电磁加载对超声传播特性的影响  

Impacts of the Electromagnetic Loading on the Propagation of the Ultrasonic Wave

作　　者：张闯[1] 李福彪[1] 刘素贞[1] 蔡智超[1] 杨庆新[1,2] Zhang Chuang;Li Fubiao;Liu Suzhen;Cai Zhichao;Yang Qingxin(Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Hebei University of Technology Tianjin 300130 China;Tianjin Key Laboratory of Advanced Technology of Electrical Engineering and Energy Tianjin Polytechnic University Tianjin 300387 China)

机构地区：[1]河北工业大学电磁场与电器可靠性省部共建重点实验室,天津300130 [2]天津工业大学电工电能新技术天津市重点实验室,天津300387

出　　处：《电工技术学报》2017年第2期102-107,共6页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51207105;51307043);教育部高等学校博土点专项科研基金(2012131720002);河北省高校优秀青年基金(Y2012006)资助项目

摘　　要：近年来,非线性超声技术在检测结构微损伤方面的能力引起了国内外学者广泛的关注。如何提高闭合裂纹引起的非线性声学响应是非线性超声检测技术要解决的关键问题。本文提出利用电磁加载的方式激励闭合裂纹处于动态扩展状态,并实现对超声的调制过程,进而产生较为强烈的超声非线性效应。通过研究电磁加载过程对闭合裂纹的激励效果,分析不同电磁加载参数对超声传播过程的影响特性,给出超声回波信号与电磁加载之间的对应关系,为超声非线性检测技术的工程应用提供重要依据。In recent years,the detectability of the nonlinear ultrasonic technology on themicro-damage has caused extensive concern.The key problem of the nonlinear ultrasonic technologywas how to enhance the nonlinear acoustic response.For this purpose,this paper proposed a newmethod.The state of the metal closed-crack was changed by the eddy current loading.The ultrasonichad been modulated in the crack area which could produce the nonlinear ultrasonic phenomenon.Through analyzing the loading effects of the eddy current coil on the closed-crack and its dynamicbehaviors,the impacts of the electromagnetic(EM)loading parameters on the ultrasonic nonlinearresponse were discussed.The ultrasonic nonlinear phenomena with the eddy current loading wasstudied by the modulated ultrasonic echo,and the corresponding relationship between the echo signaland the EM loading is demonstrated.It could provide the theory basis for engineering application of thenonlinear ultrasonic testing method.

关 键 词：电磁加载 超声非线性 闭合裂纹 信号处理 

分 类 号：TM15[电气工程—电工理论与新技术]