Mechanism Analysis and Behavior Characterization of Stick-Slip Vibration

Abstract

In order to clarify stick-slip vibration mechanisms and characterize stick-slip vibration behaviors, a three-dimensional numerical model of the slider-plate friction contact was established using the finite element method, and the mechanism characteristics of slip vibration and stick-slip vibration were analyzed in terms of contact stick-slip and vibration responses. Meanwhile, the stick-slip vibration behaviors of the system under the influence of different parameters were investigated. The results show that depending on the vibration form of the system, the distribution and amplitude of contact stresses in adhesion and slip states differ. The frequency domain curve of the friction force for the slip vibration mainly includes three characteristic frequency ranges, namely, 0~75 Hz, 80~150 Hz and 1300~1600 Hz, while the characteristic frequency component of the friction force for the stick-slip vibration mainly exhibits 0~65 Hz. Therefore, the high-frequency component of the friction force may originate from the continuous slip vibration. The presence and monotonically increasing (or constant) of the relative velocity at the contact interface drives the formation of the slip vibration, while the presence of non-monotonically varying relative velocity drives the formation of the stick-slip vibration. Appropriate reductions in spring stiffness and plate motion velocity and increases in the damper damping will slow down the degree of stick-slip vibration, thereby reducing the effect of stick-slip vibration on the system behavior. In addition, compared to the constant value friction characteristic of the contact interface, the exponential decay friction characteristic has a smaller effect on the degree of stick-slip vibration of the system.