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Delay-dependent robust stability and H/sub /spl infin// control for jump linear systems with delays

Delay-dependent robust stability and H/sub /spl infin// cont...

引用

American control Conference (ACC)

作者： Jing Wu Tongwen Chen Long Wang Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada Center for Systems and Control Department of Mechanics and Engineering ScienceFirst Hospital Peking University Beijing China

ISBN: (纸本)0780390989

This paper considers robust stochastic stability, stabilization and H/sub /spl infin// control problems for a class of jump linear systems with time delays. By taking some zero equations, neither model transformation nor bounding for cross terms is required to obtain the delay-dependent results, which are given in terms of linear matrix inequalities (LMIs). Maximum sizes of time delays are also studied for system stability. Furthermore, solvability conditions and corresponding H/sub /spl infin// control laws are given which provide robust stabilization with a prescribed H/sub /spl infin// disturbance attenuation level /spl gamma/. Numerical examples show that our proposed methods are much less conservative than existing results.

关键词： Robust stability control systems Linear systems Delay systems Delay lines Delay effects Equations Stability analysis control system synthesis Robust control

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Fuzzy sliding mode control applied to low noise switched reluctance motor control

Fuzzy sliding mode control applied to low noise switched rel...

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International Conference on control and Automation (ICCA)

作者： H. Rouhani C. Lucas R.M. Milasi M.N. Bahrami Iranian Applied Design Center of Excellence Mechanical Engineering Department University of Tehran Tehran Iran Iranian Control & Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Iran

In this paper, fuzzy sliding mode controller is designed to govern the dynamics of switched reluctance motor. First, magnetic characteristics data of the motor obtained by finite element method (FEM) is utilized for a fuzzy estimation. Next, fuzzy sliding mode control approach has been utilized as a nonlinear robust control algorithm to deal with a highly nonlinear system with an unknown model and a variable load torque. Simulation results show an excellent tackling the problem with an acceptable control effort. Finally, an effective commutation algorithm has been coupled with the proposed controller which can reduce the acoustic noise resources.

关键词： Sliding mode control Fuzzy control Reluctance motors Magnetic noise Nonlinear dynamical systems Finite element methods Fuzzy systems Robust control Nonlinear systems Commutation

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Improving CFAR detection through adaptive determination of reference window extents

Improving CFAR detection through adaptive determination of r...

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OCEANS

作者： A. Sarma D.W. Tufts Autonomous Systems and Technology Department Naval Undersea Warfare Center Newport RI USA Department of Electrical and Computer Engineering University of Rhode Island Kingston RI USA

Adaptive constant false alarm rate (CFAR) detectors operating on envelope-squared matched-filtered beam data generally employ two equal fixed-length windows, straddling the test cell, to collect reference samples. Our objective is to prevent the consideration of reference sample sets that do not behave even approximately i.i.d. A procedure to adaptively determine window sizes is presented. The nested hypothesis testing procedure is based on the principles of quality control and utilizes the Mann-Kendall rank test for randomness. Potential benefits include improved false alarm control, increased detection probability and closer tracking of extended clutter edges

关键词： Envelope detectors Noise level System testing Quality control Radar detection Radar tracking Clutter Surveillance Sonar Statistics

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Adaptive output-feedback for nonlinear systems with no a priori bounds on parameters

Adaptive output-feedback for nonlinear systems with no a pri...

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American control Conference (ACC)

作者： P. Krishnamurthy F. Khorrami Control/Robotics Research Laboratory(CRRL) Department of Electrical and Computer Engineering Six Metrotech Center Polytechnic University Brooklyn NY USA

In a result by P. Krishnamurthy and F. Khorrami (2004), we proposed a dynamic high-gain observer/controller architecture for nonlinear systems of the generalized output-feedback canonical form. The design of P. Krishnamurthy and F. Khorrami (2004) utilized the dual architecture of a high-gain observer and controller and incorporated a single dynamic scaling. The designed output-feedback controller was shown to be robust to functional and parametric uncertainties coupled with all states. However, a magnitude bound on the unknown parameters was required. In this paper, we propose a time-varying output-feedback controller that can handle time-varying nonlinear parametric uncertainty coupled with all states without requiring any a priori magnitude bounds on the unknown parameters. This is achieved using a novel time-varying dynamics of the high-gain scaling parameter. The proposed observer/controller structure provides a globally asymptotically stabilizing output-feedback solution for the benchmark open problem proposed in our earlier work with no magnitude bounds or sign information on the unknown parameter being necessary.

关键词： Nonlinear systems control systems Observers Uncertainty Riccati equations Lyapunov method Nonlinear control systems Robust control Couplings Programmable control

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Generalized state scaling-based robust control of nonlinear systems and applications to triangular systems

Generalized state scaling-based robust control of nonlinear ...

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American control Conference (ACC)

作者： P. Krishnamurthy F. Khorrami Control/Robotics Research Laboratory(CRRL) Department of Electrical and Computer Engineering Six Metrotech Center Polytechnic University Brooklyn NY USA

In this paper, we propose a high-gain scaling based controller to achieve global state-feedback stabilization of a general class of nonlinear systems which are allowed to contain uncertain functions of all the states and the control input as long as polynomial bounds on ratios of some uncertain system terms are available. The design is based on a high-gain scaling involving appropriate powers of a high-gain scaling parameter which is a dynamic signal driven by the state. The designed controller has a very simple structure being essentially a dynamic extension and a linear feedback with state-dependent dynamic gains. The obtained results are applicable to both lower triangular (strict-feedback) and upper triangular (feedforward) structures and also to systems without any triangular structure as long as a set of inequalities involving powers of the polynomial bounds on the ratios of the uncertain system terms and scaling orders is solvable. The stability analysis is based on our recent results on uniform solvability of coupled state-dependent Lyapunov equations.

