高激励下微穿孔板吸声峰随流速的变化
On the variations of acoustic absorption peak with flow velocity in Micro-Perforated Panels at high level of excitation
摘要：
对微穿孔板在高压激励下的声学特性进行了理论和实验研究。提出了一种基于Forcheimer的射孔孔眼流速状态的模型。该模型在相对较高的雷诺数和较低的马赫数下是有效的。实验方法包括在阻抗管中的三个不同位置处测量声压，通常在阻抗管中考虑的两个测量位置和在MPP的后表面附近的一个测量位置。阻抗管配备了一个压力驱动器，而不是通常的扬声器，并能够提供高达160 dB的高声压水平。测试了由钢和聚丙烯制成的几个MPP试样。使用随机噪声或正弦激励在200和1600 Hz之间的频率范围内进行测量的MPP支持的空气腔。据观察，吸收的最大值可以是穿孔中的流速的正函数或负函数。这表明存在作为流速的函数的最大吸收。这种行为是由模型预测和实验证实。
英文摘要：
The acoustic behavior of micro-perforated panels (MPP) is studied theoretically and experimentally at high level of pressure excitation. A model based on Forcheimer's regime of flow velocity in the perforations is proposed. This model is valid at relatively high Reynolds numbers and low Mach numbers. The experimental method consists in measuring the acoustical pressure at three different positions in an impedance tube, the two measurement positions usually considered in an impedance tube and one measurement in the vicinity of the rear surface of the MPP. The impedance tube is equipped with a pressure driver instead of the usual loudspeaker and capable of delivering a high sound pressure level up to 160 dB. Several MPP specimens made out of steel and polypropylene were tested. Measurements using random noise or sinusoidal excitation in a frequency range between 200 and 1600 Hz were carried out on MPPs backed by air cavities. It was observed that the maximum of absorption can be a positive or a negative function of the flow velocity in the perforations. This suggests the existence of a maximum of absorption as a function of flow velocity. This behavior was predicted by the model and confirmed experimentally.
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