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The dynamics of a rising pivoted cylinder

Conference Paper


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Abstract


  • The existence of a critical mass ratio for cylinders undergoing

    vortex-induced vibration (VIV) in a translational system has been

    well established. Below this critical point, the reduced velocity at

    VIV lock-out tends to infinity. It has been surmised that a

    corresponding mass moment of inertia ratio must exist for a

    pivoted cylinder arrangement. To the authors’ knowledge there

    has been no investigation published substantiating this premise.

    The aim of the present investigation then was to examine the

    critical point for cylinders in a rotational system. The approach

    adopted involved measuring the VIV amplitude response of a

    positively buoyant, and hence rising, pivoted cylinder at very

    high reduced velocity. High reduced velocity was attained by

    establishing a very low system natural frequency through the

    omission of external restoring forces. 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 does not however appear to be governed by the mass

    moment of inertia ratio but rather by the force moment ratio.

Publication Date


  • 2012

Citation


  • Stappenbelt, B., Neville, J., Murdoch, B. & Johnstone, A. (2012). The dynamics of a rising pivoted cylinder. 18th Australasian Fluid Mechanics Conference (pp. 31-34). Australia: Australian Fluid Mechanics Society.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1485&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/480

Start Page


  • 31

End Page


  • 34

Abstract


  • The existence of a critical mass ratio for cylinders undergoing

    vortex-induced vibration (VIV) in a translational system has been

    well established. Below this critical point, the reduced velocity at

    VIV lock-out tends to infinity. It has been surmised that a

    corresponding mass moment of inertia ratio must exist for a

    pivoted cylinder arrangement. To the authors’ knowledge there

    has been no investigation published substantiating this premise.

    The aim of the present investigation then was to examine the

    critical point for cylinders in a rotational system. The approach

    adopted involved measuring the VIV amplitude response of a

    positively buoyant, and hence rising, pivoted cylinder at very

    high reduced velocity. High reduced velocity was attained by

    establishing a very low system natural frequency through the

    omission of external restoring forces. 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 does not however appear to be governed by the mass

    moment of inertia ratio but rather by the force moment ratio.

Publication Date


  • 2012

Citation


  • Stappenbelt, B., Neville, J., Murdoch, B. & Johnstone, A. (2012). The dynamics of a rising pivoted cylinder. 18th Australasian Fluid Mechanics Conference (pp. 31-34). Australia: Australian Fluid Mechanics Society.

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1485&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/480

Start Page


  • 31

End Page


  • 34