国外文献 > 1.轴承 > 1. 基础理论与机制 > 动力学与稳定性
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| 标 题： |
A comprehensive analysis of factors affecting the accuracy of the precision hydrostatic spindle with mid-thrust bearing layout
对中推力轴承布局影响精密静压主轴精度因素的综合分析 |
| 作 者： |
Fang, Chenggang
Huo, Dehong
Huang, Xiaodiao |
| 关键词： |
Precision hydrostatic spindle [精密静液压主轴]
Rotor coaxiality error [ 转子同轴度误差]
Runout [ 跑偏]
Amplitude amplification factor [ 增益放大倍数]
Dynamic coefficients [ 动态系数] |
| 出版年： |
2021 |
| 期刊名： |
The International Journal of Advanced Manufacturing Technology
先进制造技术国际期刊 |
| 年卷期： |
2021, vol.114, no.3/4 |
| 摘 要： |
This paper investigates the influence of rotor coaxiality error on spindle accuracy under different operating conditions in the precision hydrostatic spindle with a mid-thrust bearing structure. Firstly, a linearized model of rotor dynamics equation with five degrees-of-freedom is established based on Newton's law of motion and angular momentum principle. Then, by solving the Reynolds equation and the flow continuity equation using the mathematical perturbation method, the steady and transient pressure distribution functions of the hydrostatic bearings are obtained; subsequently, the stiffness and damping coefficient matrices of the spindle are determined. Furthermore, the linearized stiffness and damping coefficients are substituted into the rotor dynamics equation to obtain the instantaneous acceleration of the rotor, and the motion trajectory of the rotor is solved iteratively by the Euler method. Finally, the paper studies the influences of different rotor coaxiality, rotating speed, cutting load, oil supply pressure, and oil film clearance on dynamic characteristics, amplitude amplification factor, and radial runout of the spindle by computer simulation. The simulation results show that the spindle runout is more sensitive to rotor coaxiality error and oil film clearance.
本文研究了在不同运行条件下，中轴向轴承结构的精密静压主轴中转子同轴度误差对主轴精度的影响。首先，基于牛顿运动定律和角动量原理，建立了具有五个自由度的转子动力学线性化模型。然后，通过数学扰动法求解雷诺方程和流体连续性方程，得到了静压轴承的稳态与瞬态压力分布函数； 随后，确定了主轴的刚度和阻尼系数矩阵。进一步将线性化的刚度和阻尼系数代入转子动力学方程，得到转子的瞬时加速度，并采用欧拉法迭代求解转子的运动轨迹。最后，通过计算机仿真研究了不同转子同轴度、转速、切削载荷、供油压力以及油膜间隙对主轴动态特性、振幅放大倍数和径向跳动的影响。仿真结果表明，主轴跳动对转子同轴度误差和油膜间隙更为敏感。 |
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