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Estimates of the Number of Vibration Cycles From Frequency Locked-in Ice Loads

[+] Author Affiliations
Morten Bjerkås, Hagbart S. Alsos, Kasper Wåsjø

Reinertsen AS, Trondheim, Norway

Paper No. OMAE2014-23134, pp. V010T07A008; 7 pages
doi:10.1115/OMAE2014-23134
From:
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 10: Polar and Arctic Science and Technology
  • San Francisco, California, USA, June 8–13, 2014
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4556-1
  • Copyright © 2014 by ASME

abstract

A method is proposed to estimate the number of vibration cycles caused by frequency locked-in ice loads on a bottom fixed structure. Studies of the onset of frequency lock-in have been performed and based on that, different onset criteria are studied. It is shown in this work that most existing onset criteria significantly overestimate the vulnerability to frequency locked-in ice loads. The method described proposes a 90 % reduction in the number of vibration cycles in a winter season. The 2002–2003 winter at Norströmsgrund lighthouse is compared with the proposed method. The comparisons show that all available methods overestimate the number of vibration cycles significantly.

Copyright © 2014 by ASME

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