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Critical Velocity for Bending Vibration of a Cantilever Cruciform Cylinder

[+] Author Affiliations
Masanobu Watanabe, Tsuyoshi Hagiwara

Toshiba Corporation, Yokohama, Japan

Paper No. IMECE2002-32175, pp. 323-327; 5 pages
doi:10.1115/IMECE2002-32175
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • 5th International Symposium on Fluid Structure Interaction, Aeroelasticity, and Flow Induced Vibration and Noise
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Applied Mechanics Division
  • ISBN: 0-7918-3659-2 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

Tip amplitudes of an isolated cantilever cruciform cylinder were measured, varying flow velocity approaching the cylinder and flow angles with 0° and 45° to a water test channel in order to investigate the vibration behavior and critical velocity for bending vibration. Flow velocity varied from about 0.4 m/s to 3.3 m/s, which corresponds to from 0.4 to 3.0 in reduced form using wing length of cruciform cylinder and from 1.6×104 to 1.4×105 in Reynolds number. The amplitudes were measured using strain gauges installed at the cylinder. In the case of 45°, it was observed that the amplitudes increased drastically in two regions. One region was from 0.65 to 1.0 in reduced velocity and oscillating direction is drag direction; the other was from 1.0 to 1.6 and oscillating direction is lift direction. On the other hand, such large amplitude vibration was not observed in the case of 0°. According to previous study on Strouhal number of vortex shedding from a cruciform cylinder, Strouhal numbers are 0.2 and 0.9. Therefore, this large amplitude vibration is not thought to be due to the resonance with the vortex shedding.

Copyright © 2002 by ASME

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