南京航空航天大学学报2017，Vol.49Issue(4)：511-517,7.DOI:10.16356/j.1005-2615.2017.04.009
恒速直线连续面扫描激光多普勒测振方法
Laser Doppler Vibrometry Method with Uniform Rate Raster Continuous Scanning
摘要
Abstract
This paper presents a method of measuring area sinusoidal vibration mode shapes using uniform-rate raster scan with continuous scanning laser Doppler vibrometry (CSLDV).In the method,laser point scans continuously on the tested surface at uniform rate by controlling beam-deflection mirrors in LDV.Firstly,basic theories of uniform-rate raster scan with CSLDV are introduced and methods of delay removal,filter choosing,coordinate transformation in operating deflection shape (ODS) demodulation are studied.Then,the process is used on a steel rectangular plate under single frequency sinusoidal excitation and ODS is demodulated.Finally,modal tesing is conducted using scanning LDV and the modal assurance criterion (MAC) between tested ODS and tested mode shapes are calculated.The result shows that ODS obtained by the proposed method is very close to the mode shapes and can be used as mode shapes with high spatial resolution.CSLDV is a time efficient method to obtain mode shapes with high spatial resolution and has important application value.关键词
激光多普勒测振/恒速扫描/连续面扫描/工作变形Key words
laser Doppler vibration test/uniform rate scan/continuous raster scanning/operating deflection shape (ODS)分类
通用工业技术引用本文复制引用
宋安平,臧朝平,张忠..恒速直线连续面扫描激光多普勒测振方法[J].南京航空航天大学学报,2017,49(4):511-517,7.基金项目
国家自然科学基金(51175244,11372128)资助项目 （51175244,11372128）
航天一院高校联合创新基金资助项目 （）
南京航空航天大学研究生创新基地(实验室)开放基金(kfjj20150201)资助项目. （实验室）
