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New synthesis design of adaptive back-stepping controller for static SVC

New synthesis design of adaptive back-stepping controller fo...

引用

European Control Conference (ECC)

作者： Jun Fu Tatyana D. Kolemisevska-Gugulovska Georgi M. Dimirovski Jun Zhao Faculty of Information Science and Engineering Northeastern University Shenyang P. R. of China Faculty of Electrical Engineering SS Cyril and Methodius University Skopje R. of Macedonia Department of Computer Engineering Dogus University Istanbul R. of Turkey

A new synthesis design for nonlinear adaptive control of Static VAR Compensator for a single-machine infinite-bus system with SVC is derived and proved. The proposed method differs from the “traditional” adaptive back-stepping in both ways how the parameter estimator is constructed and the nonlinear gains are assigned. In comparison with the existing traditional adaptive back-stepping controller, the proposed approach does not follow the classical certainty-equivalence philosophy for the first time, thus yielding the novel parameter estimator and feedback controller dynamics in dealing with unknown parameters. Computer simulation experiments demonstrated that the proposed approach is considerably superior to the control synthesis based on “classical” adaptive back-stepping in terms of the properties of stability and parameter estimation. Results show that the proposed design almost completely recovers the performance of the “full-information” controller.

关键词： Static VAr compensators Power system stability Power system dynamics Mathematical model Adaptive control Generators

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Stabilization Control for a Class of Switched Fuzzy Discrete-Time Systems

Stabilization Control for a Class of Switched Fuzzy Discrete...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Hong Yang Honghai Liu Georgi M. Dimirovski Jun Zhao Control Science Institute of the School of Information and Engineering Northeastern University Shenyang Liaoning China Institute of Industrial Research University of Portsmouth Portsmouth UK Department of Computer Engineering of the Faculty of Engineering Dogus University Istanbul Turkey

Stability issues for switched systems whose subsystems are all Sugeno fuzzy discrete-time systems are studied and new stabilization control results derived. Innovated representation models for switched fuzzy systems are proposed. The single Lyapunov function method has been adopted to study the stability of this class of switched fuzzy systems. Sufficient conditions for quadratic asymptotic stability are presented and stabilizing switching laws of the state-dependent form employed in PDC scheme are designed. Illustrative examples demonstrate the effectiveness and the feasible performance of the proposed synthesis through the respective simulation results.

关键词： Control systems Fuzzy control Fuzzy systems Switched systems Sliding mode control Lyapunov method Asymptotic stability Control system synthesis Optimal control Sufficient conditions

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Exponential Synchronization of Complex Delayed Dynamical Networks with General Topology

Exponential Synchronization of Complex Delayed Dynamical Net...

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Proceedings of the 46th IEEE Conference on Decision and Control, Pages 460-918

作者： Tao Liu Georgi M. Dimirovski Jun Zhao Key Laboratory of Integrated Automation of Process Industry Ministry of Education Faculty of Information Science and Engineering Northeastern University Shenyang Liaoning China Faculty of Electrical and Computer Engineering SS Cyril and Methodius University Skopje Macedonia Department of Computer Engineering Dogus University Istanbul Turkey

ISBN: (纸本)9781424414970;1424414970

The global exponential synchronization of complex delayed dynamical networks possessing general topology is investigated in this contribution. The network model considered can represent both the directed and undirected weighted networks. Novel delay-dependent linear controllers are designed via Lyapunov stability theory and appropriate property of the coupling matrix. It is shown that the controlled network is globally exponentially synchronized with a given convergence rate. Two examples of typical dynamical networks with coupling delays of this class, one possesses directed and the other with undirected coupling topology, both having a Lorenz system at each node, have been used to demonstrate and verify the novel control design proposed.

关键词： Mentoring topology design control dynamic network Network Exponential network model linear controllers

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Fault-tolerant Control of Uncertain Time-delay Discrete-time Systems Using T-S Model

Fault-tolerant Control of Uncertain Time-delay Discrete-time...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： Le Zhang Yuan-Wei Jing Rong-Zhen Chen Honghai Liu Georgi M. Dimirovski Control Science Institute of the School of Information Science and Engineering Northeastern University Shenyang China Institute of Industrial Research University of Portsmouth Portsmouth UK SS Cyril and Methodius Faculty of Electrical & Computer Engineering University of Skopje Skopje Macedonia Computer Eng. Department Dogus University Istanbul Turkey

The investigated control problem of nonlinear time-delay discrete-time systems is addressed using Takagi-Sugeno model. Parametric uncertainty and time-delay terms are employed in building the Takagi-Sugeno model for the controlled plant for the purpose of close representation of the original plant system. The integrity and robustness are guaranteed for the closed-loop fuzzy system in sense of Lyapunov stability method via fuzzy state observers. Sufficient conditions for the fuzzy system to possess integrity against actuator failures and sensor failures in the closed-loop are derived in terms of linear matrix inequalities under assumption of known bounds on uncertainties. The results for trailer-truck example are used to illustrate the effectiveness of the method.

