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首页> 外文期刊>Mechanical systems and signal processing >Rotating blade vibration analysis using photogrammetry and tracking laser Doppler vibrometry
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Rotating blade vibration analysis using photogrammetry and tracking laser Doppler vibrometry

机译：使用摄影测量法和跟踪激光多普勒振动法的旋转叶片振动分析

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摘要

Online structural dynamic analysis of turbomachinery blades is conventionally done using contact techniques such as strain gauges for the collection of data. To transfer the captured data from the sensor to the data logging system, installation of telemetry systems is required. This is usually complicated, time consuming and may introduce electrical noise into the data. In addition, contact techniques are intrusive by definition and can introduce significant local mass loading. This affects the integrity of the captured measurements. Advances in technology now allow for the use of optical non-contact methods to analyse the dynamics of rotating structures. These include photogrammetry and tracking laser Doppler vibrometry (TLDV). Various investigations to establish the integrity of photogrammetry measurements for rotating structures involved a comparison to data captured using accelerometers. Discrepancies that were noticed were attributed to the intrusive nature of the contact measurement technique. As an extended investigation, the presented work focuses on the validation of photogrammetry applied to online turbo-machinery blade measurements, using TLDV measurements. Through a frequency based characterisation approach of the dynamics of the two scanning mirrors inside the scanning head of a scanning laser Doppler vibrometer (SLDV), TLDV is employed in developing a system that can be used to achieve a perfect circular scan with a Polytec SLDV, (PSV 300). Photogrammetry out-of-plane displacements of a laser dot focused on a specific point on a rotating blade are compared to displacements captured by the laser scanning system. It is shown that there is good correlation between the two measurement techniques when applied to rotating structures, both in the time and frequency domains. The presence of slight discrepancies between the two techniques after elimination of accelerometer based errors illustrated that the optical system noise floor of photogrammetry does contribute to inconsistencies between photogrammetry and other measurement techniques.
机译：涡轮机械叶片的在线结构动力学分析通常使用接触技术（例如应变仪）进行收集数据。要将捕获的数据从传感器传输到数据记录系统，需要安装遥测系统。这通常很复杂，耗时，并且可能会将电噪声引入数据中。另外，接触技术从定义上讲是侵入性的，并且会引入很大的局部质量负荷。这会影响捕获的测量的完整性。现在，技术的进步允许使用光学非接触方法来分析旋转结构的动力学。这些措施包括摄影测量法和跟踪激光多普勒振动法（TLDV）。建立旋转结构摄影测量测量完整性的各种研究涉及与使用加速度计捕获的数据的比较。注意到的差异归因于接触测量技术的侵入性。作为扩展的研究，本文的工作重点在于使用TLDV测量对应用于在线涡轮机械叶片测量的摄影测量的验证。通过基于频率的表征方法来扫描激光多普勒振动计（SLDV）的扫描头内部的两个扫描镜的动力学特性，TLDV用于开发系统，该系统可用于通过Polytec SLDV实现完美的圆形扫描， （PSV 300）。将聚焦在旋转刀片上特定点上的激光点的摄影测量面外位移与激光扫描系统捕获的位移进行比较。结果表明，当应用于旋转结构时，两种测量技术在时域和频域均具有良好的相关性。消除基于加速度计的误差后，两种技术之间存在细微差异，这说明摄影测量的光学系统本底噪声确实助长了摄影测量与其他测量技术之间的不一致。

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