Attractors for strongly damped wave equations with nonlinear hyperbolic dynamic boundary conditions

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We establish the well-posedness of a strongly damped semilinear wave equation equipped with nonlinear hyperbolic dynamic boundary conditions. Results are carried out with the presence of a parameter distinguishing whether the underlying operator is analytic, , or only of Gevrey class, . We establish the existence of a global attractor for each and we show that the family of global attractors is upper-semicontinuous as Furthermore, for each , we show the existence of a weak exponential attractor. A weak exponential attractor is a finite dimensional compact set in the weak topology of the phase space. This result ensures the corresponding global attractor also possesses finite fractal dimension in the weak topology; moreover, the dimension is independent of the perturbation parameter α. In both settings, attractors are found under minimal assumptions on the nonlinear terms.