Structural dynamics of wind turbines
نویسنده
چکیده
Structural dynamics of wind turbines aims at assessing the integrity and reliability of the complete construction against varying external loading over the targeted life time. Since wind induced excitation is the most important, structural dynamics is closely connected to aeroelasticity. Most of structural analysis is based on modelling while tests are reserved for prototype assessment. To this end elastic modelling at component level and dynamic modelling of the complete system are required. The aim of the present chapter is to provide an overview on the theory and approximation tools of structural dynamic analysis of modern wind turbines on these two aspects. At component level beam models of varying complexity are discussed while at system level the multi-body approach is defi ned and its use in formulating the dynamic model of the complete wind turbine is explained. Next, after a short introduction to aeroelastic coupling, the issue of stability is outlined. Finally some indicative results show the kind of information structural analysis can provide. The focus of the presentation is on the procedures rather than the details of derivations for which appropriate pointers to the literature are given.
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