Author/Authors :
Li, Y. F Institute of Systems Engineering - China Academy of Engineering Physics, Mianyang, China , Yin, Y. H Institute of Systems Engineering - China Academy of Engineering Physics, Mianyang, China , Yang, H Institute of Mechanical Manufacturing Technology - China Academy of Engineering Physics, Mianyang, China , Liu, X. E Institute of Systems Engineering - China Academy of Engineering Physics, Mianyang, China , Mo, J Institute of Systems Engineering - China Academy of Engineering Physics, Mianyang, China , Cui, H. L Institute of Mechanical Manufacturing Technology - China Academy of Engineering Physics, Mianyang, China
Abstract :
For an aerostatic circular thrust bearing with a single pocketed orifice-type restrictor, the flow field in the
bearing clearance is analyzed numerically, and the formation mechanism of the bearing micro-vibration is
investigated. Through flow field analysis, the flow structures in the bearing clearance are discussed and
classified. The formed vortex flow in flow field is analyzed, and the influence of the vortex flow on bearing
dynamic stability related to micro-vibration is discussed. For each flow structure, the vortex flow always
exists and induces the bearing micro-vibration. The Reynolds number is used to represent the degree of
bearing micro-vibration and the rationality is verified. Based on the flow analysis results, the maximum
Reynolds number in the bearing clearance flow field is taken as the optimization objective to reduce the
micro-vibration amplitude, the approximate model for design optimization is established by using the radial
basis functions method and the optimization methodology is illustrated. Several cases of optimization are
carried out with different given bearing loads. Through optimization, the maximum Reynolds number is
reduced greatly, which means the enhancement of the bearing dynamic stability. The optimization results
show that in order to suppress the micro-vibration, the air supply pressure should be kept as small as possible,
the small air pocket diameter and orifice diameter are also needed.
Keywords :
Design optimization , Dynamic stability , Micro-vibration , CFD simulation , Aerostatic bearing , Gas lubrication
