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Doctoral Thesis
DOI
https://doi.org/10.11606/T.55.2016.tde-30092016-144225
Document
Author
Full name
Rodrigo Nunes Monteiro
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2016
Supervisor
Committee
Fu, Ma To (President)
Cavalcanti, Marcelo Moreira
Cruz, German Jesus Lozada
Lasiecka, Irena
Santos, Ederson Moreira dos
Title in English
Long-time dynamics of two classes of beam and plate equations
Keywords in English
Exponential attractors
Global attractor
Partial differential equations
Thermoelasticity
Upper-semicontinuity
Abstract in English
In this thesis we will discuss the well-posedness and long-time dynamics of curved beam and thermoelastic plates. First, we considered the Bresse system with nonlinear damping and forcing terms. For this model we show the Timoshenko system as a singular limit of the Bresse system as the arch curvature l goes to 0 and under suitable assumptions on the nonlinearity we prove the existence of a smooth global attractor with finite fractal dimension and exponential attractors as well. We also compare the Bresse system with the Timoshenko system, in the sense of upper-semicontinuity of their attractors as l → 0. Second, we study a full von Karman system, this model accounts for vertical and in plane displacements. For this system we add a nonlinear thermal coupling and free boundary conditions. It is shown that the system, without any mechanical dissipation imposed on vertical displacements, admits a global attractor which is also smooth and of finite fractal dimension.
Title in Portuguese
Dinâmica a longo prazo de duas classes de equações de viga e placa
Keywords in Portuguese
Atrator exponencial
Atrator global
Equações diferenciais parciais
Semicontinuidade
Termoelásticidade.
Abstract in Portuguese
Neste trabalho iremos discutir a existência, unicidade, dependência contínua e a dinâmica a longo prazo das soluções de um sistema de equações que modela a vibração de vigas curvas e um modelo de placas termoelásticas. Primeiro consideramos o modelo de Bresse com dissipação não linear e forças externas. Provamos que o sistema de Timoshenko pode ser obtido como limite do sistema de Bresse quando o arco de curvatura l tende para zero e sob algumas hipóteses, mostramos a existência de um atrator global com dimensão fractal finita. Também comparamos o sistema de Bresse com o sistema de Timoshenko no sentido da semicontinuidade de seus atratores quando o parâmetro l → 0. Na segunda parte estudamos o sistema de full Von Karmam. Neste modelo adicionamos efeitos térmicos e condições de fronteira do tipo livre. Mostramos que esse problema, sem dissipação mecânica no deslocamento vertical, também possui um atrator global regular com dimensão infinita.
 
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Publishing Date
2016-09-30
 
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