Abstract:In order to improve the accuracy of tracking the desired position of the translational parallel robot, a research on the integrated electrohydraulic servo driven translational parallel robot position control was presented based on cross coupling control. The structure and controlling means of the 3-DOF integrated electrohydraulic servo driven translational parallel robot were analyzed. Based on the end actuator of the robot, the position and angle coordinate system was defined, and the inverse and forward kinematics solutions of the parallel robot were calculated in this coordinate system. Through the extension length of the hydraulic shaft, the speed and acceleration of the hydraulic shaft were calculated, then the dynamic model of the integrated electrohydraulic servo driver was obtained. Based on the position error of the integrated electrohydraulic servo driver, the synchronization error of the integrated electrohydraulic servo driver under three degrees of freedom was obtained. Using the synchronization error, the cross coupling error model was constructed, then the generalized error model was obtained, and the cross coupling controller was established to control the position of the robot. The experimental results show that compared with particle swarm optimization method, the tracking accuracy of the proposed method is improved by 40% and 42.15% respectively when tracking sinusoidal and irregular expected positions. The proposed method can be used to accurately control the position of the translational parallel robot with integrated electrohydraulic servo drive.