Supporting parameter optimization of offshore wind turbine drivetrain considering elastic supports under multiple operation conditions
The elastically supported offshore wind turbine drivetrain is the critical transmission equipment to transmit megawatt-level power.Under the couplings of stochastic wind and waves,its dynamic characteristics will be affected by the combined effects of stochastic aerodynamic loads and inertial loads caused by the large-scale motion of the supporting platform,leading to complex vibration characteristics.To reduce the influence of stochastic wind and waves on the vibration responses of the offshore wind turbine drivetrain,taking a 6.2 MW offshore wind turbine drivetrain as the research object,a rigid-flexible coupling dynamic model of the elastically supported offshore wind turbine drivetrain is established.The mapping relationships among the operation condition parameters,supporting parameters,and vibration responses of the key components are constructed through the surrogate model,and then the optimization model of the elastic support parameters of the offshore wind turbine drivetrain under multiple operation conditions is constructed.The optimization effects under the multiple operation conditions are compared.The results show that the increase of the nacelle motion and input torque will significantly enlarge the vibration responses of the main shaft bearing and the generator stator.The elastic support parameter optimization can effectively weaken these influences on the vibration responses of the main shaft bearing and the generator stator,and its improvement effect becomes more significant as the average wind speed increases.This study has important theoretical reference significance for improving the long-term stable operation ability of the floating wind turbine drivetrain under the couplings of stochastic wind and waves.
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