Quasi-Periodic Galloping of a Wind-Excited Tower Under External Forcing and Parametric Damping

Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 168)

Abstract

This paper investigates the influence of combined fast external excitation and internal parametric damping on the amplitude and the onset of the quasi-periodic galloping of a tower submitted to steady and unsteady wind flow. The study is carried out considering a lumped single degree of freedom model and the cases where the turbulent wind activates different excitations are explored. The method of direct partition of motion followed by the multiple scales technique are applied to derive the slow flow dynamic near the primary resonance. The influence of the combined loading consisting in external excitation and parametric damping on the quasi-periodic galloping onset is explored. The performance of the combined loading is compared with the cases where the external excitation and the parametric damping are introduced separately. The results show that the performance of the combined loading on retarding the quasi-periodic galloping onset and quenching the corresponding amplitude is better in all cases of the turbulent wind excitations.

Keywords

Galloping phenomena Parametric internal damping Quasi-periodic galloping Wind excited tower 

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.University Hassan II-CasablancaCasablancaMorocco

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