Study on Non-linear Twist Vibration of Main Transmission System of Vertical Rolling Mill

According to the actual parameters of the main transmission of vertical rolling mill, four degrees of freedom non-linear dynamical model on vertical rolling mill had been established. The main consideration in this text is the dynamic characteristics of nonlinear damping. A physical model was built, and mathematical equation was written, the parameters computation was carried on by Matlab software, the phase diagram and Poincare sections graph can be obtained. So the vibration appearance in the different kinds of driving force frequencies and the theoretical basis for the normal movement vertical rolling mill are obtained.