摘要
由于城市地下燃气管网压力较低,环境噪声复杂,泄漏信号微弱,使得泄漏信号难以利用基于二阶累积量理论的信号处理手段检测到。本文根据双谱理论,利用双谱对高斯有色噪声的有效压制及其保留相位的独特性质,将其应用于低压燃气管道泄漏检测,建立了检测系统模型。利用直接法估算双谱值并给出相应的判断准则。在试验室现有条件下,按照国家标准铺设了一段40m长埋地管道进行泄漏试验。通过试验验证,该方法在中低压管道泄漏检测中有着较好的准确性。
Due to low pressure,complex circumstance noise and weak leakage signal of the urban underground gas pipeline,it is difficult to detect the signal through general signal processing method which is based on the second-order statistics.This paper applies bispectrum that can suppress Colored Gaussian noise and retain signal phase,to the leakage detection of low pressure pipe- line.According to the national standard,a 40-meter-long test system is established.Direct method is used to estimate the bis- pectrum and the corresponding criterion is presented.Experiment results show that this method is availability in leakage detection for the middle-low pressure pipeline.
出处
《新技术新工艺》
2008年第11期42-44,共3页
New Technology & New Process
关键词
双谱
城市地下燃气管网
泄漏检测
声发射
bispectrum
urban underground gas pipeline
leakage detection
acoustic emission
