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<p>This study investigates the effect of shaft rotation on the load capacity of hydrostatic gas bearings designed for high-speed rotating systems operating in contamination-sensitive environments, such as medical and precision equipment. Two types of bearing configurations were considered: axial slot-type and circumferential slot-type hydrostatic gas bearings. Based on CAE simulations that incorporate rotational motion, the flow characteristics and restoring forces acting on the shaft were obtained under eccentric and dynamic conditions. In addition, an experimental apparatus was developed to quantitatively evaluate the effect of shaft rotation on the load capacity by direct measurement. Due to the inherently low viscosity of air, variations in rotational speed up to 10000 rpm were found to have a negligible effect on both load capacity and mass flow rate. Comparative analysis demonstrated that the axial slot-type configuration exhibited higher load capacity and superior vibration suppression performance of the shaft compared to the circumferential slot-type.</p>

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Effect of rotation on load capacity in slot restrictor hydrostatic air bearings

  • 期刊论文

  • 发表日期：

    2026年1月10日

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  • Shinji Kajiwara,
  • Naoki Okuda,
  • Tomoya Kinugawa,
  • Shinya Kikutani

摘要

This study investigates the effect of shaft rotation on the load capacity of hydrostatic gas bearings designed for high-speed rotating systems operating in contamination-sensitive environments, such as medical and precision equipment. Two types of bearing configurations were considered: axial slot-type and circumferential slot-type hydrostatic gas bearings. Based on CAE simulations that incorporate rotational motion, the flow characteristics and restoring forces acting on the shaft were obtained under eccentric and dynamic conditions. In addition, an experimental apparatus was developed to quantitatively evaluate the effect of shaft rotation on the load capacity by direct measurement. Due to the inherently low viscosity of air, variations in rotational speed up to 10000 rpm were found to have a negligible effect on both load capacity and mass flow rate. Comparative analysis demonstrated that the axial slot-type configuration exhibited higher load capacity and superior vibration suppression performance of the shaft compared to the circumferential slot-type.