By Topic

System Theory, 1988., Proceedings of the Twentieth Southeastern Symposium on

Date 20-22 March 1988

Filter Results

Displaying Results 1 - 25 of 133
  • Proceedings of the Twentieth Southeastern Symposium on System Theory (Cat. No.88CH2553-6)

    Publication Year: 1988
    Request permission for commercial reuse | PDF file iconPDF (337 KB)
    Freely Available from IEEE
  • Simulation of power converter devices with nonlinear elements

    Publication Year: 1988, Page(s):2 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    One goal of future spacecraft power systems research is to be able to model and simulate converter circuits with nonlinear elements. A method is presented for solving systems with nonlinear elements using an approach based on a homogeneous state model. The state equations are solved using the state transition matrix approach.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Solution to the ferroresonant jump problem in three-phase power conditioning systems

    Publication Year: 1988, Page(s):7 - 12
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    An analytical investigation leading to a solution for the ferroresonant jump problem in three-phase conditioning systems is presented. The solution is found through the analysis of the power-conditioning system steady-state behavior. This analysis showed that proper control of the harmonics present in an oscillatory mode can lead to the suppression of the oscillation and hence force the system int... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Energy density in classical electrodynamics

    Publication Year: 1988, Page(s):13 - 18
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    It is shown that once the Maxwell equations have been couched in terms of a system of first-order partial time derivatives, a novel type of energy density function becomes apparent. Analysis of some classical radiation and charge configurations suggests that the new measures are interesting alternatives to the conventional Poynting measures. In many instances the proposed measures and the Poynting... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the relation between transfer matrices and polynomial fractional representations of linear continuous-time time-varying systems

    Publication Year: 1988, Page(s):19 - 23
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (286 KB)

    Using the framework of E. Emre et al. (1982), an explicit relationship between transfer matrices and (right or left) polynomial fractional representations of linear continuous-time time-varying systems is given. The authors also show that the matrix (pI-F) for the time-varying system Sigma =(F,G,H) has a left inverse over a skew ring.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of DFT and FFT algorithms to spectral analysis of power system load variation

    Publication Year: 1988, Page(s):26 - 29
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (203 KB)

    The discrete Fourier transform (DFT) and the fast Fourier transform (FFT) are based on certain assumptions that must be understood and satisfied, or misleading results will be obtained. The authors examine these assumptions and qualitatively analyze the effect of these dangers when the FFT algorithm is supplied to power system load variation. They recommend the use of a DFT algorithm to evaluate t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Study of power system harmonics in an unbalanced system using the three-phase bus impedance matrix

    Publication Year: 1988, Page(s):30 - 34
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (226 KB)

    The authors study the effect of harmonic current injected at a certain bus on the voltages at the other buses using the three-phase bus impedance matrix of an unbalanced system at normal and abnormal conditions. The effects of the system capacitors (grounded or ungrounded) in the presence of harmonic distortion is also studied. The results show that for both normal and abnormal system conditions, ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Evaluation of ungrounded faults in transposed high phase order systems

    Publication Year: 1988, Page(s):35 - 39
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (193 KB)

    High-phase-order transmission is considered as a viable alternative for increasing the power transmission capability of a transmission line. Fault analysis is an important aspect of the determination of breaker and protection specifications. General expressions for the fault currents and voltages for various types of ungrounded (isolated) faults are derived for any N-phase system. Actual calculati... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reduced order estimation of systems with nonlinear interconnections

    Publication Year: 1988, Page(s):40 - 42
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (81 KB)

    Large-scale systems modeled as interconnections of smaller subsystems are considered. Under the assumption that nonlinearities satisfy sector type conditions, nonlinear reduced-order observers are designed to estimate system states for control purposes. The observer gains are obtained using standard linear techniques at the subsystem level.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • CAD package L-A-S: a research and education tool in systems and control

    Publication Year: 1988, Page(s):44 - 49
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (347 KB)

    A review is presented of the basic features of the high-level interactive language L-A-S (linear algebra and systems) used in CAD (computer-aided design) of linear control systems. Modular structure of the language permits easy modifications, updating and extensions. The language is implemented on mini- and microcomputers. The use of the L-A-S is illustrated on the typical LQG/LTR (linear quadrati... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A high level descriptive language for the automatic generation of Fortran and Pascal code

    Publication Year: 1988, Page(s):50 - 55
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (249 KB)

    The authors show that if a given software end product is developed in accordance with the principles of strongly typed data constructs and structured programming, then the translation of such a software system into other languages can be fully automated. For this purpose, an interactive computer-aided programming environment (CAPE) that supports a strongly typed, structured graphical descriptive l... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Claudius: an interactive graphical software design method

    Publication Year: 1988, Page(s):56 - 60
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (365 KB)

    The authors describe Claudius, a proposed graphical software design system for teaching software design. This system uses a goal-driven technique which is language-independent and encourages visualization of patterns and templates which are common in software design. These patterns are represented as flowcharts which can be combined into a single plan. Subprograms are represented with input and ou... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An emulation tool for verification of complex algorithms implemented on a multiple processor

    Publication Year: 1988, Page(s):61 - 68
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (399 KB)

