Jacket Substructure Fatigue Mitigation through Active Control

Tomas Hanis, Anand Natarajan

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Abstract

As offshore wind farms are being installed farther and in deeper waters offshore, new, and more sophisticated marine substructures such as jackets need to be used. Herein, a 10MW wind turbine mounted on a jacket sub structure at a mean water depth of 50 meters is investigated with regards to the fatigue design loads on the braces of the jacket. Since large wind turbines of 10MW rating have low rotor speeds (p), the modal frequencies of the sub structures approach 3p at low wind speeds, which leads to a modal coupling and resonance. Therefore an active control system is developed which provides sufficient structural damping and consequently a fatigue reduction at the substructure. The resulting reduction in fatigue design loads on the jacket structure based on the active control system is presented.
Original languageEnglish
Title of host publication Proceedings of the 11th World Congress on Computational Mechanics (WCCM XI)
EditorsEugenio Onate, Xavier Oliver, Antonio Huerta
Number of pages9
Volume4
PublisherInternational Center for Numerical Methods in Engineering
Publication date2014
Pages3767-3775
ISBN (Print)978-84-942844-7-2
Publication statusPublished - 2014
Event11th World Congress on Computational Mechanics, 5th European Conference on Computational Mechanics, 6th European Conference on Computational Fluid Dynamics - Barcelona, Spain
Duration: 20 Jul 201425 Jul 2014

Conference

Conference11th World Congress on Computational Mechanics, 5th European Conference on Computational Mechanics, 6th European Conference on Computational Fluid Dynamics
Country/TerritorySpain
CityBarcelona
Period20/07/201425/07/2014

Keywords

  • MATHEMATICS,
  • MECHANICS
  • Fatigue load
  • extreme load
  • active control
  • foundation structure

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