A wavelet-based beamforming method is performed in this investigation to analyze moving acoustic sources in the time-frequency domain, which is of scientific significance and practical importance. The particular problem considered here is the interaction noise from an airfoil and the downstream rotor in the presence of a moving flow, which could find realistic applications in next-generation underwater and aviation systems. A realistic experimental setup is prepared with a rotating blade and the airfoil in an anechoic wind tunnel. The results show that the wavelet-based beamforming method is very suitable for unsteady sound source imaging, which would be able to strengthen the time-frequency analysis capability of acoustic imaging tests and, consequently, possibly leads to deepened physical insights of various transient and moving systems in underwater and aerospace systems.

中文翻译：

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小波波束形成的机翼-转子相互作用噪声实验研究。

本研究采用基于小波的波束形成方法对时频域运动声源进行分析，具有科学意义和现实意义。此处考虑的特定问题是在存在流动的情况下来自机翼和下游转子的相互作用噪声，这可能会在下一代水下和航空系统中找到实际应用。使用旋转叶片和无声风洞中的机翼来准备逼真的实验装置。结果表明，基于小波的波束形成方法非常适合于非稳态声源成像，这将能够增强声学成像测试的时频分析能力，因此，