Register System Design Of Shaftless Gravure Press Based On Active Disturbance Rejection Algorithm

Nowadays shaftless drive technology is widely used in gravureregister printing systems, compared with the traditional mechanical shaft system,Shaftless system is a sort of complex nonlinearity system whichneeds multi-axis synchronization control. The system’s structure is quitedifferent from traditional mechanical shaft gravure and the register error is derived frommore complex factors. For such a system, traditional control methods are not so effective,so doing some research on shaftless register system and designing new control methodsfor it are of important practical significance.First, register operation principle and the features of shaftless gravure are clarified inthis thesis. Second, the system’s overall design scheme, hardware structure andcommunication architecture are introduced and the design of application layer incommunication is completed. Moreover, existing main control technologies are analyzed,detection and calculation of register error, register unit’s control model and multi-axissynchronization control strategy are also briefly outlined. Third, research on themathematic model of register error and control algorithm is conducted. Traditionalalgorithm of PD with feedforward is improved by introducing active disturbance rejectionpart based on extended state observer, which is capable of estimating the disturbance. Inthe way, a new active disturbance rejection control strategy is proposed, which turns thecomplex nonlinearity system with strong coupling, large disturbanceand model uncertainty into an approximate second-order linear system. This methodreduces the control difficulty, improves the system’s anti-jamming ability. What’s more,through this method, accurate decoupling can be achieved even with model uncertainty,which shows good applicability of the method. Fourth, parameter tuning method ofproposed active disturbance rejection algorithmis introduced. Compared to traditional active-disturbance-rejection algorithm, proposed algorithm has less parameter to be adjusted and has strong operability. Finally, simulation of proposed method is conducted in Matlab. The waveforms of traditional algorithm and active-disturbance-rejection algorithm are compared. Simulation results show that proposed active-disturbance-rejection algorithm accelerates register error’sconvergence rate, enhances the system’s anti-jamming ability and improves the controller’sadaptive capacity.