多工况下兆瓦级海上风电齿轮箱均载性能优化设计

针对兆瓦级海上风电齿轮箱行星级均载性能易受到时变非扭载荷影响的问题,该文提出了多风速工况下风电齿轮箱行星级均载性能优化方法。通过建立某型5 MW海上风电齿轮箱系统动力学模型,分析不同风速工况对其行星级内部激励和均载特性的影响规律,进而采用支持向量回归方法,重构风速工况齿轮修形参数均载系数之间的映射关系,建立考虑不同风速工况影响的齿轮箱行星级均载系数优化模型,实现多风速工况下行星级齿轮修形参数优化设计。研究结果表明：由风速工况变化造成的时变非扭载荷会使行星级的齿面和轴承出现偏载现象,并且在低风速工况时非扭载荷会显著降低行星级均载性能;优化后的风电齿轮箱在不同风速工况下其行星级内部激励均明显降低,齿面和轴承载荷分布更加均匀,均载性能得到明显提升。

Optimal design of load sharing performance of megawatt level offshore wind turbine gearbox under multi-operating conditions

The megawatt level offshore wind turbine gearbox is easily affected by the time-varying non-torque load. Aiming at this problem, this paper proposed a multi-wind speed condition optimization method for the planetary load sharing performance of the gearbox. By establishing the dynamic model of a 5 MW wind turbine gearbox system, the influence of wind speed conditions on the internal excitation and load sharing performance of the planetary was analyzed. Then, the support vector regression method was used to reconstruct the mapping relationship among wind speed conditions, gear modification parameters and load sharing coefficient. The optimization model of load sharing coefficient of the planetary considering the influence of different wind speed conditions was built to realize the optimization design of gear modification parameters. The results show that the time-varying non-torque load caused by wind speed conditions will produce the partial load on the tooth surface and bearing of the planetary stage, and it will significantly reduce the load sharing performance of the planetary stage at low wind speed conditions. Under different wind speeds, the internal excitation of the optimized wind turbine gearbox at the planetary stage is significantly reduced, and the tooth surface and bearing load distribution are more uniform, and the load sharing performance is significantly improved.