The design of modern wind turbines is typically based on lifetime analyses using aeroelastic codes. In this regard, the impedance of the foundations must be described accurately without increasing the overall size of the computational model significantly. This may be obtained by the fitting of a lumped-parameter model to the results of a rigorous model or experimental results. In this paper, guidelines are given for the formulation of such lumped-parameter models and examples are given in which the models are utilised for the analysis of a wind turbine supported by a surface footing on a layered ground. The importance of including an accurate model of the dynamic soil-structure interaction in an aeroelastic code is discussed. Furthermore, the sensibility of the response to changes in the soil properties is examined.
Proceedings of the Eleventh International Conference on Civil, Structural and Environmetal Engineering Computing, 2007