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다물체 동역학 해석을 위한 마찰 접촉 모델링에 대한 연구
노현영(Hyun Young Roh),김범석(Bum Suk Kim),유홍희(Hong Hee Yoo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
This paper presents the method to remove the slip problem of the friction contact modeling employed in most of multibody dynamic analysis programs. Even if contact occurs between two rigid bodies with no slip condition, most of contact algorithms developed so far provide the results of low speed slip motion. The friction coefficient is defined as a spline function of relative velocities in most commercial codes. Such a function resolved the problem of the discontinuity in friction force. However, when the relative velocity approaches zero, friction coefficient approaches zero too. So, slip occurs when small force is applied. This problem of low speed slip is resolved in this study with a new modeling method.
노현영(Roh, Hyun-Young),유홍희(Yoo, Hong-Hee) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.6
This paper presents a friction model to realize self-excited vibration of multi-body systems. The friction coefficient is modeled with a spline function in most commercial codes. Even if such a function resolves the problem of discontinuity in friction force, it cannot realize self-excited vibration phenomena. Furthermore, as the relative velocity approaches zero, the friction coefficient approaches zero with the conventional model. So, slip occurs when small force is applied to the system. To avoid these problems a new friction model is proposed in this study. With the new friction model, the self-excited vibration can be realized since the friction coefficient changes with the relative velocity. Furthermore, the slip phenomena could be reduced significantly with the proposed model.