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Automatic Control, IRE Transactions on

Issue 1 • Date July 1958

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Displaying Results 1 - 17 of 17
  • [Front cover]

    Publication Year: 1958 , Page(s): 0
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  • Special symposium issue

    Publication Year: 1958 , Page(s): 41
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  • The issue in brief

    Publication Year: 1958 , Page(s): 42
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  • Introduction

    Publication Year: 1958 , Page(s): 59
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  • Availability of necessary theory for the analysis and design of nonlinear systems

    Publication Year: 1958 , Page(s): 60 - 61
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  • Nonlinearities in machine tools and missiles

    Publication Year: 1958 , Page(s): 62 - 63
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  • Nonlinearity in process systems

    Publication Year: 1958 , Page(s): 63 - 64
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  • Open panel discussion

    Publication Year: 1958 , Page(s): 67 - 70
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  • Closing remarks

    Publication Year: 1958 , Page(s): 70 - 72
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  • Committee for the 1957 PGAC symposium on nonlinear control

    Publication Year: 1958 , Page(s): 73
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  • PGAC news

    Publication Year: 1958 , Page(s): 75
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  • Analytical design of linear feedback controls

    Publication Year: 1958 , Page(s): 74
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  • The practical realization of final-value systems with limiting constraints

    Publication Year: 1958 , Page(s): 49 - 50
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    In certain applications, the desired function of a control system is to control some variable accurately only at one instant of time. Examples of this can be found in homing missile guidance systems or aircraft landing systems. In the latter case, it is desired to have the vertical component of velocity be small at the instant of touchdown. Complicating features of such systems are the constraints imposed by physical limitations, such as the limited vertical acceleration capability of airplanes, and the noise or inaccuracy of measurements of the controlled variable. The optimum configuration for such systems has been derived, and this form can be used as the basis for the design of actual systems. The theoretical derivation of the optimum system idealized the actual situation, and a number of problems must be considered when the physical system is designed. Such problems as the closed-loop realization, the number of measurements of the system response, and the manner in which these measurements are utilized are discussed in this paper. View full abstract»

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  • Problems of nonlinearity in adaptive or self-optimizing systems

    Publication Year: 1958 , Page(s): 66
    Cited by:  Papers (1)
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  • The role of computers in analysis and design of control systems

    Publication Year: 1958 , Page(s): 65
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  • The design and performance of a model, second-order, nonlinear servomechanism

    Publication Year: 1958 , Page(s): 43 - 48
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    This paper discusses the design and performance characteristics of a model, second-order, nonlinear servomechanism. The design procedure stems from principles laid down in the authors' previous paper, in which the nonlinear differential equation characterizing this servo was synthesized. The physical aspects of the various building blocks needed for nonlinear servo construction are considered. Schemes for generating nonlinear functions are described, along with methods for accomplishing the multiplication and differentiation of the control system's variables. Schematic diagrams of the nonlinear servo are presented, in addition to instructions for adjusting the parameters to obtain the proper response behavior. The results of a comparison of equivalent nonlinear and linear servo operation are given in the form of photographs illustrating the control system's error response for various magnitudes of step inputs of position. The nonlinear system's error response is shown to be superior to the linear system's error response in that the nonlinear response exhibits no overshoot and reduces the system error to zero in approximately the time required for the linear system's error response to pass through zero for the first time. The response time of the nonlinear, model servo corresponds closely to the predicted response time. View full abstract»

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  • Combined hysteresis and nonlinear gains in complex control systems

    Publication Year: 1958 , Page(s): 51 - 58
    Cited by:  Papers (1)
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    The types and sources of hysteresis commonly found in mechanical systems, and some of the effects thereof, are discussed. The describing function technique as specifically applied to studying hysteresis-caused limit cycles is outlined. The use of an analog computer for studying hysteresis in servosystems is reviewed. Techniques are presented for determining active and passive compensation to eliminate or reduce hysteresis limit cycles. Finally, a method is given for analyzing hysteresis plus a single-valued nonlinearity when they occur together or apart in a single or multiloop control system. By this method it is possible to synthesize a nonlinear gain characteristic which eliminates or reduces a hysteresis limit cycle. The validity of the method is demonstrated by comparison with analog computer results. 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