CLASSIFYING RESONANT FREQUENCIES AND DAMPING VALUES OF AN OFFSHORE WIND TURBINE ON A MONOPILE FOUNDATION FOR DIFFERENT OPERATIONAL CONDITIONS

摘要

This paper shows the most recent results in the ongoing long-term monitoring campaign on an offshore wind turbine in the Belgian North Sea. Main focus will be on the behavior of the resonant frequencies and damping values of the fundamental modes over a full year, during which all relevant ambient and operational conditions have occurred. The latest results show that the damping values and resonance frequencies of the support structure are greatly influenced by the operating conditions of the turbine. We will therefore classify the dynamics of the turbine and provide the statistics for resonance frequencies and damping ratios for each operating condition.