The effect of harmonic internal parametric damping (IPD) on the amplitude and the onset of the periodic galloping of a tower is investigated in the presence of steady and unsteady wind. The structure is modeled by a lumped single degree of freedom (sdof) equation and attention is focused on the cases where the unsteady (turbulent) wind activates the external excitation, the parametric one, or both. A perturbation analysis is performed to approximate periodic solutions and the effect of the IPD on the amplitude and the onset of periodic galloping is examined in different cases of loading. It is shown that the IPD substantially improves the reduction in the galloping amplitude for all cases of loading and it has no influence on the galloping onset.
Galloping of a Wind-Excited Tower Under Internal Parametric Damping
Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received August 14, 2013; final manuscript received January 6, 2014; published online February 5, 2014. Assoc. Editor: Mohammed Daqaq.
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Mokni, L., Kirrou, I., and Belhaq, M. (February 5, 2014). "Galloping of a Wind-Excited Tower Under Internal Parametric Damping." ASME. J. Vib. Acoust. April 2014; 136(2): 024503. https://doi.org/10.1115/1.4026505
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