供水管网水压实时监测系统滤波控制技术

Filter Control Technology for Real-time Monitoring System of Water Pressure in Water Supply Network

干扰信号过滤技术在许多实际应用中扮演着十分重要的角色,包括被用于对城区供水管网中采集到的水压信号进行针对性处理。传感器获取的水压信号中常包含大量的干扰信号,其频率成分和表现形式往往是非常复杂的,并且会随着时间或在管线上的不同位罝呈现出明显的变化。为了能够在管网中更准确地对异常事件信号进行监测,采取措施去除或衰减干扰信号分量是很有必要的。文中将介绍一种实用、可靠的自适应滤波方法,专门用于对管网水压信号中单个或多个干扰信号的频带进行阻断。这种算法结合了频谱分析技术、峰值搜索技术和多频率下的带阻滤波控制过程。离散带附频率的品质因子可通过频谱分析计算获得。该方法在上海临港实际工程项目被用于处理高频水压数据,并进行了系统化的功能验证。通过在不同时间和空间位罝上对其性能进行综合评估,证实了该算法不仅有助于提高对水压异常信号的准确检测,也能够有效地减少对管流中各类异常事件的误报。测试结果表明该方法具有良好的工程应用性。

Interference signal filtering technology plays an important role in many practical application,including the targeted processing of water pressure signals collected in the urban water supply network.The hydraulic pressure signal with specific processing sensors signal often contains a lot of interference signals,and its frequency composition and representation are often very complex,and will show obvious changes with time or different positions on the pipeline.In order to monitor the abnormal events signal more accurately in the pipe network,it is necessary to take measures to remove or attenuate the interference signal component.This paper introduces a practical and reliable adaptive filtering method,which is specially used to block the frequency band of single or multiple interference signals in water pressure signal of pipe network.This algorithm combines spectrum analysis technology,peak search technology and multi frequency band stop filter control process.The quality factor of discrete band stop frequency can be obtained through frequency spectrum analysis.This method has been used to process high frequency water pressure data in Shanghai Lingang engineering project,and has been verified systematically.Through the comprehensive evaluation of its performance at different time and space locations,it is proved that this algorithm is not only helpful to improve the accurate detection of abnormal water pressure signals,but also can effectively reduce the false alarm of various abnormal events in pipe flow.The test results show that the method has good engineering applicability.