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Abstract

In this paper, a nonlinear output feedback output tracking control scheme based on prescribed performance is proposed for the tracking of mold vibration displacement driven by a servo motor. Firstly, asymptotic trajectories of internal states are conducted using the output and its derivatives, which obtained by the designed high-order sliding mode differentiators. Secondly, a performance function and an output error transformation are introduced to establish an equivalent system model which simplified the controller design. Thirdly, based on the Lyapunov stability theory, a backstepping controller is designed to guarantee the transient and steady state performance of the system. Simulation results show that the proposed scheme is effective.