Abstract
An offshore wind turbine coupling (OWTC) safety performance assessment method for torque transfer and overload protection of the main drive train of offshore wind turbine is proposed in the paper. First, the local mechanical model and the overall finite element model of the OWTC are established, and the fatigue life assessment method of the OWTC is given. Then, the effectiveness of the proposed method was verified by experiments and finite elements. The structural strength under different working conditions of the OWTC and the influence of the bolt tightening torque on the OWTC slip torque are studied, and the torque transfer efficiency is evaluated. Finally, the stress response of the OWTC was obtained by the finite element method considering the time-series torque load, the fatigue life of the OWTC was evaluated by combining the S/N curve parameters and the Palmgren-Miner rule. The results show that the proposed method for assessing the safety performance of the OWTC is reliable and valid. The calculated results of the local mechanical model are in good agreement with the test and simulation results, and the connecting rods and bolts of the OWTC are highly susceptible to damage under fatigue loading and should be of particular concern.
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