Showing papers in "IFAC Proceedings Volumes in 1975"
••
TL;DR: The content of main theorems on singular perturbations is presented in a tutorial form aimed at a broad audience of engineers and applied mathematicians interested in control, estimation and optimization of dynamic systems.
198 citations
••
TL;DR: In this paper, a necessary and sufficient condition of stability for the feedback system is expressed in algebraic form and all compensators R stabilizing the system are found, and an interesting physical interpretation of the stability condition is given in terms of mode cancellations between the F and R.
134 citations
••
TL;DR: In this paper, the authors considered the robust control of a completely general servo-mechanism problem and provided necessary and sufficient conditions, together with a characterization of all robust controllers which enable asymptotic tracking to occur, independent of disturbances in the plant and perturbations in the parameters and gains of the system.
76 citations
••
TL;DR: In this article, the macroscopic ctability of interconnected systems is introduced, which is characteristic to a class of large-scale and dynamic systems, and conditions which insure macro-scopic stability are obtained on the basis of comparison principles for differential inequalities.
65 citations
••
TL;DR: In this paper, the output nulling invariant and controllability subspaces of a finite-dimensional linear system with a transfer function matrix that is not necessarily zero for infinite frequencies are studied.
51 citations
••
TL;DR: This paper studies the effects of decentralized feedback on the closed-loop properties of jointly controllable, jointly observable k-channel linear systems and shows completeness to be a generic property of systems with strongly connected graphs.
50 citations
••
TL;DR: In this article, the authors describe state of the art on optimum design of systems based on reliability effectiveness, and describe a general design philosophy and methodology that may be found useful for designing reliable systems.
47 citations
••
TL;DR: In this article, a new approach to the stability analysis of large scale power systems using vector Lyapunov functions is introduced, by decomposing the composite power system into a number of low-order subsystems, and using this function together with the stability properties of individual subsystems and the nature of interactions between subsystems criteria for the stability of the overall system are derived.
43 citations
••
TL;DR: The results discussed highlight the operational aspects of multiplier methods and demonstrate their significant advantages over ordinary penalty methods.
42 citations
••
TL;DR: In this paper, a brief survey of progress in the scientific analyses of human capabilities, limitations, needs and motivations is given, and experimental techniques specific to the social sciences are touched upon.
34 citations
••
TL;DR: The present work reformulates MDP in terms of free polynomial modules and gives an improved two-step MDP Algorithm, providing a complete solution including existence and effectively eliminating the first of Forney's three steps.
••
TL;DR: In this paper, the authors describe several areas where supervisory control is becoming applied, discuss the various roles of the supervisor, and review theoretical considerations to be considered in modeling these roles.
••
TL;DR: In this article, it was shown that a linear analytic system can be realizable by a Volterra series, provided that there is no finite escape time, and necessary and sufficient conditions for this to be the case.
••
TL;DR: Vector optimization problems are considered, where the solutions, constraints and performance are elements of linear topological spaces and a partial pre-ordering in performance space is implied by a positive cone.
••
TL;DR: In this article, a method for online process identification in noisy closed loops using correlation and least squares parameter estimation is developed. But the method is not suitable for recursive data processing and it is only suitable for process computers.
••
TL;DR: In this paper, the authors raise a few ideas on "Systems Engineering Methodology" and discuss the importance of the training of engineers not only in technics, but also in methodology so that they can make the right choices in design methods.
••
TL;DR: In this paper, the authors deal with the construction of Lyapunov functions for the finite dimensional linear system ẋ = Ax when the entries of the generating matrix A satisfy various conditions requiring dominance of its diagonal elements and nonnegativity of its off-diagonal elements.
••
TL;DR: In this paper, a feedback-feedforward control system with a Luenberger type state observer for the activated sludge process applied to biological wastewater treatment is studied. But it turns out that only little improvement can be gained by a system whose control variable is the recycle flow rate.
••
TL;DR: The decentralized stochastic control of a linear dynamic system consisting of several subsystems is considered by the introduction of a coordinator who collects measurements from the local controllers periodically and in return transmits coordinating parameters.
••
TL;DR: In this article, the problem of providing loop stability and output regulation in the presence of small perturbations in system parameters is considered, and it is shown that structural stability requires feedback of the regulated variable, and a reduplicated model in the feedback path of the dynamic structure of the reference and disturbance signals which the regulator is required to process.
••
TL;DR: In this article, a graph-theoretic approach is followed to develop a decompositional tool which exploits the structure of directed graphs associated with large dynamic systems described as a combination of non-linear ordinary differential and algebraic equations.
••
TL;DR: How the Bayesian approach can be applyed to the global optimization of multiextremal functions is described and the example of application to the planning of extremal experiments is discussed.
••
TL;DR: In this article, the authors examined geometrical properties of both minimal and non-minimal systems and showed that the answer is generally yes in the single-input/single-output case, and generally no in the multivariable case.
••
TL;DR: Based on recent experimental and numerical work, one must conclude that the practical application of distributed parameter state estimation techniques to process control, environmental monitoring, and energy recovery problems shows real promise.
••
Enel1
TL;DR: The sensitivity of the characteristic roots of a linear time-invariant dynamic system, versus parameter perturbations, may be defined in terms of the transfer matrix residuals as discussed by the authors.
••
TL;DR: In this article, a self-tuning regulator is proposed to simplify the design of regulators for industrial processes, which can serve as a substitute for the time-consuming process of plant experiments, parameter estimation and control design.
••
TL;DR: In this paper, feedback Stackelberg strategies are considered for two-person linear multi-stage games with quadratic performance criteria and noisy measurements, and explicit solutions are given when the information sets are nested; the solutions are closely related to the separation theorem of stochastic control.
••
TL;DR: In this paper, the authors investigated the effect of the identification method used, the model structure used and the input signal generation on the accuracy of the estimates obtained from data from an identification experiment and showed that closed loop experiments can give better accuracy than open loop experiments.
••
TL;DR: In this paper, an adaptive time-optimal closed-loop algorithm is presented which is insensitive to stochastic disturbances (e.g. wind forces) and to parameter variations such as rope movement.
••
TL;DR: In this article, the authors use pattern features as a basis for adaptation, direct control, and theoretical studies using pattern recognition as a means for allowing a computer system to characterize transient response and to compute readapted parameters which cause the control behavior to approach a desired transient "shape".