四川轻化工大学学报（自然科学版）2024，Vol.37Issue(1)：27-34,8.DOI:10.11863/j.suse.2024.01.04
用于厚壁结构中激励低频SH导波的换能器
A Transducer for Exciting Low-frequency SH Guided Wave in Thick-walled Structure
摘要
Abstract
The fundamental shear horizontal(SH0)wave is of practical importance in the structural health monitoring of thick-walled shell structures due to its unique non-dispersive characteristics.However,few transducers are available for exciting low-frequency pure SH0 wave in thick-walled shell structures.In this work,a low-frequency SH0 wave piezoelectric transducer is proposed,which is composed of two anti-symmetrically arranged thickness-shear piezoelectric wafers and a substrate with micro-structures.Both finite element simulations and experimental tests are conducted to examine the performance of the proposed transducer.Results show that the designed piezoelectric transducer can excite a high signal-to-noise ratio(SNR)SH0 wave in the frequency range of 45～65 kHz and focus the wave energy along two opposite directions.In addition,the microstructure design in the substrate can improve the SNR of the SH0 wave excited by the transducer.Experimental results show that the SNR of the SH0 wave excited by the transducer with microstructure is 277%higher than that of the transducer without microstructure.The proposed piezoelectric transducer provides a feasible approach for exciting low-frequency pure SH0 wave in thick-walled shell structures.关键词
导波/水平剪切波/压电换能器/结构健康监测/厚壁结构Key words
guided waves/shear horizontal wave/piezoelectric transducers/structural health monitoring/thick-walled structures分类
建筑与水利引用本文复制引用
张尧,阚前华,苗鸿臣..用于厚壁结构中激励低频SH导波的换能器[J].四川轻化工大学学报（自然科学版）,2024,37(1):27-34,8.基金项目
国家自然科学基金项目(12172310) （12172310）
四川省应用基础研究面上项目(2022NSFSC0435) （2022NSFSC0435）
中国科协青年人才托举工程项目(YESS20210342) （YESS20210342）
