供水管道漏损的声波检测实验研究-环境工程专业论文.docxVIP

ABSTRACT In 2010, the total length of water pipelines in China had reached 540,000 km and showed a trend of accelerated growth annually. Compared with developed countries, China had higher average water leakage rate, which resulted in a huge amount of leakage of water and caused huge losses and damage to resources, environment and society. Pipeline leakage and sudden pipe burst became the most significant security issues in daily operation of water supply networks. Great efforts would still be needed in reducing pipeline leakage and pipe burst prevention. There was a lot of leakage detection methods in water pipelines, among which acoustic detection were used more often. At present, the management of water pipelines focused on the remedy after leak detection or pipe burst occurred, that was passive detection. However, accident prevention should be transformed from passive rescue to active prevention, which was active detection. So, a leakage survey conducted to do data statistics and analysis. Acoustic passive detection and ultrasonic active detection were experimented and studied in this paper, including: Leakage control methods were investigated in a development zone of North China which had a high level leakage control, including: equipped instruments, leak detection process and instruments usage. Statistical data was collected and a water pipeline leakage database was built. After the influential factors for the leakage were analyzed, it was summarized that leakage inspection should strengthen on the detection of the pipeline accessories, small diameter pipes and cast iron pipes. To build a laboratory acoustic leakage detection device and perform acoustic leakage detection experiments on condition of different pore size, media around pipe, flow and piping accessories. The variation of acoustic signal leakage was: background noise differed from leakage signal, which had a relatively low frequency distribution in the range of 0~1000Hz, while leakage signal was 0~