隧道消防输水管道泄漏信号增强技术研究

Research on leakage signal enhancement for tunnel fire pipeline

利用隧道消防输水管道水泵启动加压开始和结束时的水压差,提出一种泄漏信号增强技术。该技术利用振动传感器,通过监测两个水压状态下振动信号幅度差的方法实现对泄漏的监测,可在一定程度上提高泄漏信号的信噪比。通过理论推导说明了该技术的基本原理,由数值仿真对该技术的特性进行了深入分析,发现在一定条件下,该技术相较于利用恒定水压条件下振动信号的技术可将泄漏信号增强到近3倍。根据该技术的特点提出了实现算法,通过数值仿真对算法进行了论证,发现振动信号幅度差判定阈值的合理选取有助于降低对泄漏状态的漏判率以及对非泄漏状态的错判率。

An leakage signal enhancement technique is proposed,and this technique is realized by using the water pressure difference between the pressures when the pumping for the tunnel fire pipeline just starts and ends.In this technique,to improve the signal to noise ratio,the vibration sensor is adopted to detect the amplitude difference between the two vibration signals under the two water pressures mentioned above,which is used for detecting the leakage.The basic principles of this technique is described.By the numerical simulation,the characteristic of this technique is deeply analyzed,and it is found that compared with the technique,which uses the vibration signal under the constant water pressure,the proposed technique in this paper could enhance the leakage signal by 3 times.Based on the characteristic of this technique,the algorithm to realize this technique is proposed,which is verified by the numerical simulation.And it is found that it is helpful to decrease the missing rate of the leakage situation and misjudgment rate of no leakage situation when the threshold of the vibration signal amplitude is optimized.