风电机行星齿轮传动系统动态特性（英文）

Dynamic characteristics of planetary gear transmission for wind turbine

采用集中质量方法建立了1.5 MW风电机行星齿轮传动模型,在外载荷作用下采用线性弹簧来模拟轮齿间啮合,推导了行星齿轮各轮副间运动微分方程及动载系数的计算方法。在此基础上,分析了各种不同风况外载荷对系统的影响。结果表明:对于稳态风载荷,在其由小变大的过程中,啮合频率也会增大且能量最大;系统主要影响因子由刚度激励变为载荷激励,动载荷成分也变得比较丰富,出现低频带及边带频。极限阵风强度改变时,载荷瞬时变化,引起动载荷及动载系数激增;极限阵风方向改变时,x、y方向啮合力存在相位角,三个行星轮的外啮合之间有相位差,系统动载荷比阵风载荷增长1倍,轮齿间承载负荷变大。

In the present paper,an analytic model of the planetary gear transmission for the 1.5 MW wind turbine generator is established by using lump mass method,in which the linear spring is adopted to simulate the gear tooth meshing under the effect of external load.After that the differential equation of motion and the calculation method of dynamic load coefficient for each gear pair of planetary gear are derived.Based on the above conditions,the paper analyses the influences of various external load on the system.The following conclusion are drawn that the meshing frequency is to be enlargement on the increase of stable wind load,meanwhile,the energy of meshing frequency component is highest; As a result,the primary influence factor of whole system changes from the stiffness excitation to the load excitation; In addition the dynamic load component becomes various,with the low frequency band zone and side band frequency arising.Regarding extreme gust with changeable intensity,the external load undergoes instantaneous change,which leading to a surge of the dynamic load and its coefficient;Regarding extreme gust with changing direction,the meshing force between X-direction and Y-direction appears phase angle,besides,external meshing force along three planetary gears exists phase difference,resulting in that the growth ratio of dynamic load of system is to be once more than gust load and load carrying between gear teeth becomes larger.