超声轴承用压电换能器结构设计与有限元分析

提出了一种超声轴承用新型径向挤压式压电换能器,对换能器的机电特性进行了有限元分析。明确了有限元建模方法,从模态分析角度分析压电换能器的谐振频率和径向最大振幅,依据模态分析结果对压电换能器的幅频特性进行谐响应分析,采用正交试验法对换能器结构进行优化设计,制作最佳结构压电换能器样机,并进行工作频率测试。实验结果表明,换能器径向振动谐振频率的有限元计算值与实验结果具有良好的一致性,证明了有限元计算的正确性,为超声轴承用压电换能器的设计研究提供重要价值。

Finite Element Analysis and Physical Design of Piezoelectric Transducer for Ultrasonic Bearing

A new type of radial extrusion piezoelectric transducer for ultrasonic bearing was proposed,and its mechanical and electrical characteristic was analyzed by the finite element method.The finite element modeling method was ascertained.The harmonic frequency and radial maximum amplitude of piezoelectric transducer was analyzed from the perspectives of the modal analysis.According to the results of modal analysis, the amplitude frequency characteristics of piezoelectric transducer were calculated by the harmonic response analysis. The structure of piezoelectric transducer was optimized by the orthogonal method, thus a prototype of transducer with best structure was fabricated and the operating frequency was tested.The experimental testified that the finite element calculation result of harmonic frequency of transducer was well consistent with the result of experimental result,which proved an important value for design and research of piezoelectric transducer for ultrasonic bearing.