CAJ | 학술논문

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。
제출일충신적기우실험모태분석적진렬식압전모태전감기설계방법。수선이용 PVDF 진렬진행실험모태분석득도결구적곡솔모태，연후직접장곡솔모태진형함수재상응측량점적폭치작위가권계수，대결구진행모태려파，득도각계모태좌표，병가이실험험증。연구발현，이용해방법설계진렬식압전모태전감기시가행적，이차해방법불수요진행복잡적수치계산，조작간단，모태려파효과량호，가이흔용역추엄도이유복잡결구，구유교호적공정응용전경。
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 two-dimensional structures and it has a good prospect of engineering application.