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Automatic Control, IRE Transactions on

Issue 1 • Date December 1958

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Displaying Results 1 - 13 of 13
  • [Front cover and table of contents]

    Publication Year: 1958 , Page(s): 0
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  • New features

    Publication Year: 1958 , Page(s): 77
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  • Issue in brief

    Publication Year: 1958 , Page(s): 78
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  • The PGAC administrative committee

    Publication Year: 1958 , Page(s): 116
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  • Operations research for computer control

    Publication Year: 1958 , Page(s): 122 - 123
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  • Contributors and back cover

    Publication Year: 1958 , Page(s): 0
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  • Feedback system testing

    Publication Year: 1958 , Page(s): 79 - 88
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    An analog method of servo system performance testing applicable to experimental analysis and system development and to go-no-go production and maintenance tesfiug has been devised. For a servo system with a forward transfer function Geoand a feedback transfer function Gouthe loop actuating signal equals the loop input signal divided by 1+G_{eo}G_{ou} . The loop actuating signal becomes exactly equal to a test signal if the test signal is multiplied by the factor 1+G_{eo}G_{ou} before application to the servo system. The difference between the loop actuating signal of the closed-loop servo system and the arbitrary test signal is continuously zero for the system exactly meeting the specification G_{eo}G_{ou} function simulated in the signal generator. Sinusoidal testing methods are most effective with the servo system loop open. Transient testing (single-event time-domain input) is usually performed on servo systems with the loop closed. The analog method described, as distinguished from transient and sinusoidal methods, uses time-domain signals (a step-function signal generator input is found suitable) to obtain frequency-domain parameters in a method effectively making an open-loop test of a closed-loop servo system. The 1+G_{eo}G_{ou} signal generator is conveniently realized using an analog computer of the operational amplifier type. An alternative mechanization of the signal generator uses only passive elements. Nonlinear as well as linear servo systems may be tested by the method. Single-integrator, angle tracking, and range-tracking servo systems have been analyzed. The range-tracking transfer function was employed in an analog computer experiment. Recordings of both the loop actuating signal and the difference between the loop actuating signal and the signal generator input were made for 0, ± 6 db, and ± 12 db departures from correct gain and for 0, ± 1, and ± 2 octave departures from correct corner frequency. A study of these recordings revealed potentialities for control of adaptive servo systems. View full abstract»

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  • Stability of forced oscillations in nonlinear feedback systems

    Publication Year: 1958 , Page(s): 109 - 111
    Cited by:  Papers (5)
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    It has been known for a considerable time that non-linear systems may exhibit multivalued response under external periodic excitation. The stability of these forced oscillations has been extensively investigated for second-order systems and a general criterion for their stability was found. Stability of higher order systems was investigated by means of the incremental describing function. This function must be calculated for every case of interest. In this paper the general criterion formerly derived for second-order systems is extended to higher order systems. Thus it is not necessary to make a special stability investigation in every case. View full abstract»

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  • A selective bibliography on sampled data systems

    Publication Year: 1958 , Page(s): 112 - 114
    Cited by:  Papers (2)
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    References have been compiled on the synthesis and analysis of sampling servo systems as differentiated from continuous servo systems. No attempt has been made to cover material before 1955 except where particular references have been cited by various authors repeatedly, indicating "classic" references in this comparatively new area of feedback control system literature. Items are listed alphabetically by author. View full abstract»

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  • Analysis of gyro orientation

    Publication Year: 1958 , Page(s): 93 - 101
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    The frequency response of a gyro-stabilized platform is limited by the gyros. For the most effective suppression of instability with a minimum sacrifice in bandwidth, it is necessary to orient single-degree-of-freedom gyros in a certain way. Methods of orientation are discussed in this paper. View full abstract»

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  • A survey of adaptive control systems

    Publication Year: 1958 , Page(s): 102 - 108
    Cited by:  Papers (34)
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    The various criteria upon which self-optimizing systems have been based are reviewed, and the operation of each type of system is discussed. A new system which is self-optimizing with respect to a measure of impulse response is described, and experimental results are presented. View full abstract»

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  • Standard terminology

    Publication Year: 1958 , Page(s): 122
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  • Considerations in phase shifting

    Publication Year: 1958 , Page(s): 89 - 92
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    The problem of phase shifting is investigated from an ideal viewpoint. The different possibilities of obtaining quadrature voltages at the terminals of an ac servomotor with static impedance elements, connected to the reference winding, are discussed together with the limiting restrictions for each. Formulas for specifying elements of the phase shifting impedance are given in terms of motor constants for several of the more common impedance configurations. View full abstract»

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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