Study On The Method Of Torsional Vibration And Active Control Of Printing Cylinder

Printing cylinder torsional vibration is one of the main forms of vibration presses, directly restricts the increase printing speed, reduce the quality of printed products, increasing the incidence of mechanical failure. As a core component of the press rolls, it is key to the printing cylinder torsional vibration studies. In this paper, the impression cylinder dynamics model, the control model and active control methods were studied and analyzed, and experimental platform for active control of the actual results were verified, to suppress the printing cylinder to provide a theoretical basis for torsional vibration. In this paper, torsional vibration and active control methods from the theoretical and experimental studies both printing cylinders, mainly to complete the following work:Printing press impression cylinder torsional vibration modeling, this paper analyzes the main reasons of the impression cylinder torsional vibration generated and easy to quantify the excitation force and the cam roller gap opening and closing gripper mechanism actuation force as experimental factors and other parameters used quality and distribution of centralized quality combination of methods, dynamics and mathematical models to establish the impression cylinder torsional vibration, natural frequencies and forced to solve torsional vibration modes, and with CAE simulation results to verify the accuracy of the calculation model. Concluded: changes with printing pressure and printing speed, the impact of the two torsional vibration excitation force will change; increase the mathematical model and the cam roller gap excitation force excitation force opening and closing gripper mechanism more in line with imprint Torsional vibration characteristics of the drum for torsional vibration active control provides a reliable model.Active control of the impression cylinder torsional vibration, this paper analyzes the torsional vibration active control method, that through active control of the motor input parameters can suppress torsional vibration. Control built using Simulink simulation model, the mathematical model into the torsional vibration control model to determine the control variables and control methods using PSO algorithm automatically find the optimal parameters of the motor input, comparative analysis of the effectiveness of the control method. It concluded that: according to the impression cylinder of the torsional vibration characteristics, by actively controlling the input parameters of the motor, can be effectively suppressed torsional vibration response; and proves automatic optimization features of PSO algorithm can be used to better solve torsional vibration of the drum problem.This article is also designed to build an experimental platform for motion control and torsional vibration control, motion control simulation under different conditions by the impression cylinder torsional vibration response; PLC programming using active control of the motor input parameters to control torsional vibration purpose. The results show that: the same conditions, the impression cylinder experimental platform in the active control, significantly reduced torsional vibration response proved by the method of active control motor input parameters, the maximum amplitude is reduced by approximately 12%, it is possible to effectively suppress the printing cylinder torsional vibration response.