http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Global Fixed-time Stabilization for Chained Nonholonomic Systems via Output Feedback Control
Xiandong Chen,Xianfu Zhang 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2
This paper studies the fixed-time output feedback stabilization problem for chained nonholonomic systems. By applying the switching control and bi-limit homogeneous techniques, it is firstly constructed two fixedtime state feedback stabilizing controllers for the considered systems. Then, a new state observer with a formalized switching law is proposed to fixed-time estimate system states, whose high-order terms are applied to get uniform convergence regardless of initial conditions and low-order terms are aimed to the exact convergence in finite time. Finally, based on the bi-limit homogeneous technique and Lyapunov stability theorem, fixed-time output feedback stabilizing controllers, one of which is discontinuous with a specific switching control law and the other is continuous, are constructed and the fixed-time output feedback stabilization of the considered systems is thus guaranteed. An example is presented to show the feasibility of the proposed control strategy.
Weihao Pan,Xianfu Zhang,Hanfeng Li 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.7
This paper focuses on the event-triggered output feedback control problem for a class of large-scale nonlinear time-delay systems with asymmetric dead-zone input. Without knowing the precise priori knowledge of dead-zone parameters, an event-triggered output feedback control strategy is developed based on the dynamic gain design approach. It is proved by the Lyapunov analysis that all signals of the closed-loop system are globally bounded and the system states converge to a bounded region which is adjustable. Moreover, the Zeno behavior is avoided. Compared with the existing results, the considered nonlinear system allows more general growth condition, and the proposed event-triggered control strategy effectively handles dead-zone input, time delay and the more general nonlinear characteristic. Finally, an example is used to illustrate the validity of the proposed control strategy.
Sampled-data-based Event-triggered Control for Multi-agent Systems under Antagonistic Interactions
Yanan Qi,Rui Mu,Xianfu Zhang 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.8
In this paper, the leaderless consensus problem is considered for multi-agent systems under antagonistic interactions. Based on the sampled data, we propose an event-triggered mechanism to determine when the current state should be transmitted. This mechanism inherits the merits of both periodic and event-triggered transmission ways, thus reducing the energy consumption. Then, an event-triggered protocol is designed in a fully distributed manner to guarantee the consensus with the same magnitude but opposite sign. Different from the existing results, the designed protocol is implemented for a general digraph containing a spanning tree, and there is no restriction on the sampling period. Finally, the achievement of consensus and the validity of the obtained protocol are demonstrated by simulations.
Output Feedback Stabilization for a Class of Cascade Nonlinear ODEPDE Systems
Yanjie Chang,Tongjun Sun,Xianfu Zhang,Xiandong Chen 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.7
In this paper, the output feedback stabilization problem is studied for a class of cascade nonlinear ODEPDE systems. The nonlinear terms of ODE-subsystem are assumed to be bounded by a known constant multiplied by unmeasured states, and PDE-subsystem is a diffusion equation. Especially, the unstable diffusion equation is considered. Based on the low gain observer and a series of transformations, the output feedback stabilization problem is converted into designing proper gain parameters. Furthermore, the stability of the closed-loop system is analyzed by Lyapunov theorem. Finally, two numerical examples are given to demonstrate the effectiveness of the proposed control strategy.
Robust H∞ Control for Switched Nonlinear Port-controlled Hamiltonian Systems
Zi-Ming Wang,Airong Wei,Xianfu Zhang 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.8
In the paper, the robust H∞ control for switched nonlinear port-controlled Hamiltonian (SNPCH) systems with external disturbances is investigated via the multiple Lyapunov functions method. Under two cases that the SNPCH system is subject to actuator saturation (AS) and the SNPCH system is without AS, a design approach for the switching robust H∞ feedback controller is developed to attenuate the external disturbances. The sufficient conditions are established for H∞ control of the corresponding closed-loop systems based on Hamilton-Jacobi inequality techniques. Furthermore, via the Hamiltonian realization method, the obtained results are applied to solve the H∞ control for switched nonlinear affine systems with external disturbances. Finally, two numerical examples are presented to illustrate the effectiveness of the proposed H∞ control methods.