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Decision and Control including the Symposium on Adaptive Processes, 1979 18th IEEE Conference on

Date 12-14 Dec. 1979

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Displaying Results 1 - 25 of 252
  • [Front cover and table of contents]

    Publication Year: 1979 , Page(s): c1
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    Freely Available from IEEE
  • Foreword

    Publication Year: 1979 , Page(s): iii
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    Freely Available from IEEE
  • An aggregation method for active control of large space structures

    Publication Year: 1979 , Page(s): 1 - 3
    Cited by:  Papers (5)
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  • Reduced-order modeling of large-scale systems by chained aggregation

    Publication Year: 1979 , Page(s): 4 - 5
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    An approach to model reduction using "chained aggregation" is described. Chained aggregation yields a special system representation, the Generalized Hessenberg Representation. This representation suggests candidate reduced order systems. Manipulations of these candidate systems are presented to obtain reduced-order models. Emphasis is placed on the use of the "restricted QL algorithm" to obtain low-order equivalents. View full abstract»

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  • Minimax control

    Publication Year: 1979 , Page(s): 6
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    It is well known that for a controllable system the closed loop poles can be placed where ever one desires by appropriate choice of the feedback control law. However when only some part of state vector is available for use in constructing the feedback controller it is a more formitable problem to decide what closed loop pole configurations are possible. In this paper, we consider generalized coupled harmonic oscillators, with a scalar control constrained to feedback only the velocity vector and producing stable closed loop systems, optimal rate feedback in view of the results of Kalman on the inverse problem. View full abstract»

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  • Polynomial characterizations of (F, G)-invariant and reachability subspaces

    Publication Year: 1979 , Page(s): 7 - 10
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    Polynomial characterizations of (F, G)-invariant and reachability subspaces are presented. View full abstract»

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  • Matrix fraction descriptions of linear time-invariant systems

    Publication Year: 1979 , Page(s): 11 - 16
    Cited by:  Papers (1)
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    In this paper an algorithm is presented for obtaining a relatively prime matrix fraction description (MFD) for a time-invariant linear system in state space form not necessarily of minimal dimension. The algorithm first performs a sequence of simple coordinate transformations on the state vector of the system. The observability (controllability) indices of the system are also determined at this time. The relatively prime factors of an MFD are then obtained via a recursive procedure involving the submatrices of the state and the input matrix of the transformed state space system. A numerical example is given to illustrate the use of the algorithm. View full abstract»

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  • Controllabilities, observability and duality in linear systems with multiple norm-bounded controllers

    Publication Year: 1979 , Page(s): 17 - 22
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    The paper considers controllabilities of linear systems with multiple independent controllers, each of which is norm-bounded. Both the usual (cooperative) as well as the max-min (non-cooperative) controllability are examined. The problem of sending the initial state to some closed and convex target set is investigated. For the cooperative mode, a duality theory between controllability and observability is given, extending Kalman's fundamental result to the constrainted case. View full abstract»

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  • Essential right inverses and system zeros

    Publication Year: 1979 , Page(s): 23 - 28
    Cited by:  Papers (2)
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    The theory of inverse dynamical systems has been and is continuing to be a keystone in the development of the theories of multivariable feedback control systems and of coding theory for reliable communication. Advances in understanding of the role of plant inverses in control system design have brought about additional insights, for example, in the general areas of decoupled design and of realistic possibilities for closed loop dynamical performance. Surprisingly enough, almost all the existing literature on inverse systems is cast in terms of matrices. Though the well known module theoretic approach to systems has been in place for a decade or more, this approach has not been fully exploited to bring out the foundations of a theory for inverse systems. This paper begins to lay such a foundation by developing a module theoretic definition of right inverse systems. One promising and immediate application of the theory is to an improved conceptual understanding of multivariable zeros. View full abstract»

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  • On the duality between gain and frequency

