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[1990] Proceedings. The Twenty-Second Southeastern Symposium on System Theory

11-13 March 1990

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Displaying Results 1 - 25 of 128
  • Robust current mode control of switching DC-DC converters

    Publication Year: 1990
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (81 KB)

    Summary form only given. The authors propose an approach that results in a controller and filter design that is optimal and robust and in which the interacting effects (coupling) of the filter and the controller are used as extra degrees of freedom in the selection of the controller gains and filter components. In particular, the controller and filter design methodology is based on a linear quadra... View full abstract»

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  • Multiple point source location via infrared array processing methods

    Publication Year: 1990, Page(s):230 - 234
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (309 KB)

    The detection and location of multiple targets in a noisy environment are considered. High-resolution direction-finding techniques have proved to be effective in radar and sonar multiple-target-location applications. In these problem domains, the data being modeled can be represented as a linear combination of fundamental signals whose behavior is parametrically dependent on the location parameter... View full abstract»

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  • Optimal robust controller design of a high performance vector controlled synchronous permanent magnet motor drive

    Publication Year: 1990, Page(s):270 - 271
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (125 KB)

    Summary form only given. A critical evaluation of the cascade decentralized controller now commonly used in high-performance drives has been undertaken. It has been shown that this structure is only useful for drives where (a) the disturbances are significant and nonexciting, i.e. constant, and (b) part of the model has non-minimum-phase characteristics and the portion of the model that has minimu... View full abstract»

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  • Capacitive compensation of large induction motor drives

    Publication Year: 1990, Page(s):284 - 285
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB)

    Summary form only given. The influence of the combined effects of series and parallel compensation on a large induction motor has been studied. The following are the contributions of this research. (1) The selection of series and parallel capacitors to attain simultaneously good steady-state voltage regulation and a power factor improvement; (2) structural changes in compensating elements to elimi... View full abstract»

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  • Static bifurcation in induction generators

    Publication Year: 1990
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (70 KB)

    Summary form only given. A simplified approach to studying the phenomenon of self-excitation in induction generators, based on the concept of static bifurcation and the q-d equivalent circuit equation in the synchronous reference frame, is proposed. This approach provides the necessary framework for identifying the boundary of possible self-excitation for a generalized load comprising both resisti... View full abstract»

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  • Twenty-Second Southeastern Symposium on System Theory (Cat. No.90TH0301-2)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (552 KB)
    Freely Available from IEEE
  • Waveform coding using time code multiplexing

    Publication Year: 1990, Page(s):206 - 208
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    A uniform amplitude sampler is presented as an alternative to uniform time-sampling systems. Time code multiplexing (TCM) consists of an encoder and a decoder. The encoder transmits the quantized time intervals corresponding to the time at which the input signal passed through uniformly spaced amplitude levels. The decoder reconstructs the signal by using a sin(x)/x convolution i... View full abstract»

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  • Using singular values for model reduction of flexible structures

    Publication Year: 1990, Page(s):195 - 203
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    Finite-element methods (FEMs) and extraction from experimental data are the most widely used methods for developing models of flexible structures for the analysis, design, and simulation of control systems. However, these methods produce models with modes that do not contribute significantly to the fidelity of the model. Eliminating these modes is the major focus of this work. Particular attention... View full abstract»

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  • Precision pointing error analysis in a satellite optical communication optical system

    Publication Year: 1990, Page(s):190 - 194
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The authors present details of the design considerations for two candidate precision pointing and tracking control subsystems proposed for use in an optical intersatellite communication system. In addition, disturbance effects are identified, and appropriate models for the disturbances are developed. Simulations of the control system are performed. Preliminary simulation results indicate superior ... View full abstract»

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  • A scheduling scheme for communicating tasks

    Publication Year: 1990, Page(s):91 - 97
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    Heuristic methods are proposed for assigning a set of soft tasks to a set of PEs (processing elements) in such a way that the set of tasks has a minimum execution time. The objective is to try to meet the performance requirements of applications, especially of real-time applications. Emphasis is placed on specific applications where there are more PEs than active tasks. Two criteria are proposed t... View full abstract»

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  • Issues in the application of H control to large space structures

    Publication Year: 1990, Page(s):183 - 189
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    An H controller is designed for a subsystem of a large, flexible space structure. Issues concerning the incorporation of robustness and performance criteria as frequency-dependent weights are addressed. Simulation results and closed-loop frequency responses are included. In addition, an analysis of the singular-value frequency response of the controller raises questions ... View full abstract»

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  • Graphical programming for the transputer

    Publication Year: 1990, Page(s):86 - 90
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The Multigraph programming environment provides a very-high-level programmer interface for the development of parallel and real-time processing systems. It is specifically targeted for large systems wishing to integrate a knowledge-based synthesis technique with standard numerical techniques. The result is a graphical editing environment where the user models the structure of the desired computati... View full abstract»

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  • Modeling and identification of human musculoskeletal walking system

    Publication Year: 1990, Page(s):146 - 150
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Several methods are tested to identify the human musculoskeletal system both as a linear and nonlinear system. For the linear system approach, a MIMO (multiinput, multioutput) ARX (autoregressive with exogeneous inputs) model is first tested to get a rough estimation of the system structure and parameters. A general linear input-output MIMO model is then developed, and parameters are estimated by ... View full abstract»

