ON THE MULTIPLE MICROPHONE METHOD FOR MEASURING IN-DUCT ACOUSTIC PROPERTIES IN THE PRESENCE OF MEAN FLOW
ON THE MULTIPLE MICROPHONE METHOD FOR MEASURING IN-DUCT ACOUSTIC PROPERTIES IN THE PRESENCE OF MEAN FLOW
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DOI：
10.1121/1.421289
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发表时间：
1998-06
影响因子：
2.4
通讯作者：
S. Jang;J. Ih
中科院分区：
文献类型：
--
作者：
S. Jang;J. Ih
目前，ASTM E1050-90中规定的测量管道内声学特性的标准是双传声器方法。然而，关于采用多测点最小二乘法和宽带激励来提高双传声器方法的频率响应的研究结果已有报道。本文研究了多传声器方法中相对测量位置的变化对声量估计误差的影响。理论和实验结果表明，在可能的传感器定位方式中，传感器等距定位在有效测量频率范围内误差最小。另外，通过增加等距传感器的数量，可以提高测量精度，拓宽有效频率范围。文中给出了测量实例，结果支持了结论。
Nowadays, the two-microphone method is accepted as the standard as specified in ASTM E1050-90 for measuring in-duct acoustic properties. However, research results on using the least square method with multiple measurement points and broadband excitation have been reported for enhancing the frequency response of the two-microphone method. In this paper, the effects of varying the relative measurement positions on errors in the estimation of the acoustic quantities is studied for the multiple microphone method. Both the theoretical and experimental results show that, among possible sensor positioning configurations, the equidistant positioning of sensors yields the smallest error within the effective measurement frequency range. In addition, it is noted that the measurement accuracy can be increased and the effective frequency range can be widened by increasing the number of equidistant sensors. Measurement examples are shown and the results support the findings.