风电装备行星轮系过盈接触特性分析

风力发电对于保障我国能源安全具有重大意义,但我国风电装备发展中还存在巨大技术瓶颈,如何进一步提高装备可靠性及寿命是亟需解决问题。以行星轮系过盈配合面接触特性与微动磨损关系为切入点,针对NGW型行星轮受力分析,计算获取过盈配合接触分析的载荷边界条件;通过对比不同过盈量在无外载工况下的配合面压力值,理论计算与仿真分析结果的平均误差约为5.74%,验证了仿真的可信度;通过对比不同过盈量在无外载下的变形量,行星轮内孔面与轴承外圈变形占比分别为89.5%和10.5%,定量描述了行星轮相较于轴承的变形程度,更易损伤;稳态载荷工况下,通过对比不同配合公差P6和R6下的最大微动滑移量可知,P6公差带下最大微动量随载荷变化幅度较大,因此风电行星轮配合公差应选R6更合适;非稳态载荷工况下,通过数值积分计算获取不同过盈量下的配合面打滑极限载荷,该极限值作为评定实际服役工况下出现剧烈"打滑现象"的准则,因此设计时应考虑该极限工况。

Interference contact characteristics of planetary gear train for wind turbines

Wind power generation has a great significance for ensuring our country’s energy sources security,but there still is a huge technical bottleneck.So,how to further improve wind turbine’s reliability and service life is an urgent problem to be solved.Here,the relationship between the contact characteristics of interference fitting surfaces and fretting wear was taken as a break through point,and the load boundary conditions were calculated based on the stress analysis of NGW type planetary gear.By comparing stress values of a fitting surface under the conditions of different interferences and no external load,it was shown that the average error between the theoretical calculation and simulation analysis is about  5.74%, it verifies the reliability of the simulation; through comparing the deformation quantities of the fitting surface under the conditions of different interferences and no external load,the deformations of the planetary gear inner hole surface and the bearing outer ring occupy 89.5% and 10.5%,respectively; so,the planetary gear is easier to be damaged than the bearing be; through comparing the maximum fretting slips under the conditions of P6 and R6 fitting tolerances and steady state load,the maximum fretting slip of P6 varies greatly with the load variation and that of R6 is more suitable to planetary gear tolerance; with numerical integration under the condition of non-steady state load,the slip limit loads of the fitting surface under different interferences are calculated,and there limit values should be considered in the design,because these limit values are taken as a criterion to evaluate the severe “slipping phenomenon” in actual service conditions.