Application of ADRC technology in electrohydraulic force servo system

To meet the performance requirements of electrohydraulic force servo system for the upset process of billet flash butt welding of the ending welding rolling, composite control strategy based on active disturbance rejection control (ADRC) technology and force synchronization errors feedback correction strategy were presented. Considering the nonlinear of the system, time-varying parameters and coupling arising from mechanical structure, the system model was built in AMESim. The system has the challenges entailed by the conditions such as the upset force to be loaded with big force value, the variable rigidity of the loading system, the synchrony requirement while the two cylinders loading with even load on each cylinder. The interference of hydraulic servo system should be eliminated. Aiming at to furnish a robust, quick response, and synchronous loading system, composite control strategy based on ADRC technology and proportional integral synchronization errors feedback correction was proposed. The effectiveness and feasibility of the composite control strategy are verified through simulation research of a quick and big load servo with impulse.