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.
Skip Nav Destination
The Twenty-third International Offshore and Polar Engineering Conference
June 30–July 5, 2013
Anchorage, Alaska
Resonance Forever in a Rotational System: The Infinite VIV Lock-In Regime for Pivoted Cylinders
Brad Stappenbelt;
Brad Stappenbelt
University of Wollongong
Search for other works by this author on:
Andrew Johnstone
Andrew Johnstone
University of Wollongong
Search for other works by this author on:
Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, Anchorage, Alaska, June 2013.
Paper Number:
ISOPE-I-13-387
Published:
June 30 2013
Citation
Stappenbelt, Brad, and Andrew Johnstone. "Resonance Forever in a Rotational System: The Infinite VIV Lock-In Regime for Pivoted Cylinders." Paper presented at the The Twenty-third International Offshore and Polar Engineering Conference, Anchorage, Alaska, June 2013.
Download citation file:
Sign in
Don't already have an account? Register
Personal Account
You could not be signed in. Please check your username and password and try again.
Could not validate captcha. Please try again.
Pay-Per-View Access
$20.00
Advertisement
5
Views
Advertisement
Suggested Reading
Advertisement