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Automatic Control, IEEE Transactions on

Issue 4 • Date October 1963

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Displaying Results 1 - 25 of 31
  • [Front cover and table of contents]

    Publication Year: 1963 , Page(s): 0
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  • Questions - Let there be answers

    Publication Year: 1963 , Page(s): 275 - 276
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  • The issue in brief

    Publication Year: 1963 , Page(s): 277 - 278
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  • The analysis of nonlinear closed-loop systems with memory and Gaussian exitation

    Publication Year: 1963 , Page(s): 383 - 384
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  • Equivelent gain of single-valued nonlinearities with multiple inputs

    Publication Year: 1963 , Page(s): 385 - 386
    Cited by:  Papers (1)
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  • Further discussion of "Verification of Aizemańs conjecture for a class of third-order systems"

    Publication Year: 1963 , Page(s): 386
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  • Comments on "A unified approach to synthesis of linear systems"

    Publication Year: 1963 , Page(s): 386
    Cited by:  Papers (1)
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  • Clarification of "The existence of optimal control for a class of optimization problems"

    Publication Year: 1963 , Page(s): 387
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  • [Back cover]

    Publication Year: 1963 , Page(s): 0
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  • Phase and amplitude sinusoidal dither adaptive control system

    Publication Year: 1963 , Page(s): 311 - 321
    Cited by:  Papers (4)  |  Patents (1)
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    In many control system applications an adaptive system is required to accommodate changes in plant dynamics. A self-adaptive system described herein adjusts two control system parameters to maintain the closed-loop response essentially constant in spite of large changes in the plant gain and pole-zero locations. The adaptive system uses a high-frequency dither frequency to interrogate the state of the control system. Two self-adaptive performance criteria (SAPC) adjust the two adaptive parameters. One SAPC is based upon the amplitude response to the dither frequency and the other is based upon the phase response. The adaptive loop associated with the amplitude SAPC adjusts the control system loop gain; the adaptive loop associated with the phase SAPC adjusts a variable compensation network. A method is developed for analyzing the stability and performance of the self-adaptive parameter adjustment loops. The stability analysis includes the interaction between these adaptive loops. This two-parameter adaptive system is applied to a specific example to illustrate the techniques developed in the paper. View full abstract»

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  • Synthesis of a class of linear feedback minimum energy controls

    Publication Year: 1963 , Page(s): 376 - 378
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  • Some fundamental aspects of process-parameter estimation

    Publication Year: 1963 , Page(s): 347 - 357
    Cited by:  Papers (27)
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    The purpose of this paper is to give a coherent picture of the process-parameter estimation. It offers a philosophy by introducing a "generalized model." From this, two classes of schemes can be derived. In each class there is quite some freedom with respect to the choice of elements of the scheme, the choice of the error criterion, and the choice of signal representation (continuous, sampled, quantized, etc.). These choices account for a whole range of estimating systems. The dynamic properties of many of these systems can be studied by the approach presented in this paper. The extension to estimation of nonlinear processes is also discussed. View full abstract»

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  • Stability of certain nonlinear differential equations

    Publication Year: 1963 , Page(s): 381 - 382
    Cited by:  Papers (3)
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  • Theory and applications of the pole-zero analog computer

    Publication Year: 1963 , Page(s): 327 - 332
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    This paper describes an all-electronic analogue of the complex plane in which singularities are positioned by potentiometor settings. Although the basic principle is old, a new method of determining the argument of a function is presented and its implementation discussed. A machine called the Pole-Zero Analogue Computer was constructed to test the method and perform various operations such as the plotting of root loci, Nichols loci and equipotential lines. Other functions which can be performed include the plotting of magnitude, logarithmic-magnitude, phase-slope and phase characteristics of filters or linear systems in general. All of these applications are discussed and test results are presented. View full abstract»

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  • Time-optimal rendezvous strategies

    Publication Year: 1963 , Page(s): 279 - 283
    Cited by:  Papers (4)
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    This paper is concerned with the control of two distinct n th-order linear systems described in the standard state vector notation. Since both systems are of n th order their state vectors can be placed in the same n -dimensional phase space. A problem is formulated in which it is desired to transfer each system from separate initial states to some undetermined but coincident state (state vector rendezvous). This goal is to be accomplished in minimum time while the input vectors of both systems are amplitude constrained. Complete necessary and sufficient conditions which must be satisfied by time-optimal solutions are developed, and additionally, a technique for computing the optimum controls is given. View full abstract»

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  • Minimization of reactor noise through external control

