三维连续扫描激光多普勒测振仪测量曲面结构的全场工作偏转形状

K. Yuan, Wei-dong Zhu
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摘要

本文提出了一种新型的通用三维连续扫描激光多普勒测振仪(CSLDV)系统,用于非接触、快速测量曲面结构的三维全场振动。所提出的三维CSLDV系统由三个CSLDV、一个剖面扫描仪和一个外部控制器组成,并通过测量正弦激励下具有曲面的涡轮叶片的三维全场振动并识别其工作挠度形状(ODSs)进行了实验验证。基于叶型扫描仪的扫描结果,提出了叶片曲面的三维锯齿形扫描路径,并根据光束之间的关系调整CSLDVs中6个反射镜的扫描角度,使三个激光光斑集中在一个位置,引导它们连续同步扫描所提出的三维扫描路径。采用一种称为解调方法的信号处理方法来识别叶片的三维ods。3D CSLDV测量的前6个ODSs与商用3D SLDV系统的测量结果吻合良好,模态保证准则值大于95%。实验中,三维SLDV系统扫描85个测点耗时约900秒,三维CSLDV系统扫描132000个测点耗时115.5秒,表明本文提出的三维CSLDV系统测量曲面结构三维全场振动的效率远高于三维SLDV系统。
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Full-Field Operating Deflection Shape Measurement of a Structure With a Curved Surface Using a Three-Dimensional Continuously Scanning Laser Doppler Vibrometer System
This study proposes a novel general-purpose 3D continuously scanning laser Doppler vibrometer (CSLDV) system to measure 3D full-field vibration of a structure with a curved surface in a non-contact and fast way. The proposed 3D CSLDV system consists of three CSLDVs, a profile scanner, and an external controller, and is experimentally validated by measuring 3D full-field vibration of a turbine blade with a curved surface under sinusoidal excitation and identifying its operating deflection shapes (ODSs). A 3D zig-zag scan path is proposed for scanning the curved surface of the blade based on results from the profile scanner, and 6scan angles of mirrors in CSLDVs are adjusted based on relations among their laser beams to focus three laser spots at one location, and direct them to continuously and synchronously scan the proposed 3D scan path. A signal processing method that is referred to as the demodulation method is used to identify 3D ODSs of the blade. The first six ODSs from 3D CSLDV measurement have good agreement with those from a commercial 3D SLDV system with modal assurance criterion values larger than 95%. In the experiment, it took the 3D SLDV system about 900 seconds to scan 85 measurement points, and the 3D CSLDV system 115.5 seconds to scan 132,000 points, indicating that the 3D CSLDV system proposed in this study is much more efficient than the 3D SLDV system for measuring 3D full-field vibration of a structure with a curved surface.
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