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APPLICATION OF COMPUTATIONAL FLUID-DYNAMICS TOOLS TO CIRCUIT-BREAKER FLOW-ANALYSIS

IEEE TRANSACTIONS ON POWER deLIVERY 1995年第2期10卷 817-823页

作者： TREPANIER, JY ZHANG, XD PELLEGRIN, H CAMARERO, R Department of Mechanical Engineering Ecole Polytechnique de Montrèal Montreal QUE Canada Polytechnique Montreal Montreal QC CA Dept. of Mech. Eng. Ecole Polytech. de Montreal Que. Canada

This paper presents the results of the application of a computational fluid dynamics computer program to the simulation of cold and plasma flows in circuit-breakers. The underlying physical model is based on the axisymmetric form of the conservation equations which are coupled with an are model including ohmic heating and radiative exchanges of energy in the fluid. Various cases are computed, ranging from steady cold flow to unsteady arc-flow interaction. A good agreement has been found between the computed solutions and the available experimental data, demonstrating a great potential of these tools for circuit-breaker design and analysis in the future.

关键词： COLD Resistance heating EQUIPMENT circuit breakers conservation equations Flow Analysis Common Cold Hydrodynamics

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Cost analysis of a new algorithmic-based soft-error tolerant architecture

Cost analysis of a new algorithmic-based soft-error tolerant...

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IEEE International Symposium on defect and Fault Tolerance in VLSI Systems

作者： Y. Blaquiere G. Gagne Y. Savaria C. Evequoz Dept. of Comput. Sci. Quebec Univ. Montreal Que. Canada Electrical and Computer Engineering Department Ecole Polytechnique de Montreal Montreal QUE Canada

A new ABFT architecture is proposed to tolerate multiple soft-errors with low overheads. It memorizes operands on a stack upon error detection and corrects errors by recomputing. This allows uninterrupted input data s... 详细信息

关键词： Costs Algorithm design and analysis Hardware computer architecture Error correction Encoding computer errors Fault tolerant systems Equations Single event upset

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Parallel VLSI implementation of a new simplified architecture of Kalman filter

Parallel VLSI implementation of a new simplified architectur...

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： C.J.B. Fayomii M. Sawan S. Bennis Polytechnique Montreal Montreal QC CA Dept. of Electr. & Comput. Eng. Ecole Polytech. de Montreal Que. Canada Department of Civil Engineering Ecole de Technologie Supérieure Canada

A new approach for implementing a parallel VLSI architecture of a simplified Kalman filter (information filter) with unknown noise statistics is described. At the system level, the proposed approach is applied to a semi-systolic VLSI array to accelerate the matrix operations required in each iteration. In order to maximize the parallelism, a new architecture called the tri-trapezoidal array for implementing the Schur complement algorithm is proposed. The computations steps are decomposed into 2(m+1) parts executable in parallel. This decomposition decreases the computation time by 55%. The overall architecture exhibits a high performance and can be used for real time applications.

关键词： Very large scale integration Information filters computer architecture Information filtering Statistics Matrix decomposition Parallel processing Recursive estimation Kalman filters Covariance matrix

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A de-embedding technique for reflection-based S-parameters measurements of microwave devices

A de-embedding technique for reflection-based S-parameters m...

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Conference on Precision Electromagnetic Measurements (CPEM)

作者： F.M. Ghannouchi A. Brodeur F. Beauregard Polytechnique Montreal Montreal QC CA Dept. of Electr. & Comput. Eng. Ecole Polytech. de Montreal Que. Canada Microwave Research Laboratory Electrical and Computer Engineering Department Ecole Polytechnique de Montrèal Montreal Canada

A generalized calibration and de-embedding technique for reflection-based S-parameter measurements of microwave devices is proposed. This technique allows to perform the two-port calibration of a network analyzer directly from the embedded reflection coefficient measurements. This technique is a general one, in the sense that it can be implemented in network analyzers with or without transmission measurement capabilities.< >

关键词： Scattering parameters Microwave measurements Microwave devices Microwave theory and techniques Testing Fixtures Calibration Reflection Equations Coaxial components

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Small-signal modeling of high power HBTs using the scaling approach

Small-signal modeling of high power HBTs using the scaling a...

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Microwave, MTT-S International Symposium

作者： R. Hajji F.M. Ghannouchi A.B. Kouki Dept. of Electr. & Comput. Eng. Ecole Polytech. de Montreal Que. Canada Microwave Research Laboratory Department of Electrical and Computer Engineering Ecole Polytechnique de Montreal Canada

A systematic scaling approach for the modeling of high-power/large-size HBTs is presented. The measured S-parameters of a three elementary-cell HBT are compared to those obtained with the scaled model and the commonly used lumped equivalent circuit model. It is shown that a better fit to the measured S parameters is obtained when the scaled model is used. The interconnections and parasitics between elementary cells are accounted for based on the actual footprint of the device.< >

关键词： Power system modeling Scattering parameters Heterojunction bipolar transistors Equivalent circuits Integrated circuit interconnections

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MHMIC technology applied to active integrated antennas

MHMIC technology applied to active integrated antennas

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1994 Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 1994

作者： Roscoe, D.J. Berini, P. Cuhaci, M. Ittipiboon, A. Shafai, L. Communications Research Centre 3701 Carling Ave. OttawaONK2H8S2 Canada POLY-GRAMES Ecole Polytechnique de Montreal MontrealQCH3C3A7 Canada University of Manitoba Dept. of Electrical and Computer Engineering WinnipegMNR3T2N2 Canada

