Bifurcation characteristics and control of friction self-excited vibration system of coke pushing

There are typical friction self-excited vibration phenomena such as stick-slip and flutter in the working process of a coke pushing device.For the purpose of studying the vibration mechanism, a mechanical model of friction self-excited vibration of a double-mass-conveyor belt is established based on the Stribeck friction effect.Mass 1 and mass 2 are used to represent the part entering the carbonization room and the part outside the carbonization room, and the stability and bifurcation characteristics of the two masses are studied.The results show that the critical instability velocity and bifurcation velocity of the two masses are the same.Then the linear and nonlinear state feedback controller is designed to control the velocity bifurcation points and limit cycles of the coke pushing system.The numerical simulation results show that the appropriate selection of linear gain can reduce the bifurcation velocity and ensure the stability of the system at low velocity, and the appropriate selection of nonlinear gain can reduce the amplitude of the limit cycle and reduce the intensity of self-excited vibration of the coke pushing device.