Abstract
In this paper, an adaptive neural network controller is designed for non-strict feedback systems with full-state constraints. According to practical applications, both input saturation and unmodeled dynamics are also taken into account. By using a logarithm nonlinear mapping, non-strict feedback systems with full-state constraints can be converted to unconstrained ones, which may result in some exponential terms. Here, a new variable separation method is proposed based on Taylor’s formula to cope with the exponential terms and non-strict structure. Then, the relationship between the norm of state vector and error functions is established. A hyperbolic tangent function and a dynamic signal are introduced to deal with input saturation and unmodeled dynamics, respectively. It is proved that all signals of the closed-loop system are uniformly ultimately bounded and the requirement of full-state constraints is satisfied. Two illustrative examples are provided to demonstrate the effectiveness of the presented method.
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This work is supported by the National Natural Science Foundation of China (Nos. 61773097, U1813214) and the Fundamental Research Funds for the Central Universities (No. N160402004).
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Ye, D., Cai, Y., Yang, H. et al. Adaptive neural-based control for non-strict feedback systems with full-state constraints and unmodeled dynamics. Nonlinear Dyn 97, 715–732 (2019). https://doi.org/10.1007/s11071-019-05008-3
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DOI: https://doi.org/10.1007/s11071-019-05008-3