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Southeastern Symposium on System Theory

作者： M. Ketel N.S. Dogan A. Homaifar Department of Computer Science North Carolina Agriculture and Technical State University Greensboro NC USA Department of Electrical & Computer Engineering North Carolina Agriculture and Technical State University Greensboro NC USA NASA Autonomous Control and Information Technology Center North Carolina Agriculture and Technical State University Greensboro NC USA

Distributed sensor networks (DSNs) are being developed for a wide range of applications. A sensor networks consist of a large number of nodes performing distributed sensing/event detection. Sensor nodes are energy-constrained, efficient routing is essential for increasing the lifetime of a sensor network. A DSN requires interoperability, low latency, and low power consumption in order to operate for long periods of time. Due to power constraints, DSN should be able to operate at low data rates and still delivering acceptable quality of service. In a DSN the energy required for communications tasks is usually much greater than the energy required for computational tasks. To reduce the data communication between nodes and to maximize the network lifetime, we propose to use the mobile-agent paradigm. In mobile-agent based DSN9 instead of moving data from an individual sensor node to a processing center as in the client-server based computing, mobile agents are dispatched from the processing center to the sensor nodes and process data locally. By moving code to the data, a mobile agent can reduce latency, bandwidth and vulnerability to network disconnection.

关键词： Mobile agents computer networks Routing Data communication Bandwidth Wireless communication Application software Delay Wireless sensor networks Capacitive sensors

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Hybrid systems: Generalized solutions and robust stability 6

Hybrid systems: Generalized solutions and robust stability

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6th IFAC Symposium on Nonlinear control Systems, NOLCOS 2004

作者： Goebel, Rafal Hespanha, Joao Teel, Andrew R. Cai, Chaohong Sanfelice, Ricardo Center for Control Engineering and Computation and Electrical and Computer Engineering Department University of California Santa BarbaraCA93106-9560 United States

Robust asymptotic stability for hybrid systems is considered. For this purpose, a generalized solution concept is developed. The first step is to characterize a hybrid time domain that permits an efficient description of the convergence of a sequence of solutions. Graph convergence is used. Then a generalized solution definition is given that leads to continuity with respect to initial conditions and perturbations of the system data. This property enables new results on necessary conditions for asymptotic stability in hybrid systems. Copyright © 2004 IFAC.

关键词： Lyapunov functions

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Improvement of low frequency oscillation damping in power systems via an adaptive critic based neurofuzzy controller 8th

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8th International Conference on Knowledge-Based Intelligent Information and engineering Systems, KES 2004

作者： Rashidi, Farzan Moshiri, Behzad Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Iran

ISBN: (纸本)9783540232056

This paper proposes an Adaptive Critic Based Neuro-Fuzzy controller (ACBNFC) to Thyristor controlled Series Capacitor (TCSC), which might have a significant impact on power system dynamics. The function of the ACBNFC is to control a firing angle of the TCSC. The proposed method is used for damping the low frequency oscillations caused by disturbances such as a sudden change of small or large loads or an outage in the generators or transmission lines. To evaluate the usefulness of the proposed method, the computer simulation for single machine infinite system is performed and compared with fuzzy PD controller. Obtained results show the proposed control strategy is very robust, flexible and could be used to get the desired performance levels. The response time is also very fast. Simulation results that have been compared with fuzzy PD controller show that our method has the better control performance than fuzzy PD controller. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Damping

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Hybrid systems: Generalized solutions and robust stability 1

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IFAC Proceedings Volumes 2004年第13期37卷 1-12页

作者： Rafal Goebel Joao Hespanha Andrew R. Teel Chaohong Cai Ricardo Sanfelice Center for Control Engineering and Computation & Electrical and Computer Engineering Department University of California Santa Barbara CA 93106-9560

关键词： Hybrid systems generalized solutions set convergence set-valued maps asymptotic stability lyapunov functions robustness

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Sliding mode congestion control in differentiated service communication networks

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2nd International Conference on Wired/Wireless Internet Communications, WWIC 2004

作者： Ebrahimirad, Hassan Yazdanpanah, M.J. Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Iran

ISBN: (纸本)3540209549

The rapid growth of the Internet and increased desmand to use the Internet for voice and video applications necessitate the design and utilization of new Internet architectures with effective congestion control algorithms. As a result, the Differentiated Service (Diff-Serv) architectures were proposed to deliver Quality of Service (QoS) in TCP/IP networks. Network congestion control remains a critical and high priority issue, even for the present Internet architecture. The aim of this paper is to design a robust active queue management system to secure high utilization, bounded delay and loss, while the network complies with the demands each traffic class sets. To this end, variable structure control theory is used and a sliding mode congestion controller is designed. Simulation results of the proposed control action demonstrate the effectiveness of the controller in providing robust queue management system. © Springer-Verlag Berlin Heidelberg 2004.

关键词： controllers

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A scaled feedback stabilization of power integrator triangular systems

A scaled feedback stabilization of power integrator triangul...

