A Method to Find Intervals With Probability of Harsh Ice Induced Vibrations

A method is proposed to estimate when harsh ice induced vibrations could be expected at an offshore site in an ice-infested region. The method aims to come up with specific estimates based on input parameters that are easily accessible. Therefore, the proposed method uses measured air temperatures, wind speeds, wind directions and ice concentrations, where some other relevant parameters such as ice thickness and ice drift speed could be calculated from these measured parameters. Test runs have been performed from a database with 60 years of environmental data. However, because global sea ice concentration climate data record was only available between the years of 1979 and 2015 in EUMETSAT OSI SAF, database of input parameters were adjusted covering this period. Further comparisons with historical observations as well as the full-scale data sets from the LOLEIF and STRICE projects have been utilized. The early results of this model show that including ice thickness, air temperature, ice drift speed, wind direction and ice concentration, time periods of the year with high probability of ice induced vibrations could be hindcasted. These findings have been proved against three seasons of registered vibration events at the Norströmsgrund lighthouse.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01745096
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 30 2020 12:30PM