae-Eung,Park, Ho,Hong, Ha-Yoon,Yum, Sung-Ha 대한기계학회 1988 대한기계학회논문집 Vol.12 No.1
본 연구에서는 실험적인 모우드해석법을 실제의 테니스 라켓에 적용하여 모우드파라미터를 구한 다음, 그 파라미터의 변화에 따르는 안정타점영역의 변화를 컴퓨터 시뮬레이션을 통해서 에측하였다. 또한 안정타점영역을 확장시키고 라켓의 동특성을 개선시킬 수 있는 모우드파라미터를 찾아서 라켓의 설계제작단계에 정보를 제공하는 테니스 라켓의 CAD(Computer Aided Design) 화를 위한 자료 획득을 목적으로 한다. The dynamic characteristics of a tennis racket were identified by experimental modal analysis and the sweet spot due to these was calculated. A tennis racket was selected as a model reference and modal parameters of the racket were estimated from the transfer function measured by experiment. The transfer function was reconstructed by the modified modal parameters on the assumption that the racket was locally modified, for example, a change in the material of the frame and the attachment of a damping material to the grip. The change of the dynamic characteristics, especially natural frequency and magnitude of the second and the third vibrational modes, were evaluated from the reconstructed transfer function. The change of the sweet spot due to the modified modal parameters was estimated and visualized through computer graphic simulation by the criterion of the sweet spot measured before structural modification. The modal parameters for improvement of the dynamic characteristics.
[차량운동성능] 최적설계를 이용한 준 동적 DIVE 모델의 DIVE 개선
우덕진(Tokchin Woo),홍하윤(Hayoon Hong),오정배(Jungbae Oh) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
QDM(Quasi-Dynamic Dive Model) for mathematical model of front & rear suspension of a light duty truck is developed to predict dive behavior. Firstly, it is shown that the QDM is valid with measurement. To improve dive behavior of the light duty truck, the QDM model is linked with optimization program. The optimum front suspension geometry for minimum dive motion is obtained. The proto light duty truck with optimum front suspension geometry showed nose dive by 30% reduction.