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Automatic Control, IRE Transactions on

Issue 1 • Date Jan. 1960

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Displaying Results 1 - 15 of 15
  • Table of contents

    Publication Year: 1960 , Page(s): 1 - 2
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  • Foundations of control

    Publication Year: 1960 , Page(s): 1
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  • The issue in brief

    Publication Year: 1960 , Page(s): 2
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  • The International Federation of Automatic Control

    Publication Year: 1960 , Page(s): 3 - 5
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    The initials IFAC, standing for the International Federation of Automatic Control, are appearing more and more in the control systems literature these days. It is appropriate that readers of these TRAHSACTIONS be more fully aware of this organization in which they participate through the IRE's membership in the American Automatic Control Council. What are IFAC's purposes, who are its members, how does it operate, what has it accomplished? Now, after two years of existence for IFAC, these data are better known and have more significance. View full abstract»

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  • Dynamic programming and adaptive processes: Mathematical foundation

    Publication Year: 1960 , Page(s): 5 - 10
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    In many engineering, economic, biological, and statistical control processes, a decision-making device is called upon to perform tinder various conditions of uncertainty regarding underlying physical processes. These conditions range from complete knowledge to total ignorance. As the process unfolds, additional information may become available to the controlling element, which then has the possibility of “learning” to improve its performance based upon experience; i.e., the controlling element may adapt itself to its environment. On a grand scale, situations of this type occur in the development of physical theories throgh the mutual interplay of experimentation and theory; on a smaller scale they occur in connection with the design of learning servomechanisms and adaptive filters. The central purpose of this paper is to lay a foundation for the mathematical treatment of broad classes of such adaptive processes. This is accomplished through use of the concepts of dynamic programming. Subsequent papers will be devoted to specific applications in different fields and various theoretical extensions. View full abstract»

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  • The properties and methods for computation of exponentially-mapped-past statistical variables

    Publication Year: 1960 , Page(s): 11 - 17
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    The exponentially-mapped-past (emp) statistical variables represent an approach to the statistical analysis of a process when the interest is focused on the recent behavior of the process. An exponential weighting function, decreasing into the past, in the case of continuously observed processes, and a geometric ratio, in the case of discrete data, are utilized. This approach is the simplest from the point of view of ease of computation, and at the same time it possesses the advantage of some simple theoretical relationships, which are discussed. Analog computer circuits and digital computer flow diagrams which serve to compute the exponentially-mapped-past statistical variables are presented. View full abstract»

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  • Generalized weighting function and restricted stability of a linear pulse-modulated error feedback system

    Publication Year: 1960 , Page(s): 18 - 24
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    A generalized weighting function is obtained for a linear feedback system with a pulse-modulated error signal. This is expressed in the form of a matrix operator acting on an input vector, the components of which are the first R − 1 derivatives of the input, where R is the order of the unmodulated closed-loop system. In addition, since the system operator takes the form of a finite dimensional matrix, it has been possible to make and realize more stringent conditions on the transient stability; namely, a preassigned bounded output after a preassigned time. Although the solution has been obtained generally for non-uniform pulsing, the latter stability investigation has been made only for the uniform case. View full abstract»

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  • Optimization based on a square-error criterion with an arbitrary weighting function

    Publication Year: 1960 , Page(s): 24 - 30
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    Several important criteria for the performance of communication systems and control systems are reviewed, and a new criterion (the mean-weighted-square-error criterion) is then introtroduced. This is shown to be a special form of a very general criterion proposed earlier, but to have special significance in that it is a generalization of the familiar mean-square-error criterion. The minimization of the mean-weighted-square error is treated in detail, and a solution for the optimum physically realizable frequency function of the system is given. View full abstract»

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  • Multiple-rate sampled-data systems

    Publication Year: 1960 , Page(s): 30 - 31
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    The characterization of multiple-rate sampled-data systems by the ordinary z-transform of single-rate systems is shown. Single-rate sampling, or impulse modulation, of continuous signals is performed by an impulse modulator, M; the sampled, or “starred,” function is described by the z-transform. In an analogous manner, a submultiple-rate modulator is introduced; its presence in a branch allows the passage of every nth pulse, or a train of pulses at a submultiple rate; the nomenclature of single-rate systems is continued through the performance of submultiple-rate “starring” of discrete signals and discrete niters. Table I permits starred expressions to be rewritten as functions of the z-transform in closed form. Techniques are shown for the reduction of discrete, and mixed continuous and discrete systems via flow graphs, so that, after the modulators are removed from the feedback loops, the analysis may proceed by standard methods. Representation of single-and submultiple-rate modulation in the s- and z-planes is used to demonstrate that submultiple-rate modulation of discrete signals is analogous to the impulse modulation of continuous signals. View full abstract»

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  • Automatic control of three-dimensional vector quantities — Part 2

    Publication Year: 1960 , Page(s): 38 - 57
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    In Part 1 of this paper13 a vector algebra was developed using a three-element column matrix to represent the vector, and a three-by-three matrix to represent a vector transformation operator. Problems in spherical trigonometry were analyzed with the use of a position vector, and the design of automatic computers to solve such problems was considered. In Part 2, the angular velocity vector is introduced for the purpose of analyzing and designing geometric stabilization systems. View full abstract»

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  • Root locus properties and sensitivity relations in control systems

    Publication Year: 1960 , Page(s): 57 - 65
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    The differential properties of root loci including pole sensitivity, angle of slope, and curvature at ordinary and irregular points are investigated in a unified manner. A relation between the sensitivity function and pole sensitivity is established. The sensitivity is shown to determine variations in the transfer function due to large (not only infinitesimal) variations in K. Additional properties of loci which are developed include loci of a variable pole position and the existence of asymptotes for open-loop transfer functions with the poles or zeros at infinity. The locus is treated as a transformation of a line (the real axis) in the K plane to the s plane, and properties of analytic functions are used to simplify calculations and results. It is shown that the properties obtained can be extended to the general root locus of a nonreal K. View full abstract»

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  • Time lag systems — A bibliography

    Publication Year: 1960 , Page(s): 66 - 70
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    In a recent issue of these Transactions, Weiss1 has given an excellent annotated bibliography on the subject of transportation lag. He was kind enough to refer to a previous bibliography which appeared in this author's thesis (his reference number [Ch 5]). Since the latter is not generally available, the bibliography therein is given here. The items which have already appeared in Weiss' listing have been omitted; items which have appeared since the thesis was written have been included. While most of the items here were found by library searches, acknowledgment must be made to Bellman's2 bibliographies as a source. If there are items which have not been mentioned either here or in Weiss' paper, the author of the present paper would appreciate being informed about it by either a complete reference or a copy of the paper (or papers) in question. A short introduction on the mathematical characterization of time lag systems is given before the bibliography. View full abstract»

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  • Correspondence

    Publication Year: 1960 , Page(s): 71 - 72
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  • Contributors

    Publication Year: 1960 , Page(s): 73
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  • PGAC news

    Publication Year: 1960 , Page(s): 75 - 76
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Aims & Scope

The theory, design and application of Control Systems. It shall encompass components, and the integration of these components, as are necessary for the construction of such systems. The latest title for this publication is IEEE Transactions on Automatic Control.

 

This Transactions ceased publication in 1958. The current retitled publication is IEEE Transactions on Automatic Control.

Full Aims & Scope