The interaction between vortex-induced vibration and galloping for an infinitely long 3:2 rectangular cylinder was investigated through wind tunnel tests. This section was found to be very unstable and large vibration amplitudes were observed also at high Scruton number due to this interference effect. In order such a phenomenon not to occur it was necessary to increase significantly the mass-damping parameter. In particular, no interaction was observed for a ratio of the quasi-steady galloping to vortex-induced vibration critical wind speeds as high as 7.5, while it was still present for a ratio of 5.3. The practical consequence of that seems to be the necessity to install dampers in several prismatic slender structures with a rectangular cross section similar to the one considered herein.

Experimental investigation on the VIV-galloping instability of a 3:2 rectangular cylinder / Claudio Mannini; Antonino Maria Marra; Gianni Bartoli. - (2013), pp. 1-10. (Intervento presentato al convegno XXI Congresso dell'Associazione Italiana di Meccanica Teorica e Applicata (AIMETA) tenutosi a Torino nel 17-20 Settembre 2013).

Experimental investigation on the VIV-galloping instability of a 3:2 rectangular cylinder

MANNINI, CLAUDIO;MARRA, ANTONINO MARIA;BARTOLI, GIANNI
2013

Abstract

The interaction between vortex-induced vibration and galloping for an infinitely long 3:2 rectangular cylinder was investigated through wind tunnel tests. This section was found to be very unstable and large vibration amplitudes were observed also at high Scruton number due to this interference effect. In order such a phenomenon not to occur it was necessary to increase significantly the mass-damping parameter. In particular, no interaction was observed for a ratio of the quasi-steady galloping to vortex-induced vibration critical wind speeds as high as 7.5, while it was still present for a ratio of 5.3. The practical consequence of that seems to be the necessity to install dampers in several prismatic slender structures with a rectangular cross section similar to the one considered herein.
2013
Atti del XXI Congresso dell'Associazione Italiana di Meccanica Teorica e Applicata (AIMETA)
XXI Congresso dell'Associazione Italiana di Meccanica Teorica e Applicata (AIMETA)
Torino
17-20 Settembre 2013
Claudio Mannini; Antonino Maria Marra; Gianni Bartoli
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/819531
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