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Meccanica
Erschienen in: Meccanica 3/2015

01.03.2015 | Advances in Dynamics, Stability and Control of Mechanical Systems

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

verfasst von: Claudio Mannini, Antonino M. Marra, Gianni Bartoli

Erschienen in: Meccanica | Ausgabe 3/2015

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Abstract

The interaction between galloping and vortex-induced vibration was experimentally investigated for an infinitely long rectangular cylinder with a side ratio of 3:2, free to vibrate in the transverse mode in smooth flow. This geometry showed strong proclivity to instability and large oscillations occurred also at high Scruton numbers, in a range of flow speeds where no excitation was expected according to the classical theory. A high value of the ratio of the quasi-steady galloping critical wind speed to Kármán-vortex resonance velocity is necessary to avoid such a combined instability. Measurements of transverse displacements, velocity fluctuations in the wake of the oscillating body and pressures on its surface highlighted nonlinear features of the fluid-structure coupled system, such as superharmonic resonances and hysteresis. In particular, for low values of the Scruton number, non-negligible excitation was observed at low reduced wind speed due to secondary resonance.
Vorheriger Artikel Linear stability of piezoelectric-controlled discrete mechanical systems under nonconservative positional forces
Nächster Artikel A new phenomenon of bi-stability: experimental and numerical evidence

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Metadaten
Titel
Experimental investigation on VIV-galloping interaction of a rectangular 3:2 cylinder
verfasst von
Claudio Mannini
Antonino M. Marra
Gianni Bartoli
Publikationsdatum
01.03.2015
Verlag
Springer Netherlands
Erschienen in
Meccanica / Ausgabe 3/2015
Print ISSN: 0025-6455
Elektronische ISSN: 1572-9648
DOI
https://doi.org/10.1007/s11012-014-0025-8

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