关键词： Fault tolerant systems Fuzzy systems Takagi-Sugeno model Uncertainty Nonlinear control systems Robust stability Lyapunov method Sufficient conditions Hydraulic actuators Sensor systems

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Decentralized Synchronization of an Uncertain Complex Dynamical Network

Decentralized Synchronization of an Uncertain Complex Dynami...

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American Control Conference (ACC)

作者： Wei-Song Zhong Georgi M. Dimirovski Jun Zhao Key Laboratory Integrated Automation of Process Industry-Ministry of Education and School of Information Science Engineering Respectively Northeastern University Shenyang Liaoning China SS Cyril and Methodius Faculty of Electrical Engineering Information Technologies Skopje Macedonia Department of Computer Engineering Dogus University Kadikoy Turkey

A class of uncertain time-varying complex dynamical networks is studied in this paper and a model introduced. On the grounds of that model then the locally and globally decentralized synchronization of these networks are thoroughly investigated. Several network synchronization criteria are deduced. Especially, the assumptions adopted and decentralized control laws designed are considerably simple. An illustrative example along with the respective numerical and computer simulation results is also given to demonstrate the effectiveness of the proposed synchronization control synthesis.

关键词： Complex networks Network synthesis Large-scale systems Robust control Distributed control Control systems Network topology Robustness Chaos Robust stability

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An image watermarking scheme using non-tensor wavelets

An image watermarking scheme using non-tensor wavelets

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International Conference on Wavelet Analysis and Pattern Recognition (ICWAPR)

作者： Qingyan He Xinge You Patrick S. Wang Yuanyuan Tang Faculty of Mathematics and computer Science Hubei university Wuhan China Department of Elicronics and Information Engineering Huazhong University of Science and Technology Wuhan China College of Computer and Information Scince Northeastern University Boston MA USA Department of Computer Scince Hong Kong Baptist University Hong Kong China

Watermarking plays a significant role in copyright protection. In this paper, a new method of digital watermarking is proposed based on a new non-tensor bivariate wavelet filter banks with linear phase, which are constructed from the centrally symmetric matrices. Our investigation demonstrates that the constructed non-tensor product bivariate wavelet filters have the following desirable properties, namely, its corresponding wavelet transform can detect more singularities of the host image with reflecting whole orientation while only three orientations being considered by traditional discrete separable transform(DWT). For this reason, details are given more in middle and high frequency, the imperceptible and robust requirements of watermarks are fulfilled and optimized. Some experiments with detailed comparisons with DWT are carried out. Experiments are conducted and positive results are achieved, which show that the proposed watermarking scheme is applicable to the gray image, and the watermark is robust against noise, compression, scaling, cropping and sharpening.

关键词： Watermarking Wavelet analysis Pattern analysis Pattern recognition

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Micromechanical analysis of excavation damaged zone in anisotropic rock mass

Micromechanical analysis of excavation damaged zone in aniso...

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作者： Wang, Shuhong Qiao, Dengpan Jia, Peng Zhang, Nan School of Resource and Civil Engineering Northeastern University 110004 China Faculty of Land Resources Engineering Kunming University of Science and Technology Kunming 650093 China

Rock is a heterogeneous and anisotropic compound material, containing many shear surfaces, cracks, weak surfaces and faults. Damage and failure in a rock mass can occur through sliding along persistent discontinuities, or fractures. A new micromechanical approach to modeling the mechanical behavior of excavation damaged or disturbed zone (EDZ) of anisotropic rock is presented based on knowledge of the inhomogeneity of rock. In this numerical model, damage is analyzed as a direct consequence of microcracks growth. A study of the effect of elastic and failure anisotropy plus inhomogeneity on the underground excavations reveals that the modes of failure can be significantly influenced by the rock structure on the small and large scales. Fractures that develop progressively around underground excavations can be simulated using a numerical code called RFPA (Realistic Failure Process Analysis). This code incorporates the microscopic inhomogeneity in Young's modulus and strength characteristic of rock. In the numerical models of a rock mass, values of Young's modulus and rock strength are realized according to a Weibull distribution in which the distribution parameters represent the level of inhomogeneity of the medium. Another notable feature of this code is that no a priori assumptions need to be made about where and how fracture and failure will occur - cracking can occur spontaneously and can exhibit a variety of mechanisms when certain local stress conditions are met. These unique features have made RFPA capable of simulating the whole fracturing process of initiation, propagation and coalescence of fractures around excavations under a variety of loading conditions. The results of the simulations show that the code can be used not only to produce fracturing patterns similar to those reported in previous studies, but also to predict fracturing patterns under a variety of loading conditions. The numerical model was able to reproduce the associated complex stress pattern

