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6 results on '"Tao, Zhen"'

2. sLOX-1: A Molecule for Evaluating the Prognosis of Recurrent Ischemic Stroke

Author

Zheng, Yangmin, primary, Huang, Yuyou, additional, Li, Lingzhi, additional, Wang, Pingping, additional, Wang, Rongliang, additional, Tao, Zhen, additional, Fan, Junfen, additional, Han, Ziping, additional, Li, Fangfang, additional, Zhao, Haiping, additional, Zhao, Fangfang, additional, Yan, Feng, additional, Liu, Yumei, additional, and Luo, Yumin, additional

Published
2021
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3. Neural Network L1 Adaptive Control of MIMO Systems with Nonlinear Uncertainty

Author

Hong-tao Zhen, Xiao-hui Qi, Jie Li, and Qing-min Tian

Subjects
Technology, Medicine, Science
Abstract

An indirect adaptive controller is developed for a class of multiple-input multiple-output (MIMO) nonlinear systems with unknown uncertainties. This control system is comprised of an L1 adaptive controller and an auxiliary neural network (NN) compensation controller. The L1 adaptive controller has guaranteed transient response in addition to stable tracking. In this architecture, a low-pass filter is adopted to guarantee fast adaptive rate without generating high-frequency oscillations in control signals. The auxiliary compensation controller is designed to approximate the unknown nonlinear functions by MIMO RBF neural networks to suppress the influence of uncertainties. NN weights are tuned on-line with no prior training and the project operator ensures the weights bounded. The global stability of the closed-system is derived based on the Lyapunov function. Numerical simulations of an MIMO system coupled with nonlinear uncertainties are used to illustrate the practical potential of our theoretical results.

Published
2014
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4. Neural NetworkL1Adaptive Control of MIMO Systems with Nonlinear Uncertainty

Author

Xiao-hui Qi, Hong-tao Zhen, Jie Li, and Qing-min Tian

Subjects
Lyapunov function, Mathematical optimization, Adaptive control, Artificial neural network, Computer science, MIMO, General Medicine, Filter (signal processing), General Biochemistry, Genetics and Molecular Biology, Nonlinear system, symbols.namesake, Control theory, Control system, symbols, General Environmental Science
Abstract

An indirect adaptive controller is developed for a class of multiple-input multiple-output (MIMO) nonlinear systems with unknown uncertainties. This control system is comprised of anL1adaptive controller and an auxiliary neural network (NN) compensation controller. TheL1adaptive controller has guaranteed transient response in addition to stable tracking. In this architecture, a low-pass filter is adopted to guarantee fast adaptive rate without generating high-frequency oscillations in control signals. The auxiliary compensation controller is designed to approximate the unknown nonlinear functions by MIMO RBF neural networks to suppress the influence of uncertainties. NN weights are tuned on-line with no prior training and the project operator ensures the weights bounded. The global stability of the closed-system is derived based on the Lyapunov function. Numerical simulations of an MIMO system coupled with nonlinear uncertainties are used to illustrate the practical potential of our theoretical results.

Published
2014

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