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2자유도 모델을 이용한 디스크 브레이크의 면외 운동에 미치는 접촉강성의 영향 분석
신기홍(Kihong Shin),조용구(Yonggoo Joe),차병규(Byeonggyu Cha),오재응(Jeaeeung Oh) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.2
A two degree-of-freedom mathematical model is presented to investigate the friction mechanism of a disc brake system. A contact parameter is introduced to describe the coupling between the in-plane and the out-of-plane motions. The model with the contact parameter is considered under the assumption that the out-of-plane motion depends on the friction force along the in-plane motion. In order to describe the relationship between the friction force and the out-of plane motion, the dynamic friction coefficient is considered as a function of both relative velocity and normal force. Using this friction law, a contact stiffness matrix along the normal direction can be obtained. The out-of-plane motion is then investigated by both the stability analysis and the numerical analysis for various parametric conditions. The results show that the stiffness parameters of the pad and the disc must be controlled at the same time. Also, the numerical analysis shows the existence of limit cycle caused by the effect of intermittent contact stiffness.