    Algorithms have been developed for the efficient partitioning of matrix operations such as addition, subtraction, multiplication, matrix inversion, etc., and the allocation of parallel computational tasks in a multiprocessing environment. A single instruction-multiple data stream (SIMD) machine has been developed to implement the suggested scheduling algorithms for matrix computations. To verify t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An efficient method of solving for the eigenvalues in a dynamic transfer matrix analysis of beams, shafts and rotors

    Publication Year: 1988, Page(s):70 - 74
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The eigenvalues in a dynamic transfer matrix analysis have usually been obtained by trial-and-error searching for values which set a characteristic determinant to zero. Such a procedure requires an initial value, a step size, and a range over which the eigenvalues are sought. To be sure that an eigenvalue has not been missed by the search, it may be necessary to find all eigenvalues. To do so may ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • False lock in Costas loops

    Publication Year: 1988, Page(s):75 - 79
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (325 KB)

    Results are given on the phenomenon of data-related false lock in a Costas loop which contains a perfect integrator in its loop filter. The input carrier to the loop is assumed to be biphase-modulated with a T' periodic binary sequence constructed from Manchester symbols; there are p symbols per period. As a result, the false locked loop is described by a nonlinear system with periodic coefficient... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Decentralized discrete-time filters

    Publication Year: 1988, Page(s):81 - 83
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (126 KB)

    The authors develop decentralized estimators for linear, discrete-time, interconnected large-scale systems. Each estimator uses only local information and estimates local state and interface variables. The dynamic model used consists of the subsystem model and an interface model. The latter is obtained using aggregation techniques.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A projective method for collision detection of robot arms moving among obstacles

    Publication Year: 1988, Page(s):86 - 90
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (353 KB)

    The authors present a projective method for collision detection for robot arms moving among obstacles. A mixed model for describing objects is suggested. Procedures for intersection checking among primitive shapes are developed that are based on the idea that two objects have no intersection if one can find a particular projection direction such that the images of the two objects have no intersect... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Integrating artificial intelligence into the undergraduate engineering curriculum

    Publication Year: 1988, Page(s):91 - 94
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (234 KB)

    The author relates experience at Clemson University in offering a specially structured one-semester undergraduate course on applied artificial intelligence. In addition, a longer term and more integrated involvement of AI technology in the undergraduate engineering curriculum is suggested. A number of unresolved issues regarding this integration are posed and discussed.<> View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An alternative approach to image labeling using neural networks

    Publication Year: 1988, Page(s):95 - 99
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (305 KB)

    A solution of the image labeling problem using the emerging computational paradigm of neural nets is shown. An overview of neural network technology is provided and the labeling problem is formulated as a problem in symbolic constraint satisfaction. A neural network structure which embodies the labeling constraints is developed in detail. Experimental results and network convergence properties are... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analog circuit design based on neural networks

    Publication Year: 1988, Page(s):100 - 105
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    Neural networks have been studied for many years with the hope of achieving human-like performance in such fields as speech and image recognition. A recent resurgence has resulted from VLSI advances, neural network models, and learning algorithms. Neural networks are also very suitable in certain areas such as NP-complete constraint and satisfaction problems, due to the nature of parallel and dist... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Some new algorithms for ESM data processing

    Publication Year: 1988, Page(s):108 - 112
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (291 KB)

    The identification of emitters by an ESM (electronic support measure) system is becoming increasingly difficult due to the presence of emitters exercising complex parameter modulations such as frequency agility. Pulse de-interleaving techniques that can be used in this situation fall into the following categories: time-of-arrival de-interleaving, pigeon hole de-interleaving, and de-interleaving us... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Adaptive detection of CPFSK signals in non-Gaussian noise

    Publication Year: 1988, Page(s):114 - 119
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (347 KB)

    Adaptive detection of CPFSK (continuous phase frequency shift keying) signals corrupted by class-A impulse noise is presented. The EM algorithm (E for expectation, M for maximize) is used to estimate the noise characteristics. Performance of the EM algorithm and the adaptive detector are reported. The results show that the adaptive detector performs very close to optimal for reasonable sample size... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An IIR filter approach to fast convergence spectral analyzers

    Publication Year: 1988, Page(s):120 - 123
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (238 KB)

    The use of the cascading form realization of an infinite-impulse response (IIR) linear time-invariant (LTI) filter in the estimation of the autocorrelation function from a stream of data samples provides a direct access to a variety of fast and slow convergence recursive power-spectrum estimators. These estimators are generated by first transforming the data into the spectrum domain and then propa... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Jittered sampling: a nonseparable three dimensional model

    Publication Year: 1988, Page(s):124 - 128
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (327 KB)

    The author show that three-dimensional spatiotemporal jittered sampling is not a direct extension of jittered sampling in one dimension. A model is developed in which the periodicity of the single-frame sampling function as well as the time to scan each picture element is taken into account. As a result, the power-spectral density of the sampled image consists of replications of the original image... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Thermal analysis of electrical transmission cables in space

    Publication Year: 1988, Page(s):130 - 134
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (214 KB)

    The electrical transmission lines from an electrical power source to a remote space station must be designed to transmit the required power without overheating. The power losses in the conductors are conducted through the insulation to the surface and at the surface radiated to space. A steady-state analysis is made which considers the line to be continually exposed to the sun's rays. This results... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.