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Application of acoustically tuned resonators for the improvement of sound insulation in aircraft

机译：声学谐振器在改善飞机隔声性能中的应用

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摘要

One of the aims of the EU project FACE (Friendly Aircraft Cabin Environment) is to reduce aircraft interior noise. For modern aircraft flying at cruise conditions, the turbulent boundary layer is the main source for cabin noise. Normally, the turbulent boundary layer causes the trim panels to vibrate, and hence to radiate sound into the aircraft cabin. The purpose of the present work is to reduce this kind of noise by means of sound insulating trim panels with tuned acoustic resonators1. The length and the radius of these resonators are tuned in such a way that the volume velocities at the vibrating panel surface and at the entrance of the resonators are equal in magnitude but opposite in phase. In this way, maximum reduction of the radiated sound can be achieved for a specified frequency range. Because of the repetitive pattern of the resonators in the panel, the influence of the resonators on the sound radiated in normal direction by the panel is studied with a one-dimensional model. The so-called low reduced frequency model is extended to describe the viscothermal wave propagation in the vibrating resonators. An advantage of the viscothermal effects is that, in the low frequency range, more sound reduction is obtained than if these effects are not present or very small. Calculations show that a large reduction of the radiated sound can be achieved. The model is also validated by experiments in an impedance tube. Good agreement is found between theory and measurements.
机译：欧盟项目FACE（友好机舱环境）的目标之一是减少飞机内部的噪音。对于在巡航条件下飞行的现代飞机而言，湍流边界层是机舱噪声的主要来源。通常，湍流边界层使装饰板振动，从而将声音辐射到飞机机舱中。本工作的目的是通过带有调谐声谐振器的隔音装饰板来减少这种噪声。调节这些谐振器的长度和半径，使得在振动板表面和谐振器的入口处的体积速度大小相等但相位相反。这样，可以在指定的频率范围内最大程度地降低辐射声。由于面板中谐振器的重复图案，使用一维模型研究了谐振器对面板沿法向辐射的声音的影响。扩展了所谓的低降低频率模型，以描述粘性热波在振动谐振器中的传播。粘热效应的一个优点是，在低频范围内，与不存在或很小的情况相比，可以获得更多的降噪效果。计算表明，可以大大降低辐射声。该模型还通过阻抗管中的实验进行了验证。在理论和测量之间找到了很好的一致性。

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