基于梳状扇形孔周期性结构的纵-扭复合模态超声振动系统  

Longitudinal-torsional composite modal ultrasound vibration system with periodic structure of comb sector holes

作　　者：林基艳 林书玉[1] LIN Jiyan;LIN Shuyu(School of Physics and Information Technology,Shaanxi Normal University,Xi’an 710119,Shaanxi,China;School of Information Engineering,Yulin University,Yulin 719000,Shaanxi,China)

机构地区：[1]陕西师范大学物理学与信息技术学院,陕西西安710119 [2]榆林学院信息工程学院,陕西榆林719000

出　　处：《声学技术》2020年第5期567-573,共7页Technical Acoustics

基　　金：国家自然科学基金(11674206、11874253、11964040)资助项目。

摘　　要：纵-扭超声振动系统可以提高加工效率与精度、增加表面强度,因而日益受到青睐,但是现有的纵-扭振动系统存在扭转分量较小,转化效率低等问题,基于此,论文对基于周期性结构的复合模态超声振动系统进行了研究,通过有限元仿真对复合模态周期性结构换能器的振动模态、谐振频率等特性进行分析验证。研究结果表明,两维梳状扇形孔周期和斜槽结构,可以增大纵、扭振振幅,位移旋度和剪切应力以及法向应力等,从而提高纵-扭转化能力。Longitudinal-torsional ultrasonic vibration system is becoming more and more popular because it can improve machining efficiency and accuracy and increase surface strength.However,the torsional vibration component of the existing longitudinal-torsional vibration system is small and the conversion efficiency is low.Based on this,the composite modal ultrasonic vibration system with periodic structure is proposed in this paper,and its vibration modes,resonant frequency and other characteristics are analyzed and verified by numerical simulation.The results show that the two-dimensional periodic structure of comb sector holes and skewed slots can increase the longitudinal and torsional amplitudes,displacement curl,shear stress and normal stress,and improve the longitudinal-torsional conversion ability.

关 键 词：纵-扭复合模态 周期性结构 斜槽 谐振频率 有限元仿真 

分 类 号：O426.2[理学—声学]