Estimating the spectrum of leak noise in buried plastic water distribution pipes using acoustic or vibration measurements remote from the leak
Estimating the spectrum of leak noise in buried plastic water distribution pipes using acoustic or vibration measurements remote from the leak
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DOI：
10.1016/j.ymssp.2020.107059
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发表时间：
2021-01
影响因子：
8.4
通讯作者：
O. Scussel;M. Brennan;F. Almeida;J. Muggleton;E. Rustighi;P. Joseph
中科院分区：
文献类型：
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作者：
O. Scussel;M. Brennan;F. Almeida;J. Muggleton;E. Rustighi;P. Joseph
在分析和数值方法中，需要一个合适的泄漏噪声源模型来研究埋地水管泄漏噪声的远程测量特性。在实践中，在源处测量泄漏噪声是极其困难的，因此需要一种逆方法来从在方便的接入点处的泄漏的任一侧进行的测量来预测这一点。本文提出了这样一种方法，并说明了使用四个数据集从三个不同的测试站点的方法。该方法要求噪声根据传感器检测到泄漏噪声的频率范围内的简单波传播模型在管道中传播。使用测量的数据，估计波数的真实的部分和虚部，并且这些部分与两个传感器之间的泄漏的估计位置一起，估计对应于泄漏位置的任一侧的管道的区段的频率响应函数。如果进行压力测量，则可以估计泄漏噪声频谱的水平和形状，但是如果使用加速度计，则仅可能估计频谱的形状。从所提出的测量，它被发现，这是不可能的状态，明确地说，泄漏噪声频谱衰减根据一个特定的频率幂律。有一些证据表明它以ω-1的频率幂律衰减，这与以前的实验室实验一致，但这并不是在所有情况下都是确定的。
An appropriate model of leak noise at source is necessary in analytical and numerical approaches to investigate the characteristics of leak noise measured remotely from the leak in buried water pipes. It is extremely difficult to measure leak noise at source in practice, so an inverse method is needed to predict this from measurements made either side of the leak at convenient access points. This paper presents such a method, and illustrates the approach using four data sets from three different test sites. The method requires that the noise propagates in the pipe according to a simple model of wave propagation within the frequency range over which leak noise is detected at the sensors. Using the measured data, the real and imaginary parts of the wavenumber are estimated, and these, together with an estimated position of the leak between the two sensors, the frequency response functions corresponding to the sections of the pipe either side of the leak position are estimated. If pressure measurements are made, then both the level and shape of the leak noise spectrum can be estimated, but if accelerometers are used then only an estimate of the shape of the spectrum is possible. From the measurements presented, it is found that it is not possible to state categorically that the leak noise spectra decays according to a particular frequency power law. There is some evidence that it decays with a frequency power law of ω-1, which agrees with previous laboratory based experiments, but this is not definitive in all cases.