Volume 3, issue 2 | Copyright
Wind Energ. Sci., 3, 553-572, 2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research articles 23 Aug 2018

Research articles | 23 Aug 2018

A systematic approach to offshore wind turbine jacket predesign and optimization: geometry, cost, and surrogate structural code check models

Jan Häfele1, Rick R. Damiani2, Ryan N. King2, Cristian G. Gebhardt1, and Raimund Rolfes1 Jan Häfele et al.
  • 1Leibniz Universität Hannover, Institute of Structural Analysis, Appelstr. 9a, 30167 Hanover, Germany
  • 2National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA

Abstract. The main obstacles in preliminary design studies or optimization of jacket substructures for offshore wind turbines are high numerical expenses for structural code checks and simplistic cost assumptions. In order to create a basis for fast design evaluations, this work provides the following: first, a jacket model is proposed that covers topology and tube sizing with a limited set of design variables. Second, a cost model is proposed that goes beyond the simple and common mass-dependent approach. And third, the issue of numerical efficiency is addressed by surrogate models for both fatigue and ultimate limit state code checks. In addition, this work shows an example utilizing all models. The outcome can be utilized for preliminary design studies and jacket optimization schemes. It is suitable for scientific and industrial applications.

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Short summary
The present work provides a technical basis for the design of jacket structures used as substructures for offshore wind turbines. This involves models for the geometry, costs, and structural design code checks. An example application is shown in this paper, in which three different structural designs are compared. This work may lead to improved design approaches and finally to a cost reduction of offshore substructures.
The present work provides a technical basis for the design of jacket structures used as...