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Robust H/spl infin/ filter design for uncertain linear systems with multiple time-varying state delays

IEEE Transactions on Signal Processing 2001年第3期49卷 569-576页

作者： C.E. de Souza R. Martinez Palhares P.L. Dias Peres Department of Systems and Control Laboratorio Nacional de Computacao Cientifica Petropolis Brazil Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Belo Horizonte Brazil School of Electrical and Computer Engineering State University of Campinas-UNICAMP Campinas Brazil

The problem of robust H/spl infin/ filtering for continuous-time uncertain linear systems with multiple time-varying delays in the state variables is investigated. The uncertain parameters are supposed to belong to a given convex bounded polyhedral domain. The aim is to design a stable linear filter assuring asymptotic stability and a prescribed H/spl infin/ performance level for the filtering error system, irrespective of the uncertainties and the time delays. Sufficient conditions for the existence of such a filter are established in terms of linear matrix inequalities, which can be efficiently solved by means of powerful convex programming tools with global convergence assured. An example illustrates the proposed methodology.

关键词： Robustness Nonlinear filters Linear systems Filtering Time varying systems Asymptotic stability Uncertainty Delay effects Sufficient conditions Linear matrix inequalities

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A magnetically damped momentum transfer device to reduce chatter in a micro-mechanical switch

A magnetically damped momentum transfer device to reduce cha...

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IEEE International Conference on Micro Electro Mechanical Systems

作者： B. Chaudhuri K. Fischer H. Guckel Materials Science Program University of Wisconsin Madison WI USA Department of Electrical and Computer Engineering University of Wisconsin Madison WI USA

ISBN: (纸本)0780359984

A micro-mechanical switch has been designed and fabricated in which the bounce after contact closure has been reduced by using mechanical momentum transfer and magnetic damping, while maintaining high contact forces. The period of chatter has been reduced from 1.5 milliseconds to less than 0.3 milliseconds, while the switching speed is 5 millisecond. The switch has been fabricated using Permalloy (78% Ni and 22% Fe) and copper. The LIGA process was used in the fabrication of the switch. An improved copper process allowed the fabrication of high aspect ratio (20:1) structures which were subsequently freed and assembled.

关键词： Magnetic devices Magnetic moments Switches Contacts Copper Fabrication Magnetic switching Damping Iron Assembly

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Theory of impact ionization in thin multiplication layers

Theory of impact ionization in thin multiplication layers

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IEEE Photonics Conference (IPC)

作者： M.M. Hayat Oh-Hyun Kwon M.A. Saleh Department of Electrical and Computer Engineering University of New Mexico Albuquerque NM USA Electro-optics Program University of Dayton Dayton OH USA

We use a model for the ionization coefficients to calculate the frequency response characteristics and the avalanche breakdown voltage in thin layers. Notably, calculations based on the dead-space theory for the APD time response reveal that in addition to a reduction in the excess noise factor, thin layers benefit from reduced spectral fluctuations in the buildup-time limited photocurrent.

关键词： Impact ionization Space exploration Fluctuations Predictive models Noise reduction Gain measurement Frequency response Time factors Photoconductivity Bandwidth

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Design of gyroscope-free navigation systems

Design of gyroscope-free navigation systems

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International Conference on Intelligent Transportation

作者： Chin-Woo Tan S. Park K. Mostov P. Varaiya Partners for Advanced Transit and Highways PATH Program University of California Berkeley USA Department of Electrical Engineering and Computer Science University of California Berkeley USA

We examine the feasibility of designing a gyroscope-free inertial navigation system (INS) that uses only accelerometers to compute the linear and angular motions of a rigid body. The accelerometer output equation is derived to relate the linear and angular motions of a rigid body relative to a fixed inertial frame. A sufficient condition is given to determine if a configuration of accelerometers is feasible. If the condition is satisfied, the angular and linear motions can be computed separately using two decoupled equations of an input-output (I/O) dynamical system; a state equation for angular velocity and an output equation for linear acceleration. This simple computation scheme is derived from the corresponding dynamical system equations for a special cube configuration for which the angular acceleration is expressed as a linear combination of the accelerometer outputs.

关键词： Gyroscopes Accelerometers Equations Acceleration Inertial navigation Angular velocity Sufficient conditions Aircraft navigation Rotation measurement Automobiles

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Dynamics and control of multi-converter DC power electronic systems

Dynamics and control of multi-converter DC power electronic ...

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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： A. Emadi A. Ehsani Power Electronics and Motor Drives Laboratory Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA Advanced Vehicle Systems Research Program Department of Electrical Engineering Texas A and M University College Station TX USA

In multi-converter power electronic systems, different power electronic converters are integrated together to form a complex and extensively interconnected system. In general, there are two kinds of loads in these systems. One group is conventional loads, which have positive incremental impedance characteristics. They are mainly considered as constant voltage loads that require regulated voltage for their operation. The other group is tightly regulated power electronic converters and motor drives sinking constant power from their input buses. The purpose of this paper is to present an assessment of the dynamic interactions between these loads in the multi-converter DC power electronic systems. Furthermore, a nonlinear robust stabilizing controller based on the feedback linearization technique for DC/DC PWM converters is presented.

关键词： Control systems Power electronics Voltage Interconnected systems Impedance Motor drives Robust control Linear feedback control systems Linearization techniques Pulse width modulation converters

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Multi-converter power electronic systems: definition and applications

Multi-converter power electronic systems: definition and app...

