Abstract
The locally unsteady flow field near the orifice outlet of an aerostatic thrust bearing causes the gas pressure fluctuation on the bearing surface, which induces microvibration even if an invariable load acts on the bearing. In this article, flow field disturbance structure was designed for the air chamber of an aerostatic thrust bearing to change the microscopic flow field inside the bearing. Numerical calculation showed that flow field disturbance structure altered the gas flow characteristics in local flow field near the orifice outlet. Moreover, the fluctuating pressure on the bearing surface decreased obviously. Experiments demonstrated that the microvibration of the bearing with flow field disturbance structure was suppressed evidently. Furthermore, the influence of flow field disturbance structure parameters on the microvibration was analyzed experimentally.
Highlights
The pressurized gas effuses from orifice and shoots to the bearing surface when an aerostatic thrust bearing works as a supportive element
Compared with other microvibration suppression methods for an aerostatic thrust bearing, flow field disturbance structure (FFDS) had the merits of simple structure, easy manufacture, and better suppression effect
The parameters of the bearing with a conventional structure were the same as those discussed in section ‘‘Model of an aerostatic thrust bearing with FFDS and its flow field characteristics.’’ The inner diameter of FFDS d2 was 2, 3, and 4 mm (h3 = 0.1 mm, w = 0.2 mm)
Summary
The pressurized gas effuses from orifice and shoots to the bearing surface when an aerostatic thrust bearing works as a supportive element. Gas flow alters quickly as gas channel area increases suddenly and flow direction changes sharply.[1] The local flow field experiences complicated transformation (laminar flow transmits to turbulent flow and in an inverse order) and many vortices even negative pressure (relative to the bearing outlet) emerges in the air chamber.[2] The unsteady flow causes rapid fluctuation of the pressure on the bearing surface and induces the bearing microvibration in frequency varying from several hertz to several thousand hertz and in amplitude of sub-micrometers. Vibration isolation is less effective as the microvibration always occurs even if an inviable load acts on the bearing, whereas it may make the structure complicated and influence the static and dynamic performance of the bearing. The mechanism and corresponding suppression methods for the microvibration of an aerostatic thrust bearing have gained wide attention
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