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Automatic Control, IEEE Transactions on

Issue 2 • Date April 1966

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Displaying Results 1 - 25 of 65
  • [Front cover and table of contents]

    Publication Year: 1966 , Page(s): 0
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  • On "Mean-square reconstruction error"

    Publication Year: 1966 , Page(s): 324 - 325
    Cited by:  Papers (1)
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  • Comments on "Upper bound on dynamic quantization error in digital control systems via the direct method of Liapunov"

    Publication Year: 1966 , Page(s): 331 - 334
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  • Comment on "The frequency domain solution of regulator problems

    Publication Year: 1966 , Page(s): 334
    Cited by:  Papers (1)
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  • Astronautical guidance [Book Reviews]

    Publication Year: 1966 , Page(s): 336 - 337
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  • [Back cover]

    Publication Year: 1966 , Page(s): 0
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  • Application of Liapunov's direct method for determining stable switching boundaries in the phase plane

    Publication Year: 1966 , Page(s): 312 - 313
    Cited by:  Papers (1)
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  • Doublet pulsed control systems

    Publication Year: 1966 , Page(s): 174 - 182
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    The doublet pulsed feedback system consists of a doublet pulse modulator and a linear position follow-up system. The pulse modulator generates two pulses, an acceleration pulse, and a retarding pulse. The characteristics of the pulses are chosen so that minimum response time and stable operation are achieved. The phase plane method is used to analyze the doublet pulsed system. It is shown that an optimum adaptive contactor servo can be realized using the doublet pulsed system. The validity of approximating higher order transfer functions by a second-order function and an equivalent transportation lag is demonstrated. This enhances the application of the phase plane method to higher order systems. The analytical stipulations are proved experimentally. An experimental procedure to obtain a specified optimization of a high-order pulsed system through the doublet pulser is developed. The switching pattern and the necessary equations to design a doublet pulser are derived. View full abstract»

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  • Observers for multivariable systems

    Publication Year: 1966 , Page(s): 190 - 197
    Cited by:  Papers (305)
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    Often in control design it is necessary to construct estimates of state variables which are not available by direct measurement. If a system is linear, its state vector can be approximately reconstructed by building an observer which is itself a linear system driven by the available outputs and inputs of the original system. The state vector of an n th order system with m independent outputs can be reconstructed with an observer of order n-m . In this paper it is shown that the design of an observer for a system with M outputs can be reduced to the design of m separate observers for single-output subsystems. This result is a consequence of a special canonical form developed in the paper for multiple-output systems. In the special case of reconstruction of a single linear functional of the unknown state vector, it is shown that a great reduction in observer complexity is often possible. Finally, the application of observers to control design is investigated. It is shown that an observer's estimate of the system state vector can be used in place of the actual state vector in linear or nonlinear feedback designs without loss of stability. View full abstract»

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  • A set of stability constraints on the denominator of a sampled-data filter

    Publication Year: 1966 , Page(s): 327 - 328
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  • Weighted performance criteria for the synthesis of discrete systems

    Publication Year: 1966 , Page(s): 277 - 281
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    For the free and forced motion of an asymptotically stable linear stationary discrete control system of order k , Performance Indexes given by the general expressions \Sigma \min{n=0}\max {\infty } c(n)x_{(l)}(n) and \Sigma \min{n=0}\max {\infty } c(n)\Delta ^{m}x_{(l)}(n) where c(n) is any z -transformable function, x_{(l)}(n) is a vector whose elements are products of the state variables of the system in the form frac{l!}{a!b!...h!}x_{1}^{a}(n)x_{2}^{b}(n) ... x_{k}^{h}(n);a + b + ... + h = ! and Δmis the m th forward difference, can be computed from the system's parameter without obtaining an explicit solution of the response. This is achieved by the introduction of a matrix L formed in a certain manner from the system's matrix A and the introduction of a "Matrix z -transform" C[(L'+ I)] of c(n) . View full abstract»

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  • Use of convolution integral in sampled-data theory

    Publication Year: 1966 , Page(s): 328 - 329
    Cited by:  Papers (1)
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  • Experimental study of phase-angle controlled magnetic amplifier