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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： A. Emadi M. Ehsani Power Electronics and Motor Drives Laboratory Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA Department of Electrical Engineering Advanced Vehicle Systems Research Program Texas A and M University College Station TX USA

In multi-converter power electronic systems, different converters such as DC/DC choppers, DC/AC inverters, and AC/DC rectifiers are used in source, load, and distribution subsystems to provide power at different voltage levels and forms. Most of the loads are also in the form of power electronic converters and motor drives. The most popular examples of these systems are automotive systems and more electric/hybrid electric vehicles. These systems have unique characteristics, dynamics, and stability problems that are just beginning to be appreciated. In this paper, we take a closer look at multiconverter power electronic systems and address the fundamental problems faced in these systems.

关键词： Power electronics Analog-digital conversion Choppers Inverters Rectifiers Voltage Motor drives Automotive engineering Hybrid electric vehicles Vehicle dynamics

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Robust H∞ control for uncertain state-delayed linear systems with Markovian jumping parameters 6

Robust H∞ control for uncertain state-delayed linear system...

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6th European Control Conference, ECC 2001

作者： Palhares, R.M. De Souza, C.E. Peres, P.L.D. Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Av. Dom José Gaspar 500 Prédio 4 Belo Horizonte MG30535-610 Brazil Department of Systems and Control Laboratório Nacional de Computação Científica - LNCC Av. Getúlio Vargas 333 Petrópolis RJ25651-070 Brazil School of Electrical and Computer Engineering University of Campinas CP 6101 Campinas SP13081-970 Brazil

ISBN: (纸本)9783952417362

The problem of robust H∞ state-feedback control design for a class of continuous-time linear systems with Markovian jumping parameters and multiple time-varying delays at the states, and subject to uncertain parameters is addressed in this paper. It is assumed that the jumping parameters are available and the uncertain parameter belong to given convex bounded domains (polytope type uncertainty). A delay-independent sufficient condition assuring robust mean square stability and a prescribed level of H∞ disturbance attenuation for the closed-loop system is established in terms of linear matrix inequalities. © 2001 EUCA.

关键词： Linear matrix inequalities

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Segmentation and analysis of leg ulcers color images

Segmentation and analysis of leg ulcers color images

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International Workshop on Medical Imaging and Augmented Reality

作者： A.A. Perez A. Gonzaga J.M. Alves Computer Vision Laboratory Department of Electrical Engineering School of Engineering of São Carlos University of São Paulo Sao Paulo Brazil Department of Materials Aeronautic and Automotive Engineering School of Engineering of São Carlos University of São Paulo Bioengineering Graduate Program Sao Paulo Brazil

ISBN: (纸本)0769511139

This paper presents a methodology for the segmentation and analysis of the tissues in color images of leg ulcers. The segmentation is obtained through an automatic analysis made in the RGB and SI channels by changing from the RGB color space to the HSI color space. The aim is to determine which of the five channels have the characteristic that will make the segmentation process more efficient. After the analysis, the selected channel is segmented and used as a mask over the original image, allowing that only the inner tissues of the wound be analyzed. The analysis is done through predetermined functions that attribute membership grade for each processed pixel as well as its level of engagement in a specified tissue class. The article also shows the results obtained from both the segmentation and analysis of tissues using the proposed method.

关键词： Image segmentation Image analysis Image color analysis Leg Wounds Cameras Automotive engineering Colored noise Monitoring Video compression

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Zone-branch reliability methodology applied to Gold Book standard network

Zone-branch reliability methodology applied to Gold Book sta...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： D.O. Koval L. Jiao R.G. Arno P.S. Hale Department of Electrical & Computer Engineering University of Alberta Edmonton AB Canada Special Missions Office Power Reliability Enhancement Program (PREP) U.S. Army Corps of Engineers Fort Belvoir VA USA

There is a need recognized in the power industry to identify and utilize a standard tool or a set of tools to analyze the reliability of industrial and commercial power systems. Historically, the reliability results of different reliability methodologies varied significantly and comparisons were extremely difficult, The Reliability Analysis Technique Working Group of Gold Book (i.e., IEEE Std. 493) developed a standard network to enable comparison of analytical techniques. This paper identifies the different analysis techniques available. This paper is the second of a series of papers applying the zone-branch methodology to the Gold Book standard network configuration. Two case studies are presented for different network operating practices. Future papers applying these different techniques to the same Gold Book standard network configuration are presented and the results compared to determine accuracy of these analytical techniques.

关键词： Gold Books Power system reliability computer network reliability Reliability engineering Power engineering and energy Industrial power systems Power cables Availability Frequency estimation

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Analysis techniques for electrical and mechanical power systems

Analysis techniques for electrical and mechanical power syst...

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Annual Meeting Industrial and Commercial Power Systems Technical Conference

作者： P.S. Hale R.G. Arno D.O. Koval Special Missions of fice U. S. Army Corps of Engineers Power Reliability Enhancement Program Fort Belvoir VA USA Reliability Analysis Center Rome NY USA Department of Electrical and Computer Engineering University of Alberta Edmonton AB Canada

This paper is the first of a series of papers discussing the application and accuracy of different analysis techniques supporting the determination of system availability. This paper identifies and discusses the different analysis techniques currently available and identifies software tools utilizing these techniques. It discusses the fundamental approaches of each tool. There is a need recognized in the power industry to identify and utilize a standard tool to analyze the availability of facilities utilizing electrical, mechanical, and HVAC systems. This paper is the culmination of a 6-month study designed to identify viable analysis techniques and associated software tools available for the application of the techniques. The different approaches discussed in this paper include: Boolean algebra; reliability block diagram; event tree; Monte Carlo; zone branch; FMECA; and cut set.

关键词： Power system analysis computing Power system reliability Availability Software tools Power system modeling Reliability engineering Power engineering and energy Application software Frequency estimation Maintenance

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