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首页> 外文期刊>Journal of aerospace engineering >Ultrasonic Lift Measurement Technique for Flow-Induced Structural Vibrations
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Ultrasonic Lift Measurement Technique for Flow-Induced Structural Vibrations

机译：流动引起的结构振动的超声波升力测量技术

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摘要

Deficiencies exist in our current ability to measure lift forces in wind-tunnel experiments on vibrating structures in a fluid flow. The ultrasonic lift measurement (ULM) technique has been previously developed to measure time-averaged fluid circulation and lift on stationary structures. The ULM technique is based on measuring transit times of acoustic pulses along paths enclosing the structure. A quasi-steady method based on the Kutta-Joukowski theorem has been used in the past to convert fluid circulation to lift values in ULM studies. In this paper, the largely unstudied extension of the ULM technique to measure unsteady lift forces in flows involving structural vibration is considered. Analytic methods are developed that can be used to properly convert the instantaneous circulation measurements (attainable from ULM experiments) to lift values. These unsteady methods are validated by using numerical simulations of flows over flat plates undergoing oscillating motion. It is shown that the addition of unsteady terms provides a method with improved accuracy over the previous quasi-steady assumption. The methods are also applied to ULM data from an oscillating airfoil experiment in a preliminary study.
机译：我们目前在风洞实验中测量流体中振动结构的升力的能力存在缺陷。超声波升力测量（ULM）技术是先前开发的，用于测量时间平均的流体循环和固定结构上的升力。 ULM技术基于测量声脉冲沿着围绕结构的路径的传播时间。在ULM研究中，过去曾使用基于Kutta-Joukowski定理的准稳态方法将流体循环转换为升力值。在本文中，考虑了ULM技术的大量未被研究的扩展，以测量涉及结构振动的流动中的不稳定升力。开发了可用于将瞬时循环测量值（可从ULM实验获得）正确转换为提升值的分析方法。这些不稳定的方法通过使用经过振荡运动的平板上的流动的数值模拟来验证。结果表明，与先前的准稳态假设相比，增加非稳态项可提供一种精度更高的方法。在初步研究中，该方法还应用于来自振荡翼型实验的ULM数据。

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