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Novel Nonstationarity Assessment Method for Hypersonic Flutter Flight Tests

机译：高超声速颤振飞行试验的非平稳性评估新方法

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摘要

Hypersonic aircraft have been rapidly developed in recent years both theoretically and experimentally. Aerothermoelastic simulation is very challenging due to its inherent complexity, but physical tests are a workable approach. Flutter tests with variable speed are a popular alternative to hypersonic tests which provide nonstationary structural response data. This paper proposes a nonstationarity assessmentmethod based on energy distribution in the time-frequency domain. The proposed method reveals the nonstationarity level corresponding to the appropriatemodal identification algorithmor flutter boundary prediction ( FBP) method. Several classic flutter criteria are utilized to build a hypersonic aircraft FBP framework. Numerical simulation and experimental applications demonstrate the effectiveness and feasibility of the proposed method, which facilitates accurate flutter predictions for the subcritical turbulence response during hypersonic flutter flight.
机译：高超音速飞机近年来在理论和实验上都得到了迅速发展。空气热弹性模拟由于其固有的复杂性而非常具有挑战性，但是物理测试是一种可行的方法。变速颤振测试是高超声速测试的流行替代方法，后者提供了非平稳的结构响应数据。提出了一种基于时频域能量分布的非平稳性评估方法。所提出的方法揭示了与适当的模态识别算法或颤动边界预测（FBP）方法相对应的非平稳性水平。几种经典的颤振准则被用于构建高超音速飞机FBP框架。数值模拟和实验应用证明了所提方法的有效性和可行性，该方法有助于在高超声速颤振飞行过程中对亚临界湍流响应进行精确的颤振预测。

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  • 来源
    《Mathematical Problems in Engineering》 |2018年第14期|9742591.1-9742591.12|共12页
  • 作者

    Zheng Hua; Liu Junhao; Duan Shiqiang;

  • 作者单位

    Northwestern Polytech Univ, Sch Power & Energy, Xian 710072, Shaanxi, Peoples R China;

    Northwestern Polytech Univ, Sch Power & Energy, Xian 710072, Shaanxi, Peoples R China;

    Northwestern Polytech Univ, Sch Power & Energy, Xian 710072, Shaanxi, Peoples R China;

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