通过PVDF阵列设计阶梯梁体积位移传感器  

Design of Volume Displacement Sensor for Stepped Beam by PVDF Array

作　　者：钟海彬[1] 毛崎波[1] 翁丰壕[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：《仪表技术与传感器》2016年第5期1-5,14,共6页Instrument Technique and Sensor

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：以阶梯梁为例,通过一组阵列式压电薄膜(Polyvinylidene fluoride,PVDF)设计非均匀振动梁的体积位移传感器。在梁表面均匀布置一组相同形状的矩形PVDF阵列,通过测量PVDF与激励力之间的频率响应函数,然后利用伪逆方法结合Tikhonov正则化方法设计这组PVDF阵列的加权系数,从而得到阶梯梁体积位移。实验结果表明,该方法能够准确测量到阶梯梁的体积位移,具有不需计算结构模态、对边界条件有良好的鲁棒性等优点。With an example of clamped stepped beam,the volume displacement sensor for non-uniform beam was designed by PVDF array. An array of rectangular segment of PVDF film with the same shape equally attached on the surface of the beam were taken as sensors. The frequency response functions between the excitation force and the PVDF film were measured. The output signals of PVDF array were multiplied by appropriate weights designed by the pseudo-inverse method combined with Tikhonov regularization method to gain the volume displacement of the experimental beam. Experimental results show that the volume displacement sensor designed by the proposed method can accurately sense volume displacement. The advantages of the proposed method are that it does not need the structural mode information and has good properties of robustness of the boundary condition.

关 键 词：阶梯梁 PVDF压电薄膜 TIKHONOV正则化 伪逆方法 体积位移传感器 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]