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Your search keyword '"Liu, Yungang"' showing total 2 results
Start Over Author "Liu, Yungang" Topic state feedback (feedback control systems) Publication Year Range Last 10 years Publisher ieee
2 results on '"Liu, Yungang"'

1. Switching Adaptive Controller for the Nonlinear Systems With Uncertainties From Unknown Powers.

Author

Wang, Meiqiao, Liu, Yungang, and Man, Yongchao

Subjects
*NONLINEAR systems, *UNCERTAIN systems, *CLOSED loop systems, *STATE feedback (Feedback control systems), *PROGRAMMABLE controllers, *INTEGRATORS
Abstract

This paper considers the global stabilization for a class of uncertain nonlinear systems with unknown powers, unknown control directions, and unknown nonlinearities. Mainly due to the presence of the unknown powers which have not known upper bound, no existing methods are applicable to the control problem to be solved. In this paper, to compensate the serious system uncertainties and particularly to overcome the major obstruction from unknown powers, we appeal to the mechanism of switching adaptive feedback. By flexibly combining the domination and the method of adding a power integrator, we propose a new adaptive controller design, whose design parameters are tuned online based on a switching logic. The designed controller will become operative as long as finite switchings happen and will not lead to Zeno phenomenon, and can guarantee the global boundedness as well as ultimate convergence of the resulting closed-loop system. Two numerical examples are given to demonstrate the effectiveness of the developed design scheme. [ABSTRACT FROM AUTHOR]

Published
2020
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2. Adaptive Control of Uncertain Coupled Reaction–Diffusion Dynamics With Equidiffusivity in the Actuation Path of an ODE System.

Author

Li, Jian and Liu, Yungang

Subjects
*ADAPTIVE control systems, *PARABOLIC differential equations, *ORDINARY differential equations, *KERNEL functions, *CLOSED loop systems, *DISTRIBUTED parameter systems, *STATE feedback (Feedback control systems)
Abstract

This article is devoted to the stabilization via adaptive feedback for a class of uncertain coupled reaction–diffusion dynamics in the actuation path of an ordinary differential equation (ODE) system. The system under investigation, a class of coupled parabolic partial differential equation (PDE)–ODE systems, is more representative since the dynamics in actuation path (i.e., the PDE subsystem) are coupled rather than uncoupled parabolic equations and hence includes those in the related literature as special cases. Moreover, serious parametric uncertainties are present in both PDE and ODE subsystems, which bring obstacles to the traditional methods on this issue. To solve the control problem, an infinite-dimensional backstepping transformation with time-varying matrix-valued kernel functions is adopted to change the original system into a new one. Then, an adaptive state-feedback controller is designed for the new system, which guarantees that all the closed-loop system states are bounded while regulating the original system states to zero. Finally, a simulation example is provided to illustrate the effectiveness of the theoretical results. [ABSTRACT FROM AUTHOR]

Published
2021
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