    Publication Year: 1966 , Page(s): 264 - 272
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    Magnetic amplifiers can be rendered phase sensitive with the aid of phase-sensitive rectifiers [1]. In the present study phase sensitivity was effected directly, without recourse to an additional device with a phase-sensitive characteristic. It is shown that conventional two-core amplifiers, with one load winding and one control winding only on each core, are made phase sensitive by application of a phase-dependent ac rectified signal. Experiments were carried out with a signal derived from supply voltage for the load circuit and obtainable from any phase-shifting device (selsyn, resolver). In conjunction with the even-harmonic voltage produced at the control-coil terminals by the nonlinearity of the core characteristic, it results in phase-angle dependence of the even harmonic no-load voltage. Intrinsic feedback on the control side (and in certain cases feedback from the load circuit) gives the amplifier its phase-angle dependent current characteristic. If a pair of identical amplifiers are used with the control signal originating from different phases, zero current and phase reversal are obtainable at the output. Similarly, dc output with a directional characteristic is obtainable by transferring the load to the control circuit and connecting the load circuit of the two amplifiers to different phases of the supply source, the signal source being single-phase in this case. Load feedback, added to the intrinsic feedback of the control side, permits a current jump at a certain predetermined phase angle, so that the system operates like a switch; this jump can be reversed by opening the load feedback circuit. In the Appendix, an approximation is derived for the even-harmonic no-load voltage as function of the phase angle of the signal. This can be used as Thévenin voltage, and the calculation continued in the conventional way [2], [3]. View full abstract»

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  • Issue in brief

    Publication Year: 1966 , Page(s): 158 - 160
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  • On the stability of a zero-output system

    Publication Year: 1966 , Page(s): 315 - 316
    Cited by:  Papers (5)
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  • Inertial navigation systems

    Publication Year: 1966 , Page(s): 337
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  • Sequential minimax estimation

    Publication Year: 1966 , Page(s): 323 - 324
    Cited by:  Papers (1)
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  • On the maximum priciple for nonlinear discrete-time systems

    Publication Year: 1966 , Page(s): 273 - 274
    Cited by:  Papers (7)
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    It was shown in a previous paper that Halkin's maximum principle for difference equations linear in the state could be generalized by relaxing a convexity requirement to directional convexity. We show here that Halkin's results for difference equations not necessarily linear in the state may also be generalized. The new proof uses some rather simple arguments. The proof is based on a condition characterizing the optimal solution. This condition may be used to strengthen the maximum principle in the abnormal case. View full abstract»

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  • Astronautical guidance

    Publication Year: 1966 , Page(s): 337
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  • A method of system identification using sinusoidal signals

    Publication Year: 1966 , Page(s): 322 - 323
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  • A note on the generalized Nyquist criterion

    Publication Year: 1966 , Page(s): 317
    Cited by:  Papers (2)
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  • Implementation of optimum sampled-data control

    Publication Year: 1966 , Page(s): 274 - 277
    Cited by:  Papers (1)
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    This paper is a brief description of the development of simple hybrid sampled-data controllers. The control function generated is amplitude-constrained and is approximately optimum with respect to a given quadratic performance index. The plant controlled is linear with accessible state variables and is sampled with constant period. An optimum controller for a free-terminal-state plant is designed. Quasi-optimum controllers for a fixed-terminal-state plant are designed and tested. The third-order plant 1/[s(s+0.2)(s+1)] is simulated on an analog computer and controlled by each of the quasi-optimum controllers. View full abstract»

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  • A class of hybrid-state continuous-time dynamic systems

    Publication Year: 1966 , Page(s): 161 - 167
    Cited by:  Papers (35)
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    A class of continuous time systems with part continuous, part discrete state is described by differential equations combined with multistable elements. Transitions of these elements between their discrete states are triggered by the continuous part of the state and not directly by inputs. The dynamic behavior of such systems, in response to piecewise continuous inputs, is defined under suitable assumptions. A general Mayer-type optimization problem is formulated. Conditions are given for a solution to be well-behaved, so that variational methods can be applied. Necessary conditions for optimality are stated and the jump conditions are interpreted geometrically. View full abstract»

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  • Optimal control with bounded control effort

    Publication Year: 1966 , Page(s): 311
    Cited by:  Papers (1)
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  • Transformation of time-variable systems to canonical (phase-variable) form

    Publication Year: 1966 , Page(s): 300 - 303
    Cited by:  Papers (63)
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    The problem of transforming a single-input, single-output, time-variable linear system to phase-variable form is considered in this paper. Specific criteria for the existence of an equivalent canonical form are derived together with a method for obtaining the form when it exists. This method, when specialized to fixed systems, is particularly simple, and results in an easilyconstructed explicit form for the transforming matrix. Furthermore, the calculation of eigenvalues and eigenvectors necessary in previously published techniques is avoided. View full abstract»

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Aims & Scope

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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Meet Our Editors

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