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American control Conference (ACC)

作者： D.B. Dacic P.V. Kokotovic Center for Control Engineering and Computation Electrical and Computer Engineering Department University of California슠Santa Barbara Santa Barbara CA USA Center for Control Engineering and Computation Electrical and Computer Engineering Department University of California슠Santa Barbara Santa Barbara CA USA

Using unbounded time-varying scaling of the states we design C/sup 1/ feedback laws for power integrator triangular systems which globally asymptotically stabilize (GAS) the origin despite the uncontrollability of the linearization. With bounded scaling the feedback laws achieve global practical stability (GPS). For a trade-off between GAS/GPS of the origin and unboundedness/boundedness of the scaling we construct a dynamic version of these feedback laws.

关键词： Global Positioning System State feedback Content addressable storage Time varying systems Convergence Stability Backstepping Nonlinear systems Sufficient conditions control engineering

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A new approach to commutation in predictive control of switch reluctance motor

A new approach to commutation in predictive control of switc...

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2004 IEEE International Conference on Industrial Technology, ICIT

作者： Sadeghzadeh, Arash Araabi, Babak N. Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran P.O. Box 14395/515 Tehran Iran

This paper provides a model predictive approach to control switched reluctance motors (SRM's). A local linear neuro-fuzzy model is used to model SRM. Then a predictive control schema is devised considering an appropriate energy term in the optimization phase. Commutation occurs naturally as an outcome of the predictive control design process, not as an extra step added to the control policy. From a computational view point, we use locally linear model predictive control that with a quadratic cost and linear constraints reduces to a simple quadratic program, which can be solved very fast in a closed form. Simulation studies justify applicability of our proposed method to SRM applications. © 2004 IEEE.

关键词： Reluctance motors

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Observer-based model reference sliding-mode control of active suspension systems 6

Observer-based model reference sliding-mode control of activ...

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6th IFAC Symposium on Nonlinear control Systems, NOLCOS 2004

作者： Ashari, Alireza Esna Yazdunpanah, Mohammad Javad Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran P.O. Box: 14395/515 Tehran Iran

In this paper a model reference variable structure controller (VSC) for an active suspension system is designed. A half vehicle model is used in which, the vertical and pitch motions of the mass supported by the suspension and the vertical motion of the suspension masses are considered. Sliding mode controller is applied for the purpose of disturbance attenuation. Unit vector approach, which is a sliding mode control structure for multivariable systems, is used and a robust adaptive nonlinear controller is designed. A reduced-order observer is designed to use only output information. Robust eigenstructure assignment method is implemented in the line of sliding surface design. Simulation results verify the effectiveness of the proposed nonlinear controller scheme in comparison with the passive suspension system and also H∞ technique. The output of the closed-loop system can also smoothly track a set point in a manner that the vertical position of vehicle may be regulated toward the desired point. Copyright © 2004 IF AC.

关键词： Robust control

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Path-following for a class of nonlinear systems with unstable zero dynamics

Path-following for a class of nonlinear systems with unstabl...

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IEEE Conference on Decision and control

作者： D.B. Dacic M.V. Subbotin P.V. Kokotovic Center for Control Engineering and Computation Electrical and Computer Engineering Department University of California슠Santa Barbara Santa Barbara CA USA

In the practical path-following problem formulated in this paper, it is required that the error between the system output and the desired geometric path be less then any prespecified constant. If in a nonlinear MIMO system the output derivatives do not enter the zero dynamics, a geometric condition on the path is given under which a solution to this problem exists. The solution is obtained by combining input-to-state stability and switched-system methodology.

关键词： Nonlinear systems Nonlinear dynamical systems Output feedback Optical character recognition software Sufficient conditions MIMO Stability Humans Linear systems Vectors

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Robust stabilization of discrete-time nonlinear systems by certainty equivalence output feedback with applications to model predictive control

Robust stabilization of discrete-time nonlinear systems by c...

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American control Conference (ACC)

作者： M.J. Messina S.E. Tuna A.R. Teel Center for Control Engineering and Computation Department of Electrical and Computer Engineering University of California Santa Barbara CA USA Mittag-Leffler Institute Sweden

We present robust stability results for discrete-time nonlinear systems using certainty equivalence output feedback, particularly those that employ a model predictive control (MPC) formulation to generate the feedback control law. To this end, we discuss nominal robustness properties of general discrete-time nonlinear systems, including those that use discontinuous control laws in the feedback loop. This is important for systems employing MPC since the method can, and sometimes necessarily does, result in discontinuous control laws. Coupling assumptions of nominal robustness with certain uniform observability or detectability assumptions (for each of which we give an observer), we assert that, in particular, MPC is robustly globally asymptotically stabilizing when used in a certainty equivalence output feedback structure. Finally, we give an example to illuminate our results.

关键词： Robust control Nonlinear systems Output feedback Predictive models Predictive control control systems Robustness Robust stability Feedback control Nonlinear control systems

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