Abstract: A new dynamic model of the cam-follower system at high speed is developed, in which both the longitudinal oscillation and transverse vibration of the push-rod are considered.The equations of motion of the push-rod and the critical frequency determinant are derived to determine the transition curves seperating stability from instability. The experiment has been carried out to justify the validity of theoretical analysis.

Key words: 不稳定现象, 动力模型, 动力稳定性, 临界频率, 凸轮系统