Options
The effect of variations in soil stiffness on the dynamic response of an offshore wind turbine
Date Issued
2013-11-21
Date Available
2015-12-08T15:44:06Z
Abstract
Offshore wind is a growing energy sector that has potential to provide vast quantities of the energy required to meet renewable energy targets. The recent growth in this sector has stimulated renewed interest in the behaviour of large diameter monopiles. Currently, over 75% of offshore wind turbine generators are founded on monopile foundations. The future predictions for offshore wind indicate th at these systems will be constructed in deeper waters further from the coast. This increase in water depth will lead to longer monopile free lengths, a factor that could negatively impact on their dynamic stability. This paper presents the results of a num erical investigation in which a range of monopile diameters in different water depths are analysed with respect to the overall wind turbine system natural frequency. Three different sand stiffness profiles are generated corresponding to loose, medium dense and dense sand using the industry standard American Petroleum Institute lateral loading design code. These sand profiles are indicative of offshore conditions found at many sites. Results indicate that significant care is required to ensure that the globa l stiffness response of the structure is such that the system natural frequency does not coincide with resonant excitation bands from the rotor’s motion. The stiffness of the soil governs the diameter of the monopile that can be used in different design water depths.
Sponsorship
Higher Education Authority
Other Sponsorship
European Regional Development Fund (ERDF)
Type of Material
Conference Publication
Publisher
European Wind Energy Association
Web versions
Language
English
Status of Item
Peer reviewed
Part of
Proceedings of the European Wind Energy Agency Offshore Conference
Conference Details
European Wind Energy Agency Offshore Conference, Messe Frankfurt, Germany, 19 - 21 November, 2013
This item is made available under a Creative Commons License
File(s)
Owning collection
Views
1478
Last Month
1
1
Acquisition Date
Mar 28, 2024
Mar 28, 2024
Downloads
141
Last Week
2
2
Last Month
6
6
Acquisition Date
Mar 28, 2024
Mar 28, 2024