Finite amplitude underwater flexural vibrations of cantilevers

Matteo Aureli, Maurizio Porfiri

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We study flexural vibrations of a thin rectangular cross section cantilever beam submerged in a quiescent viscous fluid. The cantilever is subject to base excitation and undergoes oscillations whose amplitude is comparable with its width. The structure is modeled as an Euler-Bernoulli beam and the fluid-structure interaction is captured through a nonlinear complex-valued hydrodynamic function which accounts for added mass and fluid damping. Results from a parametric 2D computational fluid dynamics analysis of an oscillating rigid lamina, representative of a generic beam cross section, are used to establish the dependence of the hydrodynamic function on the governing flow parameters. It is found that, as the frequency and amplitude of the vibration increase, vortex shedding and convection phenomena are enhanced, thus promoting nonlinear hydrody-namic damping. We derive a computationally efficient reduced order modal model for beam oscillations incorporating the nonlinear hydrodynamic function and we validate theoretical results against experiments on underwater vibrations flexible beams.

Original languageEnglish (US)
Title of host publicationASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2012
Pages373-381
Number of pages9
DOIs
StatePublished - 2012
EventASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2012 - Stone Mountain, GA, United States
Duration: Sep 19 2012Sep 21 2012

Publication series

NameASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2012
Volume1

Other

OtherASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2012
CountryUnited States
CityStone Mountain, GA
Period9/19/129/21/12

ASJC Scopus subject areas

  • Artificial Intelligence
  • Civil and Structural Engineering
  • Mechanics of Materials

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  • Cite this

    Aureli, M., & Porfiri, M. (2012). Finite amplitude underwater flexural vibrations of cantilevers. In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2012 (pp. 373-381). (ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, SMASIS 2012; Vol. 1). https://doi.org/10.1115/SMASIS2012-7985