Abstract
In this article, an adaptive neural network (NN) control problem is studied for nonstrict-feedback multi-input multi-output (MIMO) nonlinear systems with unmeasurable states and unknown hysteresis. Firstly, to estimate the unmeasurable states, a NN state observer is constructed. Additionally, the unknown nonlinear terms are online approximated by using radial basis function-neural networks (RBF-NNs). And then, the complexity problem is addressed by using the dynamic surface control (DSC), which is easy to overcome the problem of repeated differentiations for virtual control signals. Furthermore, a nonlinear gain feedback function is introduced into the backstepping design procedure to improve the dynamic performance of the closed-loop system. Meanwhile, to satisfy the practical engineering application, a prescribed performance control (PPC) technique is implemented to guarantee the tracking error can converge to a preassigned area. By using the proposed control scheme, all closed-loop signals are semi-global uniformly ultimately bounded (SGUUB). At last, the preponderance and usefulness of the proposed controller are indicated by simulation results.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China under Grant (52101346), (62122046), (61973204) and supported by the Shanghai Committe of Science and Technology, China Grant (23010500100).
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Liu, X., Shi, Y., Wu, N. et al. Observer-based adaptive backstepping control for Mimo nonlinear systems with unknown hysteresis: a nonlinear gain feedback approach. Neural Comput & Applic 35, 23265–23281 (2023). https://doi.org/10.1007/s00521-023-08896-0
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DOI: https://doi.org/10.1007/s00521-023-08896-0