中文摘要：

建立了风电增速箱输出级斜齿轮副的三维接触有限元模型,计算了静载荷作用下齿轮副的应力应变;基于齿轮材料的疲劳试验常数,计算了材料的近似S-N曲线;对风电增速箱真实载荷谱20种工况的载荷历程进行雨流计数,得到载荷循环数、均值与幅值的关系。在FE-SAFE软件中,对斜齿轮副接触模型进行疲劳寿命分析,研究了载荷、表面粗糙度、残余应力以及轮齿修形量对齿轮副疲劳寿命的影响规律。结果表明,齿轮副应力集中处有少数低寿命点,齿轮副寿命随载荷及齿面粗糙度的增大而减小,残余拉应力使疲劳寿命减小,而残余压应力可使疲劳寿命增大,适度修形可提高齿轮的疲劳寿命。

英文摘要：

3D contact finite element model of output helical gear pair of wind turbine speed-increase gearbox is built to calculate stress-strain of gear pair under static load. S-N curves of gear pair materials are calculated based on fatigue test constants of materials. After carrying out rain-flow counting for load histories of real load spectrum in 20 working conditions of the gearbox, the relation of load cycles, mean value and amplitude of the load are obtained. Fatigue life of helical gear pair is analyzed with FE-SAFE to study the influence of magnitude of load, residual stress, tooth surface roughness and profile modification to fatigue life of gear pair. The results indicate that there are a few short life points at places where stress concentrates; the life of gear pair extends with the decrease of load or tooth surface roughness; residual tensile stress leads to a reduction of fatigue life while residual pressure stress leads to extension;the life of gear pair extends with proper tooth modification.