摘要
针对传统损伤识别方法精度不高,且大多仅限于对结构表面单个裂纹的识别的问题,提出了一种基于PVDF压电薄膜传感器和归一化应变模态差梁型结构表面裂纹检测新方法。为验证所提出的方法,以铝合金悬臂梁为例,利用PVDF压电传感器阵列,采用单点激励,多点响应的方法测量结构件表面应变模态,利用损伤前后归一化二阶应变模态差和三阶应变模态差来实现悬臂梁结构单裂纹与双裂纹识别。实验结果表明,利用PVDF传感器和归一化应变模态差可以实现对梁型结构单裂纹和双裂纹的损伤识别,且识别效果较好。
In order to overcome weakness of the accuracy was not high and studied the single crack of the traditional damage identification method.A new crack defection approach based on PVDF sensors and the difference of normalized strain mode for crack defection in beam structure was presented.In order to verified the proposed method,a single crack aluminum alloy cantilever beam identification experiment and two crack aluminum alloy cantilever beam identification experiment were carried out using PVDF sensors array,the surface strain mode of the structure was measured using single point excitation and multi-point response method,the single crack and double crack in cantilever beam were identified using the difference of the sencond strain mode and the third strain mode before and after damage.The experiment results show that it can be used for the single crack and double crack identification using PVDF sensors and the difference of normalized strain mode,which has higher recognition accuracy.
作者
李灵杰
韩晶
李栋
Li Lingjie;Han Jing;Li Dong(School of Mechanical Engineering,North University of China,Taiyuan 030051,China)
出处
《国外电子测量技术》
2018年第6期71-74,共4页
Foreign Electronic Measurement Technology
基金
中北大学研究生科技立项基金(20171406)资助项目
