Abstract: In order to study the dynamic behavior of locomotive under saturated adhesion, the stability and characteristics of stick-slip vibration are analyzed with concept of average and dynamic slip rates. The stick-slip vibration is a dynamic process between stick and slip state, and its stability depends on the W/R adhesive damp, the reducing of average and slip rates is conducive to the stick-slip vibration stability. The lengthwise oscillation frequency of wheel set is several times the nature frequency of rotary vibration of wheel set, and the rotary vibration of wheel set and the lengthwise vibration of wheel set are coupled through lengthwise tangential force when the wheel set repeat in the state of adhesion and sliding alternately. The train dynamic model integrated with electromechanical and control system is established to simulate the phenomenon of stick-slip vibration on low adhesion and to verify the theoretical analysis. The results show that the increase of primary lengthwise stiffness and motor suspension stiffness are beneficial for stability and locomotive adhesion, and rational match of longitudinal locating stiffness of wheel set and motor suspension stiffness can avoid structural resonance under stick-slip vibration.

Key words: Adhesion, Driving dynamics, Locomotive, Parameters matching, Stick-slip vibration