Licentiate seminar

Simulating Dynamical Behaviour of Wind Power Structures

Defendant Main Advisor Extra Advisor Date
Anders Ahlström Anders Eriksson 2002-10-24

Lars Bergdahl, CTH, Water Environment Transport

Evaluation committee


The work in this thesis deals with the development of an aeroelastic simulation tool for horizontal axis wind turbine applications. Horizontal axis wind turbines can experience significant time varying aerodynamic loads, potentially causing adverse effects on structures, mechanical components, and power production. The need of computational and experimental procedures for investigating aeroelastic stability and dynamic response have increased as wind turbines become lighter and more flexible. A finite element model for simulation of the dynamic response of horizontal axis wind turbines has been developed. The simulations are performed using the commercial finite element software SOLVIA, which is a program developed for general analyses, linear as well as non-linear, static as well as dynamic. The aerodynamic model, used to transform the wind flow field to loads on the blades, is a Blade-Element/Momentum model. The aerodynamic code is developed by FFA (The Aeronautical Research Institute of Sweden) and is a state-of-the-art code incorporating a number of extensions to the Blade-Element/Momentum formulation. SOSIS-W, developed by Teknikgruppen AB was used to develop wind time series for modelling different wind conditions. The model is rather general, and different configurations of the structural model and various type of wind conditions could easily be simulated. The model is primarily intended for use as a research tool when influences of specific dynamic effects are investigated. Simulation results for the three-bladed wind turbine Danwin 180 kW are presented as a verification example.
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