摘要
针对钢轨损伤检测系统中压电超声换能器与激励源存在阻抗失配,以及压电超声换能器带载后谐振频率偏移等问题,本文对压电超声换能器宽频阻抗匹配进行研究。首先,对压电超声换能器BVD模型参数进行优化。其次,基于上述模型,设计4种匹配网络,对其性能进行比较分析,从而确定最佳网络拓扑结构和参数。最后,基于一发一收实验平台,测试对比匹配前后压电超声换能器的接收信号。测试结果表明,本文设计的阻抗匹配网络可以实现对压电超声换能器的高效匹配,匹配后发射换能器有功功率平均提升了197.38%,工作带宽从1.44 kHz提升至2.22 kHz。同未匹配和传统L型匹配网络相比,本文设计的宽频阻抗匹配网络使得发射强度分别提升了61.07%和18.05%,压电超声换能器在工作带宽内均可达到良好的发射状态。
Aiming at the impedance mismatch between the piezoelectric ultrasonic transducer and the excitation source in the rail damage detection system,as well as the resonant frequency shift of the piezoelectric ultrasonic transducer after loading,this paper studies the broadband impedance matching of the piezoelectric ultrasonic transducer.Firstly,the parameters of the piezoelectric ultrasonic transducer BVD model are optimized.Secondly,four matching networks are designed based on the above models,and their performances are compared and analyzed to determine the optimal network topology and parameters.Finally,based on experimental platform of pitch-catch,the received signals of piezoelectric ultrasonic transducers before and after matching are tested and compared.The test results show that the impedance matching network designed in this paper can achieve efficient matching of piezoelectric ultrasonic transducers,and the active power of the transmitter transducer is increased by an average of 197.38%after matching,and the operating bandwidth is increased from 1.44 kHz to 2.22 kHz.Compared with the unmatched and traditional L-shaped matching network,the broadband impedance matching network designed in this paper increases the emission intensity by 61.07%and 18.05%respectively,and the piezoelectric ultrasonic transducer can achieve a good working condition within the working bandwidth.
作者
王刚
魏小源
黄玲
许子健
梅潭
Wang Gang;Wei Xiaoyuan;Huang Ling;Xu Zijian;Mei Tan(College of Electrical and Information Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Gansu Advanced Control for Industrial Processes,Lanzhou 730050,China;National Demonstration Center for Experimental Electrical and Control Engineering Education,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《电子测量技术》
北大核心
2023年第1期57-64,共8页
Electronic Measurement Technology
基金
国家自然科学基金(62101228)
甘肃省青年科技基金(21JR7RA245)
甘肃省科技重点研发项目(20YF3GA018)
甘肃省工业过程先进控制重点实验室开放基金(2022KX05)
甘肃省高等学校青年博士基金(2022QB-053)项目资助
关键词
钢轨检测
压电超声换能器
阻抗匹配
最优参数
工作带宽
rail detection
piezoelectric ultrasonic transducer
impedance matching
optimal parameters
operating bandwidth
