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H_∞ DOF Control of Stochastic Systems with Time-varying Delay and L_∞ Disturbance
Guanglei Zhao,Jingcheng Wang 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.4
This paper considers the problem of H∞ dynamic output feedback (DOF) control for a class of stochastic systems with time-varying delay and L∞ disturbance. A new delay-dependent sufficient condition for the existence of the DOF controller is derived and the controller design method is given in the form of bilinear matrix inequalities (BMIs). Moreover, a variable step size path-following algorithm is proposed to solve the BMI problem. Numerical examples are given to illustrate the effectiveness of the proposed methods.
Stability Analysis of Periodic Triggering Reset Control Systems
Guanglei Zhao,Jingcheng Wang,Bin Zhang 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.4
In most literature related to reset control, the reset actions are triggered by continuous monitoring triggering reset conditions, which is not suitable for computer-based implementation. This paper considers periodic triggering reset control, where the reset actions are only triggered at periodically sampling instants. Hybrid system approach is given to analyze the asymptotic stability and L2 gain property, and less conservative switched system approach is presented for asymptotic stability analysis. The comparison of the two approaches is discussed. Moreover, novel reset conditions are given to improve the overshoot performance. Simulations are presented to support our results.
Guanglei Zhao,Guangbo Chen,Jiannan Chen,Chang-chun Hua 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.9
This paper investigates finite-time control for image-based visual servoing (IBVS) of a quadrotor subjects to image dynamics uncertainties and external disturbances. The quadrotor model is firstly proposed, based on this model and suppose that sensors on quadrotor only use a monocular camera and an inertial measurement unit, the image dynamics is developed by defining appropriate image features on virtual image plane and by means of perspective projection. The constructed visual model of the quadrotor, which includes 12 states, is decomposed into 6 subsystems in order to design the finite-time controller. Then, nonsingular fast terminal sliding model (NFTSM) finite-time controller is designed, and Lyapunov-based finite-time convergence and disturbance rejection properties are proved. Finally, simulation results are provided to demonstrate the effectiveness of the proposed results.
Guanglei Zhao,Zhao Wang,Xiuwei Fu 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.4
This paper investigates the event-triggered consensus problem of multi-agent systems with uncertainties and input saturation. First, a fully distributed robust consensus low-gain feedback control strategy is proposed, in which some global information, such as the communication graph and the scale of network, is not needed. Then, by defining an internal dynamic variable to memory the past state, an adaptive dynamic event-triggering mechanism is proposed, which contributes to reducing the usage of communication resources and also does not rely on any global information. Furthermore, Lyapunov-based consensus analysis results are presented, and it is also formally shown that Zeno behavior can be excluded with the proposed consensus protocols. Finally, a numerical example is provided to illustrate the effectiveness of the proposed results.
Guanglei Ji,Kuang-Cai Chen,Yan-Gang Yang,Guoqing Xin,이용일,Hong-Guo Liu 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.9
CdS nano-particulate films were prepared at the air/water interface under Langmuir monolayers of arachidic acid (AA)via interfacial reaction between Cd2+ ions in the subphase and H2S molecules in the gaseous phase. The films were made up of fine CdS nanoparticles with hexagonal Wurtzite crystal structure after reaction. It was revealed that the formation of CdS nano-particulate films depends largely on the experimental conditions. When the films were ripened at room temperature or an increased temperature (60 oC) for one day, numerous holes were appeared due to the dissolution of smaller nanoparticles and the growth of bigger nanoparticles with an improved crystallinity. When the films were ripened further, CdS rodlike nanoparticles with cubic zinc blende crystal structure appeared due to the re-nucleation and growth of CdS nanoparticles at the stacking faults and defect structures of the hexagonal CdS grains. These structures were characterized by transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and X-ray diffraction (XRD). These results declare that CdS semiconductor nanoparticles formed at the air/water interface change their morphologies and crystal structures during the ripening process due to dissolution and recrystallization of the particles.
Distributed Reset Control for Leader-following Consensus of Nonlinear Multi-agent Systems
Guanglei Zhao,Hailong Cui,Zhijie Li 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.3
This paper studies the leader-following consensus problem of nonlinear multi-agent systems with directed graph. A distributed reset control protocol that has jumping changes is proposed for the purpose of improving transient consensus performance. First, the case with continuous communication between neighboring agents is considered, and the obtained results are extended to the case with asynchronous sampling, which is more practical under network environment. Then, a hybrid model consisting of both flow dynamics and jump dynamics is constructed for the closed-loop system to deal with different jump dynamics in an unified framework. Based on this model, sufficient conditions are derived for consensus analysis. Finally, numerical examples are presented to testify the effectiveness of theoretical results.
Ji, Guanglei,Chen, Kuang-Cai,Yang, Yan-Gang,Xin, Guoqing,Lee, Yong-Ill,Liu, Hong-Guo Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.9
CdS nano-particulate films were prepared at the air/water interface under Langmuir monolayers of arachidic acid (AA) via interfacial reaction between $Cd^{2+}$ ions in the subphase and $H_2S$ molecules in the gaseous phase. The films were made up of fine CdS nanoparticles with hexagonal Wurtzite crystal structure after reaction. It was revealed that the formation of CdS nano-particulate films depends largely on the experimental conditions. When the films were ripened at room temperature or an increased temperature ($60^{\circ}C$) for one day, numerous holes were appeared due to the dissolution of smaller nanoparticles and the growth of bigger nanoparticles with an improved crystallinity. When the films were ripened further, CdS rodlike nanoparticles with cubic zinc blende crystal structure appeared due to the re-nucleation and growth of CdS nanoparticles at the stacking faults and defect structures of the hexagonal CdS grains. These structures were characterized by transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and X-ray diffraction (XRD). These results declare that CdS semiconductor nanoparticles formed at the air/water interface change their morphologies and crystal structures during the ripening process due to dissolution and recrystallization of the particles.