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首页> 外文会议>AIAA aviation forum;AIAA fluid dynamics conference >Extraction and analysis of the second mode instability wave based on Singular-value decomposition and Empirical mode decomposition
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Extraction and analysis of the second mode instability wave based on Singular-value decomposition and Empirical mode decomposition

机译：基于奇异值分解和经验模态分解的二阶不稳定性波提取与分析

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摘要

Hypersonic stability experiment was performed at FD-07 wind tunnel to research the boundary layer transition mechanism. A new analysis method based on singular-value decomposition (SVD) and empirical mode decomposition (EMD) was firstly implemented to extract the second mode instability wave from pressure fluctuation signal. Subsequently, the modulation characteristics of the second mode instability wave were analyzed by the complex digital demodulation technique. The results indicated that the second mode instability interacted with low frequency signals during hypersonic boundary layer transition, and the phase modulation was the most effective interaction mechanism.
机译：在FD-07风洞进行了高超声速稳定性实验，研究了边界层过渡机理。首先采用基于奇异值分解和经验模态分解的新分析方法，从压力波动信号中提取第二模态不稳定性波。随后，通过复数数字解调技术分析了第二模式不稳定性波的调制特性。结果表明，第二模式不稳定性在高超声速边界层过渡过程中与低频信号相互作用，而相位调制是最有效的相互作用机制。

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