    Publication Year: 1979 , Page(s): 29 - 30
    Cited by:  Papers (1)
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    Using a matrix pencil representation for linear time-invariant multivariable systems, the well-known duality between closed-loop characteristic frequencies as a function of scalar gain and open-loop characteristic gains as a function of scalar frequency is demonstrated in an elementary way. This demonstration shows the duality between root-locus and frequency-domain design techniques and is extended to show that a feedback gain matrix has a natural dual frequency matrix. View full abstract»

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  • Eigenvector chains for finite and infinite zeros of rational matrices

    Publication Year: 1979 , Page(s): 31 - 32
    Cited by:  Papers (5)
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    A procedure for defining eigenvector chains for a (possibly singular) rational matrix, at any finite or infinite zero, is proposed, and some justification for the definition is presented. View full abstract»

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  • Feedback system design: The fractional representation approach to analysis and synthesis

    Publication Year: 1979 , Page(s): 33 - 37
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    The problem of designing a feedback system with prescribed properties is attacked via a fractional representation approach to feedback system analysis, and synthesis. To this end we let H denote a ring of operators with the prescribed properties and model a given plant as the ratio of two operators in H. This, in turn, leads to a simplified test to determine whether or not a feedback system in which that plant is embedded has the prescribed properties and a complete characterization of those compensators which will "place" the feedback system in H. The theory is formulated axiomatically to permit it's application in a wide variety of system design problems and is extremely elementary in nature requiring no more than addition, multiplication, subtraction, and inversion for its derivation even in the most general settings. View full abstract»

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  • The relationship between implicit model following and eigenvalue eigenvector placement

    Publication Year: 1979 , Page(s): 38 - 42
    Cited by:  Papers (2)
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    In implicit model following one attempts to change the output dynamics of the plant using feed-back so as to equal the output dynamics of a desirable model. This paper presents a solution to implicit model following using the theory of feedforward matrices. The solution is reformulated and shown to be equivalent to eigenvalue eigenvector placement. View full abstract»

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  • Indefinite inner product spaces in optimal control

    Publication Year: 1979 , Page(s): 43 - 44
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  • Optimal control systems with low sensitivity to small time delays

    Publication Year: 1979 , Page(s): 45 - 48
    Cited by:  Papers (1)
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    The problem of reducing trajectory sensitivity to small time delays is considered. State and output feedback gains are computed, so that the system performs optimally with low sensitivity. The delay is assumed to be expected to occur in the plant or in the feedback path. Numerical examples are discussed. View full abstract»

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  • Generalized quadratic optimal controllers for linear hereditary systems

    Publication Year: 1979 , Page(s): 49 - 54
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  • An application of adaptive control techniques in metrology

    Publication Year: 1979 , Page(s): 55 - 59
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    This paper examines the dynamic performance of an automated optical gauging instrument. A mathematical model of the system is developed which demonstrates the intrinsically non-linear characteristics which provide coupling between two nominally independent control loops. Approximate stability bounds for the closed-loop system are established using the describing function matrix technique. The inverse Nyquist diagram is used to design appropriate compensation networks, taking into account design objectives including the avoidance of various limit cycles and a rapid transient response. The final design is implemented on the instrument and its behaviour compared with the simulated system. It is shown that the response time is reduced to approximately 11% of that of the original system in agreement with design predictions. View full abstract»

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  • Texture modeling using stochastic languages

    Publication Year: 1979 , Page(s): 60 - 65
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  • Mosaic models for textures

    Publication Year: 1979 , Page(s): 66 - 70
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    This paper deals with a class of image models based on random geometric processes. Theoretical and empirical results on properties of patterns generated using these models are summarized. These properties can be used as aids in fitting the models to images. View full abstract»

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  • A comparative texture classification study based on generalized cooccurrence matrices

