半球型动压气体轴承关键尺寸影响分析

Analysis of the Effects of Critical Dimension About Hemisphere-Type Hydrodynamic Gas-Lubricated Bearings

在雷诺方程和惠普尔平行槽对称压力分布理论的基础上,建立半球型动压轴承的分析模型。以某型号高精度三浮陀螺用半球型动压轴承结构参数特征为例,通过改变半球轴承结构参数,分析了输出指标的变化规律。结果显示,轴承半径与输出指标呈线性变化规律,轴承螺旋槽结构参数与轴承的力学性能呈非线性关系,轴承间隙对轴承的刚度特性呈幂指数关系。计算结果与测试结果进行了对比,其误差在20%以内。

Based on the Reynolds equation and the symmetric pressure distribution theory of Whipple parallel groove,the analytical model of hemispherical hydrodynamic bearings was established.The structural parameter characteristics of a hemispherical dynamic pressure bearing used in a high-precision three-float gyro were taken as an example,the changes of output parameters were analyzed by adjusting the structural parameters of the hemispherical bearing.The results show that spiral groove have a nonlinear relationship with the mechanical properties of bearing,and the clearance has a power exponential image on the bearing stiffness.The calculated results were compared with the experiment ones,the error was within 20%.