压电智能梁的机电阻抗分析和损伤识别
毕业论文关键词：智能材料、压电阻抗法、结构健康监测、RMSD、有限元法、数值模拟
IMPEDANCE ANALYSIS AND DAMAGE IDENTIFICATION OF PIEZOELECTRIC SMART BEAMS Abstract With the acceleration of the process of social modernization, human’s work and life increasingly rely on large engineering structures. As time goes by, health status of various structures gradually become the issues of people’s concern. Therefore, for the factors of security and economic, it’s essential to develop the techniques of Non Destructive Testing. With the development of modern NDT techniques, there is a NDT technique based on the measurement of piezoelectric impedance described in this thesis in addition to those NDT techniques based on sound, light, electricity, magnetism etc. As intelligent materials now commonly used, lead zirconate-titanate (PZT) is an important part of Structural Health Monitor elements because of its advantages such as compact size, good durability, high sensitivity etc. An Electro-Mechanical Impedance (EMI) Method based on PZT is adopted in the detection of defects existed in the thesis. Firstly, current situation of PZT impedance method is introduced, and the merits and shortcomings of the method are pointed out in the thesis. And there is a comparison of the conventional NDT methods and PZT impedance method. Secondly, piezoelectric ceramics and mechanism of its structure are introduced, the basic principle of application of the PZT impedance method is discussed in this thesis. The impedance of PZT attached to beam’s surface is measured by an impedance analyzer. By comparing different conditions of impedance spectrum, the preliminary analysis is made for the results. Then count the data measured before, obtaining RMSD as a damage criterion，which demonstrates the effectiveness and feasibility of PZT impedance method. Finally, numerical simulation is performed by ANSYS using Finite Element Method(FEM)，which also demonstrates the effectiveness and feasibility of PZT impedance method.
Key words : intelligent materials, PZT impedance method, Structural Health Monitoring, RMSD, Finite Element Method(FEM), numerical simulation
目 录
1 绪论 .. 1
1.1项目研究的背景和意义 . 1
上一篇：压电陶瓷性能参数测试的实验研究