Differential Flatness and Flatness Inspired Control of Aerial Manipulators based on Lagrangian Reduction

2021/11/02 by Skylar X. Wei, Wei, Skylar X., Peder Harderup +3
Engineering · Computer Science · #Control and Dynamics of Mobile Robots #Robotic Path Planning Algorithms #Robotic Locomotion and Control

paper · pdf · doi:10.48550/arxiv.2111.01302

Abstract

This paper shows that the dynamics of a general class of aerial manipulators, consist of an underactuated multi-rotor base with an arbitrary k-linked articulated manipulator, are differentially flat. Methods of Lagrangian Reduction under broken symmetries produce reduced equations of motion whose key variables: center-of-mass linear momentum, vehicle yaw angle, and manipulator relative joint angles become the flat outputs. Utilizing flatness theory and a second-order dynamic extension of the thrust input, we transform the mechanics of aerial manipulators to their equivalent trivial form with a valid relative degree. Using this flatness transformation, a quadratic programming-based controller is proposed within a Control Lyapunov Function (CLF-QP) framework, and its performance is verified in simulation.

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