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PRACTICAL APPLICATIONS OF THE KRAMERS-KRONIG RELATIONS

CORROSION 1991年第4期47卷 248-259页

作者： ORAZEM, ME ESTEBAN, JM MOGHISSI, OC Univ of Florida Gainesville FL United States

A technique is presented for using the Kramers-Kronig (KK) relations to evaluate the consistency of impedance data that do not exhibit a DC limit. The approach presented here differs from current algorithms because extrapolation of experimental data, required to evaluate the integral relations, is achieved without the assumption of an equivalent circuit and without extrapolation of polynomial fits of the available data. The impedance values below the lowest measured frequency omega-min are calculated, which would "force" the available data to satisfy the KK relations. Consistent data set have been shown to yield calculated impedance values which are finite and continuous with the experimental data at omega-min. Discontinuities between the calculated impedance and the experimental data set can be attributed to violation of one or more conditions of the KK relations. The proposed algorithm is applied to experimental impedance data obtained for a metal hydride electrode and a rotating copper-disk electrode. The technique is shown to be sensitive for testing violations of the stability condition and is used to identify a lower frequency bound for data that satisfy the KK relations. The implications to equivalent circuit fitting procedures and to the estimation of the polarization resistance are discussed.

关键词： computer algorithm IMPEDANCE KRAMERS-KRONIG RELATIONS

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DESIGN-BASED COMPUTATIONAL-PROCEDURE FOR PERFORMANCE PREDICTION AND ANALYSIS OF SELF-EXCITED INDUCTION GENERATORS USING MOTOR DESIGN PACKAGES

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IEE PROCEEDINGS-B ELECTRIC POWER APPLICATIONS 1988年第1期135卷 8-16页

作者： MURTHY, SS NAGARAJ, HS KURIYAN, A KIRLOSKAR ELECT CO LTD BANGALORE 560055INDIA

A computer algorithm is explained in order to determine the performance of capacitor self-excited induction generators (SEIG) taking the machine design details as the input data. The magnetisation characteristic which forms the basis of analysis is obtained using theB/Hcurve of the core material and by employing a curve-fitting technique. The predicted parameter and performance characteristics of a normal induction motor operating as SEIG are compared with corresponding experimental results. Effects of variation of realistic design parameters are studied to obtain guidelines on optimum design. Typical results on a range of normal induction machines are presented to assess their suitability as SEIG.

关键词： performance analysis asynchronous generators Power engineering computing design parameters induction motors performance prediction electric machine analysis computing curve-fitting technique magnetisation characteristic B/H curve capacitor selfexcited induction generators design-based computation input data core material machine design details computer algorithm motor design packages optimum design Asynchronous machines

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A Subject-Independent Method for Automatically Grading Electromyographic Features During a Fatiguing Contraction

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IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING 2012年第6期59卷 1749-1757页

作者： Chattopadhyay, Rita Jesunathadas, Mark Poston, Brach Santello, Marco Ye, Jieping Panchanathan, Sethuraman Arizona State Univ Dept Comp Sci & Engn Tempe AZ 85287 USA Arizona State Univ Ctr Cognit Ubiquitous Comp Tempe AZ 85287 USA Arizona State Univ Sch Biol & Hlth Syst Engn Tempe AZ 85287 USA Cleveland Clin Dept Biomed Engn Ctr Neurol Restorat Lou Ruvo Ctr Brain Hlth Las Vegas NV 89106 USA Arizona State Univ Ctr Evolutionary Med & Informat Biodesign Inst Tempe AZ 85287 USA

Many studies have attempted to monitor fatigue from electromyogram (EMG) signals. However, fatigue affects EMG in a subject-specific manner. We present here a subject-independent framework for monitoring the changes in EMG features that accompany muscle fatigue based on principal component analysis and factor analysis. The proposed framework is based on several time-and frequency-domain features, unlike most of the existing work, which is based on two to three features. Results show that latent factors obtained from factor analysis on these features provide a robust and unified framework. This framework learns a model from EMG signals of multiple subjects, that form a reference group, and monitors the changes in EMG features during a sustained submaximal contraction on a test subject on a scale from zero to one. The framework was tested on EMG signals collected from 12 muscles of eight healthy subjects. The distribution of factor scores of the test subject, when mapped onto the framework was similar for both the subject-specific and subject-independent cases.

