【作者】 陈中剑；

【导师】 杨庆新；

【作者基本信息】 河北工业大学 ， 电工理论与新技术， 2006， 硕士

【摘要】 电磁声发射技术是近几年发展起来的一种无损检测新技术,可以用来对导电薄板进行损伤评价。该技术通过对被测物品的局部施加一个电磁场,使其产生声发射响应,从而对缺陷位置进行评价。电磁声发射技术是一个新技术,对其产生机理以及应用的理论分析是非常有必要的。由于电磁声发射技术中的非线性问题以及电磁-应力等多场耦合问题十分复杂,采用传统的解析方法,难以分析研究电磁声发射技术的机理。本文建立了电磁声发射的数学模型,并用有限元法进行计算,说明了其产生机理。并引入超声调制,论证了电磁声发射用于无损检测是可行的。最后,本文还对电磁声发射实验进行了设计。更多还原

【Abstract】 Electromagnetically induced acoustic emission technique (EM AE) is a recently developed non-destructive test technique (NDT), which can be used for damage assessment of thin walled conducting structures. This technique allows a structure to be loaded locally by applying an electromagnetic field in order to produce an AE response, which may be captured by conventional AE sensors. As a new technique, much work is needed to theoretically study its principle and application. Because there are many nonlinear problems in EM AE, and the electromagnetic-structure coupling field problem is very complicated, traditional analytic method cannot get a comprehensive solution to these problems. In this paper, finite element analysis of EM AE is presented. In additional, we introduce the electromagnetic modulation into EM AE, so as to improve the reality feasibility of EM AE. Finally we do the predesign of the EM AE experimental system.更多还原