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Quantitative InfraRed Thermography Journal 2004年第1期1卷 47-70页

作者： Ibarra-Castanedo, Clemente Maldague, Xavier Computer Vision and Systems Laboratory Dept. Of Electrical and Computer Engineering Université Laval Quebec City QC G1K7P4 Canada

Pulsed Phase Thermography has considerably evolved since it was originally introduced in 1996. In this paper, a general review of the technique is presented. The different types of uncertainties related to data acquisition and processing are identified. Equivalence between discrete and continuous Fourier Transforms when applied to thermographic data is discussed in detail. As will be pointed out, the optimal solution for a Pulsed Phase problem, qualitative or quantitative, arises from a compromise between sampling rate, truncation window size and the available computer power. The theoretical concepts introduced here are reinforced with a variety of experimental results. © 2004 Taylor & Francis Group, LLC.

关键词： Aliasing Inversion Techniques Leakage Pulsed Phase Thermography Sampling Truncation

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Glitching power reduction through supply voltage adaptation mechanism for low power array structure design

Glitching power reduction through supply voltage adaptation ...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Sangjin Hong Shu-Shin Chin M. Sadasivam Mobile Systems Design Laboratory Department of Electrical and Computer Engineering Stony Brook University-SUNY Stony Brook NY USA

A novel supply voltage switching mechanism for reducing power dissipation of array structures is presented. With this mechanism, the supply voltage levels are successively activated by external clock signal in the direction of signal propagation. The mechanism eliminates power dissipated by the glitches while the speed of the array structure can be maintained. The mechanism is easily incorporated so that no circuit change in the existing array structure is required.

关键词： Power supplies Voltage Adaptive arrays Logic Switches Power dissipation Pipelines Registers Delay Clocks

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Digital PI fuzzy control strategies applied to an electric microgenerator system

Digital PI fuzzy control strategies applied to an electric m...

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IEEE/PES Transmission and Distribution Conference and Exposition: Latin America

作者： B.M. Campos C.T. da Costa W. Barra K.C.F. da Silva J.A.L. Barreiros Laboratory of Control and Systems (LACOS) Technological Center Electrical and Computer Engineering Department Federal University of Para Belem Para Brazil

This paper investigates digital modeling and control strategies applied to the voltage regulation of a microgenerator system, placed in the Electric Energy Generation laboratory of Federal University of Para. Identification parametric techniques are used in order to obtain a representative model for the controller design. With a suitable model, controllers of proportional integral type are designed, based on the root locus and fuzzy systems strategies, in order to improve the voltage regulation of the microgenerator system.

关键词： Fuzzy control Voltage control Digital control Proportional control Fuzzy logic Regulators Control systems DC motors Velocity control Laboratories

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Fault detection and identification for robot manipulators

Fault detection and identification for robot manipulators

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IEEE International Conference on Robotics and Automation (ICRA)

作者： M.L. McIntyre W.E. Dixon D.M. Dawson I.D. Walker Department of Electrical & Computer Engineering Clemson University Clemson SC USA Robotics and Energetic Systems Group Oak Ridge National Laboratory Oak Ridge TN USA Department of Electrical & Computer Engineering Clemson University Clemson SC

Several factors must be considered for robotic task execution in the presence of a fault, including: detection, identification, and accommodation for the fault. In this paper, a prediction error based dead-zone residual function and nonlinear observers are used to detect and identify a class of actuator faults. Advantages of the proposed fault detection and identification methods are that they are based on the nonlinear dynamic model of a robot manipulator (and hence, can be extended to a number of general Euler Lagrange systems), they do not require acceleration measurements, and they are independent from the controller. A Lyapunov-based analysis is provided to prove that the developed fault observer converges to the actual fault.

关键词： Fault detection Fault diagnosis Robots Manipulator dynamics Accelerometers Medical robotics Acceleration electrical fault detection US department of Energy Contracts

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Localization of simultaneous moving sound sources for mobile robot using a frequency- domain steered beamformer approach

Localization of simultaneous moving sound sources for mobile...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： J.-M. Valin F. Michaud B. Hadjou J. Rouat LABORIUS-Research Laboratory on Mobile Robotics and Intelligent Systems Department of Electrical Engineering and Computer Engineering Université de Sherbrook Sherbrooke QUE Canada

Mobile robots in real-life settings would benefit from being able to localize sound sources. Such a capability can nicely complement vision to help localize a person or an interesting event in the environment, and also to provide enhanced processing for other capabilities such as speech recognition. We present a robust sound source localization method in three-dimensional space using an array of 8 microphones. The method is based on a frequency-domain implementation of a steered beamformer along with a probabilistic post-processor. Results show that a mobile robot can localize in real time multiple moving sources of different types over a range of 5 meters with a response time of 200 ms.

关键词： Mobile robots Auditory system Orbital robotics Intelligent robots Head Acoustic noise Humans Robustness Microphone arrays Signal processing

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Enhanced robot audition based on microphone array source separation with post-filter

Enhanced robot audition based on microphone array source sep...

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IEEE International Workshop on Intelligent Robots and systems (IROS)

作者： J.-M. Valin J. Rouat F. Michaud Department of Electrical Engineering and Computer Engineering LABORIUS-Research Laboratory on Mobile Robotics and Intelligent Systems Université de Sherbrook Sherbrooke QUE Canada

We propose a system that gives a mobile robot the ability to separate simultaneous sound sources. A microphone array is used along with a real-time dedicated implementation of geometric source separation and a post-filter that gives us a further reduction of interferences from other sources. We present results and comparisons for separation of multiple non-stationary speech sources combined with noise sources. The main advantage of our approach for mobile robots resides in the fact that both the frequency domain geometric source separation algorithm and the post-filter are able to adapt rapidly to new sources and non-stationarity. Separation results are presented for three simultaneous interfering speakers in the presence of noise. A reduction of log spectral distortion (LSD) and increase of signal-to-noise ratio (SNR) of approximately 10 dB and 14 dB are observed.

