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Applications of continuous tracking SLDV measurement methods to axially symmetric rotating structures using different excitation methods

机译：连续跟踪SLDV测量方法在采用不同激励方法的轴对称旋转结构中的应用

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This paper presents the latest developments of the continuous-scanning laser Doppler vibrometry (C-SLDV) measurement methods applied to rotating axially symmetric structures such as bladed discs. Measurement of vibrations of rotating structures are still difficult to perform. The main reason is due to the limitations of conventional transducers used for capturing the vibrations, these are often unable to measure and/or transfer a good quality signal remotely. The LDV became an ideal candidate to replace/ aid such transducers, but only the introduction of two scanning mirrors in front of a laser head produced a step forward in measurements of vibrations of rotating targets; SLDV systems are now widely used both in industry and academic communities.rnThis work shows how a commercial SLDV system can be used for measurement of vibrations of bladed discs under rotating conditions. The features of the scanning head, which was not modified for this study, were exploited up to the limit to achieve the synchronization between the scanner and a rotating target. The simplest tracking technique is performed when a circle-line scan pattern is synchronized with the rotating bladed disc so as to produce the point tracking measurement method. The extension of such a discrete measurement method to a full-field one is made when the laser beam is capable of tracing continuously either a line (LineScan tracking) or an area (AreaScan tracking) over the surface of the rotating structure. The development of tracking C-SLDV measurement techniques is achieved by the use of the traditional excitation methods and the development of a new excitation system, which will bring the excitation and the measurement to be in the same rotating frame of reference. Several experimental results are provided to illustrate the use of such techniques in turbomachinery industries.
机译：本文介绍了连续扫描激光多普勒振动法（C-SLDV）测量方法的最新进展，该方法适用于旋转的轴对称结构（如叶片盘）。旋转结构的振动的测量仍然难以执行。主要原因是由于用于捕获振动的常规换能器的局限性，这些换能器通常无法远程测量和/或传输高质量信号。 LDV成为替换/辅助此类换能器的理想选择，但是只有在激光头前面引入两个扫描镜才使旋转目标的振动测量向前迈进了一步。 SLDV系统现已在工业和学术界广泛使用。这项工作说明了如何将商业SLDV系统用于测量旋转条件下叶片盘的振动。扫描头的功能（在本研究中未进行任何修改）已被最大限度地利用，以实现扫描仪和旋转目标之间的同步。当圆线扫描图案与旋转刀片盘同步时执行最简单的跟踪技术，以产生点跟踪测量方法。当激光束能够连续跟踪旋转结构表面上的直线（LineScan跟踪）或区域（AreaScan跟踪）时，可以将这种离散测量方法扩展到全场。跟踪C-SLDV测量技术的发展是通过使用传统的激励方法和开发新的激励系统来实现的，这将使激励和测量处于同一旋转参考框架中。提供了一些实验结果来说明这种技术在涡轮机械工业中的使用。

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