Elastic deformations of floaters for offshore wind turbines: Dynamic modelling and sectional load calculations

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedings – Annual report year: 2017Researchpeer-review


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To achieve economically and technically viable floating support structures for large 10MW+ wind turbines, structural flexibility may increase to the extent that becomes relevant to incorporate along with the corresponding physical effects within aero-hydro-servo-elastic simulation tools. Previous work described a method for the inclusion of substructural flexibility of large-volume substructures, including wave-structure interactions through linear radiation-diffraction theory. Through an implementation in the HAWC2 simulation tool, it was shown that one may incorporate the effects of additional modes on substructure and wind turbine response as well as predict the excitation of substructure flexible modes. This work goes one step further and describes a method to calculate internal substructural stresses that includes dynamic effects. In dynamic calculations, the substructure flexibility is considered through a reduced set of modes, selected based on their relevance to the external load frequency range, and represented with a superelement. The implementation of this method in aeroelastic simulation tool HAWC2 and wavestructure analysis programWAMIT is described, highlighting the practical challenges. A case study of the DTU 10MW Reference Wind Turbine installed on the Triple Spar concept is presented to illustrate the method. The results show that the substructure flexible modes, global platform motion and wind turbine loads can influence sectional loads within the substructure.
Original languageEnglish
Title of host publicationASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering
Number of pages10
PublisherAmerican Society of Mechanical Engineers
Publication date2017
Article numberOMAE2017-61446
ISBN (Electronic)978-0-7918-5778-6
Publication statusPublished - 2017
Event36th International Conference on Ocean, Offshore and Artic Engineering - Trondheim, Norway
Duration: 25 Jun 201730 Jun 2017
Conference number: 36


Conference36th International Conference on Ocean, Offshore and Artic Engineering
CitationsWeb of Science® Times Cited: No match on DOI

ID: 138866163