Abstract
Abstract In this paper, a trajectory tracking control strategy is proposed for a double-joint manipulator system driven by pneumatic artificial muscles. A nonlinear extended state observer is designed to estimate both disturbances and states of the double-joint manipulator system. Furthermore, a state error feedback controller is introduced to obtain good trajectory tracking control performances of the double-joint manipulator system. In addition, both effectiveness of the nonlinear extended state observer and stabilizability of the double-joint manipulator system are demonstrated. Finally, trajectory tracking experiment results show that the proposed strategy in this paper is effective to achieve control requirements with low frequency, high frequency, loads and disturbances.
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