关键词： computer algorithm electromyogram (EMG)

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Network flow analysis algorithms

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ECOLOGICAL MODELLING 2006年第3-4期192卷 586-600页

作者： Latham, LG Univ Med Prod USA Inc Irvine CA 92606 USA

Network flow analysis relies on mathematical techniques to gain knowledge about network structure in real and theoretical systems. From a two-dimensional representation of the flow of material, energy, or information in a network, indices and matrices provide non-obvious knowledge about the system. Where the indices and matrices are described in the literature, researchers rarely find an algorithm or computer code example to facilitate the inclusion of the technique into their projects. Researchers are forced to code the algorithms from scratch, which can be difficult, or obtain them from other investigators, which is time-consuming. In this paper, I describe the most popular network flow analysis indices and matrices with reference to relevant citations and supply algorithms and free software for their calculation. I also propose that researchers adopt a consistent set of primary symbolic letter designations for the indices and matrices. (c) 2005 Elsevier B.V. All rights reserved.

关键词： network analysis computer algorithm

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A COMPUTATIONAL algorithm FOR ROBUST-CONTROL SYSTEM-DESIGN

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computerS & ELECTRICAL ENGINEERING 1994年第1期20卷 61-69页

作者： ALMUTHAIRI, NF MAHMOUD, MS KUWAIT UNIV DEPT ELECT & COMP ENGNSAFAT 13060KUWAIT

In this paper, the control design problem of linear discrete-time uncertain systems with time-varying uncertainties is considered. A computer algorithm is developed to find the controller gains that asymptotically stabilize the uncertain systems. The stabilization scheme is based on the constructive use of Lyapunov theory. The theoretical results are applied to different examples.

关键词： LYAPUNOV METHOD ROBUSTNESS STABILITY STATE FEEDBACK UNCERTAIN SYSTEMS DISCRETE-TIME SYSTEMS TIME VARYING UNCERTAINTIES computer algorithm DISCRETE LYAPUNOV MATRIX EQUATION

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DIGITAL-SIMULATION OF B/H EXCURSIONS FOR POWER-SYSTEM STUDIES

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IEE PROCEEDINGS-C GENERATION TRANSMISSION AND DISTRIBUTION 1988年第3期135卷 202-209页

作者： RAY, S Department of Electrical Engineering College of Technology Govind Ballabh Pant University of Agriculture and Technology Pantnagar India

Many power system circuits contain iron cored coils, which are common nonlinear circuit elements. Systems engineers have to model these elements while studying such phenomena as inrush current, ferroresonance, subharmonics etc. The nonlinearity involved in these elements cannot be appropriately taken into account unless due regard is given to the damping effects on account of hysteresis. This paper attempts to simulate digitally the appropriate paths ofB/Hexcursions in a piecewise linear manner when the magnetic core is subjected to random variations of magnetic field intensity and sets up a computer algorithm. The algorithm may be used in digital analysis of systems containing iron cored coils.

关键词： magnetic hysteresis random variations iron cored coils Power engineering computing magnetic core Magnetic cores magnetic field intensity damping effects power system studies inrush current Power systems magnetic cores power system analysis computing computer algorithm nonlinear circuit elements nonlinear network analysis damping subharmonics ferroresonance B/H excursions digital simulation

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ANALYTICAL AND EXPERIMENTAL-STUDY OF VIBRATING RECTANGULAR-PLATES ON RIGID POINT SUPPORTS

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AIAA JOURNAL 1991年第5期29卷 838-844页

作者： GORMAN, DJ SINGAL, RK CANADIAN SPACE AGCY DIRECTORATE SPACE MECHOTTAWA K2H 852ONTARIOCANADA

An analytical-type solution based on the superposition method is developed for the free-vibration frequencies and mode shapes of rectangular plates resting on arbitrarily located rigid point supports. The supports are of the type realized by means of bolts or spot welds. An extensive experimental program was conducted in support of the project, and excellent agreement between computed and experimental results was obtained. While the analysis is general in nature, it will be highly applicable to the study of vibration of electronic circuit boards and solar panels.