关键词： Robust control Nonlinear systems Nonlinear control systems control systems Polynomials Uncertain systems Signal design Nonlinear dynamical systems Linear feedback control systems State feedback

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GODZILA: a low-resource algorithm for path planning in unknown environments

GODZILA: a low-resource algorithm for path planning in unkno...

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American control Conference (ACC)

作者： P. Krishnamurthy F. Khorrami Control/Robotics Research Laboratory(CRRL) Department of Electrical and Computer Engineering Six Metrotech Center Polytechnic University Brooklyn NY USA

In this paper, we propose a novel path-planning and obstacle avoidance algorithm GODZILA for navigation in unknown environments. No prior knowledge of the environment is required. The path-planning algorithm follows a purely local approach using only the current range sensor measurements at each sampling instant and requiring only a small number of stored variables in memory. No map of the environment is built during navigation. This minimizes the memory and computational requirements for implementation of the algorithm, a feature that is especially attractive for small autonomous vehicles. The algorithm utilizes three components: an optimization algorithm, a local straight-line path planner to visible targets, and random navigation. It is proved, for navigation in any finite-dimensional space, that the path-planning algorithm converges in finite time with probability 1. The performance of the algorithm is demonstrated through simulations for path-planning in two-dimensional and three-dimensional spaces. It is seen that a relatively small number of range sensor measurements is sufficient even in complex unknown environments.

关键词： Path planning Navigation Remotely operated vehicles Mobile robots Current measurement Sampling methods Cost function Trajectory Robot sensing systems Orbital robotics

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A new protection scheme for fault location and relay by matrix operation method in transmission lines

A new protection scheme for fault location and relay by matr...

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2005 IEEE/PES Transmission and DistributionConference and Exhibition - Asia and Pacific

作者： Zuo, X.F. Kuribayashi, H. Inagaki, T. Tsuji, K. Hiyama, T. IEEE Development Center Marketing and Engineering Division Kyuki Co. Fukuoka 815-0031 Japan Toyama East Synthesis Control Station Hokuriku Electric Power Co. Toyama 930-8543 Japan Techno Tsuji Ltd. Toyama 939-8136 Japan Department of Electrical and Computer Engineering Kumamoto University Kumamoto 860-8555 Japan

ISBN: (纸本)0780391144

This paper presents additional functions of the newly developed matrix operation type protection relay in power transmission lines. The paper presents the basic principle of fault location, the function of integrated protection, corresponding of the system configuration, the regular surveillance, and the results of simulation test. The general equations, which are utilized for the fault detection and the fault location, are derived from the basic equations based on the principle of Kirchhoff s first and second laws for the study transmission system. The proposed protection relay, differing from the conventional digital ones, enable to generalize the required protection functions such as the grounding fault protection, the short-circuit fault protection, the main and the backup protection based on a equivalent circuit for the study system. The function of regular surveillance can be realized to satisfy the voltage balance calculated by the off-line constants and the estimated on-line parameters synthetically. It ensures effectively the reliability of the proposed protection system. The new functions are developed naturally from the principles of the matrix operation type protection relay. Simulation studies and laboratory experiments have clarified the fact that the proposed protection scheme provides an innovative way to solve many problems still remained. © 2005 IEEE.

关键词： Electric power system protection

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Distributed sensor networks based on mobile agents paradigm

Distributed sensor networks based on mobile agents paradigm

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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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Adaptive output feedback design for actuator failure compensation using dynamic bounding: output tracking and an application

Adaptive output feedback design for actuator failure compens...

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American control Conference (ACC)

作者： Xidong Tang Gang Tao S.M. Joshi Department of Electrical and Computer Engineering University of Virginia Charlottesville VA USA Mail Stop 132 NASA-Langley Research Center Hampton VA USA

A new adaptive output feedback design using dynamic bounding is presented for actuator failure compensation of a class of nonlinear systems with unknown nonlinearities bounded by output-dependent functions and dynamic signals. The new features are that desired objectives can be achieved via a Lyapunov based design without using high gain type controllers and that it handles a larger class of systems. An adaptive scheme dealing with unknown actuator failures as well as system uncertainties is developed to achieve desired output tracking and closed-loop stability in spite of actuator failures.

关键词： Output feedback Actuators control systems Nonlinear systems Adaptive control Stability Nonlinear control systems Application software nasa Signal design

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On consistency of stochastic gradient algorithms for ARMAX models with disturbances

On consistency of stochastic gradient algorithms for ARMAX m...

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American control Conference (ACC)

作者： Feng Ding Tongwen Chen Research Associate University of Alberta Edmonton Canada Control Science and Engineering Research Center Southern Yangtze University Wuxi China Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada

ISBN: (纸本)0780390989

In this paper, we give a new method to prove in detail the consistency of the residual based and innovation based stochastic gradient algorithms for identifying CARMA/ARMAX models with disturbances under weaker conditions on statistical properties of the noise, e.g., the mean value is non-zero, and the variance is time-varying, and/or high-order moments are possibly nonexistent. The analysis indicates that the parameter estimation error is consistently bounded, and consistently converges to zero under persistent excitation conditions.

关键词： Stochastic processes Stochastic resonance Parameter estimation Convergence Adaptive control Differential equations Technological innovation Least squares approximation Algorithm design and analysis Least squares methods

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