Vibrational Characteristics of Coupling Model in Rectangular Wave Response Region

This paper describes an investigation of the behavior of a coupling model under gross sliding motion at the interface. The coupling model consists of two parts. One is an elastic part that is used to determine the dynamics of contact surface in machine tool structure. When the model is subjected to a large external harmonic torque, gross sliding motion takes place at the interface. The motion of the model is theoretically analyzed and analytic results is verified by experiments. It is concluded that the stick time at which two parts of the coupling model are sticked together at the interface decreases provided that the exciting frequency subjected to the coupling model is high, the maximum static friction torque at the interface is small and the transmitted friction torque is large. The maximum amplitude of damped vibration wave response of the coupling model is expressed by the frequency ratio, the ratio of maximum static friction torque to transmitted friction torque and the equivalent viscous damping ratio.