CONTROL AND STABILIZATION OF DEGENERATE WAVE EQUATIONS

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Leugering G, Cannarsa P, Alabau-Boussouira F
Zeitschrift: SIAM Journal on Control and Optimization
Verlag: SIAM PUBLICATIONS
Jahr der Veröffentlichung: 2017
Band: 55
Heftnummer: 3
Seitenbereich: 2052-2087
ISSN: 0363-0129


Abstract


We study a wave equation in one space dimension with a general diffusion coefficient which degenerates on part of the boundary. Degeneracy is measured by a real parameter mu(a) > 0. We establish observability inequalities for weakly (when mu(a) is an element of [0, 1[) as well as strongly (when mu(a) is an element of [1, 2[) degenerate equations. We also prove a negative result when the diffusion coefficient degenerates too violently (i.e., when mu(a) > 2) and prove the blowup of the observability time when mu(a) converges to 2 from below. Thus, using the Hilbert uniqueness method we deduce the exact controllability of the corresponding degenerate control problem when mu(a) is an element of [0, 2[. We conclude the paper by studying the boundary stabilization of the degenerate linearly damped wave equation and show that a suitable boundary feedback stabilizes the system exponentially. We extend this stability analysis to the degenerate nonlinearly boundary-damped wave equation for an arbitrarily growing nonlinear feedback close to the origin. This analysis proves that the degeneracy does not affect the optimal energy decay rates at large time. We apply the optimal-weight convexity method of [F. Alabau-Boussouira, Appl. Math. Optim., 51 (2005), pp. 61-105], [F. Alabau-Boussouira, J. Differential Equations, 249 (2010), pp. 1473-1517], together with our results for linear damping, to perform this stability analysis.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Leugering, Günter Prof. Dr.
Lehrstuhl für Angewandte Mathematik


Einrichtungen weiterer Autorinnen und Autoren

Università degli Studi di Roma 'Tor Vergata'


Zitierweisen

APA:
Leugering, G., Cannarsa, P., & Alabau-Boussouira, F. (2017). CONTROL AND STABILIZATION OF DEGENERATE WAVE EQUATIONS. SIAM Journal on Control and Optimization, 55(3), 2052-2087. https://dx.doi.org/10.1137/15M1020538

MLA:
Leugering, Günter, Piermarco Cannarsa, and Fatiha Alabau-Boussouira. "CONTROL AND STABILIZATION OF DEGENERATE WAVE EQUATIONS." SIAM Journal on Control and Optimization 55.3 (2017): 2052-2087.

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