Atomic Energy Commission (CEA), Direction of Military Applications (DAM), Ile de France (DIF), 91297, Arpajon, France.
Atomic Energy Commission (CEA), Direction of Military Applications (DAM), Cesta, 33114, Le Barp, France.
J Acoust Soc Am. 2023 Feb;153(2):1272. doi: 10.1121/10.0017319.
Infrasound signals are detectable from many different sources, such as earthquakes and man-made explosions. Wind-generated turbulent noise can mask incoming infrasound signals; however, pipe-array wind-noise-reduction systems (WNRSs) have been designed to reduce the level of noise in the observed pressure time series. Given that the arrival times of the signals need to be well-known to calculate the source back azimuth and trace velocity, the response of the WNRS must be known in magnitude and phase. Previous work has been performed to optimize these systems and effectively model them. The goal of this research is to determine the effects of different defects which may occur during normal operation in typical field-experiment conditions. The models were extended to include the effects of defective systems, such as blockages or leaks. It was found that these models could effectively recreate the responses observed in an experimental setting, and several different defects were tested and are summarized in this paper.
次声信号可从许多不同的来源检测到，如地震和人为爆炸。风产生的湍流噪声会掩盖传入的次声信号；然而，已经设计了管道阵列降噪系统（WNRS）来降低观测压力时间序列中的噪声水平。由于需要知道信号的到达时间，以便计算源后向方位角和迹线速度，因此必须知道 WNRS 的幅度和相位响应。之前已经进行了优化这些系统并有效地对其进行建模的工作。本研究的目的是确定在典型现场实验条件下正常运行期间可能出现的不同缺陷的影响。这些模型被扩展到包括有缺陷的系统的影响，如堵塞或泄漏。结果发现，这些模型可以有效地再现实验环境中观察到的响应，并对几种不同的缺陷进行了测试，并在本文中进行了总结。
