通过PVDF阵列测量阶梯梁体积位移的实验  

Experimental Research on Measuring the Volume Displacement of Stepped Beams by Using PVDF Arrays

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：《噪声与振动控制》2015年第6期202-206,共5页Noise and Vibration Control

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);江西省教育厅科技项目(GJJ13524)

摘　　要：以阶梯梁为例,通过一组阵列式压电薄膜(Polyvinylidene fluoride,PVDF)测量阶梯梁的体积位移。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截断奇异值法(The truncated singular value decomposition,TSVD)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、附加质量小、与激励力位置无关等优点。With a clamped stepped beam as an example, the experiment method for measurement of the volume displacement using PVDF (Polyvinylidene fluoride) arrays was studied. The arrays of PVDF films with the same rectangular segments were uniformly attached to the surface of the stepped beam as sensors. The frequency response functions between the excitation force and the output signals of the PVDF arrays were measured. The output signals of the PVDF arrays were multiplied by appropriate weights which were designed by the combination of the pseudo-inverse method with the truncated singular value decomposition (TSVD) method to gain the volume displacement of the stepped beam. Experimental results show that using the PVDF array designed by this method can accurately measure the volume displacement. This method has the advantages that it does not need the structural modal information, the additional mass of the array is negligible and it is independent of the excitation locations.

关 键 词：振动与波 阶梯梁 PVDF TSVD法 伪逆方法 频率响应函数 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]