Practical Complete Tracking With Pivoted Unidirectional Actuation

Abstract

This paper addresses practical tracking control for robotic vehicles with pivoted unidirectional actuators. A widely recognized obstacle to tracking control for multirotors is the free-fall singularity --- when commanded to free-fall, the vehicle's attitude target becomes undefined. This singularity is a pathology pertinent to all robotic vehicles with pivoted and gimbaled unidirectional actuators. This paper addresses the planar instance of the general theoretical problem: the case of a vehicle with pivoted unidirectional actuation. Starting from a baseline robust controller that assumes unconstrained inputs, we redesign the control law to be compatible with the pivoted actuator. This is accomplished by driving the output of the pivoted actuator to a ball centered at the target input value. The baseline controller's guarantees are recovered in a practical sense. The theory is illustrated with a simulation example.

This work has been submitted to the IEEE for possible publication. Copyright may be transferred without notice, after which this version may no longer be accessible. (8 pages, 5 figures, submitted to 65th IEEE Conference on Decision and Control)