复杂航空结构中损伤的空间-波数域滤波成像

项目名称： 复杂航空结构中损伤的空间-波数域滤波成像

项目编号： No.51205189

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 机械工程学科

项目作者： 邱雷

作者单位： 南京航空航天大学

项目金额： 26万元

中文摘要： 针对真实复杂航空复合材料结构中，Lamb波各向异性明显和信号混叠严重，导致损伤难以准确监测这一难点问题，本项目提出研究一种损伤的空间-波数域滤波成像方法。利用空间滤波器定向扫描及波速无关的特点，通过研究多种压电传感器阵列构型的空间滤波器理论建模、抑制多模式信号混叠的Lamb波空间-波数域信号处理方法、复杂多反射信号混叠的抑制方法及损伤的波速无关的图像表征方法、结构损伤的空间-波数域滤波成像系统的软硬件实现方法以及信号易混叠复材结构中的空间-波数域滤波成像方法的验证，建立复杂航空复合材料结构中信号混叠的三级抑制机制，解决信号混叠造成损伤不易监测的难点问题，提出复杂航空复合材料结构中损伤的波速无关的图像表征方法，解决信号各向异性造成损伤监测准确性低的问题。本项目的研究对于将结构健康监测与管理技术进一步应用于真实复杂航空复合材料结构，为我国重点飞机型号工程提供技术支撑具有重要意义。

中文关键词： 结构健康监测；复合材料结构；Lamb波；空间滤波器；波数

英文摘要： Lamb wave propagting in real aerospace complex composite structure is of highly anisotropy and signal superposition, which makes it difficult to monitor damage in structure accurately. Aiming to solve this problem, a spatial-wavenumber filtering based damage imaging method is put forward. Based on directional filtering and propagation velocity independent feature of the spatial filter, this project will study five contents of piezoelectric sensor array configurations based modeling method of spatial filter, spatial-wavenumber filtering based Lamb wave signal processing method of multi-mode signal superposition inhibiting, methods of complex reflecting signal superposition inhibiting and propagation velocity independent damage imaging, method of hardware and software realization of spatial filter based damage imaging system and validation of spatial filter based damage imaging method on complex composite structure to build a three degrees of signal superposition inhibiting mechanism to solve the difficult issue of damage non-monitoring introduced by signal superposition and to put forward the propagation velocity independent damage imaging method of complex composite structure to solve the problem of low damage monitoring accuracy introduced by anisotropy. This research is of great significance to promote the pra

英文关键词： Structural Health Monitoring；composite structure；Lamb wave；spatial filter；wavenumber