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Master-slave synchronization of singular Lur'e systems with time-delay

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控制理论与应用（英文版） 2011年第4期9卷 594-598页

作者： Zebin YANG Xinhua ZHANG xiaofu ji School of Electrical and Information Engineering Jiangsu University Zhenjiang Jiangsu 212013 China

This paper is concerned with the problem of designing a time-delay output feedback control law for masterslave synchronization of singular Lur＇e systems. Using generalized Lyapunov stability theory, a sufficient condition for the existence of such feedback control law is given and an explicit expression of such control law is also achieved. These algorithms are formulated in terms of linear matrix inequalities, which can be easily performed numerically. A numerical example is used to illustrate the effectiveness of the design method.

关键词： Singular Lur'e systems Time-delay synchronization Linear matrix inequality

Stability analysis for discrete linear systems with state saturation by a saturation-dependent Lyapunov functional

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控制理论与应用（英文版） 2012年第4期10卷 539-542页

作者： xiaofu ji Mingwei REN Hongye SU jinfeng GAO School of Electrical and Information Engineering Jiangsu University National Key Laboratory of Industrial Control Technology Institute of Cyber-systems and ControlZhejiang University Institute of Automation Zhejiang Sci-Tech University

This paper concerns the stability analysis problem of discrete linear systems with state saturation using a saturation-dependent Lyapunov functional. We introduce a free matrix characterized by the sum of the absolute value of each elements for each row less than 1, which makes the state with saturation constraint reside in a convex polyhedron. A saturation-dependent Lyapunov functional is then designed to obtain a sufficient condition for such systems to be globally asymptotically stable. Based on this stability criterion, the state feedback control law synthesis problem is also studied. The obtained results are formulated in terms of bilinear matrix inequalities that can be solved by the presented iterative linear matrix ineoualitv algorithm. Two numerical examoles are used to demonstrate the effectiveness of the nronosed method_

关键词： Discrete linear systems State saturation Saturation-dependent Iterative linear matrix inequality

Mixed L_1/H-infinity control for uncertain linear singular systems

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控制理论与应用（英文版） 2009年第2期7卷 134-138页

作者： xiaofu ji Yukun SUN Yonghong HUANG Hongye SU School of Electrical and Information Engineering Jiangsu University Zhenjiang Jiangsu 212013 China National Key Laboratory of Industrial Control Technology Zhejiang University Hangzhou Zhejiang 310027 China

The mixed L1/H-infinity control problem for a class of uncertain linear singular systems is considered using a matrix inequality approach. The purpose is to design a state feedback control law such that the resultant closed-loop system is regular, impulse-free, stable and satisfies some given mixed L1/H-infinity performance. A sufficient condition for the existence of such control law is given in terms of a set of matrix inequalities by the introduction of inescapable set and ＊-norm. When these matrix inequalities are feasible, an explicit expression of the desired state feedback control law is given. A numerical example is used to demonstrate the applicability of the proposed approach.

关键词： Mixed L 1/H-infinity optimization Robust control Uncertain linear singular system Matrix inequality

Robust stabilization for a class of nonlinear networked control systems

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控制理论与应用（英文版） 2008年第3期6卷 300-304页

作者： jinfeng GAO Hongye SU xiaofu ji jian CHU State Key Laboratory of Industrial Control Technology Institute of Advanced Process Control Zhejiang University Hangzhou Zhejiang 310027 China School of Electrical and Information Engineering Jiangsu University Zhenjiang Jiangsu 212013 China

The problem of robust stabilization for a class of uncertain networked control systems （NCSs） with nonlinearities satisfying a given sector condition is investigated in this paper. By introducing a new model of NCSs with parameter uncertainty, network-induced delay, nonlinearity and data packet dropout in the transmission, a strict linear matrix inequality （LMI） criterion is proposed for robust stabilization of the uncertain nonlinear NCSs based on the Lyapunov stability theory. The maximum allowable transfer interval （MATI） can be derived by solving the feasibility problem of the corresponding LMI. Some numerical examples are provided to demonstrate the applicability of the proposed algorithm.

关键词： Networked control systems (NCSs) Robust control Nonlinearity Linear matrix inequality (LMI)

Robust D stabilization of singular systems with polytopic uncertainties

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控制理论与应用（英文版） 2010年第4期8卷 540-544页

作者： jianjun BAI Hongye SU xiaofu ji jinfeng GAO State Key Laboratory of Industrial Control Technology Institute of Cyber-System and Control Zhejiang University Hangzhou Zhejiang 310027 China School of Electrical and Information Engineering Jiangsu University Zhenjiang Jiangsu 212013 China Institute of Automation Zhejiang Sci-Tech University Hangzhou Zhejiang 310018 China

The robust D stabilization problem is considered for singular systems with polytopic uncertainties in this *** the derivative matrix E and the state matrix A are with uncertainties,which were not considered ***,with the introduction of some free matrices,a necessary and sufficient condition for the singular system to be D stable is proposed,based on which,the robust D stable problem is solved,and a sufficient condition for the closed system to be robust D stabilizable is *** desired state feedback controller is given in an explicit *** examples show the efficiency of the proposed approach.

