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Controllability and Stabilization of Parabolic Equations

  • 2018
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About this book

This monograph presents controllability and stabilization methods in control theory that solve parabolic boundary value problems. Starting from foundational questions on Carleman inequalities for linear parabolic equations, the author addresses the controllability of parabolic equations on a variety of domains and the spectral decomposition technique for representing them. This method is, in fact, designed for use in a wider class of parabolic systems that include the heat and diffusion equations. Later chapters develop another process that employs stabilizing feedback controllers with a finite number of unstable modes, with special attention given to its use in the boundary stabilization of Navier–Stokes equations for the motion of viscous fluid. In turn, these applied methods are used to explore related topics like the exact controllability of stochastic parabolic equations with linear multiplicative noise.
Intended for graduate students and researchers working on control problems involving nonlinear differential equations, Controllability and Stabilization of Parabolic Equations is the distillation of years of lectures and research. With a minimum of preliminaries, the book leaps into its applications for control theory with both concrete examples and accessible solutions to problems in stabilization and controllability that are still areas of current research.

Table of Contents

Frontmatter
Chapter 1. Preliminaries
Abstract
Here we survey for later use some basic existence results for the infinite dimensional Cauchy problem, semilinear parabolic-like boundary value problems, and infinite dimensional control systems.
Viorel Barbu
Chapter 2. The Carleman Inequality for Linear Parabolic Equations
Abstract
This chapter is concerned with the Carleman estimates for the backward linear parabolic equations on smooth and bounded domains of \({\mathbb {R}}^d\) which implies observability that, as seen earlier, is the main tool to investigate the exact controllability of the forward parabolic controlled system.
Viorel Barbu
Chapter 3. Exact Controllability of Parabolic Equations
Abstract
This chapter is concerned with the presentation of some basic results on the exact internal and boundary controllability of linear and semilinear parabolic equations on smooth domains of \({\mathbb {R}}^d.\) The exact controllability of linear stochastic parabolic equations with linear multiplicative Gaussian noise is also briefly studied. The main ingredient to exact controllability is the observability inequality for the dual parabolic equations established in Chapter 2.
Viorel Barbu
Chapter 4. Internal Controllability of Parabolic Equations with Inputs in Coefficients
Abstract
Very often, the input control arises in the coefficients of a parabolic equation and the exact controllability of initial data to origin or to a given stationary state is a delicate problem which cannot be treated by the linearization method developed in the previous chapter. However, in some situations, one can construct explicit feedback controllers which steer initial data to a given stationary state. In general, such a controller is nonlinear, eventually multivalued mapping, and its controllability effect is based on the property of solutions to certain nonlinear partial differential equations to have extinction in finite time. Here we shall study a few examples of this type.
Viorel Barbu
Chapter 5. Feedback Stabilization of Semilinear Parabolic Equations
Abstract
We shall discuss here the internal and boundary feedback stabilization of equilibrium solutions to semilinear parabolic equations. The main conclusion is that such an equation is stabilizable by a feedback controller with finite dimensional structure dependent of the unstable spectrum of the corresponding linearized system around the equilibrium solution.
Viorel Barbu
Chapter 6. Boundary Stabilization of Navier–Stokes Equations
Abstract
The stabilization of fluid flows and, in particular, of Navier–Stokes equations was extensively studied via the Riccati-based approach in the last decade and the main references are the works.
Viorel Barbu
Backmatter
Title
Controllability and Stabilization of Parabolic Equations
Author
Viorel Barbu
Copyright Year
2018
Electronic ISBN
978-3-319-76666-9
Print ISBN
978-3-319-76665-2
DOI
https://doi.org/10.1007/978-3-319-76666-9

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