On the stability of Timoshenko-type systems with internal frictional dampings and discrete time delays

Abstract

In this paper, we consider a vibrating system of Timoshenko-type in a bounded one-dimensional domain under Dirichlet–Dirichlet or Dirichlet–Neumann boundary conditions with one or two discrete time delays and one or two internal frictional dampings. First, we show that the system is well posed in the sens of semigroup theory. Second, we prove the exponential stability regardless to the speeds of wave propagation of the system if the weights of the time delays are smaller than the ones of the corresponding dampings, respectively. However, when the weight of one time delay is not smaller than the one of the corresponding damping, we prove the exponential stability in case of equal-speed wave propagation, and the polynomial stability in the opposite case.

Keywords:

• Well posedness
• stability
• time delay
• frictional damping
• Timoshenko-type
• semigroup theory
• Lyapunov functional

AMS Subject Classifications:

• 35L05
• 35L15
• 35L70
• 93D15

Acknowledgements

This work was initiated during the visit of the first author to the University of Sharjah, UAE, in April 2014. The first author wishes to thank this university for its kind hospitality.

Notes

No potential conflict of interest was reported by the authors.