Abstract

In this paper the impedance control concept is applied to a class of six-DOF parallel robots. A geometrically consistent six-DOF impedance behaviour is enforced at the end-effector to manage the interaction with the environment. The overall control scheme is based on an inner/outer strategy with an outer impedance control loop and an inner motion control loop of inverse dynamics type. An approximate dynamic model of the parallel structure is adopted for on-line computation of the compensation terms required by the inverse dynamics control law. Simulation results are presented to show the effectiveness of the proposed strategy.

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