摘要
为了实现含任意圆形缺孔的平板结构的振动变形测量,提出了一种子区域划分测试与振型重构的激光连续扫描多普勒测试方法。首先,将任意圆形缺孔的平板结构表面通过子区域划分,得到完全覆盖的多个矩形和圆环形扫描的子区域,并分别使用恒速直线连续扫描和螺旋线扫描的方法,得到各子区域的振动变形;其次,考虑子区域分别扫描中存在的振幅比例、基准平面和旋转角度不同以及节径两侧反向振动等问题,拼接和重构所有子区域的振动变形,得到整体结构的振动变形;最后,将振型结果与仿真结果进行对比,模态置信因子(modal assurance criterion,简称MAC)均大于0.95,验证了方法的有效性。该方法可实现含有任意圆形缺孔的平板结构的连续扫描激光振动测试,具有效率高、测点密集等优点,对进一步提高其工程应用的适用范围具有重要作用。
A method of laser continuous scanning Doppler testing based on sub region division and mode recon-struction is proposed to measure the operational deformation shape of flat plate structure with arbitrary circular holes.Firstly,the surface of a flat plate structure with arbitrary circular holes is divided into several sub regions,which are completely covered by rectangular and circular scanning.The operational deformation shape of each sub region is obtained by using constant speed linear continuous scanning and spiral scanning methods respective-ly.Then,considering the problems of amplitude ratio,different reference plane and rotation angle,and reverse vibration on both sides of the pitch diameter,the operational deformation shape of all sub regions is spliced and reconstructed to obtain the operational deformation shape of the whole structure.Finally,compared with the simulation results,measured modal assurance criterion(MAC)values are greater than 0.95,verifying the effec-tiveness of the method.This method can realize the continuous scanning laser vibration test of flat plate structure with arbitrary circular holes,and thus has the advantages of high efficiency and dense measuring points.It plays an important role in further improving the application scope of its engineering applications.
作者
张磊
臧朝平
陈香
王琦
ZHANG Lei;ZANG Chaoping;CHEN Xiang;WANG Qi(College of Energy and Power Engineering,Nanjing University of Aeronautics&Astronautics Nanjing,210016,China;Sichuan Gas Turbine Research Institute of AVIC Chengdu,610000,China)
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2023年第3期493-499,619,共8页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(12072146)
中国航发四川燃气涡轮研究外委课题(基础支撑)资助项目。
关键词
圆形缺孔
连续扫描
激光多普勒
子区域划分
振型重构
circular hole
continuous scanning
laser Doppler
sub region division
mode reconstruction
