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Ma, Haoxiang; Xiong, Shixun; Fu, Zhumu; Tao, Fazhan; Ji, Baofeng

High-order disturbance observer-based safe tracking control for a class of uncertain MIMO nonlinear systems with time-varying full state constraints. (English) Zbl 07832797

Appl. Math. Comput. 466, Article ID 128430, 20 p. (2024).
Summary: This paper investigates a high-order disturbance observer-based safe tracking control scheme for a class of uncertain multiple-input and multiple-output systems under time-varying full state constraints and disturbances. To achieve the safe tracking objective, a boundary protection algorithm is introduced to generate new safe desired signals which are within corresponding state constraints. An improved second-order dynamic surface control technology is developed to deal with the piecewise differentiability of safe desired signals and the phenomenon of repeatedly differentiation, simultaneously. To handle the negative effects of system uncertainties and obtain better estimation effect of high order time-varying disturbances, the radial basis function neural networks and high-order disturbance observer methods are developed. The safety and performance of the closed-loop nonlinear system under the proposed control scheme have been rigorous proved and discussed by Lyapunov stability analysis. Finally, a two-link manipulator model has been given as an example, and the numerical simulations are given to express the availability of the proposed controller.

Cited in 1 Document

MSC:

93C15 Control/observation systems governed by ordinary differential equations
93B53 Observers
93C40 Adaptive control/observation systems

Keywords:

uncertain MIMO nonlinear system; safe tracking control; neural network; high-order disturbance oserver; second-order filter
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References:

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