Abstract

This paper is devoted to the impedance control problem of a double-acting hydraulic piston actuator. Thereby, it is the task of the impedance control system to produce a response to an external force which corresponds to the response of a predefined mechanical system, with a desired (nonlinear) stiffness and a desired (nonlinear) damping characteristics around a desired operating point of the piston position. The controller design is based on a port-Hamiltonian representation of the mathematical model utilizing the fundamental thermodynamic relations of an isentropic fluid.

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