Velocity-measuring feedback control based on PMAC for hydraulic position servo system

Due to high nonlinearity and parameters´ indeterminacy, it is hard to improve dynamic response performance for the hydraulic servo system. On the basis of fractional calculus, a kind of fractional order control method is proposed in this paper. It takes third-order hydraulic position servo system based on PMAC(Programmable Multi-Axes Controller) as an example, using traditional integer order proportional differential (IOPD) controller and fractional order proportional differential (FOPD) controller to adjust the system respectively. From the simulation and experimental results presented, the designed FOPD controller works efficiently, with improved performance of faster response speed, higher steady precision and stronger anti-jamming capability compared with the traditional IOPD controller.