Model-free tracking control of complex dynamical trajectories with machine learning

Zheng-Meng Zhai, Mohammadamin Moradi, Ling-Wei Kong, Bryan Glaz, Mulugeta Haile and Ying-Cheng Lai ()
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Zheng-Meng Zhai: Arizona State University
Mohammadamin Moradi: Arizona State University
Ling-Wei Kong: Arizona State University
Bryan Glaz: DEVCOM Army Research Laboratory
Mulugeta Haile: DEVCOM Army Research Laboratory
Ying-Cheng Lai: Arizona State University

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Nonlinear tracking control enabling a dynamical system to track a desired trajectory is fundamental to robotics, serving a wide range of civil and defense applications. In control engineering, designing tracking control requires complete knowledge of the system model and equations. We develop a model-free, machine-learning framework to control a two-arm robotic manipulator using only partially observed states, where the controller is realized by reservoir computing. Stochastic input is exploited for training, which consists of the observed partial state vector as the first and its immediate future as the second component so that the neural machine regards the latter as the future state of the former. In the testing (deployment) phase, the immediate-future component is replaced by the desired observational vector from the reference trajectory. We demonstrate the effectiveness of the control framework using a variety of periodic and chaotic signals, and establish its robustness against measurement noise, disturbances, and uncertainties.

Date: 2023
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DOI: 10.1038/s41467-023-41379-3

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