恒速直线连续面扫描激光多普勒测振方法

发布时间：2018-03-05 23:19

本文选题：激光多普勒测振　切入点：恒速扫描　出处：《南京航空航天大学学报》2017年04期 　论文类型：期刊论文

【摘要】：介绍了一种恒速直线面扫描方式下的连续扫描激光多普勒测振(Continuous scanning laser Doppler vibrometry,CSLDV)方法。该方法在扫描多普勒测振系统的基础上,通过控制激光头两个相互垂直的扫描镜连续恒速运动实现激光点在被测平面连续扫描测试。本文阐述了恒速直线面扫描连续激光多普勒测振的基本理论,以及测试信号处理过程中的延迟去除和振型解调中的滤波器选择、坐标变换等内容,并以平板结构为例完成了连续激光多普勒测振实验及数据分析方法的验证,采用最小化虚部振型的方法解调了测试工作变形。结果表明,由恒速直线面扫描测试获得的工作变形与相应模态振型十分接近,可以作为空间分辨率很高的振型测试数据。连续扫描激光多普勒测振技术是一种高分辨率振型测试的高效方法,具有十分重要的应用价值。
[Abstract]:In this paper, a continuous scanning laser Doppler vibrometric CSLDV (continuous scanning laser Doppler vibrometric) method for continuous laser Doppler vibration measurement under the constant speed linear plane scanning mode is introduced, which is based on the scanning Doppler vibration measurement system. The continuous scanning measurement of laser points in the measured plane is realized by controlling the continuous velocity motion of two vertical scanning mirrors of the laser head. The basic theory of continuous laser Doppler vibration measurement with constant velocity linear scanning surface is described in this paper. The filter selection and coordinate transformation in signal processing and mode demodulation are also discussed. The experiment of continuous laser Doppler vibration measurement and the verification of data analysis method are carried out by taking the flat plate structure as an example. The method of minimizing virtual mode shape is used to demodulate the working deformation of the test. The results show that the working deformation obtained from the constant speed linear plane scanning method is very close to the corresponding modal mode shape. Continuous scanning laser Doppler vibration measurement technology is an efficient method for high resolution mode measurement and has very important application value.
【作者单位】：南京航空航天大学能源与动力学院;北京强度环境研究所可靠性与环境工程技术重点实验室;
【基金】：国家自然科学基金(51175244,11372128)资助项目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
【分类号】：TB523;TN249

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