Abstract:Through the theoretical analysis of the propagation characteristics of negative pressure waves in a branch pipe network, the feasibility of the negative pressure wave method in the leakage location of heat supply pipelines, was discussed and successively, the feasibility of the negative pressure wave location method and wavelet analysis signal processing method were verified through experimental research.When there is serious pipeline leakage, the pressure at the leakage point suddenly drops obviously and forms a negative pressure water hammer wave.As the negative pressure water hammer wave speed in the pipe is constant, high frequency pressure sensors can capture the dynamic pressure state of the negative pressure wave.The wavelet analysis was used to process and analyze the detected negative pressure wave signal, and the specific time when the propagating negative pressure wave reached each pressure sensor point was determined.
In order to verify the feasibility of the method, an existing pipe network was used to do the test.The test results show that if the delay time of pressure change is taken as an index, the pressure signal processing method can effectively locate the leakage point, and lock the location of the leak point within 1 km,which significantly improves the efficiency of detecting leakage position.
石光辉,齐卫雪,陈鹏,樊敏,李建刚. 负压波与小波分析定位供热管道泄漏[J]. 振动与冲击, 2021, 40(14): 212-218.
SHI Guanghui,QI Weixue,CHEN Peng,FAN Min,LI Jiangang. Experimental study of leakage location in a heating pipeline based on the negative pressure wave and wavelet analysis. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(14): 212-218.
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