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Stabilization of the damped wave equation with Cauchy–Ventcel boundary conditions

Stabilization of the damped wave equation with Cauchy–Ventcel boundary conditions This paper is devoted to the study of uniform energy decay rates of solutions to the wave equation with Cauchy–Ventcel boundary conditions: $$\left\{\begin{array}{l@{\qquad}l@{\quad}l} u_{tt}- \Delta u +a(x)g(u_t)=0 \quad {\rm in}\quad \Omega\;\times ) 0,\infty(\\ \partial_{\nu} u - \Delta_{\Gamma_1}u=0 \qquad \qquad \quad {\rm on}\quad \Gamma_{1}\times ) 0,\infty(\\ u=0\qquad \qquad \qquad \quad \qquad {\rm on} \quad\Gamma_{0}\times ) 0,\infty (\end{array}\right.$$ where Ω is a bounded domain of $${\mathbb{R}^{n}}$$ ( n ≥ 2) having a smooth boundary $${\Gamma :=\partial \Omega}$$ , such that $${ \Gamma =\Gamma _{0} \cup \Gamma_{1}}$$ with $${\Gamma_0}$$ , $${\Gamma_1}$$ being closed and disjoint. It is known that if a ( x ) = 0 then the uniform exponential stability never holds even if a linear frictional feedback is applied to the entire boundary of the domain (see, for instance, Hemmina (ESAIM, Control Optim Calc Var 5:591–622, 2000, Thm. 3.1)). Let $${f:\overline{\Omega} \rightarrow \mathbb R}$$ be a smooth function; define ω 1 to be a neighbourhood of $${\Gamma_1}$$ , and subdivide the boundary $${\Gamma_0}$$ into two parts: $${\Gamma_0^{\ast}=\{x\in \Gamma_0;\partial_{\nu}f > 0\}}$$ and $${\Gamma_0 \backslash \Gamma_0^{\ast}}$$ . Now, let ω 0 be a neighbourhood of $${\overline{\Gamma_0^{\ast}}}$$ . We prove that if a ( x ) ≥ a 0 > 0 on the open subset $${\omega =\omega_0 \cup \omega_1}$$ and if g is a monotone increasing function satisfying k | s | ≤ | g ( s )| ≤ K | s | for all | s | ≥ 1, then the energy of the system decays uniformly at the rate quantified by the solution to a certain nonlinear ODE dependent on the damping (as in Lasiecka and Tataru (Differ Integral Equ 6:507–533, 1993)). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Evolution Equations Springer Journals

Stabilization of the damped wave equation with Cauchy–Ventcel boundary conditions

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References (39)

Publisher
Springer Journals
Copyright
Copyright © 2009 by Birkhäuser Verlag Basel/Switzerland
Subject
Mathematics; Analysis
ISSN
1424-3199
eISSN
1424-3202
DOI
10.1007/s00028-009-0002-1
Publisher site
See Article on Publisher Site

Abstract

This paper is devoted to the study of uniform energy decay rates of solutions to the wave equation with Cauchy–Ventcel boundary conditions: $$\left\{\begin{array}{l@{\qquad}l@{\quad}l} u_{tt}- \Delta u +a(x)g(u_t)=0 \quad {\rm in}\quad \Omega\;\times ) 0,\infty(\\ \partial_{\nu} u - \Delta_{\Gamma_1}u=0 \qquad \qquad \quad {\rm on}\quad \Gamma_{1}\times ) 0,\infty(\\ u=0\qquad \qquad \qquad \quad \qquad {\rm on} \quad\Gamma_{0}\times ) 0,\infty (\end{array}\right.$$ where Ω is a bounded domain of $${\mathbb{R}^{n}}$$ ( n ≥ 2) having a smooth boundary $${\Gamma :=\partial \Omega}$$ , such that $${ \Gamma =\Gamma _{0} \cup \Gamma_{1}}$$ with $${\Gamma_0}$$ , $${\Gamma_1}$$ being closed and disjoint. It is known that if a ( x ) = 0 then the uniform exponential stability never holds even if a linear frictional feedback is applied to the entire boundary of the domain (see, for instance, Hemmina (ESAIM, Control Optim Calc Var 5:591–622, 2000, Thm. 3.1)). Let $${f:\overline{\Omega} \rightarrow \mathbb R}$$ be a smooth function; define ω 1 to be a neighbourhood of $${\Gamma_1}$$ , and subdivide the boundary $${\Gamma_0}$$ into two parts: $${\Gamma_0^{\ast}=\{x\in \Gamma_0;\partial_{\nu}f > 0\}}$$ and $${\Gamma_0 \backslash \Gamma_0^{\ast}}$$ . Now, let ω 0 be a neighbourhood of $${\overline{\Gamma_0^{\ast}}}$$ . We prove that if a ( x ) ≥ a 0 > 0 on the open subset $${\omega =\omega_0 \cup \omega_1}$$ and if g is a monotone increasing function satisfying k | s | ≤ | g ( s )| ≤ K | s | for all | s | ≥ 1, then the energy of the system decays uniformly at the rate quantified by the solution to a certain nonlinear ODE dependent on the damping (as in Lasiecka and Tataru (Differ Integral Equ 6:507–533, 1993)).

Journal

Journal of Evolution EquationsSpringer Journals

Published: May 1, 2009

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