关键词： Microphone arrays Source separation Mobile robots Acoustic noise Auditory system Humans Intelligent robots Interference Robot sensing systems Mobile computing

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Trajectory interpolation for parametrized maneuvering and flexible motion planning of autonomous vehicles

Trajectory interpolation for parametrized maneuvering and fl...

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Collection of Technical Papers - AIAA Guidance, Navigation, and Control Conference

作者： Dever, Chris Mettler, Bernard Feron, Eric Popović, Jovan McConley, Marc Massachusetts Institute of Technology Cambridge MA 02139 United States Department of Mechanical Engineering MIT Charles Stark Draper Laboratory 555 Technology Square Cambridge MA 02139 United States Laboratory for Information and Decision Systems Department of Aeronautics and Astronautics Massachusetts Institute of Technology Cambridge MA 02139 United States Laboratory for Information and Decision Systems Massachusetts Institute of Technology Cambridge MA 02139 United States Department of Electrical Engineering and Computer Science Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology Cambridge MA 02139 United States Charles Stark Draper Laboratory 555 Technology Square Cambridge MA 02139 United States

ISBN: (纸本)1563476703

This paper describes a method of generating continuously parametrized maneuver classes based on a finite number of user-provided examples motions. A trajectory interpolation algorithm performs a smooth transformation of vehicle maneuvers across a continuous range of boundary conditions while enforcing nonlinear system equations of motion as well as non-linear equality and inequality constraints. The scheme is particularly useful for describing motions that deviate widely from the range of linearized dynamics and where satisfactory examples may be found from off-line nonlinear programming solutions or human pilot motion capture. The interpolation algorithm is computationally efficient, making it a suitable alternative for near real-time maneuver synthesis, particularly when used in concert with a vehicle motion planner. Experimental application to a three degree-of-freedom rotorcraft test bed demonstrates the essential features of system and trajectory modeling, maneuver example selection, maneuver class synthesis, and integration into a hybrid system path planner. Copyright © 2004 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Aircraft

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Physical modeling of electric machines for motor drive system simulation

Physical modeling of electric machines for motor drive syste...

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IEEE PES Power systems Conference and Exposition, PSCE

作者： O.A. Mohammed S. Liu Z. Liu Department of Electrical and Computer Engineering Energy Systems Laboratory Florida International University Miami FL USA Energy Systems Laboratory Florida International University Miami FL USA

This paper discusses the issues related to the physical modeling of electric machines. The concept of physical modeling is introduced through reviewing the assumptions made in ideal models. In addition to the FE models, a physical phase variable model is proposed. The inductances as well as flux linkages are calculated from nonlinear transient FE solutions. Simulink implementations of both FE model and the phase variable model are studied. A PM synchronous motor and a PM brushless motor are used as objects of this research. The physical models of them are built and applied to various motor drive simulation systems. The obtained results show the ability of physical modeling in obtaining accurate results at much more faster speed.

关键词： Electric machines Motor drives Equations Iron Inductance Couplings Synchronous motors Transient analysis Rotors Torque

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Laser imaging through scattering media

Laser imaging through scattering media

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IEEE Instrumentation and Measurement Technology Conference

作者： G.C. Giakos A. Molhokar A. Orozco V. Kumar S. Sumrain D. Mehta A. Maniyedath N. Ojha A. Medithe Department of Electrical and Computer Engineering Imaging Systems Sensors and Photonics Laboratory University of Akron Akron OH USA Department of Biomedical Engineering Imaging Systems Sensors and Photonics Laboratory University of Akron Akron OH USA

In this contribution, new paradigms of laser interaction and imaging through scattering media are presented. Specifically, the imaging potential of efficient optical polarimetric techniques, for active imaging through scattering media has been studied. The depolarization of backscattered polarized laser light, based on the Mueller-matrices formalism, has been investigated. The experimental results indicates clearly that, scattered photons from disperse media maintain a high degree of polarization. As a result, image quality and target recognition can be improved significantly.

关键词： Optical scattering Light scattering Particle scattering Optical polarization Optical imaging Biomedical optical imaging Biological tissues Biomedical imaging Imaging phantoms Optical sensors

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Vertical integration of enterprise industrial systems utilizing Web services

Vertical integration of enterprise industrial systems utiliz...

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IEEE International Workshop on Factory Communication systems (WFCS)

作者： A.P. Kalogeras J. Gialelis C. Alexakos M. Georgoudakis S. Koubias Industrial Systems Institute Rio-Patras Greece Applied Electronics Laboratory Department of Electrical and Computer Engineering University of Patras Rio-Patras Greece

The need for interoperability is prominent in the industrial enterprise environment. Different applications and systems that cover the overall range of the industrial infrastructure from the field to the enterprise level need to interoperate. This quest is driven by the enterprise need for greater flexibility and for the wider possible integration of the enterprise systems. The current paper presents an architecture that utilizes three predominant state-of-the-art technologies, namely workflows, ontologies and Web services in order to address the above quest in an efficient way.

关键词： Web services Manufacturing industries electrical equipment industry Service oriented architecture Ontologies Industrial control computer industry Electronics industry Paper technology systems engineering and theory

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