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IEEE Swarm Intelligence Symposium, SIS

作者： Y. Yare G. K. Venayagamoorthy Real-Time and Intelligent Systems Laboratory Department of Electrical and Computer Engineering Missouri University of Science and Technology Rolla MO USA

This paper presents a comparison of a differential evolution (DE) algorithm and a modified discrete particle swarm optimization (MDPSO) algorithm for generating optimal preventive maintenance schedules for economical and reliable operation of a power system, while satisfying system load demand and crew constraints. The DE, an evolutionary technique and an optimization algorithm utilizes the differential information to guide its further search, and can handle mixed integer discrete continuous optimization problems. Discrete particle swarm optimization (DPSO) is known to effectively solve large scale multi-objective optimization problems and has been widely applied in power systems. Both the DE and MDPSO are applied to solve a multi-objective generator maintenance scheduling (GMS) optimization problem. The two algorithms generate feasible and optimal solutions and overcome the limitations of the conventional methods including extensive computational effort, which increases exponentially as the size of the problem increases. The proposed methods are tested, validated and compared on the Nigerian power system.

关键词： Power system reliability Scheduling algorithm Particle swarm optimization Power systems Power generation Preventive maintenance Power system economics Power generation economics Large-scale systems Processor scheduling

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Receive soft antenna selection for spatial-multiplexing MIMO systems in interference-dominated channels

Receive soft antenna selection for spatial-multiplexing MIMO...

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Canadian Conference on electrical and computer engineering (CCECE)

作者： J. Ahmadi-Shokouh S. H. Jamali S. Safavi-Naeini Intelligent Multi-Antenna Radio Systems Laboratory Department of Electrical & Computer Engineering University of Waterloo of Canada Waterloo ONT Canada

In this paper, we find the optimum soft antenna selection (SAS) which maximizes the mutual information for the multiple-input multiple-output (MIMO) spatial multiplexing transmission in an interference channel. In this optimization problem, a 2-Dimensional (2D) directive interference model is used. We first find an optimal solution for SAS without applying any constraint on it and then propose a sub-optimal solution for the case when a phase-shift-only passive linear network (PLN) is used to implement the SAS method. Moreover, we compare the performance of the SAS method with a full-complexity MIMO system in the presence of above modeled interference through a simulation study.

关键词： Receiving antennas MIMO Synthetic aperture sonar Radio frequency Interference channels Transmitting antennas Directive antennas Mutual information Antenna arrays Array signal processing

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On the Optimal Receive Soft Antenna Selection for Reliable Communications in MIMO Interference Channels

On the Optimal Receive Soft Antenna Selection for Reliable C...

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IEEE Conference on Vehicular Technology (VTC)

作者： J. Ahmadi-Shokouh S. H. Jamali S. Safavi-Naeini M. Fakharzadeh Intelligent Multi Antenna Radio Systems (iMARS) Laboratory Department of Electrical & Computer Engineering University of Waterloo Waterloo ONT Canada

A soft antenna selection (SAS) method is basically implemented by a linear network (LN) which is located in RF domain of multiple-input multiple-output (MIMO) systems. In this paper, we find the optimum receiver SAS structure which maximizes the signal to interference-plus-noise ratio (SINR) gain for the diversity transmission in an interference channel. The optimization is applied for two practical cases of transmitters either with or without channel state information. A two-dimensional (2D) directive model is employed to realize the interference effect. A Rician channel model is used for computer simulation. The simulation results show the optimum SAS achieving the performance of the full-complexity MIMO, i.e. a MIMO system with the same number of antenna terminals and RF chains.

关键词： Interference Signal to noise ratio MIMO Synthetic aperture sonar Receiving antennas Gain Receivers

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Sensor diagnostics for autonomous digital structural health monitoring systems

Sensor diagnostics for autonomous digital structural health ...

