基于PZT/Terfenol-D双层复合结构的导波换能器研究  

Study on Guided Wave Transducer Based on PZT/Terfenol-D Double-Layer Composite Structure

作　　者：王晓煜[1] 张树森 宋佳璟 WANG Xiaoyu;ZHANG Shusen;SONG Jiajing(School of Mechanical Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学机械工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2024年第4期64-70,共7页Journal of Dalian Jiaotong University

摘　　要：为了解决传统磁致伸缩换能器激励信号能量弱、检测效率低的问题,提出一种基于PZT/Terfenol-D双层复合结构的导波换能器以提高换能效率。首先,建立换能器的谐振磁电动力学模型,设计换能器结构;其次,对设计的换能器进行仿真,验证换能器模型的合理性及可行性,并对其进行结构优化;最后,制作样机进行试验,采集换能器的激励信号能量,与传统磁致伸缩换能器和PZT换能器进行对比,并对获取的各组超声导波信号进行滤波处理,计算各自信号的幅值平方和。试验结果表明:所设计的换能器激励信号幅值平方和为PZT换能器的1.49倍,大于传统磁致伸缩换能器与PZT换能器激励信号幅值平方的总和。Ultrasonic guided wave nondestructive testing based on magnetostrictive transducer is widely used in structural health testing due to its advantages of high efficiency,no coupling and wide application range.But the signal energy of traditional magnetostrictive transducer is weak and the detection efficiency is low.There⁃fore,a guided wave transducer is proposed based on PZT/Terfenol-D double-layer composite structure to im⁃prove energy exchange efficiency.Firstly,the resonant magnetoelectrodynamics model of the transducer is es⁃tablished,and the structure of the transducer is designed.Then the transducer is simulated to verify the ration⁃ality and feasibility of the transducer model,and its structure is optimized.Finally,a prototype was made to collect the energy of the transducer excitation signal.Compared with the traditional magnetostrictive transducer and PZT transducer,the obtained ultrasonic guided wave signals of each group were processed by filtering,and the amplitude sum of squares of the respective signals were calculated.The experiment results show that the sum of the amplitudes squared of the designed transducer is 1.49 times that of the PZT transducer,which is larger than the sum of the amplitudes squared of the traditional magnetostrictive transducer and the PZT transducer.

关 键 词：磁致伸缩贴片换能器 超声导波 超磁致伸缩材料 磁电复合材料 

分 类 号：TB552[理学—物理]