期刊
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
卷 64, 期 1, 页码 359-364出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAC.2018.2828084
关键词
Bounded almost surely; input saturation; output feedback; stochastic nonlinear systems; time-varying delay
资金
- NSFC [61673215, 61374087, 61403199, 61473151]
- Natural Science Foundation of Jiangsu Province [BK20140770, BK20131097]
- Fundamental Research Funds for the Central Universities [30916015105]
- 333 Project [BRA2017380]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13072]
- PAPD
- Key Laboratory of Jiangsu Province
- Natural Science Fund for Distinguished Young Scholars of Jiangsu Province [BK20150034]
- Program for New Century Excellent Talents in University [NCET-13-0859]
- Postgraduate Research AMP
- Practice Innovation Program of Jiangsu Province [KYCX17_0364]
This paper is concerned with the problem of global output-feedback control for a class of stochastic nonlinear time-delay systems in the presence of input saturation and unmeasurable states. As a distinctive feature, the growth assumptions imposed on the drift and diffusion terms are proven to be unnecessary, which can be removed through a technical lemma. In addition, by introducing an auxiliary system whose order is the same as the considered system, and using Lyapunov-Krasovskii functional, the adverse effects generated by input saturation and time-varying delay are eliminated. Then, based on state-observer and backstepping recursive design, an output-feedback controller is constructed to render the closed-loop system be globally bounded almost surely. Particularly, instead of converging to an arbitrarily small neighborhood of zero as in related results, the tracking error is ensured to be tuned by the design parameters and an input saturation error in the mean quartic sense. Finally, a stochastic chemical reactor system is established and shown to demonstrate the effectiveness of the proposed scheme.
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