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In this paper, we consider a one-dimensional finite-memory Bresse system with homogeneous Dirichlet-Neumann-Neumann boundary conditions. We prove some general decay results for the energy associated with the system in the case of equal and non-equal speeds of wave propagation under appropriate conditions on the relaxation function. In addition, we show by giving an example that in the case of equal speeds of wave propagation and for certain polynomially decaying relaxation functions, our result gives an optimal decay rate in the sense that the decay rate of the system is exactly the same as that of the relaxation function considered. We also include some numerical illustrations in order to validate our theoretical findings. [ABSTRACT FROM AUTHOR]

In this paper, we are concerned with a porous thermoelastic system with thermal dissipation and delay term. We prove a well posedness result by the use of the Hille-Yosida theorem. In addition, we use the multiplier method to establish an exponential stability result in the case of equal-wave speeds and a lack of the exponential stability in the opposite case. Our results improve and extend many previous results. [ABSTRACT FROM AUTHOR]

In this paper, we study a fourth-order plate problem as a model for a suspension bridge in the presence of a nonlinear frictional damping and a hanger restoring force. We establish the existence of a global weak solution and prove a stability result.

In this paper, we consider a piezoelectric beam model with nonlinear source terms and investigate the interaction between a viscoelastic damping and a nonlinear frictional damping. Under general assumptions on the relaxation function and the nonlinear feedback, we establish explicit formulae for the energy decay rates of this system and prove that the energy decays at a rate dictated by the weaker damping. Our results substantially improve some earlier related results in the literature. [ABSTRACT FROM AUTHOR]