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首页> 外文会议>IMechE Conference Transactions 2004-2; International Conference on Vibrations in Rotating Machinery; 20040907-09; Wales(GB) >Automatic post-processing of laser vibrometry data for rotor vibration measurements
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Automatic post-processing of laser vibrometry data for rotor vibration measurements

机译：自动对激光测振数据进行后处理，以进行转子振动测量

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摘要

The Laser Vibrometer constitutes a potentially powerful vibration transducer for measurements directly from rotating components. Radial, axial, pitch/yaw and torsional vibrations can all be measured using either single beam or parallel beam Laser Vibrometers. Successful application, however, requires a clear appreciation of the effects of laser speckle and of how radial and pitch/yaw vibration measurements from rotors contain significant cross-sensitivities to motion perpendicular to the intended measurement. Making use of two orthogonal vibration measurements and an independent speed measurement it is possible to eliminate cross-sensitivity from measured data at all non-synchronous frequencies but a convenient, practical means to undertake the necessary data processing has not been available until now. A Lab VIEW based real-time version of this essential resolution technique will be presented for the first time in this paper. This paper describes a number of example measurements. Radial and pitch/yaw vibration measurements will demonstrate the use of the resolution technique to show effects such as the excitation of the first bending mode of the crankshaft. A torsional vibration measurement on a crankshaft pulley will show the influence of speckle noise and alignment issues will be discussed to limit the pitch/yaw vibration sensitivity. Differential torsional measurements on rotating components can be used to examine, for example, the twisting across a flexible coupling and the stretching of a drive be speckle effects are again important.
机译：激光测振仪构成了潜在强大的振动传感器，可直接从旋转组件进行测量。径向，轴向，俯仰/偏航和扭转振动都可以使用单光束或平行光束激光振动计进行测量。然而，成功的应用需要清楚地了解激光散斑的影响，以及转子的径向和俯仰/偏航振动测量如何对垂直于预期测量的运动具有明显的交叉敏感性。利用两个正交振动测量和一个独立的速度测量，可以从所有非同步频率的测量数据中消除交叉敏感度，但是到目前为止，还没有一种方便，实用的方法来进行必要的数据处理。本文将首次展示基于Lab VIEW的基本分辨率技术的实时版本。本文介绍了许多示例测量。径向和俯仰/偏航振动测量将演示分辨率技术的使用，以显示效果，例如激发曲轴的第一弯曲模式。曲轴皮带轮的扭转振动测量将显示斑点噪声的影响，并将讨论对准问题以限制俯仰/偏航振动灵敏度。旋转部件上的差扭测量可用于检查，例如，挠性联轴器上的扭转和传动带的拉伸；斑点效应也很重要。

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