超声喷丸换能器的高电压阻抗匹配设计  

Matching Design for Electrical Impedance of Ultrasonic Peen Forming Transducers Operated at High Voltages

作　　者：施陆锴 芦小龙[1] 李武琴 钱丰 曹达 李华峰[1] SHI Lukai;LU Xiaolong;LI Wuqin;QIAN Feng;CAO Da;LI Huafeng(State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics Nanjing,210016,China)

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016

出　　处：《振动．测试与诊断》2023年第5期880-885,1035,共7页Journal of Vibration,Measurement & Diagnosis

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)。

摘　　要：研究了超声喷丸换能器在不同电压下的阻抗特性,设计了针对高电压驱动工况的阻抗匹配方法。首先,采用功率放大器和示波器获取高电压下换能器两端的电压、电流以及相位差,计算得到阻抗特性曲线;其次,以工作频率下的阻抗为基准,计算并联匹配和串联匹配时的电感值,通过对比优选负载电路呈纯阻性的匹配方式,实现有功功率的最大化;最后,将匹配电路结合自制的驱动电源设计了超声喷丸成形驱动系统,利用激光位移传感器对比了匹配前后喷丸枪撞针振幅的变化。结果表明,当以2.6 mH电感串联匹配时测得接入匹配电路后喷丸撞针冲击振幅由2.7 mm升至4.9 mm,验证了所提匹配方法的有效性。On the basis of the impedance variation under different voltages,an electrical matching design is presented to improve the performance of ultrasonic peen forming(UPF)transducers operated at high-voltage conditions.Firstly,the voltage,current and temporal phase difference are measured for UPF transducers under high driving voltages,and then the actual impedance characteristic curve is obtained.Secondly,inductor values for both parallel and serial matching circuit are calculated and testified at resonance frequency for the UPF transducer.Then,the inductance value is accurately tuned to achieve the ideal pure resistant characteristic with the largest active power.Finally,the matching design is coupled with self-made driving board to supply electrical powers for UPF transducer,and the peening performances before and after matching are compared by measuring the movement of impact pins.Experimental results reveal that the maximum displacement for impact pins increases from 2.7 mm to 4.9 mm after incorporating the serial matching circuit with 2.6 mH inductor,demonstrating the feasibility and effectiveness of the proposed matching method.

关 键 词：超声喷丸换能器 谐振频率 阻抗特性 匹配电路 

分 类 号：TH39[机械工程—机械制造及自动化] TH69