层叠导体脉冲涡流检测中探头瞬态响应的快速计算.pdf

第29 卷 第36 期 中 国 电 机 工 程 学 报 Vol.29 No.36 Dec.25, 2009 2009 年12 月25 日 Proceedings of the CSEE ©2009 Chin.Soc.for Elec.Eng. 129 0258-8013 (2009) 36-0129-06 TH 878 A 470 40 文章编号： 中图分类号： 文献标志码： 学科分类号： ⋅ 层叠导体脉冲涡流检测中探头瞬态响应的快速计算 张玉华，孙慧贤，罗飞路 ( 国防科学技术大学机电工程与自动化学院，湖南省 长沙市 410073) Fast Calculation of Probe’s Transient Response to Pulsed Eddy-current for Inspection of Multi-layered Conductive Structures ZHANG Yu-hua, SUN Hui-xian, LUO Fei-lu (Institute of Mechanical and Electrical Engineering, National University of Defense Technology, Changsha 410073, Hunan Province, China) ABSTRACT: To research metal thinning, interlayer gap 数；级数展开；傅里叶变换；时步法 variation caused by all kinds of hidden corrosion in aircraft 0 引言 multi-layered metal structure, the electromagnetic field theory model of n-layered conductive structure inspected by pulsed 在飞机机身多层金属板搭接处、翼面胶接复合 eddy current technique was built. The reflection coefficient of 结构中、机翼铝蒙皮上紧固件孔周围以及发动机固 the conductive structure to probe is derived by using magnetic 定支座和冷却组件中常会发生各类隐藏的腐蚀或 vector potential A . It is generalized as the product of n matrix. 应力裂纹，从而导致关键结构的损伤和断裂[1-2]，因 Furthermore, the frequency-domain response of two coaxial 此如何有效检出这类缺陷是飞机日常维护和检修 coils probe is derived and expressed in integral expression. According to the diffusion characteristic of low-frequency 中极为重要的课题。传统的单(多)频涡流检测技术 electromagnetic field and partial difference equation theory, 简单可行，对表面或近表面缺陷有着很高的灵敏 double generalized integral is ex