a1 National Laboratory of Scientific Computation, LNCC/MCT, Rua Getulio Vargas 333, Quitandinha, Petrópolis, CEP 25651-070, Rio de Janeiro, RJ, Brazil (firstname.lastname@example.org) and Institute of Mathematics, Federal University of Rio de Janeiro, PO Box 68530, CEP 21945-970, Rio de Janeiro, RJ, Brazil
a2 Institute of Mathematics, Federal University of Rio de Janeiro, PO Box 68530, CEP 21945-970, Rio de Janeiro, RJ, Brazil (email@example.com)
The full nonlinear dynamic von Kárm´n system depending on a small parameter ε > 0 is considered. We study the asymptotic behaviour of the total energy associated with the model for large t and ε → 0. Introducing appropriate boundary feedback, we show that the total energy of a solution of the corresponding damped model decays exponentially as t → +∞, uniformly with respect to the parameter ε > 0. As ε → 0, we obtain a damped plate model for which the energy also tends to zero exponentially. The limit system can be viewed as new variant of the so-called Timoshenko model. It consists of a second-order hyperbolic equation for transversal vibrations of the plate coupled with a first-order ordinary differential equation whose solution appears as coefficient of the plate model and takes into account (when ε → 0) the contribution of the tangential components.
(Received November 28 2003)
(Accepted June 21 2005)