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26th Conference and Exposition on Structural Dynamics 2008, IMAC-XXVI

作者： Grisso, Benjamin L. Kim, Jina Ha, Dong S. Inman, Daniel J. Center for Intelligent Material Systems and Structures Virginia Polytechnic Institute State University Blacksburg VA 24061 United States Virginia Tech. VLSI for Telecommunications Laboratory Department of Electrical and Computer Engineering Virginia Polytechnic Institute Blacksburg VA 24061-0111 United States

ISBN: (纸本)9781605600666

Previously, hardware has been developed for the impedance-based structural health monitoring technique. This low power health monitoring prototype utilizes a digital signal processor evaluation board to implement a damage detection algorithm. Digital rectangular pulse trains are utilized to excite the structure, and structural response is measured via a digital signal representation. As this scheme for observing structural damage is different from standard impedance measurement methods, the procedure of performing sensor diagnostics will also need to be altered. The research presented in this paper will document efforts to adapt sensor diagnostics for the impedance method to a digital format. Experiments will be used to verify the new sensor diagnostics algorithm, and sensor degradation will be compared with structural deformities.

关键词： Digital signal processors

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CARBON REDUCTION POTENTIAL WITH intelligent CONTROL OF POWER systems

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IFAC Proceedings Volumes 2008年第2期41卷 13952-13957页

作者： Ganesh K. Venayagamoorthy Gabriele Braband Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering Missouri University of Science and Technology Rolla MO 65409 USA Simmons & Simmons Dusseldorf Germany

Climate change caused by anthropogenic greenhouse gas (GHG) emissions such as carbon dioxide (CO 2 ) is now widely accepted as a real condition that has potentially serious consequences for human society and industries need to factor this into their strategic plans. One salient planning assumption is that energy - essential for every activity - will become more expensive relative to other inputs. Economic growth does not have to be linked to an increase of GHG emissions and can be attained in addition to the usage of renewable energy sources by using energy efficiency technologies for power system generation, transmission, and distribution. The development of intelligent energy-efficient control technologies will both soften negative effects of the climate change on the economy and enhance energy security. This paper outlines the significant carbon reduction potential with intelligent control and optimization techniques applied to power system generation and transmission systems with and without wind farms.

关键词： intelligent control Economics Emissions Optimization Power systems

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Telerehabilitation via a mobile robot

Telerehabilitation via a mobile robot

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International Workshop on Virtual Rehabilitation

作者： Daniel Labonte Francois Michaud Richard Cloutier Marc-Andre Roux Dominic Letourneau Michael Lauria Patrick Boissy Department of Electrical Engineering and Computer Engineering Université de Sherbrook QUE Canada Mobile Robotics and Autonomous Intelligent Systems Canada Department of Physical Education Université de Sherbrook QUE Canada

Teleoperated from a distant location, a mobile robot with some autonomous capabilities can become a beneficial tool in telerehabilitation applications. Safety being of prime concern in such settings, we took special care in coming up with the proper teleoperation interfaces that can provide pertinent information about the system states and conditions (objects, persons, free space, data, etc.) in conjunction with an efficient control system. In order to enhancement operatorpsilas performances we tested our new robot with three modalities of visual information presentation in the teleoperation interfaces, with the use of virtual reality for operator interfaces, in a setup reproducing home like environment.

关键词： Robots Mobile communication Virtual reality Mobile robots Medical services Solid modeling Context modeling

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Switch loss and antenna directivity effects on MIMO antenna selection

Switch loss and antenna directivity effects on MIMO antenna ...

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Canadian Conference on electrical and computer engineering (CCECE)

作者： J. Ahmadi-Shokouh S. H. Jamali S. Safavi-Naeini G. Z. Rafi Intelligent Multi-Antenna Radio Systems (iMARS) Laboratory Department of Electrical & Computer Engineering University of Waterloo of Canada Waterloo ONT Canada

In this paper, we study the effect of antenna directivity on multi-input-multi-output (MIMO) antenna selection. A 4 orthogonal pattern antenna array platform at the receiver side associated with an antenna selection mechanism is used in this study. The performance of the proposed method is evaluated for two cases where the antenna selection switches are located either after or before Low Noise Amplifiers (LNA), on a MIMO system under the diversity transmission. The results show how the antenna directivity and switch loss can affect the overall MIMO system performance.

