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A force servo based impedance controller that allows compliant behaviours of the leg of a hydraulic legged robot has been presented in this paper. A novel velocity compensation algorithm which makes for elimination of the redundant forces is also included. Their performance is assessed on a 2-DOF hydraulic leg whose kinematics and transfer functions have been modeled. A double hydraulic cylinders experiment platform is designed for performance testing of the force tracking of the hydraulic actuators. Experimental results have shown a good performance of the impedance controller which allows arbitrary virtual stiffness and damping of the leg.
Fu et al. (Tue,) studied this question.
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