    Publication Year: 1979 , Page(s): 71 - 78
    Cited by:  Papers (2)
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    A comparative study of generalized cooccurrence texture analysis tools is presented. A generalized cooccurrence matrix (GCM) reflects the shape, size and spatial arrangement of texture features. The particular texture features considered in this paper are: 1) pixel-intensity, for which generalized cooccurrence reduces to traditional cooccurrence; 2) edge-pixel; and 3) extended-edges. The best classification results, using pairs of descriptors computed from GCM's, were obtained using edge-pixel. This is consistent with the results reported in [4]. In addition, results are reported based on first-order statistics of edge-pixels and extended-edges. View full abstract»

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  • Texture discrimination based upon an assumed stochastic texture model

    Publication Year: 1979 , Page(s): 79 - 84
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    A new approach to texture discrimination is described. This approach is based upon an assumed stochastic model for texture in imagery and is an approximation to the statistically optimum maximum likelihood classifier. The construction and properties of the stochastic texture model are described and a digital filtering implementation of the resulting maximum likelihood texture discriminant is provided. The efficacy of this approach is demonstrated through experimental results obtained with simulated texture data. A comparision is provided with more conventional texture discriminants under identical conditions. The implications to texture discrimination in real-world imagery are discussed. View full abstract»

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  • Image segmentation as an estimation problem

    Publication Year: 1979 , Page(s): 85 - 91
    Cited by:  Papers (26)
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    Picture segmentation is expressed as a sequence of decision problems within the framework of a split-and-merge algorithm. First regions of an arbitrary initial segmentation are tested for uniformity and if not uniform they are subdivided into smaller regions, or set aside if their size is below a given threshold. Next regions classified as uniform are subject to a cluster analysis to identify similar types which are merged. At this point there exist reliable estimates of the parameters of the random field of each type of region and they are used to classify some of the remaining small regions. Any regions remaining after this step are considered part of a boundary ambiguity zone. The location of the boundary is estimated then by interpolation between the existing uniform regions. Experimental results on artificial picutres are also included. View full abstract»

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  • Non-stationary linear restoration of noisy images

    Publication Year: 1979 , Page(s): 92 - 99
    Cited by:  Papers (4)
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    The restoration of images degraded by an additive white noise is performed by non-stationary filtering the noisy image. The standard Wiener approach to this problem is modified to take into account the edge information of the image. Various filters of increasing complexity are derived. Experimental results are shown and compared to the standard Wiener filter results and other earlier attempts involving non-stationary filters. View full abstract»

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  • Air-fuel ratio control in the multiple cylinder engine

    Publication Year: 1979 , Page(s): 100 - 113
    Cited by:  Papers (2)  |  Patents (1)
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    Static performance of the spark ignited internal combustion engine is exmained. To achieve low pollutant levels with good fuel economy there are two engine control strategies. These are, operation at stoichiometric air to fuel ratios with a three-way catalytic converter to reduce or oxidize exhaust pollutants or operation at lean air fuel mixtures. The efficiency of three-way catalysts diminish rapidly as the mixture ratio departs from stoichiometric, while at very lean operation small variations in mixture ratio cause individual cylinders to reach the misfire or lean limit. Either strategy requires accurate control of air/fuel mixture ratio. View full abstract»

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  • Engine characterization and optimal control

    Publication Year: 1979 , Page(s): 114 - 119
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    A procedure has been developed for establisbing optimum engine performance, in terms of fuel economy and exhaust emission constraints, as a function of spark advance, exhaust gas recirculation and air-to-fuel ratio. The salient features of the procedure are: (a) it is based on mathematical engine models that have been validated over a driving cycle on an engine dynamometer, (b) it is based on solving a nonlinear programming problem with equality and inequality constraints, and (c) the results of the optimization are used to develop control calibrations that can be implemented on a vehicle. This paper describes the procedure to determine optimal calibrations for a fuel injected spark ignition engine under warmed-up operating conditions. Validation of these results on an actual vehicle has yet to be demonstrated. View full abstract»

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