毛细管节流静压油膜轴承动态特性分析

Analysis on dynamic performance of hydrostatic oil film bearing throttled by capillary

针对毛细管节流的径向和推力静压油膜轴承,在对流经轴承各油腔流量模型进行线性化处理的基础上,建立了毛细管节流的静压轴承流量连续性方程及轴承主轴系统动力学方程,推导出毛细管节流的径向和推力静压油膜轴承的传递函数。采用MATLAB软件对毛细管节流的推力静压支承进行了仿真计算,仿真计算结果与广州机床研究所做实验的实测结果进行了详细的对比,有较好的一致性,说明所建模型和所采用方法的有效性。在实验验证的基础上,开展了主轴旋转速度对毛细管节流的推力静压轴承动态特性影响的仿真分析,同时探讨了供油压力、油膜厚度对毛细管节流的径向静压轴承动态特性的影响规律。

With the linearization of the flow in oil chambers,the continuity equation of flow and the dynamic equation of the shaft are built for the hydrostatic journal bearing and thrust bearing respectively.Next,the transfer functions of the two bearings with capillary throttle are deduced.Then,the performance of the two bearings is simulated in Matlab.In general,the simulation results are well matched to the experimental data provided by Guangzhou Machine Tool Research Institute.It indicates that both of the models can predict the dynamic characteristic of the two bearings.Finally,the dynamics response of the hydrostatic thrust bearing is studied in various rotational speed of the shaft.Also,the dynamic performances of journal bearing are simulated in changing of inlet pressure and thickness of oil film.