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ESTIMATION OF NATURAL FREQUENCY OF OFFSHORE MONOPILE WIND TURBINES CONSIDERING FOUNDATION FLEXIBILITY AND TOWER MASS

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Year: 2016
COI code: ICOPMAS12_068
Paper Language: English

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Authors ESTIMATION OF NATURAL FREQUENCY OF OFFSHORE MONOPILE WIND TURBINES CONSIDERING FOUNDATION FLEXIBILITY AND TOWER MASS

  Saeed Darvishi Alamouti1 - School of Civ. Eng., Faculty of Engineering, University of Tehran, Tehran, Iran
  Mohammad Reza Bahaari - School of Civ. Eng., Faculty of Engineering, University of Tehran, Tehran, Iran
  Majid Moradi - School of Civ. Eng., Faculty of Engineering, University of Tehran, Tehran, Iran

Abstract:

With world effort focused on the reducing impact of greenhouse gases, wind (offshore or onshore) has been a serious contender for large-scale, cost-effective and cleansource of energy. In offshore wind energy technology, monopiles are the most frequently used substructures to resist lateral cyclic loads produced by wind and waves [1].Monopiles are the most common sub structure design, especially where turbines of rated capacity less than 5 MW are used in water depths of less than 30m [2]. In offshorewind turbines, support structures are highly sensitive to dynamic loading [3]. Thus, estimation of the structure natural frequency is an important design stage [4]. Inoffshore wind turbines, dynamic properties of the structural system are strongly influenced by the foundation stiffness, especially in monopile support structures [5]. Theaim of this work is to provide an analytical estimation for the natural frequency of monopile supported offshore wind turbines using Rayleigh method. Foundation stiffnesseffect is simply considered as a rotational spring. Simple equations relating natural frequency to the structural parameters including mass and foundation stiffness arepresented which are beneficial in the preliminary stages of the design.

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COI code: ICOPMAS12_068

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Darvishi Alamouti1, Saeed; Mohammad Reza Bahaari & Majid Moradi, 2016, ESTIMATION OF NATURAL FREQUENCY OF OFFSHORE MONOPILE WIND TURBINES CONSIDERING FOUNDATION FLEXIBILITY AND TOWER MASS, 12th International Conference on Coasts, Ports and Marine Structures, تهران, سازمان بنادر و دريانوردي, https://www.civilica.com/Paper-ICOPMAS12-ICOPMAS12_068.htmlInside the text, wherever referred to or an achievement of this article is mentioned, after mentioning the article, inside the parental, the following specifications are written.
First Time: (Darvishi Alamouti1, Saeed; Mohammad Reza Bahaari & Majid Moradi, 2016)
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Type: state university
Paper No.: 55061
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