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arXiv · 2306.16626

Cascaded Model Predictive Control of a Tandem-Rotor Helicopter

Faraaz Ahmed·Ludwik Sobiesiak·James Richard Forbes
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Abstract

This letter considers cascaded model predictive control (MPC) as a computationally lightweight method for controlling a tandem-rotor helicopter. A traditional single MPC structure is split into separate outer and inner-loops. The outer-loop MPC uses an $SE_2(3)$ error to linearize the translational dynamics about a reference trajectory. The inner-loop MPC uses the optimal angular velocity sequence of the outer-loop MPC to linearize the rotational dynamics. The outer-loop MPC is run at a slower rate than the inner-loop allowing for longer prediction time and improved performance. Monte-Carlo simulations demonstrate robustness to model uncertainty and environmental disturbances. The proposed control structure is benchmarked against a single MPC algorithm where it shows significant improvements in position and velocity tracking while using significantly less computational resources.

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Faraaz Ahmed, Ludwik Sobiesiak, James Richard Forbes. 2023-06-29. Cascaded Model Predictive Control of a Tandem-Rotor Helicopter. https://doi.org/10.1109/lcsys.2023.3237954

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