均匀流场拉条模型颤振导数识别试验研究

Testing study of determination of flutter derivatives by taut strip model in smooth flow

拉条模型作为介于全桥气弹模型和节段模型之间的一种气弹模型,在以往的研究中,常用来比较分析节段模型和全桥气弹模型试验结果的差异而使用,而没有利用该模型进行主梁断面颤振导数识别的研究报道。本文则引入模态参数识别方法进行拉条模型颤振导数识别,并设计了一个平板断面的拉条模型,在均匀流场下进行了颤振导数识别试验研究,与理想平板颤振导数理论解进行了比较,试验结果与理论解的吻合说明了拉条模型颤振导数识别方法的可靠性。

Taut strip model is an aeroelastic model, which can be regarded as in-between model between sectional model and full aeroelastic bridge model. In old practice, the model was used to compare the difference of the results between sectional models and full aeroelastic models. Determination of flutter derivatives by taut strip model has rarely been studied. In this paper, modal parameter identification technique is introduced into identification of flutter derivatives by taut strip model. A thin-plat taut strip model is designed, and it is used in smooth flow to determine flutter derivatives. In the end, comparison with theoretical flutter derivatives of thin plate section is undertaken to validate the reliability of the theory.