Micro-vibration control of an aerostatic bearing with micro cylindrical array

• DOI: 10.1063/5.0250613
• Publication Date: 2025-01-17T17:29:17Z
• Authors: Cheng Cheng; Jiahuan Chen; Ming Zhao; Zhengxian Liu; Jialiang Xu; Guangyan Li; Yueting Hou; Weiling Zhao

Aerostatic bearings are widely used in the field of ultraprecision machining. It is well known that orifice restrictor with a recess has higher load capacity and stiffness than inherent restrictor. However, it inevitably brings more serious micro-vibration problem, which probably related to large-scale vortices recess. To this end, suppress aerostatic bearing vibration, we have designed novel micro cylindrical array (RMCA-I RMCA-II) smash vortices. Meanwhile, investigated vibration suppression effect through large eddy simulation method. The numerical results indicate could effectively break into small-scale vortices, amplitude RMCA-II significantly lower original bearing. Then, proper orthogonal decomposition been conducted further analyze flow mechanisms original, RMCA-I, bearings, respectively. be confirmed low-frequency lead vibrations, high-frequency after passing array. Eventually, adopted finite-time Lyapunov exponent (FTLE) method identify Lagrangian coherent structures FTLE indicates around cylinders derived from three-dimensional vorticity shedding.