经验模态分析法在输气管道保护的应用

Application of EMD Method to Protection of Gas Transmission Pipeline

为解决天然气长输管道泄漏、被挖掘、被车辆碾压破坏等问题,提出将经验模态信号分析法和分布式光纤预警系统结合的方法对输气管道进行实时保护。通过经验模态信号分析法将检测到的电流信号分解为多个固有模态函数分量,然后选择包含主要信息的4个固有模态函数分量进行归一化峭度分析,得到不同事件对应的特征值。将不同事件对应的特征值进行分析和分类并建立数据库,作为后续被检测信号的判断依据。

In order to solve the problems of natural gas transmission pipeline leakage, its damage from excavation, vehicles and so on, the method combined empirical mode decomposition （EMD） method with distributed optical fiber warning system is put forward for real time protection of the pipeline. This method decomposes the signal detected by the optical fiber warning system into a number of intrinsic mode function （IMF） components, and four IMF components containing main information are selected to conduct normalized kurtosis analysis, and the corresponding eigenvalues of different events are obtained. The analysis and classification of the corresponding eigenvalues of different events are performed, and their database is established as a judgment basis for subsequent detected signal.