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  • Design issues in the control of large flexible spacecraft slew maneuvers

    Publication Year: 1990, Page(s):178 - 182
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    Linearized dynamical models of slew maneuvers of a large flexible spacecraft are utilized to design state feedback control systems to perform arbitrary slew maneuvers and to achieve total vibration suppression of flexible appendages. The control system designs are based on linear quadratic Gaussian loop transfer recovery (LQG/LTR) design methodology. The linearized slew maneuver equations used are... View full abstract»

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  • Architecture for a human-robot symbiotic system

    Publication Year: 1990, Page(s):78 - 83
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    A description is given of a human-robot symbiont that is under development. The authors present an overview of the symbiotic system, motivating the architecture that has been developed. The architecture is a hierarchical structure that consists of several expert systems which reside above a robot control interface. This interface allows the manipulator to be operated in both a teleoperated and aut... View full abstract»

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  • The concept of hyperspace in dynamical system theory

    Publication Year: 1990, Page(s):462 - 466
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    A new generalization of the state-space concept called hyperstate space, or simply hyperspace, is presented. The concept of hyperspace enables the quick determination of certain important geometric and analytic features of system-dynamic behavior without explicitly solution of the system state equations. The usefulness of the hyperspace concept is demonstrated by several examples from different ar... View full abstract»

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  • The design of a microcontroller-based panel measurement and control system

    Publication Year: 1990, Page(s):426 - 430
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A system called the panel measurement and control device (PMCD) is discussed. The PMCD provides a remote control access to a residential electrical circuit breaker panel box. The PMCD communicates through two optical fiber cables. The executable commands include (1) turning a specified circuit breaker on or off, (2) measuring the current flowing through a specified circuit breaker, and (3) measuri... View full abstract»

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  • Active sonar classification using Bayesian decision theory

    Publication Year: 1990, Page(s):578 - 582
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    Consideration is given to the performance analysis of optimal sonar classification. To perform active classification, a known waveform is transmitted into a medium and directed toward a region called the test volume. An array of N sensors is used to pick up the backscattered signal energy reflected from the M cells of the test volume, and the data are input into a processing algo... View full abstract»

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  • Parallel state estimation in power systems

    Publication Year: 1990, Page(s):255 - 260
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The authors present an extensive review of the work to date on the subject of parallel state estimation. Modifications to an existing multilevel state estimator for power systems, based on the method of least squares, are proposed. These modifications are expected to improve the quality of the overall estimated system state View full abstract»

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  • Identification of critical modes of large-scale systems excited with several input functions

    Publication Year: 1990, Page(s):141 - 145
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The authors present a methodology for identifying the critical modes of large-scale systems excited by several input functions, including step and impulse functions. A quadratic performance measure is defined. This index is related to the type of application under consideration. For example, the index can be a function of the output variables or some other desired state variables. Each eigenvalue ... View full abstract»

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  • The use of microwaves to characterize optically stimulated semiconductors

    Publication Year: 1990, Page(s):624 - 629
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The author discusses a theoretical model describing the microwave transmission and reflection properties of semiconductor wafers after they have been illuminated by a short pulse of light from a laser. The model has three fundamental parts. The first part describes the absorption mechanism of the incident light pulse throughout the semiconductor, given the electron-hole-pair concentration as a fun... View full abstract»

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  • Fast architectures for pattern recognition and classifier training

    Publication Year: 1990, Page(s):17 - 21
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    A systolic architecture is presented for the classification of patterns using the maximum likelihood algorithm. A unique feature of the architecture is the capability of online training. By use of recursive expressions, the classification functions can be updated taking into account all the previous parameters. The proposed architecture is capable of classifying an N-dimensional pattern i... View full abstract»

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  • Plane wave excitation of the parallel plate-loaded slot antenna

    Publication Year: 1990, Page(s):173 - 176
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Two numerical solutions are given for an integrodifferential equation governing the electric field in the aperture of a parallel-plate, waveguide-loaded, slot antenna excited by an obliquely incident plane wave. Resultant aperture field distributions obtained via Galerkin's method with a basis of edge-condition weighted Chebyshev polynomials are compared with the results from pulse expansion with ... View full abstract»

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  • Kinematic analysis and control of a 7-DOF redundant telerobot manipulator

    Publication Year: 1990, Page(s):71 - 77
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The authors deal with the kinematic analysis and control of a kinematically redundant manipulator, which is the slave arm of a telerobot system recently built at Goddard Space Flight Center (GSFC) to serve as a testbed for investigating research issues in telerobotics. A forward kinematic transformation is developed in its most simplified form, suitable for real-time control applications, and the ... View full abstract»

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  • Thresholding, Hamming distance, unipolar/bipolar binaries, and retrieval in neural network based memories

    Publication Year: 1990, Page(s):455 - 459
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The use of a bipolar retrieval key has the effect of doubling the length of the probe vector and making the number of +1's equal to the number of -1's in the stored vectors, even if the original stored vectors have an unequal number of +1's and -1's. The threshold conditions suggested by Hopfield and many others are examined, and certain proposed modifications to these functions are shown to be co... View full abstract»

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