一种基于FFT变换的供水管网节点压力频域分析方法

A Frequency Domain Analysis Method for Node Pressure in Water Supply Pipe Network Based on FFT

供水管网出现漏损点时,由于其隐蔽性不易被察觉,长时间的漏损积累不仅造成水资源浪费,也会出现供水产销差的问题。将频域分析法引入到供水行业,提出一种基于FFT变换的供水管网节点压力频域分析方法,首先通过编写程序调用EPANET对供水管网进行运行优化模拟,然后将求解的最优泵阀调度方案反代入模拟漏损点工况内,借助傅里叶变换将随时间变化的节点压力转换为振幅信号,从频域的角度分析管道节点压力,从而判断漏损点距离管道起始节点的长度范围。通过验证,与以往基于压力分析漏损点相比,该方法可从频域信号视角来判断管道是否正常运行及漏损点位置范围,有利于供水行业智慧化。

When there is a leakage point in the water supply pipe network,it is not easy to be detected due to its concealment,and the long-term leakage accumulation will not only cause waste of water resources,but also lead to the problem of poor production and marketing of water supply.The frequency domain analysis was introduced into the water supply industry,and a node pressure of water supply pipe network based on FFT was proposed.Firstly,the specific method is called EPANET by writing a program to optimize the operation simulation of water supply pipe network,and then solve the optimal pump and valve scheduling scheme back into the simulated leakage point working condition.With the help of Fourier transform to convert the time-varying node pressure into an amplitude signal,the pipeline node pressure was analyzed from the perspective of the frequency domain.Therefore,the length range between the leakage point and the starting node of the pipeline was judged.Through verification and compared with the previous pressure based analysis of the leakage point,the proposed method can judge whether the pipeline is normal operation and the location range of the leakage point from the perspective of frequency domain.