传感技术学报2017，Vol.30Issue(9)：1335-1342,8.DOI:10.3969/j.issn.1004-1699.2017.09.006
融合电磁超声载波的声发射传播特性分析
Propagation Characteristics Analysis of Acoustic Emission Integrating Electromagnetic Ultrasonic Carrier
摘要
Abstract
Electromagnetic acoustic emission technology ( EMAE ) does nondestructive detection with the effect of contactless electromagnetic loading to generate a stress field stimulating stress waves from the defective conductive structure. The most significant problem faced by the metallic structural health monitoring method of EMAE is that EMAE signal is not suitable for long distance transmission,this problem was improved by integrating electromagnetic ultrasonic carrier method. Firstly,based on free electron theory,the mechanism of EMAE was studied at a micro-scopic level which based on the activation energy changed from the electrical current to mobile dislocations. Second-ly,the difference of stress wave propagation characteristics under various electromagnetic stimulating conditions was researched by building finite element model. Finally,the comparison between the energy percentage intrinsic mode functions of carrier experiment was discussed by Hilbert-Huang transformation. The stress wave propagation charac-teristics of EMAE was improved by integrating electromagnetic ultrasonic method which based on the study and im-provement of traditional exciting,and the range of EMAE application will be widened.关键词
电磁声发射/电磁超声/融合/载波/传播特性Key words
electromagnetically induced acoustic emission/electromagnetic acoustic/integration/carrier/propagation characteristic分类
通用工业技术引用本文复制引用
蔡智超,张闯..融合电磁超声载波的声发射传播特性分析[J].传感技术学报,2017,30(9):1335-1342,8.基金项目
国家自然科学基金青年项目( 51307043) （ 51307043）
江西省青年科学基金项目( 20171BAB216035) （ 20171BAB216035）
