球形腔小孔节流空气静压轴承优化设计

针对球形腔小孔节流空气静压支承轴承,为提升其静、动力学性能,基于轴承间隙流场特性的分析结果进行优化设计.首先,采用数值仿真对轴承间隙,尤其气腔内的流动特性进行研究,分析其中跨音速流动特性及超音速区、漩涡流动等出现的机理,明确优化目标;其次,基于径向基神经网络模型,建立轴承力学性能关于设计参数的近似模型;最后,建立力学性...

Design Optimization of Aerostatic Bearing with Spherical Pocketed Orifice-type Restrictor

For the aerostatic bearing with the spherical pocketed orifice-type restrictor,the optimization is conducted to improve the static and dynamic performances based on the flow field analysis.Firstly,the flow characteristics in the bearing clearance,especially in the pocket,are investigated numerically.The occurrence mechanisms of the supersonic flow and the vortex flow are discussed,and the optimization objectives are determined.And then,the radial basis functions method is used to establish the approximate model which relating the design variables to the bearing performances.Finally,the optimization model is established.For a given bearing load,the maximum air film stiffness is achieved,and the micro-vibration is reduced.Also,the pneumatic hammer vibration is eliminated.For the multi-objective optimization problem,several bearing loads are considered,and the optimization results are achieved and discussed further.The flow field analysis and optimization modelling process for such kind of bearing can make a reference for the engineering design.