Wind turbine structural model using non-linear modal formulations

Lars O. Bernhammer, Roeland De Breuker, Moti Karpel

Research output: Contribution to conferenceAbstractScientific

3 Citations (Scopus)


In this paper a new method to obtain a geometrically non-linear wind turbine structural model based on the full linear finite element model is presented. For this purpose, the wind turbine model is divided into multiple segments, i.e. tower, drive train and blades. For each segment a modal analysis is carried out. Boundary grid points are defined on each segment and loaded by ficticious masses. The modal analysis produces a set of 6 rigid-body modes and elastic modes close to fixed-fixed analysis. For the aeroelastic turbine simulation, the ficticious masses are removed. The elastic modes are used as master modes that describe the deformation, while the rigid-body modes are used as slaves to establish compatibility between the segments. A modal analysis is carried out in the local segment attached reference frame, yielding a local linear solution that is part of a global non-linear analysis. Large rotations and displacements are provided by rigid-body modes in a co-rotational framework.

Original languageEnglish
Number of pages1
Publication statusPublished - 28 Feb 2014
Event32nd ASME Wind Energy Symposium - SciTech Forum and Exposition 2014 - National Harbor, MD, United States
Duration: 13 Jan 201417 Jan 2014


Conference32nd ASME Wind Energy Symposium - SciTech Forum and Exposition 2014
Country/TerritoryUnited States
CityNational Harbor, MD


  • Corotational framework
  • Ficticious masses
  • Geometrically non-linear Analysis
  • Structural modes
  • Wind turbine aeroelasticity


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