A position-based Explicit force control Strategy based on Online trajectory Prediction

In the mirror milling process of large thin-walled parts, maintaining a constant supporting force is crucial for improving the workpiece local stiffness to suppress vibration. Aiming at the flexible characteristics of large thin-walled parts, this work presents a position-based force explicit control strategy based on online trajectory prediction. An online trajectory pre-modification force controller is proposed, it contains a position pre-modification module and a typical feedback controller for coarse adjustment and precise adjustment. The position pre-modification value is obtained by online trajectory prediction, and the prediction method relies on an online force and normal direction measurement system. The position premodification module can reduce the interference of the flexible characteristics on the force control. Numerical simulation and experiment are carried out, the control results show: the performance of dynamic force tracking method proposed is improved compared with the traditional position-based explicit control strategy with a typical feedback controller.