电工技术学报2018，Vol.33Issue(1)：140-147,8.DOI:10.19595/j.cnki.1000-6753.tces.160927
基于电磁超声双换能器的单模态Lamb波激励方法研究
Research on Excitation Method of Single-Mode Lamb Wave Based on Electromagnetic Acoustic Double Transducer
摘要
Abstract
Lamb waves are widely used in nondestructive testing (NDT) and structural health monitoring (SHM) for its obvious advantages, such as good directionality, longer-range propagation and lower loss etc. However, it is difficult to analysis and interpret the echo signals because of the multi-modes and dispersion of the Lamb waves. In this paper, the properties of single-mode Lamb waves which were excited by electromagnetic acoustic double transducer were studied based on the principles of multi-modes and the characteristics of wave structure. Meanwhile, the correctness of the double transducer excitation structure has been verified by experiments. Simulations and experimental results show that the double transducer excitation structure can stimulate single-mode Lamb waves and eliminate the extra modes which produced by modal conversion at ends of the specimen. The single-mode excitation of Lamb waves is beneficial to reduce the difficulty of signal processing and provide reliable information for locating the defects. The researches in this paper can be used as a theoretical basis to design double transducer excitation system.关键词
Lamb波/多模态/电磁超声双换能器/单模态Key words
Lamb wave/multi-modes/electromagnetic acoustic double transducer/single-mode分类
通用工业技术引用本文复制引用
刘素贞,张严伟,张闯,金亮,杨庆新..基于电磁超声双换能器的单模态Lamb波激励方法研究[J].电工技术学报,2018,33(1):140-147,8.基金项目
国家自然科学基金(51777052)、河北省自然科学基金(E2016202260,E2017202055)和天津市自然科学基金(16JCYBJC19000)资助项目. （51777052）
