| 路炜,文玉梅.供水管道泄漏声信号及其传播特性[J].声学技术,2007,(5):871~876 |
| 供水管道泄漏声信号及其传播特性 |
| Leakage noise and its propagation in water pipeline |
| 投稿时间：2006-06-24 修订日期：2006-09-29 |
| DOI： |
| 中文关键词: 泄漏定位 时延估计 振动 流固耦合 自适应系统辨识 互谱 |
| 英文关键词: leakage location time delay estimation vibration fluid-structure interaction adaptive system identification cross-power spectrum |
| 基金项目: |
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| 中文摘要: |
| 相关仪利用供水管道泄漏时产生的泄漏声波对漏点定位。泄漏信号验证为高斯分布,泄漏声波主要是在管道里的水中传播,与管壁发生流固耦合作用,引起管壁振动。用FIR滤波器对管道系统建模,采用最小均方误差(LMS)自适应系统辨识方法得到管道的冲激响应函数,与线性相位FIR滤波器的冲激响应相比较,表明泄漏声波在传播过程中存在频散。泄漏声信号受各种噪声干扰,根据互谱相位谱信息估计泄漏信号的频带范围,对信号滤波后作时延估计,结果表明,提高了泄漏定位的置信度。 |
| 英文摘要: |
| Leaks in water supply pipelines cause waste of precious resources and endanger the environ-ment. Correlator pinpoints leaks depending on the noise from the leaks. The leakage noise meets Gaussian distribution. The fluid-filled pipe is considerably complicated due to fluid-structure interaction. The radial pipe wall vibration is excited by internal water pressure pulsations arising from water-borne sound. The pipeline system is supposed to be a finite impulse response (FIR) system. Adaptive system identification technique employing least-mean-square (LMS) algorithm is applied to modelling the pipeline and analyzing the prop-agation characteristics of leak noise. Signal dispersion is observed corresponding to the significant asymm-etry displayed by the impulse response of the pipeline. Basing on cross-power spectrum phase,the frequ-ency band of leak signal is obtained. The filtered signals are used in the estimation of time delay. It is indicated that the method improves confidence of locating leak. |
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