高动载、大传动比风电增速箱能量空间分布特性及其对疲劳裂纹扩展的影响规律

"大型化和长寿命"是全球风电装备制造的发展趋势，也是行业共同面临的技术挑战。增速箱是引起风电装备停机时间最长、损失最大的关键部件之一。本项目以风电装备增速箱为研究对象，结合其高动载的工况和大传动比增速传动的结构特征，研究非平稳多源载荷下增速箱的动力学行为，重点研究增速齿轮箱内部激励、外部激励等多变量协同作用下的拍击振动形成机制及其对疲劳裂纹扩展的影响规律；在增速箱宏观动力学响应研究基础上，研究增速箱能量传递规律、损耗机理，确定能量空间分布特性，探索增速箱齿轮、轴承等关键零件上能量分布与关键结构损伤之间的影响关系，形成增速箱关键零件典型表面疲劳裂纹的扩展机制，提出高动载、大传动比增速箱优化设计方法，为我国大功率风电装备的设计开发提供理论支撑。

Large-scale and long-life are the development trends of global wind turbine equipment and common technical challenges in this industry. Gearbox is one of the key components which causes longest downtime and greatest loss of wind turbine. Taking wind turbine gearbox as the studying object, the dynamic behavior of gearbox is researched under non-stationary and multi-source loading condition, combining with the structure characteristic of large transmission ratio. The study on rattling vibration formation mechanism under multivariate synergy such as internal incentive and external incentive and its influence on fatigue crack growth mechanism is an emphasis. Then, energy transfer law and energy loss mechanism are explored based on the study of macroscopic dynamic response. Next, energy space distribution characteristic is analyzed to explore its influence on key structural damage. Finally, fatigue crack growth mechanism of typical surface is revealed, and optimization design method of gearbox with the characteristic of high dynamic load and large transmission ratio is put forward. The research will provide theoretical support for the design development of high-power wind turbine equipment.