聚偏氟乙烯叉指的多波段瑞利波水下传播特性  

Underwater propagation characteristics of multiband Rayleigh waves induced by polyvinylidene fluoride interdigitated transducers

作　　者：丁忠军 冯志亮 孟德健 李洪宇[1] 张奕 李德威 DING Zhongjun;FENG Zhiiang;MENG Dejian;LI Hongyu;ZHANG Yi;LI Dewei(College of Ocean Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China;National Deep Sea Base Management Center,Qingdao 266237,China;College of Shipbuilding Engineering,Harbin Engineering University,Harbin 150006,China)

机构地区：[1]山东科技大学海洋科学与工程学院,山东青岛266590 [2]国家深海基地管理中心,山东青岛266237 [3]哈尔滨工程大学船舶工程学院,黑龙江哈尔滨150006

出　　处：《哈尔滨工程大学学报》2023年第9期1557-1562,共6页Journal of Harbin Engineering University

基　　金：国家重点研发计划重点专项项目(2017YFC0306600);山东省重点研发计划(2020JMRH0101);国家重点研发专项(2021YFC2802100).

摘　　要：针对深海装备存在结构损伤实时监测困难的问题,本文设计了柔性电路板制作的以聚偏氟乙烯(PVDF)为基底的叉指换能器,并展开叉指换能器的多波段瑞利波水下传播特性的研究。通过COMSOL软件研究叉指换能器在水下传播瑞利波的特性,同时分析叉指换能器激励瑞利波的强度与激励周期的关系。设计微伏级OP37放大电路对2 mm和4 mm波长的柔性PCB叉指换能器进行实验验证。实验与仿真结果表明:仿真与实验结果的最大误差为8.4%,水下环境会极大地限制叉指换能器激励瑞利波的距离,但传播距离会随着波长的增加而增加,且通过瑞利波和水声声波的速度差解决叉指换能器激励的水声干扰的问题。Monitoring the structural damage of deep-sea equipment in real time is difficult.An interdigital transducer(IDT)made of flexible PCB based on PVDF film is designed to study the underwater propagation characteristics of IDT-induced multiband Rayleigh waves and solve the above problem.This paper presents the characteristics of the underwater propagation of IDT-excited Rayleigh waves as analyzed by the software COMSOL and the relationship between the intensity of the IDT-excited Rayleigh waves and the excitation period.A microvolt-level OP37 amplification circuit is designed for the experimental verification of the flexible PCB IDT at 2 and 4 mm wavelengths.The experimental and simulation results show that the maximum error between the simulation and experimental results is 8.4%.Although the underwater environment greatly limits the distance of the IDT-excited Rayleigh waves,propagation distance increases with the increase in wavelength.The problem of underwater acoustic interference excited by IDT is solved on the basis of the velocity difference between the Rayleigh and underwater acoustic waves.

关 键 词：深海装备 瑞利波 无损探伤 叉指换能器(IDT) 柔性电路板 薄膜传感器 数值仿真 实时监测 

分 类 号：TH89[机械工程—仪器科学与技术] TN722.3[机械工程—精密仪器及机械]