Development of an Omni-Directional Shear Horizontal Wave Transducer Based on a Radially Poled Piezoelec trie Ring

查看全文 作　　者：Qiang [1,2]Huan;Mingtong [1]Chen;Ai-Kah [3]Soh;Faxin [1,2]Li 机构地区：[1]LTCS and Department of Mechanics and Engineering Science,College of Engineering,Peking University,Beijing 100871,China;[2]Center for Applied Physics and Technology,Peking University,Beijing 100871,China;[3]School of Engineering,Monash University Malaysia,47500 Bandar Sunway,Malaysia 出　　处：《Acta Mechanica Solida Sinica》索引2019年第32卷第1期,共11页 基　　金：the National Natural Science Foundation of China under Grant No.11672003. 摘　　要：For the inspection of large plate-like structures,the omni-directional guided wave transducer-based system has been regarded as an effective tool since only a few transducers are required to cover the entire inspection area without blind zones.In comparison with Lamb waves,the shear horizontal(SH)wave is more promising because its fundamental mode is non-dispersive.In this work,we proposed an omni-directional SH wave piezoelec trie t ransducer(OSH-PT)based on a radially poled d24-mode PZT ring.Eoth the finite element simulations and experiments were carried out to demonstrate its performance in generating and receiving SH°wave.Results showed that the radially poled OSH-PT could generate single-mode SHo wave and receive SHo wave only over a wide frequency range from 70 to 200 kHz.The obtained signal-to-noise ratio can reach up to 26 dB in generation and 24 dB in reception.The omni-directivity of this OSH-PT is also very good with the deviation only about 6%in both generation and reception of SHo wave.Considering its easy fabrication,low cost and superior performances,this proposed OSH-PT may promote the applications of SHo wave-based inspection in structural health monitoring and nondestructive testing. 关 键 词：OMNI-DIRECTIONAL Guided WAVE SHEAR HORIZONTAL WAVE Piezoelec TRIE t ransducer