通过PVDF阵列设计阶梯梁的模态传感器  

Design of modal sensors for a stepped beam based on PVDF array

作　　者：钟海彬[1] 毛崎波[1] 

机构地区：[1]南昌航空大学飞行器工程学院,南昌330063

出　　处：《振动与冲击》2016年第9期129-134,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51265037;11464031);江西省高等学校科技落地项目(KJLD12075)

摘　　要：以两端固支阶梯梁为例,通过高分子压电薄膜(Poly Vinyli Dene Fluoride,PVDF)传感器阵列测量其模态坐标。在该阶梯梁表面均匀黏贴一组相同形状的矩形PVDF薄膜,首先通过实验方法直接测得该阶梯梁的曲率模态,然后把曲率模态作为这组PVDF输出信号的加权因数,从而得到所需的模态坐标。实验结果表明,这种传感器设计方法是可行的,并且PVDF阵列式模态传感器具有在不均匀梁结构表面布置方便,能准确、方便的测出实验曲率模态,不受激励力位置影响,滤波效果好等优点。With an example of a clamped-clamped beam containing multiple steps,a new test approach was presented to design modal sensors by using an array of polyvinylidene fluoride （PVDF）sensors.An array of rectangular segments of PVDF film uniformly was stuck on the surface of the beam,was taken as sensors.Firstly,an experimental modal analysis method was applied to obtain the beam＇s curvature modal shapes directly.Then the measured curvature modal shapes were taken as the corresponding weighted coefficients of the output signals of the PVDF films,the weighted combinations of the outputs directly lead to the target modal coordinates.The experimental results showed that PVDF array modal sensors have advantages of easily bonded on the surface of the stepped beam,accurately and conveniently measuring tested curvature modes,independence of positions of external excitations,and good effect of modal filtering,etc.

关 键 词：PVDF传感器 实验模态分析 曲率模态 模态滤波 阶梯梁 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]