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Automatic Control, IRE Transactions on

Issue 5 • Date October 1962

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  • [Front cover and table of contents]

    Publication Year: 1962 , Page(s): 0
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  • The issue in brief

    Publication Year: 1962 , Page(s): 66
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  • Correction to "Plant adaptive systems versus ordinary feedback systems"

    Publication Year: 1962 , Page(s): 119
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  • A survey of control research in U.S. engineering schools

    Publication Year: 1962 , Page(s): 126 - 129
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  • Discussion of "Stability analysis of nonlinear control systems by the second method of Liapunov"

    Publication Year: 1962 , Page(s): 129 - 131
    Cited by:  Papers (1)
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  • Discussion of "A positional servo with improved characteristics"

    Publication Year: 1962 , Page(s): 131 - 132
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  • [Back cover]

    Publication Year: 1962 , Page(s): 0
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  • A digital orthogonal model for nonlinear processes with two-level inputs

    Publication Year: 1962 , Page(s): 93 - 101
    Cited by:  Papers (2)
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    This paper describes a method by which the class of nonlinear processes with switched two-level inputs and finite settling times can be identified and an adaptive model of the process constructed. The adaptive model uses only the process input-output records. After a suitable identification time (approximately 14-70 times the settling time of the process) the model approximates the plant performance using a mean square error criteria and tracks any changes in the plant parameters. The past of the two-level input is stored in a digital shift register tapped at n points, thus forming a function space comprised of 2nnonoverlapping or orthogonal cells. By averaging the output wave-form during the time that a cell is occupied a coefficient is obtained which characterizes the output for that input condition. A basic assumption about the input waveform statistics reduces the number of characterizing coefficients from 1024 to approximately 50. The model that is evolved is a small synchronous digital computer. The model is quite versatile as it is independent of the type of process nonlinearity and can adapt to systems with different settling times. The model is ideal for use in predictive adaptive control systems where a fast time predictive model is utilized. View full abstract»

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  • An approach to self-adaptive control based on the use of time moments and a model reference

    Publication Year: 1962 , Page(s): 82 - 92
    Cited by:  Papers (3)
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    The basis of the work described in this paper is the use of the moments of the error signal resulting from a unit step input to a feedback system for the detection of changes in the characteristics of the plant. Expressions for the moments of the error in terms of moments of the input-error transfer function of the system are developed first. Then, from the relationship of the moments of the input-error transfer function to the parameters in the transfer functions of the various components of the system, a solution is obtained for those values of the adjustable parameters of an adaptive compensator that will reduce the first several moments of the error function to zero. An example is presented next, to illustrate the procedure for designing an adaptive system by the proposed method, and experimental results obtained from a system so designed are introduced to demonstrate the effectiveness of the adaptation obtainable by the use of this approach. Finally, it is concluded that the method proposed loses somewhat in effectiveness if the impulse response of the plant becomes highly oscillatory but that it has the advantage that the degree of the differential equation describing the plant need not be known. View full abstract»

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  • Guidance theory and extremal fields

    Publication Year: 1962 , Page(s): 75 - 82
    Cited by:  Papers (16)  |  Patents (2)
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    A guidance concept employing properties of optimal flight paths is developed on the basis of Jacobi's accessory minimum problem for the second variation. The analysis is equivalent to construction of a field of extremals in the neighborhood of a predetermined extremal serving as a "nominal" trajectory. In the absence of inequality constraints on the control variables, a linear terminal control scheme with time-varying gains is realized. The addition of inequality constraints leads to nonlinear control behavior. Certain propulsion system parameters are characterized as state variables as a convenient means for providing adaptive behavior in respect to in-flight changes in propulsion system performance. An application is given to an intercept problem sufficiently simple to allow analytical solution, and some numerical results comparing optimal and approximately optimal guidance in their effects on flight performance are presented. Treatment of a certain type of problem arising in rocket applications is discussed. View full abstract»

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  • Stability of a class of discrete control systems containing a nonlinear gain element

    Publication Year: 1962 , Page(s): 102 - 109
    Cited by:  Papers (6)
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    The problem considered in this paper is to find an explicit stability gain sector for a class of autonomous discrete control systems containing a nonlinear gain element. A quadratic form Lyapunov function is assumed and the Aizerman technique [1] is used to find such a stability sector. A method to select the quadratic Lyapunov function to maximize the width of the sector is suggested. View full abstract»

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  • Equivalent gain of single-valued nonlinearities with multiple inputs

    Publication Year: 1962 , Page(s): 122 - 124
    Cited by:  Papers (4)
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  • The operational solution of difference-differential equations using the modified z transform

    Publication Year: 1962 , Page(s): 124 - 125
    Cited by:  Papers (2)
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  • Optimal stochastic control

    Publication Year: 1962 , Page(s): 120 - 122
    Cited by:  Papers (4)
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  • Automatic control systems

    Publication Year: 1962 , Page(s): 132
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  • Variable frequency sampling

    Publication Year: 1962 , Page(s): 126
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  • Stochastic transformations and functional equations

    Publication Year: 1962 , Page(s): 120
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  • Let us optimize the business of making automatic control

    Publication Year: 1962 , Page(s): 65
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  • An algorithm for stochastic control through dynamic programming techniques

    Publication Year: 1962 , Page(s): 110 - 119
    Cited by:  Papers (1)
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    An algorithm based on the concept of state and dynamic programming is derived for designing an optimum controller for a linear plant subject to noise. The controller is optimal in the sense that the behavior of the plant satisfies the expected mean quadratic performance index (EMQPI) defined in the paper. The algorithm generates the sequence of control signals which minimize the EMQPI. In addition, it gives the minimum of the EMQPI for the specified sequence of control signals. The control signal is found to consist of two components: 1) a linear combination of the system state variables, and 2) a noise-balance component which minimizes the noise-induced deviation of the actual plant output from the desired output. An example is given to illustrate the iterative procedure and the asymptotic behavior of the algorithm. The design is optimal for a class of system inputs, and is applicable to both sampling and continuous systems. The design procedure is developed to make full use of a digital computer. The basic principles of dynamic programming to the treatment of stochastic control processes are clearly illustrated in an introductory form so that it will be of interest to control engineers who may wish to familiarize themselves with dynamic programming techniques. View full abstract»

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  • Vapor jet control of space vehicles

    Publication Year: 1962 , Page(s): 67 - 74
    Cited by:  Papers (2)
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    This paper describes a reaction jet attitude control technique which affords significant advantages in terms of accuracy, reliability, fuel economy and operational flexibility. These advantages are realized by the use, in combination, of low-thrust vapor jets and time-dependent on-off switching circuits. An accuracy potential comparable to inertia wheel control is thus provided, while the proverbial wheel problems of speed saturation, bearing life, threshold nonlinearities, gyroscopic coupling and vibration excitation are avoided. Very-low thrust magnitudes are attained by simply opening a small orifice to allow fuel to vaporize into the surrounding vacuum. Fuel storage, pressurization, circulation and mixing requirements are thus minimized. By augmenting conventional on-off valve switching circuitry with electronic networks that generate thrust pulses of small but constant time duration, vehicle angular rate can be controlled to a very-low threshold. This minimizes fuel consumption and valve cycling frequency. The capabilities and limitations of this design approach were substantiated by an analog computer program incorporating breadboard switching circuits, and by vacuum chamber testing of critical components. These technique and component developments are applicable to such space missions as astronomical observation, earth reconnaissance and stellar navigation. Design guides are presented for synthesizing a reaction jet system to meet any particular set of performance specifications. 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