空气压缩机用高重合度斜齿轮副的疲劳寿命分析

Fatigue Life Analysis of High Contact Ratio Helical Gears in Air Compressor

针对现役空气压缩机用斜齿轮副的疲劳寿命预测问题,提出了一种基于CAE协同仿真技术的快速疲劳寿命预测方法。采用在ANSYS软件中建立高重合度斜齿轮副的三维静态非线性接触的多齿有限元模型,对齿轮副进行应力计算,进而采取齿廓修形以改善由于啮入或啮出冲击所引起的齿顶应力集中情况。在动力学分析软件ADAMS中得出载荷谱,并利用疲劳分析软件FE-SAFE对斜齿轮副的疲劳寿命做出预测。研究结果表明:齿廓修形可有效地降低啮入啮出冲击;ADAMS可以快速地获得载荷谱,修形后的斜齿轮副寿命能够满足设计要求,且与实际疲劳损伤情况相符。

For the fatigue life prediction of helical gear pair in air compressor, a rapid fatigue life prediction method based on CAE collaborative simulation technology is presented in this paper. The three-dimensional nonlinear finite element model of the high contact ratio helical gears is established using ANSYS software to calculate the stress distribution, then meshing impact is reduced by profile modification. Combined with the actual approximate load spectrum obtained by using ADAMS software, fatigue life predictions is carried out using FE-SAFE software based on the theory of fatigue damage. The results show that tooth profile modification can effectively reduce large shocks caused by elastic deformation during meshing, load spectrtma can be quickly obtained by uisng ADAMS software the fatigue life of helical gear pair after modification can meet the design requirements and be consistent with the actual situation.