通过实验模态分析设计阵列式压电模态传感器  

Design of modal sensors using PVDF array based on experimental modal analysis approach

作　　者：朱峤[1] 毛崎波[1] 

机构地区：[1]南昌航空大学飞行器工程学院,江西南昌330063

出　　处：《振动与冲击》2015年第19期120-125,191,共7页Journal of Vibration and Shock

基　　金：国家自然基金项目(51265037;11464031);江西省高等学校科技落地项目(KJLD12075);教育部留学回国人员科研启动基金;江西省教育厅科技项目(GJJ13524);南昌航空大学研究生创新基金(YC2013-001)

摘　　要：提出一种新的基于实验模态分析的阵列式压电模态传感器设计方法。首先利用PVDF阵列进行实验模态分析得到结构的曲率模态,然后直接将曲率模态振型函数在相应测量点的幅值作为加权系数,对结构进行模态滤波,得到各阶模态坐标,并加以实验验证。研究发现,利用该方法设计阵列式压电模态传感器是可行的,而且该方法不需要进行复杂的数值计算,操作简单,模态滤波效果良好,可以很容易推广到二维复杂结构,具有较好的工程应用前景。By using experimental modal analysis approach,an experimental methodology for design of modal sensors using PVDF array was presented. Firstly,the curvature modal shapes（ the second spatial derivatives of modal shapes） of structures were directly obtained with experimental modal analysis using an array of rectangular PVDF patches regularly arranged on the surface of structures. Then, the amplitudes of the curvature modal shape functions at measurement points were taken as weights of PVDF array. The weighted combinations of the PVDF outputs were proportional to responses of target modes. Other modes were filtered out. Numerical simulation and experimental results showed that the proposed method is effective and easy to operate; furthermore,this method can be extended to twodimensional structures and it has a good prospect of engineering application.

关 键 词：模态传感器 PVDF薄膜 实验模态分析 模态滤波 曲率模态 

分 类 号：TP212.6[自动化与计算机技术—检测技术与自动化装置]