大兆瓦级风电齿轮箱耦合动态特性及结构噪声分析

风电齿轮箱是风电机组的重要组成部分，其动态性能的好坏直接影响整个机组的性能。建立了具有两级行星加一级平行轴齿轮传动的大兆瓦级风电齿轮箱齿轮-传动轴-轴承-箱体系统耦合非线性动力学有限元模型，采用Lanczos法对齿轮箱系统进行耦合模态分析。在综合考虑直斜齿轮时变啮合刚度、齿轮误差及齿轮啮合冲击等内部激励因素综合作用影响下，运用直接积分法对整个风电齿轮箱系统进行了动态响应求解，从而获得齿轮箱各点的振动位移、速度及加速度动态评价指标，并且对系统结构噪声进行了分析。研究结果可为大兆瓦级风电齿轮箱的动态性能优化提供参考。

Analyses of Dynamic Coupling Characteristics and Structural Noise of Multi-Megawatt Wind Turbine Gearbox

Wind-turbine gearbox was one of the most important components of wind-turbine, its dynamic performance had direct impact on the whole system. A coupled nonlinear dynamic FE model containing gears-shafts-bearings-housing for a multi-megawatt wind turbine gearbox of planetary gear transmission was built comprehensively to perform the coupled modal analysis of the whole gearbox with Lanczos method. In consideration of the nonlinear factors of the time-varying mesh stiffness of spur and helical gears, gear errors and gear mesh impact, the dynamic response of the system was studied using direct integration method under the effects of internal excitation. The vibration displacement, velocity and acceleration as the dynamic evaluation indexes of the wind turbine gearbox were obtained, and the structural noise was also analyzed. All results provide useful theoretical basis for dynamic optimization of multi-megawatt wind turbine gearbox system.