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Resonance forever in a rotational system: the infinite VIV lock-in regime for pivoted cylinders

Conference Paper


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Abstract


  • The aim of the present investigation was to examine the critical

    vortex-induced vibration (VIV) point for cylinders in a rotational

    system. For translational systems, the existence of a critical mass ratio

    for cylinders undergoing vortex-induced vibration has been well

    established. At mass ratios below this critical point, the reduced

    velocity at VIV lock-out tends to infinity, resulting in the resonance

    forever condition as described by the authors first reporting this

    phenomenon. The approach adopted in the present investigation

    involved measuring the VIV response of a positively buoyant pivoted

    cylinder being towed at very high reduced velocity. High reduced

    velocity was attained by establishing a very low system natural

    frequency. The key finding of this study is the presence of a critical

    point with a value similar to that of the critical mass ratio in

    translational systems. This critical point appears to be governed by the

    force moment ratio rather than the mass moment of inertia ratio. In the

    present study, a critical force moment ratio of 0.512 ± 0.002 was

    determined as the onset point for the infinite VIV lock-in regime.

Publication Date


  • 2013

Citation


  • Stappenbelt, B. & Johnstone, A. (2013). Resonance forever in a rotational system: the infinite VIV lock-in regime for pivoted cylinders. Proceedings of the Twenty-third (2013) International Offshore and Polar Engineering (pp. 420-425). Cupertino, United States: International Society of Offshore and Polar Engineers.

Scopus Eid


  • 2-s2.0-84883694396

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2200&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1191

Start Page


  • 420

End Page


  • 425

Abstract


  • The aim of the present investigation was to examine the critical

    vortex-induced vibration (VIV) point for cylinders in a rotational

    system. For translational systems, the existence of a critical mass ratio

    for cylinders undergoing vortex-induced vibration has been well

    established. At mass ratios below this critical point, the reduced

    velocity at VIV lock-out tends to infinity, resulting in the resonance

    forever condition as described by the authors first reporting this

    phenomenon. The approach adopted in the present investigation

    involved measuring the VIV response of a positively buoyant pivoted

    cylinder being towed at very high reduced velocity. High reduced

    velocity was attained by establishing a very low system natural

    frequency. The key finding of this study is the presence of a critical

    point with a value similar to that of the critical mass ratio in

    translational systems. This critical point appears to be governed by the

    force moment ratio rather than the mass moment of inertia ratio. In the

    present study, a critical force moment ratio of 0.512 ± 0.002 was

    determined as the onset point for the infinite VIV lock-in regime.

Publication Date


  • 2013

Citation


  • Stappenbelt, B. & Johnstone, A. (2013). Resonance forever in a rotational system: the infinite VIV lock-in regime for pivoted cylinders. Proceedings of the Twenty-third (2013) International Offshore and Polar Engineering (pp. 420-425). Cupertino, United States: International Society of Offshore and Polar Engineers.

Scopus Eid


  • 2-s2.0-84883694396

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2200&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1191

Start Page


  • 420

End Page


  • 425