Research on the influence of a micro-groove-orifice structure and its layout form on the static characteristics of aerostatic journal bearings under a high gas supply pressure

Abstract

To solve the problems of a low gas supply pressure and low load capacity of traditional orifice-compensated aerostatic journal bearings (OCAJBs), this paper presents the design of a double-row gas supply micro-groove-orifice aerostatic journal bearing (MGOAJB). By establishing new governing equations and introducing the SST k- ω turbulence model, the influence of the micro-groove-orifice (MGO) structure and its layout form on the static characteristics of aerostatic journal bearings under a high gas supply pressure are studied. It is found that under high gas supply pressure, the MGO structure can significantly improve the load capacity and stiffness and reduce the gas consumption of the MGOAJB compared with the OCAJB. With additional MGO structures in the eccentric direction of the spindle, the load capacity and stiffness of the bearing increase substantially, and the gas flow also increases. The layout direction of the MGO has a prominent influence on the static characteristics of the MGOAJB. Axial MGOs have a higher load capacity and stiffness and lower gas flow. The accuracy of the simulation method is verified by experiments. This study provides a theoretical basis and method for the design of aerostatic journal bearings under a high gas supply pressure.

Calculation and Analysis of Equilibrium Position of Aerostatic Bearings Based on Bivariate Interpolation Method

“…In addition, porous materials also have more applications because of their superior characteristics [6], and the commonly used material is graphite. Research on aerostatic bearings primarily focuses on topics such as bearing capacity, stiffness, stability, and flow rate [7,8]. The equilibrium position is an important basis for judging the stability of aerostatic bearings [9], and it is also the premise of analyzing the dynamic characteristic coefficients of aerostatic bearings under normal operation.…”

“…Figure 10 shows the experiment setup used to measure the equilibrium position, comprising the air supply system, the tested motorized spindle, and the TESA TT80 inductance micrometer. The air supply system is constructed by an air compressor (1), filter (3), globe value (4), solenoid throttle value (5), flowmeter (6), and pressure gauge (7). The inductance micrometer (accuracy 10 nm, range ±5 µm) is constructed with an inductive probe (9) and a digital display unit (11).…”