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Study on acoustic time delay localization in boiler tube arrays considering effective sound velocity
Applied Acoustics ( IF 3.4 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.apacoust.2020.107680
Genshan Jiang , Yuechao Liu , Qian Kong , Wenzhuo Hao , Liansuo An

Abstract Based on the study of sound propagation characteristics and acoustic radiation in periodic tube arrays, we found that the wave front differed from the no-tube arrays at the same frequency. The phenomenon indicated that there was different sound velocity in tube arrays. This research considered tube arrays as an effective medium for sound and studied the effective sound velocity at different frequencies in tube arrays. The numeral calculations and experiments shown similar conclusions that the sound velocity was slower than in no-tube arrays one. Acoustic velocity directly affects the accuracy of time delay localization method, and the time delay localization method in acoustic isotropic media is mature. The velocity of low frequency sound wave is isotropic in the arrays, we investigate the variation of sound velocity theoretically and experimentally. The sound demonstrates anisotropy at high frequency region, the effective sound velocity is related to the band gap in the tube arrays. The research has been found that the same frequency has different sound velocity values in different directions. In different directions of tube arrays, the effective sound velocity is used to conduct an one-dimensional acoustic source location experiment. This study can provide an innovative concept and method for leakage location in boiler tube arrays.

中文翻译:

考虑有效声速的锅炉管列声时滞定位研究

摘要 通过对周期管阵列声传播特性和声辐射的研究,发现在同一频率下,波前与无管阵列不同。这种现象表明管阵列中存在不同的声速。本研究将管阵列视为一种有效的声音介质,并研究了管阵列在不同频率下的有效声速。数字计算和实验显示了类似的结论,即声速比无管阵列慢。声速直接影响时滞定位方法的精度,声学各向同性介质中的时滞定位方法已经成熟。低频声波的速度在阵列中是各向同性的,我们从理论上和实验上研究了声速的变化。声音在高频区表现出各向异性,有效声速与管阵列的带隙有关。研究发现,同一个频率在不同方向上具有不同的声速值。在管阵列的不同方向,利用有效声速进行一维声源定位实验。该研究可为锅炉管列泄漏定位提供一种创新的概念和方法。在管阵列的不同方向,利用有效声速进行一维声源定位实验。该研究可为锅炉管列泄漏定位提供一种创新的概念和方法。在管阵列的不同方向,利用有效声速进行一维声源定位实验。该研究可为锅炉管列泄漏定位提供一种创新的概念和方法。
更新日期:2021-01-01
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