4级行星齿轮箱振动噪声预估及修形效果分析

Vibration noise prediction and tooth modification effect analysis of a four-stage planetary gearbox

为研究修形前后多级行星齿轮箱在复杂激励作用下的振动噪声,以海洋平台升降齿轮箱为对象,建立了耦合4级行星轮系、轴承和箱体的齿轮箱有限元模型,分析了齿轮箱的振动模态;采用静动力接触有限元法求解了修形前后齿轮副的内部动态激励,在此基础上提出了考虑轮齿修形的齿轮箱振动噪声预估方法,利用模态叠加法分别计算了轮齿修形前后齿轮箱的振动响应,并采用声学边界元法对齿轮箱的辐射噪声进行预估。结果表明:修形后4级行星齿轮箱的振动噪声明显降低,对比振动噪声仿真与实测结果,两者吻合良好。

In order to investigate the vibration noise of multi-stage planetary gearbox under complex excitation before and after tooth modification, with taking the lifting gearbox of an offshore platform as the research object, a finite element model of the gearbox including coupling four-stage planetary gear train, bearings and housing is established, and vibration mode of the gearbox is analyzed. Internal dynamic excitations of gear pairs before and after tooth modification are solved by static and dynamic contact finite element methods, then a vibration noise prediction method considering tooth modification is developed, vibration responses of the gearbox before and after tooth modification are solved by mode superposition method, and accordingly radiation noise of the gearbox is predicted by acoustic boundary element method. The results show that the vibration noise of the four-stage planetary gearbox after modification are decreased apparently, and calculated vibration noise is in good agreement with experimental values.