关键词： Rocks

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A descriptor system approach to robust H∞ control and its application to flight control

A descriptor system approach to robust H∞ control and its a...

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2006 American Control Conference

作者： Dai, Shi-Lu Dimirovski, Georgi M. Zhao, Jun Faculty of Information Science and Engineering Northeastern University 110004 Shenyang China Department of Computer Engineering Faculty of Engineering Dogus University Kadikoy TR-34722 Istanbul Turkey SS Cyril and Methodius University Faculty of Electrical Engineering MK-1000 Skopje Mk

ISBN: (纸本)1424402107

This paper investigates the problems of robust H∞ performance analysis and control synthesis for linear systems, having polytopic type of uncertainties, via the parameter-dependent Lyapunov functions. First, via employing a descriptor model transformation of the system, a H ∞ performance criterion in terms of linear matrix inequalities is derived. This H∞ performance criterion can be adopted for robust controller synthesis as shown. The H∞ performance criterion is applied to design flight tracking controller for aircraft dynamic systems with multiple operating points. These results illustrate the effectiveness of the proposed approach. © 2006 IEEE.

关键词： Control systems

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ABR traffic control over ATM network using fuzzy immune-PID controller

ABR traffic control over ATM network using fuzzy immune-PID ...

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2006 American Control Conference

作者： Ren, Tao Dimirovski, Georigi M. Jing, Yuan-Wei Faculty of Information Science and Engineering Northeastern University 110004 Shenyang Liaoning China Faculty of Engineering Computer Engg. Dept. Dogus University of Istanbul TR-347222 Istanbul Turkey

ISBN: (纸本)1424402107

In this paper, we address an end-to-end congestion control algorithm for the available-bit-rate (ABR) traffic in high speed asynchronous-transfer-mode (ATM) networks. A fuzzy immune PID controller is designed to overcome the adverse effect on ATM network caused by uncertainties such as the number of users, the available-bit-rate bandwidth, and the transmission propagation delays. Further, an algorithm is proposed that can guarantee the minimum cell rate in order to ensure the fair and full utilization of the bandwidth. Simulation investigation has been carried out and the results show the proposed control system is robust and performs effectively in adaptive mode. Thus the quality-of-service (QoS) is guaranteed too. © 2006 IEEE.

关键词： Telecommunication traffic

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Numerical modelling and assessment of excavation damaged zone around the underground excavations: A case study

Numerical modelling and assessment of excavation damaged zon...

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作者： Qiao, Dengpan Zhang, Zongsheng Wang, Shuhong Zhang, Yabin Faculty of Land Resources Engineering Kunming University of Science and Technology Kunming 650093 China School of Resource and Civil Engineering Northeastern University Shenyang 110004 China

This paper presents a study on the quantification of the degree of damage from the microseismic event data, for assessment of excavation damaged zone of anisotropic rock in Jinchuan mine and presents numerical simulation and prediction on the deformation and failure of the rock masses surrounding laneway under rock mass properties and excavating conditions. Following an introduction to the engineering geology and mechanical properties of the rock mass in the Jinchuan mine areas, this paper reveals the features of the measured in situ stresses and puts emphasis on an analysis of the mechanism of underground opening and damage induced by the underground mining. Stress and AE redistribution induced by excavation of underground engineering results in the unloading zone in parts of surrounding rock masses. A micromechanics-based model has been proposed for brittle rock material undergoing irreversible changes of their microscopic structures due to microcrack growth. A systematical numerical modeling analysis method was completed. Based on numerical modelling, a series of predicting curves for rock mass response and deformation are obtained, which provides the basis of guiding the design and construction of anisotropic rock cave in Jinchuan mine. The use of the in situ stress field results in enhanced modeling of the stress concentrations and potential failures at the mines has also been reviewed. Knowledge of the prevailing rock stress field at the mines is a critical component for such modeling which has led to improved rock mechanics understanding and operations at Jinchuan mines.

关键词： Excavation

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