The Dynamic Response Of An Offshore Wind Turbine With Realistic Flexibility To Breaking Wave Impact

AuthorsErik Jan de Ridder, Pieter Aalberts Joris van den Berg, Bas Buchner (MARIN), Johan Peeringa (ECN)
Conference/Journal30th International Conference on Ocean, Offshore and Arctic Engineering (OMAE), Rotterdam, The Netherlands
DateJun 19, 2011

The effects of operational loads and wind loads on offshoremonopile wind turbines are well understood. For most sites,however, the water depth is such that breaking or near-breakingwaves will occur causing impulsive excitation of the monopileand consequently considerable stresses and displacements inthe monopile, tower and turbine. To investigate this, pilotmodel tests were conducted with a special model of an offshorewind turbine with realistic flexibility tested in (extreme) waves.This flexibility was considered to be necessary for two reasons:the impulsive loading of extreme waves is very complex andthere can be an interaction between this excitation and thedynamic response of the foundation and tower. The testsconfirmed the importance of the topic of breaking waves:horizontal accelerations of more than 0.5g were recorded atnacelle level in extreme cases.

stability, seakeeping and ocean engineeringwaves, impacts and hydrostructuralcfd developmentcfd/simulation/desk studiesmeasurements and controldata sciencetime-domain simulationsrenewablesoil and gasmodel testingextreme conditionssimulationrenewable energyrentwaveswind farms