A Novel RISE-Based Adaptive Feedforward Controller for Redundantly Actuated Parallel Manipulators

Moussab Bennehar (1) , Ahmed Chemori (1) , François Pierrot (1)

1 DEXTER - Robotique médicale et mécanismes parallèles

A novel adaptive controller based on the Robust Integral of the Sign of the Error (RISE) is proposed. The RISE feedback strategy yields semi-global asymptotic tracking despite the presence of unstructured additive disturbances provided some limited assumptions on the system. To achieve better tracking performance, the RISE controller is extended with a model-based adaptive feedforward term. The addition of the feedforward term compensates for the structured uncertainties yielding reduced tracking errors and reduced control effort. The proposed controller is experimentally implemented on a 3-DOFs redundantly actuated parallel manipulator. The computed con- trol inputs are projected using a kinematics based projector in order to remove the internal efforts that may damage the mechanical structure of the manipulator. Experimental results show a better performance of the proposed adaptive controller compared to the basic RISE controller in terms of tracking accuracy and energy consumption.

Mots clés: Parallel Robots; Motion Control; Motion Planning for Manipulators

Domaines: Automatique; Automatique / Robotique

Moussab Bennehar, Ahmed Chemori, François Pierrot. A Novel RISE-Based Adaptive Feedforward Controller for Redundantly Actuated Parallel Manipulators. IROS: Intelligent RObots and Systems, Sep 2014, Chicago, IL, United States. pp.2389-2394, ⟨10.1109/IROS.2014.6942886⟩. ⟨hal-01070860⟩