关键词： Switches MIMO Directive antennas Microstrip antenna arrays Antenna arrays Receiving antennas Diversity methods Radio frequency Microstrip antennas Array signal processing

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State feedback controller design of networked control systems with time delay and packet dropout

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IFAC Proceedings Volumes 2008年第2期41卷 6626-6631页

作者： Hongbo Li Zengqi Sun Mo-Yuen Chow Badong Chen Department of Computer Science and Technology State Key Laboratory of Intelligent Technology and Systems Tsinghua University Beijing China 100084 Department of Electrical and Computer Engineering North Carolina State University Raleigh NC 27695-7911 USA

In this paper, the stability analysis and synthesis problems for networked control systems (NCSs) are investigated. By introducing the lifting technique into NCSs, a novel discrete-time switch model is proposed with the consideration of time delay and packet dropout during the transmission of packets. It describes NCSs as a switch system, and therefore enables us to apply the theory from switch systems to study NCSs in discrete-time domain. In terms of the given model, we give sufficient conditions for the existence of state feedback controller such that the closed-loop NCSs are asymptotically stable. Based on the obtained stability conditions, a homotopy-based iterative LMI algorithm is developed to get the state feedback gain. Simulation results are given to demonstrate the effectiveness of the proposed approaches.

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A simple state feedback controller design method of networked control systems with time delay and packet dropout

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IFAC Proceedings Volumes 2008年第2期41卷 12575-12580页

This paper presents a simple yet effective method to design state feedback controller for networked control systems (NCSs). By introducing the lifting technique into NCSs and by considering the balance between effectiveness and simplicity, a novel discrete-time switch model is proposed with the consideration of time delay and packet dropout during the transmission of packets. In terms of the given model, we give sufficient conditions for the existence of state feedback controller such that the closed-loop NCSs are asymptotically stable. Based on the obtained stability conditions, a homotopy-based iterative LMI algorithm is developed to get the state feedback gain. Simulation and experimental results are given to demonstrate the effectiveness of the proposed approaches.

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Admittance control of a human centered 3 DOF robotic arm using Differential Elastic Actuators

Admittance control of a human centered 3 DOF robotic arm usi...

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2008 IEEE/RSJ International Conference on intelligent Robots and systems

作者： M.-A. Legault M.-A. Lavoie F. Cabana Ph. Jacob-Goudreau D. Letourneau F. Michaud M. Lauria Department of Electrical Engineering & Computer Engineering Université de Sherbrook QUE Canada Department of Chirurgy Université de Sherbrook QUE Canada Mobile Robotics and Autonomous Intelligent Systems Electrical Engineering and Computer Engineering Canada Research Chair Université de Sherbrook QUE Canada Department of Electrical Engineering and Computer Engineering Université de Sherbrook QUE Canada

ISBN: (纸本)9781424420575

This video shows the functionalities of a 3 serial DOF robotic arm. Each DOF is actuated with a patent pending differential elastic actuator (DEA) [1,2]. Compared to the abundantly studied series elastic actuator [3,4], DEA uses a differential coupling between a high impedance mechanical speed source and a low impedance mechanical spring. Possible implementations of a mechanical differential include the use of a standard gearbox, harmonic drive, cycloidal gearbox, bar mechanism, cable mechanism and all other mechanism that implement a differential function between three mechanical ports. For the implementation reported in this video, we used a harmonic drive for a very compact design. A passive torsion spring (thus the name elastic), with a known impedance characteristic corresponding to the spring stiffness, is used, with an electrical DC brushless motor. A non-turning sensor connected in series with the spring measures the torque output of the actuator.

关键词： Actuators Robots Springs Impedance Admittance Trajectory Robot sensing systems

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