一种可承受径向和轴向载荷的超声悬浮轴承

基于压电驱动原理和超声波近场悬浮技术,提出了一种可同时承受径向和轴向载荷的超声悬浮轴承方案。此方案只依靠单一激励源即可实现双向支承,结构紧凑,控制简单。为准确预测超声轴承的工作频率和声阻抗,建立了超声轴承的声阻抗网络模型;利用有限元分析(FEA)方法,对超声轴承径向和轴向辐射面的振幅进行了仿真计算;研制了超声悬浮轴承原理样机并开展了轴承悬浮承载能力测试实验。实验结果表明:超声悬浮轴承具有良好的悬浮效果,可承受较大的径向载荷和一定的轴向载荷。此类超声轴承的研究可为未来新型轴承结构的研发开拓新的思路。

An ultrasonic levitating bearing supporting radial and axial loads

An ultrasonic bearing that can support radial and axial loads simultaneously is proposed based on piezoelectric-driven principle and ultrasonic levitation technology.Supporting in two directions can be achieved only relying on single excitation source,which brings about compact structure and simple control.To predict the ultrasonic bearing's working frequency and acoustic impedance,acoustic impedance network of ultrasonic bearing is modeled.Finite element analysis (FEA) method is adopted to calculate the amplitude on radiating surface of the ultrasonic bearing.In order to verify the ultrasonic bearing's performance,a prototype is developed and levitating capability experiments are conducted.Results in the experiments demonstrate that the ultrasonic bearing shows good suspending performance and is able to support larger radial loads and certain axial loads simultaneously.The design of this kind of ultrasonic bearing will open up a new way to develop novel bearing structure in the future.