# American Institute of Mathematical Sciences

March  2006, 5(1): 1-28. doi: 10.3934/cpaa.2006.5.1

## Lindstedt series for periodic solutions of beam equations with quadratic and velocity dependent nonlinearities

 1 Dipartimento di Matematica, Università di Roma "Tor Vergata", Roma, I-00133 2 Dipartimento di Matematica, Università di Roma Tre, Roma, I-00146, Italy

Received  April 2005 Revised  November 2005 Published  December 2005

We prove the existence of small amplitude periodic solutions, for a large Lebesgue measure set of frequencies, in the nonlinear beam equation with a weak quadratic and velocity dependent nonlinearity and with Dirichelet boundary conditions. Such nonlinear PDE can be regarded as a simple model describing oscillations of flexible structures like suspension bridges in presence of an uniform wind flow. The periodic solutions are explicitly constructed by a convergent perturbative expansion which can be considered the analogue of the Lindstedt series expansion for the invariant tori in classical mechanics. The periodic solutions are defined only in a Cantor set, and resummation techniques of divergent powers series are used in order to control the small divisors problem.
Citation: V. Mastropietro, Michela Procesi. Lindstedt series for periodic solutions of beam equations with quadratic and velocity dependent nonlinearities. Communications on Pure & Applied Analysis, 2006, 5 (1) : 1-28. doi: 10.3934/cpaa.2006.5.1
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