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Support structures of offshore wind turbines are exposed to high dynamic loads caused by wind, waves and operation. The support structures have to resist an extreme number of load cycles during their design life. Therefore, fatigue resistance becomes relevant for providing secure service time and economic design. As a result of growing turbine capacity and adverse offshore conditions, components which are involved in the load transfer need to be checked for fatigue in detail. This paper gives an overview of actual types of support structures, particular character of dynamic loads and fatigue resistances of specific constructional details.Keywords: Offshore wind turbine / wind loads / wave loads / fatigue / welded joints / grouted joints /

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We present an initialization procedure for the recursive least‐squares (RLS) algorithm that has almost the same form as the RLS algorithm itself and which is exact in the sense that the so‐initialized RLS estimate coincides with the batch LS estimate as soon as the latter exists. Copyright © 2002 John Wiley & Sons, Ltd.