关键词： Resonant Frequencies Electronic Circuits Bending Moment Aspect Ratio computer algorithm Poisson's Ratio Frequency Response Functions Flexural Rigidity Accelerometer Fatigue Life

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Alignment and initial operation of an advanced solar simulator

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JOURNAL OF SPACECRAFT AND ROCKETS 1996年第6期33卷 867-869页

作者： Jaworske, DA Jefferies, KS Mason, LS NASA Lewis Research Center Cleveland Ohio 44135

A solar simulator utilizing nine 30-kW xenon ape lamps was built to provide radiant power for testing a solar dynamic space power system in a thermal vacuum environment. The advanced solar simulator achieved the following values specific to the solar dynamic system: 1) a subtense angle of 1 deg;2) the ability to vary solar simulator intensity up to 1.7 kW/m(2);3) a beam diameter of 4.8 m;and 4) uniformity of illumination on the order of +/-10%. The flexibility of the solar simulator design allows for other potential uses of the facility.

关键词： Solar Simulator Power System Photodiodes Radiant Energy Thermal Energy Storage Eclipses Jet Propulsion Laboratory Electric Power Statistical Analysis computer algorithm

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Minimax D-optimal designs for the logistic model

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BIOMETRICS 2000年第4期56卷 1263-1267页

作者： King, J Wong, WK Univ Calif Los Angeles Dept Biostat Los Angeles CA 90095 USA

We propose an algorithm for constructing minimax D-optimal designs for the logistic model when only the ranges of the values for both parameters are assumed known. Properties of these designs are studied and compared with optimal Bayesian designs and Sitter's (1992, Biometrics, 48, 1145-1155) minimax D-optimal kk-designs. Examples of minimax D-optimal designs are presented for the logistic and power logistic models, including a dose-response design for rheumatoid arthritis patients.

关键词： approximate designs computer algorithm D-optimality efficiency information matrix power logistic model

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Optimizing subcritical-flow thrust-vectoring of converging-diverging nozzles

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JOURNAL OF PROPULSION AND POWER 2000年第2期16卷 202-206页

作者： Wilson, EA Adler, D Bal-Or, BZ Sherbaum, V Lichtsinder, M Technion Israel Inst Technol Turbomachinery Lab IL-32000 Haifa Israel Technion Israel Inst Technol Jet Engine Lab IL-32000 Haifa Israel

Engine thrust vectoring (TV) is a potential technology for military and future civil aircraft in which the Technion-Israel Institute of Technology has made significant contributions. This paper provides realistic predictions of steady-state engine performance during steady-state pitch vectoring. The results obtained comprise a required fundamental step for advanced aircraft/TV implementation. This work is a part of the Lockheed Martin yaw-pitch TV F-16/F-100 research study conducted here at the Jet Laboratory. To this end, a unique TV-engine computer algorithm has been developed that expands the conventional steady-state modeling capabilities of on- and off-design as well as the conventional transients (via throttle changes) to create steady-state and dynamic TV-engine simulations at various altitudes and Mach numbers. This paper reviews the steady state performances and the optimization observations initially obtained. The subcritical flow realm of nozzle performance provides trends aiding in the prediction of thrust benefits beyond the conventional nozzle design of the F100 model are available as the effective nozzle throat area is allowed to contract through vectoring.

关键词： Thrust Vectoring Convergent Divergent Nozzles Yaw Civil Aircraft Subcritical Flow Thermodynamic Engine computer algorithm Mach Numbers MiG 29 Angle of Attack

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