Observer-based model-free controller for the perturbations estimation and attenuation in robotic plants.

The model-free controller is a powerful method because it does not require the knowledge of the robotic plant dynamic equation. Since most of the model-free controllers consider variants of the adaptive or reinforcement learning, one observer-based model-free controller could be a different alternative of interest in the researching community. In this study, an observer-based model-free controller is suggested for the perturbations estimation and attenuation in robotic plants, it contains the model-free observer and the model-free controller. The model-free observer based on the high gain method uses the bounds of the perturbations. The model-free controller based on the sliding mode method uses the bounds of the perturbations and gravity terms. The observer-based model-free controller is applied for the perturbations estimation and attenuation in a cylindrical robotic plant, and a scalar robotic plant. [Display omitted] • Observer-based model-free controller for perturbations estimation and attenuation in robotic plants. • Observer-based model-free controller contains model-free observer and model-free controller. • Model-free observer based on high gain uses perturbations bounds. • Model-free controller based on sliding mode uses perturbations and gravity terms bounds. • Observer-based model-free controller is applied in two robotic plants. [ABSTRACT FROM AUTHOR]