针对高精密陀螺电机气体润滑动压轴承间隙复杂流动特点,分析轴承的静态特性和推导一阶滑移边界条件。采用基于无滑移边界和一阶滑移边界条件的计算流体力学方法模拟气体润滑动压轴承间隙复杂流动,计算获得不同偏心距轴承的静态载荷、刚度、功率和偏位角等参数,并与轴承试验结果进行对比分析。研究结果得出,在自重条件下轴承试验测量刚度结果位于无滑移和滑移边界条件数值模拟结果之间,比无滑移边界条件计算结果小约10%,比一阶滑移边界计算结果大约44%,表明轴承间隙流动只存在局部滑移;数值模拟结果的偏位角方向与试验结果一致,分别相差4°和2.6°左右。研究结果可为陀螺电机气体润滑轴承设计提供技术参考。
陈广强
,
杨云军
,
雷娟棉
,
陈冰雁
,
刘周
. 锥台型气体润滑动压轴承动力学数值模拟研究[J]. 机械工程学报, 2016
, 52(4)
: 185
-191
.
DOI: 10.3901/JME.2016.04.185
An analysis of static and clearance flow characteristics for the cone self-acting gas lubrication bearing of high precision gyro motor and deduction of first order slip boundary conditions are presented. The computation fluid dynamics based on boundary conditions of no slip and the first-order slip are used to make numerical simulation of clearance complex flow for the bearing. Static loads, stiffness, powers and offset angles with different eccentricity of the bearing, the results are compared with experiment results of the bearing. Study results show that the experiment measurement results stiffness of the bearing in the weight condition are between the results of numerical simulation with no slip and first-order slip boundary conditions, experiment data less than about 10% with the calculation results from no slip boundary conditions, and more than 44% with the calculation results from first slip boundary conditions, which shows that slip phenomenon partly existed in clearance flow of the bearing. The offset angle orientation of numerical simulation is consistent with the experiment data, differences of 4° and 2.6° respectively. The research results could provide reference for the design of gas lubricated bearings of the gyroscope motor.
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