Shape Optimization of the Aerostatic Bearing Considering Dynamic Performances

Abstract

The shape optimization is conducted to improve the dynamic performances of the aerostatic bearing with an air pocket. Firstly, the basic configuration of the air pocket used in the optimization is created, and four typical flow patterns are discussed. And then, the displacement impedance of the air film-floating facility system is studied, and the effects of bearing parameters on displacement impedance are discussed in detail. The approximate model of the displacement impedance is established; the optimization model is built based on the flow analysis, and both the Reynolds number and the maximum Mach number in the bearing clearance are considered in optimization to suppress the micro-vibration. The shape optimization is conducted and the optimum pocket configuration is achieved. Through optimization, the self-excited vibration is reduced, and the capability of the bearing to resist the external dynamic load is enhanced, which means that the operational stability of the aerostatic bearing is improved. The optimization process offers a reference for the bearing optimization in the engineering application.