动静压柔性铰链可倾瓦轴承的阶跃载荷动态响应

发布时间：2019-04-11 12:16

【摘要】：针对动静压柔性铰链可倾瓦轴承在受到阶跃载荷时主轴出现跳动而影响其回转精度的问题,提出了兼顾跳动幅值与稳定时间的分析方法和轴承优化设计方案。该方法基于轴心轨迹引入最大过冲量和过渡过程时间两个概念,用以描述主轴受到阶跃载荷时径向跳动的剧烈情况,研究轴承结构参数的确定方法。该方法首先建立轴承瓦块的压力分布模型、瓦块的力矩平衡方程和轴颈的运动方程,然后结合有限差分法和欧拉方法获取轴心轨迹,最后依据结构参数对两个参量的影响大小进行参数确定。仿真实验结果表明:增大预载荷或减小轴承半径间隙,能减小轴心最大过冲量并缩短过渡过程时间;减小静压油腔面积或油腔宽长比能减小最大过冲量;过渡过程时间随转速的提高呈现出先增加后减少的特点;在研究范围内,最大过冲量随着转速提高而增大;适当增大预载荷系数或减小半径间隙,能够提高主轴的回转精度。
[Abstract]:In view of the problem that the spindles of tilting tile bearing with dynamic and dynamic pressure are affected by the step load, an analysis method considering the run-out amplitude and the stability time is put forward, and the optimum design scheme of the bearing is put forward. In this method, the concepts of maximum overimpulse and transition time are introduced to describe the extreme radial runout of the spindle subjected to step load, and the method of determining bearing structural parameters is studied. Firstly, the pressure distribution model of the bearing tile block, the moment balance equation and the motion equation of the journal are established, and then the axis trajectory is obtained by combining the finite difference method and the Euler method. Finally, the parameters are determined according to the influence of the structural parameters on the two parameters. The simulation results show that the maximum overimpulse and the transition time can be reduced by increasing the preload or reducing the clearance of the bearing radius, and the maximum overimpulse can be reduced by decreasing the hydrostatic oil cavity area or the ratio of width to length of the oil cavity. The transition time increases at first and then decreases with the increase of rotating speed, the maximum over-impulse increases with the increase of rotational speed, and the rotation precision of the spindle can be improved by properly increasing the preload coefficient or decreasing the radius gap.
【作者单位】：山东大学机械工程学院;
【基金】：国家自然科学基金资助项目(51575318)
【分类号】：TH133.3

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