Abstract
The spiral-grooved structure has been proposed for promoting the load capacity and stiffness of hybrid air journal bearings. In this paper, the dynamic characteristics of spiral-grooved hybrid bearings are first calculated. The stability criteria of the bearings are proposed and analyzed with different groove structure parameters using frequency domain analysis. It is found that the length of the spiral-groove has significant influence on the stability of the spindle system. Finally, the critical speed of the spiral-grooved hybrid bearing and rotor system is analyzed, and an experiment is carried out to validate the proposed model, finding that groove structure can promote the stability of the air bearing systems.
Highlights
In the field of optical lens processing, lens surface error is directly related to the spindle rotation error [1]
With the demand of high-speed and high-precision processing, the hybrid air bearings are widely applied in the high-speed and high precision spindles due to their inherent advantages: low friction, low vibration and low rotation error [2]
The hybrid air bearing is a special kind of air bearing in which the aerodynamic effect is equivalent with the aerostatic effect in high-speed conditions
Summary
In the field of optical lens processing, lens surface error is directly related to the spindle rotation error [1]. Chen et al [10] compared the stability of a spindle system with the orifices and inherences in the hybrid air bearing using the frequency domain analysis. Stanev et al [17] studied the influence of spiral grooves on high-speed aerostatic radial bearings and analyzed the influence of groove depth on dynamic and static performance and stability. The analysis on the effect of groove structure on the stability of the air bearings was limited and the influence of high speed was not mentioned in their study. The stability of spiral-grooved hybrid gas journal bearings in high- speed conditions is studied using frequency domain analysis. The stability of a spiral-grooved hybrid air journal bearing is studied at different rotational speeds and eccentricity ratios. The critical speed is calculated under certain bearings and an experiment on the critical speed of the bearing-rotor system is conducted to verify the proposed numerical simulation
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