Numerical investigation of static and dynamic characteristics of aerostatic thrust bearings with small feed holes

Dynamic characteristics of ultra-precision aerostatic bearings

“…The dynamic instability of the air bearing, e.g., self-excited vibration (''pneumatic hammer''), was considered in early studies [1]. For high speed moving applications, some new configuration designs were proposed to improve dynamic stiffness and damping coefficients of aerostatic bearings [2][3][4]. There were also qualitative analyses of the compressible thin air films in gas lubricated components, which indicated the dependence of their dynamic characteristics on the excitation frequency [5].…”

“…Numerical techniques, such as finite difference method (FDM) [4] and finite element method (FEM) [6], have been adopted in the study of dynamic characteristics of aerostatic bearings. In this paper, a dynamic mesh modeling technique using commercial CFD software is proposed to investigate dynamic characteristics of multirestrictor aerostatic bearings with shallow recesses.…”

Numerical analysis of discharge coefficients in aerostatic bearings with orifice-type restrictors

“…The Reynolds equation can be solved easily by using the finite difference method (FDM) in a numerical model; however, the accuracy of each model is dominated by the orifice discharge coefficient. This discharge coefficient is generally a predetermined number [1][2][3] and can be calculated based on experimental results [4][5] or results of CFD simulations [6][7][8].…”

“…Miyatake and Yoshimoto [6] analyzed aerostatic bearings composed of small feed holes by investigating the effects of the orifice diameter and number of feed holes on bearing performance. They also compared FDM calculations with the results of CFD simulations to determine the discharge coefficient.…”

“…One flow model considers the feed holes as orifice restrictor and the other model considers the feed holes as inherently compensated restrictor [6]. The orifice flow models can affect the value of discharge coefficient.…”