关键词： Singular system Robust D stabilization Free matrices LMI region

Research on the ultracapacitor/battery hybrid system 25th

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Research on the ultracapacitor/battery hybrid system

An LMI approach to robust H-infinity control for uncertain singular time-delay systems

第25届中国控制与决策会议

作者： Wang Qi Sun Yukun Chen Kunhua Huang Yonghong ji xiaofu School of Electrical and Information Engineering Jiangsu University School of Electrical Power Engineering Nanjing institute of technology

ISBN: (纸本)9781467355339

The ultracapacitor/battery hybrid system makes the best of the characteristics of high energy density of battery and long cycle life of ultracapacitor. The mathematical model of ultracapacitor/battery hybrid system was set up, and the characters of it such as peak power enhancement were studied and the correlative factors were analyzed in this paper. Ultracapacitor and battery are connected in parallel by a bi-directional buck-boost converter. Model the ultracapacitor/battery hybrid system under MATLAB 7 and use a double loop PWM to control. The result shows that battery and ultracapacitor could work in optimizing discharge condition when the load power is pulsating. The bi-directional buck-boost converter has better performance and practicability.

关键词： battery ultracapacitor the ultracapacitor/battery hybrid system a bi-directional buck-boost converter

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控制理论与应用（英文版） 2006年第4期4卷 361-366页

作者： xiaofu ji Hongye SU jian CHU Institute of Advanced Process Control Zhejiang University Hangzhou Zhejiang 310027 China

The problem of robust H-infinity control for a class of uncertain singular time-delay systems is studied in this paper. A new approach is proposed to describe the relationship between slow and fast subsystems of singular time- delay systems, based on which, a sufficient condition is presented for a singular time-delay system to be regular, impulse free and stable with an H-infinity performance. The robust H-infinity control problem is solved and an explicit expression of the desired state-feedback control law is also given. The obtained results are formulated in terms of strict linear matrix inequalities （LMIs） involving no decomposition of system matrices. A numerical example is given to show the effectiveness of the proposed method.

关键词： Robust H-infinity control Singular system Time-delay Linear matrix inequality (LMI)

Improved Robust Stability Criterion for Uncertain Discrete-time Singular Time-delay Systems

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Improved Robust Stability Criterion for Uncertain Discrete-t...

基于FCM与集成高斯过程回归的赖氨酸发酵软测量

第37届中国控制会议

作者： xiaofu ji Shanshan Gan Kai Wang Key Laboratory of Advanced Process Control for Light Industry Ministry of EducationSchool of Internet of Things Engineering Jiangnan University

This paper is concerned with the robust stability problem for uncertain discrete-time singular time-delay systems. By using Jensen inequality, a new sufficient condition is given to ensure a discrete-time singular time-delay to be regular, causal and stable, based on which, a sufficient robust stability criterion for the considered uncertain discretetime singular time-delay system is given. It should be mentioned that a symmetric matrix in the designed LyapunovKrasovskii functional are not confined to be positive definite, which comparatively reduces the conservativeness of this criterion. The obtained results are expressed in terms of linear matrix inequalities（LMIs）, which are easy to resolve using the inner point algorithm. Two numerical examples illustrate the less conservativeness of the presented results.

关键词： Discrete singular system time-delay system robust stability Jensen inequality linear matrix inequality

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智能系统学报 2015年第1期10卷 156-162页

作者：嵇小辅张翔江苏大学电气信息工程学院江苏镇江212013

为解决赖氨酸发酵过程中菌体浓度难以在线检测的难题,提出一种基于模糊C均值聚类(FCM)与集成高斯过程回归(GPR)的软测量建模方法。针对典型生物发酵过程可分为延滞期、指数生长期、稳定期、死亡期4个反应周期的特点,采用模糊C均值聚类... 详细信息

为解决赖氨酸发酵过程中菌体浓度难以在线检测的难题,提出一种基于模糊C均值聚类(FCM)与集成高斯过程回归(GPR)的软测量建模方法。针对典型生物发酵过程可分为延滞期、指数生长期、稳定期、死亡期4个反应周期的特点,采用模糊C均值聚类算法对样本集进行聚类分析以形成若干子样本集;对每个子样本集分别采用高斯过程回归训练时,为提高GPR模型的泛化能力,利用Adaboost算法提升GPR模型,分别在各子集建立集成GPR软测量子模型;采用欧氏距离计算新样本点对应于每一子模型的隶属度;加权求和获得最终的软测量模型的预测输出。基于氨基酸类典型菌种L-赖氨酸反应过程菌体浓度参数预测的试验研究表明:与全局单一GPR模型、集成GPR模型和基于FCM与多GPR模型相比,所建立的基于FCM与集成GPR软测量模型拟合精度高,泛化能力强,较好地满足了赖氨酸发酵过程的控制要求。

关键词：高斯过程回归(GPR) 模糊C均值聚类(FCM) Adaboost算法 L-赖氨酸软测量欧氏距离隶属度加权求和