面向超声喷丸的纵弯复合换能器设计与分析  

Design and analysis of ultrasonic peening transducer with longitudinal-flexural mode

作　　者：芦小龙[1] 施陆锴 李武琴 Lu Xiaolong;Shi Lukai;Li Wuqin(State Key Laboratory of Mechanics and Control for Aerospace Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学航空航天结构力学及控制全国重点实验室,南京210016

出　　处：《东南大学学报（自然科学版）》2023年第3期537-542,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51975278);机械结构力学及控制国家重点实验室基金资助项目(MCMS-I-0321G01);国家商飞制造工程技术研究中心创新基金资助项目(COMAC-SFGS-2020-3);南京航空航天大学科研与实践创新计划资助项目(xcxjh20220114).

摘　　要：为解决当前超声喷丸枪在狭小空间内难以加工壁板的问题,设计了一种纵弯复合模态的夹心式压电超声喷丸换能器.采用COMSOL仿真软件,对换能器进行模态分析,计算得到纵振和弯振的谐振频率,并改变尺寸使换能器在2种模态下均呈现较大的振幅.采用多普勒测振仪对换能器工作端面扫频,纵振与弯振振幅分别为1.0和0.8μm,经匹配后振幅各增长了40%和50%.利用激光位移传感器测得2种模态下撞针振幅均可到达1.2 mm.同时,对2024-T351铝合金板件进行了超声喷丸成形试验,并采用X射线法对喷丸后板件中的残余应力进行了检测.超声喷丸成形试验和残余应力检测表明,板件喷丸后发生不同程度的变形,且板件中的残余压应力最大可达250 MPa,验证了纵弯复合换能器的有效性.A sandwich type piezoelectric ultrasonic peen forming transducer with longitudinal-flexural coupled mode was proposed to address the limited impact performance issues in confined space.With COMSOL simulation software,the vibration modes of the transducer were analyzed to obtain the harmonic frequencies at longitude and flexural vibrations.Meanwhile,the size of the transducer was determined to obtain large amplitudes under both modes.The Doppler laser vibrometer was employed to measure the working face of the transducer.The longitudinal and flexural vibration amplitudes were 1.0 and 0.8μm,respectively.After electrical matching,the amplitudes increased by 40%and 50%further.The amplitude of the impact pin can reach 1.2 mm under the two modes measured by the laser displacement sensor.Additionally,the ultrasonic peen forming test was applied on 2024-T351 aluminum alloy plates,and the residual stresses in the plates were detected by the X-ray method.The forming test and residual stress test show that different levels of deformation can be observed after ultrasonic peening,and the maximum compressive residual stress reaches 250 MPa,which verifies the effectiveness of the proposed longitudinal flexural coupled transducer.

关 键 词：超声喷丸成形 压电换能器 纵弯复合 模态分析 成形试验 

分 类 号：TB552[理学—物理]