中文摘要：

针对立体管网微泄漏实时监测系统搭建的关键技术问题,对国内外学者的相关研究进行了梳理,归纳为3个方面：1）在提取故障频率信号时如何避免回声混叠的影响,提高相关性的延时估计精度;2）在管网分叉结构下,如何辨别信号传播路径,如何定位泄漏源的位置;3）在信息数据收发延时不确定的情况下,如何保证立体管网泄漏实时监测系统的时间同步精度。通过对国内外管网泄漏监测技术的比较发现,基于声发射传感器网络的立体管网泄漏实时监测,对于解决探测易燃、易爆气/液体管道运输中的微弱泄漏问题具有较大优势。

英文摘要：

Aiming at the key technical problems encountered by domestic and foreign scholars in building the real-time monitoring system for the micro leak of three-dimensional pipe networks,the paper classifies the problems into three aspects：1）in the extraction of fault signal frequency,how to avoid the effect of the mixed echo stack and improve the delay estimation accuracy of the correlation;2）in network bifurcation structure,how to discern the signal propagation path,and how to locate the leak source;3）under the uncertainly delay in transmitting and receiving information data,how to ensure the time synchronization accuracy of the real-time monitoring system for the three-dimensional pipe network leakage.Through the comparison of the monitoring technologies for the pipe network leakage at home and abroad,it shows that the acoustic emission sensor network based three-dimensional pipeline leak real-time monitoring has great advantages in detecting the weak leakage of flammable and explosive gas/liquid transportation pipelines.