ISBN: (纸本)9780969256342

An active integrated antenna may be defined as a radiating element on which the current distribution along the structure may be altered in a controlled manner. The ability to control the current distribution along its structure is the unique feature of this class of antennas and gives it its primary advantage. With this ability, radiation characteristics such as pattern shape, axial ratio, and gain may all be controlled. An antenna configuration with integrated active devices has been developed [1]. The resultant topology is a microstrip transmission line configuration with cascade distributed amplifiers. This active antenna has been designed, modelled, fabricated, and its radiation characteristics measured. The above capabilities of controlling the radiation characteristics have been verified. The prototype active antenna utilized three packaged amplifiers and a microstrip transmission line on a Duroid substrate (ϵr=2.94) (Figure 1). To facilitate the fabrication of active integrated antennas, the application of Miniature Hybrid Microwave Integrated Circuit (MHMIC) technology was investigated. © 1994 ANTEM.

关键词： Electric lines

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High power microwave impedance measurements system suitable for in-situ thermo-dielectric material characterisation

High power microwave impedance measurements system suitable ...

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Microwave, MTT-S International Symposium

作者： M. Caron C. Akyel F.M. Ghannouchi Department of Electrical and Computer Engineering École Polytechnique Montreal QUE Canada Polytechnique Montreal Montreal QC CA Dept. of Electr. & Comput. Eng. Ecole Polytech. Montreal Que. Canada

A novel family of six-port reflectometers, designed in hybrid stripline-waveguide technology, is proposed for high power applications. In principle, there is no limitation in the input power level and the design can be adapted for any waveguide frequency band. A prototype was designed for the operational frequency of 2.45 GHz and measurements were made at power level up to 200 W.< >

关键词： Impedance measurement Stripline Prototypes Power measurement Frequency measurement

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On the nature and application of the space spectral-domain approach (SSDA)

On the nature and application of the space spectral-domain a...

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Microwave, MTT-S International Symposium

作者： Ming Yu R. Vahldieck Ke Wu COM DEV International Limited Cambridge ONT Canada Department of Electrical and Computer Engineering University of Victoria Victoria BC Canada Dept de genie Electrique Ecole Polytechnique Montreal QUE Canada

This paper describes the equivalence between the spectral domain method (SDM) and the method of lines (MoL). On the basis of this equivalence the Space-Spectral Domain Approach (SSDA) can be explained as either a two ... 详细信息

关键词： Discrete Fourier transforms Planar transmission lines Coplanar waveguides Transmission line theory Fourier transforms Eigenvalues and eigenfunctions Tellurium Application software Drives Resonant frequency

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Harvest model of an integrated hierarchical-bus architecture

Harvest model of an integrated hierarchical-bus architecture

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International Conference on Wafer Scale Integration

作者： R. Kermouche Y. Savaria D. Audet Dept. of Electr. Eng. Ecole Polytech. de Montreal Que. Canada Electrical Engineering Department Eole Polytechnique de Montréal Karlsruhe QUE Germany Department of Applied Sciences Université du Quàbec a Chicoutimi Chicoutimi QUE Canada

This paper presents a new approach to model the yield of a fault-tolerant hierarchical-bus structure, based on the expected value of the number of functional processors. With this method, easily computable mathematical expressions were obtained. Also, a defect tolerant communication network structure is proposed and analyzed in terms of additional hardware cost versus spares allocation. Assuming the network was successfully repaired, global reconfiguration of defective processing modules is then supported. Otherwise some graceful degradation would result. The results obtained, in terms of optimal distribution of spares in the communication network, show that complete duplication is not cost effective. However, redundancy can be added to the uppermost levels of the hierarchical tree in a very effective manner. Two harvest formulas were obtained; the first is an easily computed lower bound, and the second is exact according to the assumed defect density.< >

关键词： computer architecture Communication networks Redundancy Integrated circuit interconnections Fault tolerance Hardware degradation Cost function Ultra large scale integration Circuit faults

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MHMIC technology applied to active integrated antennas

MHMIC technology applied to active integrated antennas

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International Symposium on Antenna Technology and Applied Electromagnetics and the Canadian Radio Science Meeting, ANTEM/URSI

作者： D.J. Roscoe P. Berini M. Cuhaci A. Ittipiboon L. Shafai Communications Research Centre 3701 Carling Ave. Ottawa Ontario K2H 8S2 Canada POLY-GRAMES Ecole Polytechnique de Montreal Montreal Quebec H3C 3A7 Canada University of Manitoba Dept. of Electrical and Computer Engineering Winnipeg Manitoba R3T 2N2 Canada

An active integrated antenna may be defined as a radiating element on which the current distribution along the structure may be altered in a controlled manner. The ability to control the current distribution along its structure is the unique feature of this class of antennas and gives it its primary advantage. With this ability, radiation characteristics such as pattern shape, axial ratio, and gain may all be controlled. An antenna configuration with integrated active devices has been developed [1]. The resultant topology is a microstrip transmission line configuration with cascade distributed amplifiers. This active antenna has been designed, modelled, fabricated, and its radiation characteristics measured. The above capabilities of controlling the radiation characteristics have been verified. The prototype active antenna utilized three packaged amplifiers and a microstrip transmission line on a Duroid substrate (ε r =2.94) (Figure 1). To facilitate the fabrication of active integrated antennas, the application of Miniature Hybrid Microwave Integrated Circuit (MHMIC) technology was investigated.

关键词： Substrates Transmission line measurements Antenna measurements Phase shifters Microwave antennas Microstrip

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