    Publication Year: 1963 , Page(s): 366 - 370
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    An analytical approach based on the work of Wiener is taken to develop an expression for an optimum linear feedback control system that will minimize the random variations in the flux of a nuclear power reactor. The optimization criterion is the minimization of the mean-square value of these random variations. In determining the optimum control system transfer function, an acceleration constraint is placed on the control-rod drive mechanism. To demonstrate the technique presented, an optimum control system transfer function is derived for the experimental boiling water reactor (EBWR) under specified operating conditions. The changes in the mean-square value of reactor flux caused by varying acceleration constraint level is discussed. Results show that a considerable reduction in the mean-square value of the random flux variations can be obtained through external control. View full abstract»

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  • Time-optimal control for a class of nonlinear systems

    Publication Year: 1963 , Page(s): 379
    Cited by:  Papers (2)
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  • Solutions to the linear smoothing problem

    Publication Year: 1963 , Page(s): 371 - 372
    Cited by:  Papers (44)  |  Patents (2)
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  • A method for the design of phase-lead demodulating compensators for use in carrier control systems

    Publication Year: 1963 , Page(s): 333 - 338
    Cited by:  Papers (2)
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    A fairly new type of compensator for carrier control systems consists of a passive electric network that contains one or more periodically-conducting branches. This type of compensator (referred to as a demodulating compensating network) is superior to other types, used previously, in terms of size, weight, cost, and sensitivity to variations in carrier frequency. Although a detailed analysis of the operation of a demodulating compensating network is usually very tedious, it is possible to describe the effect of such a network in a feedback control system very simply by the use of an equivalent time-invariant passive electric network. A procedure for designing a phase-lead demodulating compensating network to meet specifications on system performance is presented in this paper. In essence, this procedure consists of the following steps. First, the uncompensated frequency response of the system is examined. Then an acceptable and realizable phase and/or gain characteristic is selected. Finally, by the use of design curves, the parameters of the demodulating compensator required to provide the desired frequency response are determined. Numerical examples are included to illustrate the application of the design procedure, and experimental results are reported to reveal the value of the procedure. View full abstract»

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  • Geometric properties and optimal controllers for linear systems

    Publication Year: 1963 , Page(s): 379 - 381
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  • The approximate determination of periodic regimes in systems containing relay elements with dead zones

    Publication Year: 1963 , Page(s): 292 - 296
    Cited by:  Papers (1)
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    The problem of finding periodic solutions of relay (or "flip-flop") systems with dead zones is considered. A method for approximating such solutions is offered here, in which the original problem is reduced to a similar problem for an ideal relay system. The reduction is effected by "sloppy superposition," i.e., by modification of the principle of convex superposition in piecewise-linear systems. A successful application and a possible extension of the method are mentioned briefly. View full abstract»

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  • The construction of Liapunov functions

    Publication Year: 1963 , Page(s): 382 - 383
    Cited by:  Papers (3)
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  • Multivariable controller design by signal-flow graph techniques

    Publication Year: 1963 , Page(s): 283 - 292
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    This paper describes a series of systematic steps to synthesize a multivariable controller. It is a particularly useful technique when there is required partial or full noninteraction in conjunction with invariance of certain of the outputs with respect to disturbance vectors. This is a structure oriented method where the critical plant parameters and variables are reflected in the controller structure. The resulting controller structure permits a simple final field adjustment of controller parameters during the initial operation period. In addition, these same properties allow adaptive methods that require adjustment of very few of the parameters in response to environmental or plant changes. The problems of physical realization of controller elements and of achieving the desired control specifications are handled by a technique that may operate on the structure as it is derived. These operations clearly show the alternatives available, both in structuring and in realizing elements. These features indicate that algorithms to aid the design procedure would be quite possible for use on digital computers. View full abstract»

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  • Arbitrary non-mean-square error criteria

    Publication Year: 1963 , Page(s): 375 - 376
    Cited by:  Papers (1)
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  • A deterministic study of delta modulation

    Publication Year: 1963 , Page(s): 339 - 347
    Cited by:  Papers (1)  |  Patents (1)
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    Delta modulation has often been viewed as a type of PCM and has been analyzed by probabilistic methods. This paper views delta modulation as a hybrid PDM/PAM system. A nonlinear feedback model is constructed and subjected to digital computation on an IBM 650. Computation is enabled by trapezoidal convolution, an approximate Z -transform method for solving dynamical systems. Responses to various steps and ramp inputs for unity and nonunity feedback are considered. Dead space is also introduced into the nonlinearity in the forward link. A series of computer runs is condensed and observations are reported. A typical observation is that a trade-off exists between average error and noise and that both may not be minimized by any one of two versions of the delta modulator. View full abstract»

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In the IEEE Transactions on Automatic Control, the IEEE Control Systems Society publishes high-quality papers on the theory, design, and applications of control engineering.  Two types of contributions are regularly considered

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Editor-in-Chief
P. J. Antsaklis
Dept. Electrical Engineering
University of Notre Dame