Mitigation of ice loading on off-shore wind turbines

Feasibility study of a semi-active solution

Arkadiusz Mróz, Jan Holnicki-Szulc (Corresponding Author), Tuomo Kärnä

Research output: Contribution to journalArticleScientificpeer-review

28 Citations (Scopus)

Abstract

This paper focuses on mitigation of dynamic loading induced on off-shore towers by drifting ice. Conical structures attached to off-shore towers at water level are widely used to reduce static and dynamic ice actions. The level of remaining forces is enough to cause severe tower vibrations, therefore a need for an additional device to reduce the remaining actions is recognized. Present study introduces a new, compliant connection between the cone and the tower. Parameters of the connection are controlled semi-actively to optimize the effect. Numerical studies are made to roughly estimate the effectiveness of the new solution. First, contact problem of ice sheet and cone is simulated using simplified material model for ice. Then a numerical model of a wind turbine tower is constructed. Dynamic interaction between cone and tower is simulated and the new solution effectiveness is discussed.
Original languageEnglish
Pages (from-to)217 - 226
Number of pages10
JournalComputers and Structures
Volume86
Issue number3-5
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

Fingerprint

Offshore wind turbines
Wind Turbine
Ice
Towers
Cone
Cones
Contact Problem
Numerical Study
Vibration
Optimise
Water levels
Water
Wind turbines
Numerical models
Interaction
Estimate

Keywords

  • Impact load mitigation
  • Semi-active control
  • Conical structures
  • Ice loading
  • Off-shore wind turbine
  • Structural dynamics

Cite this

Mróz, Arkadiusz ; Holnicki-Szulc, Jan ; Kärnä, Tuomo. / Mitigation of ice loading on off-shore wind turbines : Feasibility study of a semi-active solution. In: Computers and Structures. 2008 ; Vol. 86, No. 3-5. pp. 217 - 226.
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Mitigation of ice loading on off-shore wind turbines : Feasibility study of a semi-active solution. / Mróz, Arkadiusz; Holnicki-Szulc, Jan (Corresponding Author); Kärnä, Tuomo.

In: Computers and Structures, Vol. 86, No. 3-5, 2008, p. 217 - 226.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Mitigation of ice loading on off-shore wind turbines

T2 - Feasibility study of a semi-active solution

AU - Mróz, Arkadiusz

AU - Holnicki-Szulc, Jan

AU - Kärnä, Tuomo

PY - 2008

Y1 - 2008

N2 - This paper focuses on mitigation of dynamic loading induced on off-shore towers by drifting ice. Conical structures attached to off-shore towers at water level are widely used to reduce static and dynamic ice actions. The level of remaining forces is enough to cause severe tower vibrations, therefore a need for an additional device to reduce the remaining actions is recognized. Present study introduces a new, compliant connection between the cone and the tower. Parameters of the connection are controlled semi-actively to optimize the effect. Numerical studies are made to roughly estimate the effectiveness of the new solution. First, contact problem of ice sheet and cone is simulated using simplified material model for ice. Then a numerical model of a wind turbine tower is constructed. Dynamic interaction between cone and tower is simulated and the new solution effectiveness is discussed.

AB - This paper focuses on mitigation of dynamic loading induced on off-shore towers by drifting ice. Conical structures attached to off-shore towers at water level are widely used to reduce static and dynamic ice actions. The level of remaining forces is enough to cause severe tower vibrations, therefore a need for an additional device to reduce the remaining actions is recognized. Present study introduces a new, compliant connection between the cone and the tower. Parameters of the connection are controlled semi-actively to optimize the effect. Numerical studies are made to roughly estimate the effectiveness of the new solution. First, contact problem of ice sheet and cone is simulated using simplified material model for ice. Then a numerical model of a wind turbine tower is constructed. Dynamic interaction between cone and tower is simulated and the new solution effectiveness is discussed.

KW - Impact load mitigation

KW - Semi-active control

KW - Conical structures

KW - Ice loading

KW - Off-shore wind turbine

KW - Structural dynamics

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JO - Computers and Structures

JF - Computers and Structures

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