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Time-frequency analysis of acceleration data from ship-ice interaction events
Number of Authors: 2
Responsible organisation
2018 (English)In: Cold Regions Science and Technology, ISSN 0165-232X, E-ISSN 1872-7441, Vol. 156, p. 61-74Article in journal (Refereed) Published
Abstract [en]

During operations with ships in ice-infested waters, vibrations of the hull occur due to ship-ice interaction. The acting ice load and the induced vibrations depend on the ice regime and ice breaking mechanism. Especially crushing of ice against the hull causes high loads against the vessel. The objective of this study is to analyse the frequency components of ice-induced vibrations, measured with accelerometers placed in the bow section of the ship’s hull. The Wigner-Ville distribution, which provides a time-frequency representation, is applied on acceleration data collected on the icebreaker Frej during transit in ice-infested Arctic waters. The resulting time-frequency representations show that the excited frequencies depend on the dominant ice breaking mechanism, on the encounter velocity, and on the position of where the ice interaction against the hull occurs. Furthermore, the natural frequencies of the ship’s hull change slightly, depending on the conditions on the sea-ice around the vessel. It is concluded that a system of distributed accelerometers on a ship can provide information about the acting ice breaking mechanism, the ice conditions around the vessel, and about the location along the hull, where the ship-ice interaction occurs. This can be used as an additional tool in monitoring systems during operations in ice-infested waters.

Place, publisher, year, edition, pages
2018. Vol. 156, p. 61-74
Keywords [en]
Arctic, Ship-ice interaction, Acceleration, Wigner-Ville distribution, Time-frequency analysis, Vibrations, Ice load, Marine technology, Ocean engineering, Icebreaker Oden
National Category
Engineering and Technology
Research subject
SWEDARCTIC 2015, OATRC 2015
Identifiers
URN: urn:nbn:se:polar:diva-8413DOI: 10.1016/j.coldregions.2018.01.019OAI: oai:DiVA.org:polar-8413DiVA, id: diva2:1417155
Note

OATRC2015

Available from: 2020-03-26 Created: 2020-03-26 Last updated: 2020-03-26

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Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S0165232X17300368
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CiteExportLink to record
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Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf