Application of ADRC in position servo system for billet flash butt welding

To improve the performance of the hydraulic position servo system of billet flash butt welding,which is a key technology for endless rolling system,the active disturbance rejection control (ADRC) technique was proposed in controller design and followed by verifying simulations. Considering the challenges, such as the difficulty in establishing precise mathematical modeling of nonlinear parts for the system,time-varying characteristics of the system parameters,and coupling and interference existing in the actuator,an AMESim platform was adopted to build models. Based on main influencing factors of the system, the third-order nonlinear discrete ADRC was designed to meet the requirements of high speed response,strong anti-interference ability and good stability for the position servo. Simulation of the position servo was carried out through the joint platform integrated AMESim and Matlab to test the validity of the proposed method. The simulated results show that the system had good anti-disturbance ability and better effect of position servo was achieved through the control strategy based on ADRC technique,which verified the feasibility and advantages of using ADRC technology in position servo system of billet flash butt welding.