Bifurcations, Chaos and Control I

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Author Index
A B C D E F G H I
J K L M N O P Q R
S T U V W X Y Z

Normal Forms And Bifurcations Of Control Systems

Authors:

Dong-Eui Chang, Wei Kang, Arthur J. Krener,

Volume: 1, Page 1602 Paper number 1701

Abstract:

We present the quadratic and cubic normal forms of a nonlinear control system around an equilibrium point. These are the normal forms under change of state coordinates and invertible state feedback. The system need not be linearly controllable. A control bifurcation of a nonlinear system occurs when its linear approximation loses stabilizability. We study some important control bifurcations, the analogues of the classical fold, transcritical and Hopf bifurcations.

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Enhancing Detectability Of Bifurcations In DC-DC Converters By Stochastic Resonance

Authors:

Priya Ranjan, Eyad H. Abed,

Volume: 1, Page 1608 Paper number 1702

Abstract:

Noise-driven systems tend to display special features in their power spectra when approaching bifurcation or instability. These features, called noisy precursors, can be of significant use since they can serve as a warning signal for the impending loss of stability. Another phenomenon that has received significant attention in the mathematical physics and biology literature is that of stochastic resonance. In stochastic resonance, the signal-to-noise ratio (SNR) is nonmonotonic with respect to noise level. This cannot occur in linear systems. Most past studies of stochastic resonance involve bistable systems with a weak external periodic forcing. However, recently the same basic phenomenon has been observed in autonomous systems operating along a limit cycle. In any case, the combination of precursors and stochastic resonance provides a tool for instability monitoring. In this paper, these observations are applied to a discrete-time DC-DC converter model. Precursors of period doubling instability are shown to occur. Also, stochastic resonance and its impact on precursor strength is demonstrated. The calculations show how the noise level should be selected to enhance detectability of the impending bifurcation.

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A Geometric Perspective on Bifurcation Control

Authors:

Yong Wang, Richard M. Murray,

Volume: 1, Page 1613 Paper number 1704

Abstract:

In this paper, we analyze the problem of bifurcation control from a geometric perspective. Our goal is to provide coordinate free, geometric conditions under which control can be used to alter the bifurcation properties of a nonlinear control system. These insights are expected to be useful in understanding the role that magnitude and rate limits play in bifurcation control, as well as giving deeper understanding of the types of control inputs that are required to alter the nonlinear dynamics of bifurcating systems. We also use a model from active control of rotating stall in axial compression systems to illustrate the geometric sufficient conditions of stabilizability.

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Dynamic Feedback Control of Bifurcations

Authors:

Hua O. Wang, Dong S. Chen, Linda G. Bushnell,

Volume: 1, Page 1619 Paper number 1705

Abstract:

Bifurcation control deals with the modification of the bifurcation characteristics of a parameterized nonlinear system by a judiciously designed control input. In this paper, we consider the problem of dynamic feedback control of bifurcations. In particular, previous results on the control of bifurcations using washout filters are extended to some general forms of dynamic feedback controllers. It is shown that high-pass filters such as washout filters can be represented by a special form of dynamic feedback controller. The control effect on bifurcations can be readily assessed by analytical formulae. These dynamic feedback controllers offer more flexibility over the original controller in bifurcation control. The results are viable for the design and analysis of nonlinear control systems involving bifurcations.

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Normal Forms, Canonical Forms, and Invariants of Single Input Nonlinear Systems Under Feedback

Authors:

Issa Amadou Tall, Witold Respondek,

Volume: 1, Page 1625 Paper number 1707

Abstract:

We study the feedback group action on single-input nonlinear control systems. We follow an approach of Kang and Krener based on analysing, step by step, the action of homogeneous transformations on the homogeneous part of the system. We construct a dual normal form and dual invariants with respect to those obtained by Kang. We also propose a canonical form and show that two systems are equivalent via a formal feedback if and only if their canonical forms coincide. We give an explicit construction of transformations bringing the system to its normal, dual normal, and canonical form.

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On The Control Of Hopf Bifurcations

Authors:

Boumediene Hamzi, Wei Kang, Jean-Pierre Barbot,

Volume: 1, Page 1631 Paper number 1706

Abstract:

In this paper we deal with the problem of the analysis and the control of Hopf bifurcations. The methodology we adopt is based on the normal forms approach. We determine invariants which are numbers which does not change with coordinate change and feedback. The characterization of the Hopf bifurcation and the computation of the control law is based on these invariants.

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