基于瞬变流法的管道泄漏定位研究  

Research on pipeline leak location based on transient flow method

作　　者：康宪芝 李健[1] 张宇[1] 王伟魁[1] 陈瑞东 

机构地区：[1]天津大学精密测试技术与仪器国家重点实验室,天津300072 [2]中石油秦皇岛输油气分公司,河北秦皇岛066200

出　　处：《计算机工程与应用》2015年第19期255-259,共5页Computer Engineering and Applications

基　　金：国家自然科学基金青年基金(No.51004076)

摘　　要：管道系统的微小泄漏会影响瞬变压力波的波形和衰减特性。用Flowmaster流体仿真软件建立了管道模型,控制阀门小开度快速关闭,使管道内部产生瞬变流动,用短时傅里叶变换对管道泄漏发生前后的压力波信号进行时频分析,提取出前三次谐波分量的归一化幅值,通过指数拟合得到有无泄漏时各谐波分量幅值的衰减率,计算不同谐波分量泄漏衰减率的比值对管道泄漏进行定位。结果表明,用该方法提取的谐波分量可以准确地计算出各次谐波的衰减率,从而提高了泄漏的定位精度并能够检测到0.17%的微小泄漏。The minor leaks of pipeline system will affect transient waveforms and its attenuation characteristics. A pipe- line model is built by using fluid simulation software Flowmaster. Short-time Fourier transform is used to analyze the pres- sure signals in time-frequency domain, which are generated by closing the valve partially in a short time for both leak and no-leak case. Damping factors of the first three harmonic components extracted from the time-frequency analysis results are calculated by exponential fitting. The leak position is obtained by calculating the ratios of leak-induced damping rates. The results show that the harmonic components extracted from the time-frequency analysis results can be used to exactly calculate the damping rates, which can improve the accuracy of leak location. The leakage can be as small as 0.17%.

关 键 词：管道系统 泄漏定位 瞬变流 时频分析 

分 类 号：TN911.6[电子电信—通信与信息系统]