空气静压止推轴承自激微振动数值分析及实验研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (16) : 224-232.

论文

龙威，王继尧1，李法社2，吴蜜蜜1，邓伟3

作者信息 +

Numerical analysis and experimental research on self-excited micro-vibration of aerostatic thrust bearings

LONG Wei1，WANG Jiyao1， LI Fashe2， WU Mimi1， DENG Wei3

Author information +

文章历史 +

摘要

随着控制精度和工作稳定性要求的不断提高，空气静压轴承气膜内部的自激振动成为制约气浮系统进一步发展的关键问题。以圆盘型中心供气小孔节流空气静压轴承气膜内的三维自激微振动为研究对象，基于流体润滑理论和修正的速度滑移边界建立了气膜的动力学模型和自激振动方程；基于平面流函数和大涡模拟方法，在确定气膜微振动形成机理的基础上，分析了三维气旋涡量分布特征和速度场变化规律；最后通过实验测试了气膜自激微振在三轴方向上的时域和频域特性，并分析了各轴向自激微振动的影响因素。研究表明：空气静压止推轴承的自激振动是气膜流场内三维气旋共同形成的，且沿气膜高度方向（z方向）的振动强度显著大于水平面内（x、y方向）的振动；轴承气膜内三个方向的自激振动强度都随着供气压力的增加而增加，且x、y方向自激振动的强度较z方向更为敏感；轴承气膜内三个方向自激振动的固有频率会随着供气压力的变化而改变，其中x、y方向自激振动的固有频率随供气压力增加而增长，而z方向自激振动的固有频率随供气压力的增大基本不变。

Abstract

With the continuous improvement of control accuracy and working stability, the self-excited vibration in the air film of aerostatic bearing has become the key problem restricting the further development of air flotation system. Taking the three-dimensional self-excited micro-vibration in the film of disc type central air supply orifice throttle air hydrostatic bearing as the research object, the dynamic model and self-excited vibration equation of the film were established based on the fluid lubrication theory and the modified velocity slip boundary. Based on the plane flow function and the large eddy simulation method, the characteristics of three-dimensional gas vortex vorticity distribution and the variation of velocity field were analyzed on the basis of determining the formation mechanism of gas film microvibration. Finally, the time domain and frequency domain characteristics of gas film self-excited micro-vibration in triaxial direction were tested by experiments, and the influencing factors of each axial self-excited micro-vibration were analyzed. The results showed that the self-excited vibration of the aerostatic thrust bearing is formed by three-dimensional gas vortexs in the film flow field, and the vibration intensity along the film height direction (z direction) is significantly higher than that in the horizontal plane (x, y direction). The intensity of self-excited vibration in the three directions of bearing film increases with the increase of gas supply pressure, and the intensity of self-excited vibration in x and y directions are more sensitive than that in z direction.The natural frequency of the self-excited vibration in the x and y directions will increase with the increase of the gas supply pressure. While that in z direction is basically unchanged with the increase of gas supply pressure.

导出引用

龙威,王继尧1，李法社2，吴蜜蜜1，邓伟3. 空气静压止推轴承自激微振动数值分析及实验研究[J]. 振动与冲击, 2019, 38(16): 224-232

LONG Wei1，WANG Jiyao1， LI Fashe2， WU Mimi1， DENG Wei3. Numerical analysis and experimental research on self-excited micro-vibration of aerostatic thrust bearings[J]. Journal of Vibration and Shock, 2019, 38(16): 224-232

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