北京水务Issue(2)：29-35,7.DOI:10.19671/j.1673-4637.2024.02.006
PCCP管道断丝声波特征研究
Study on acoustic wave characteristics caused by steel wire fracture of PCCP pipeline
摘要
Abstract
In the operation of prestressed concrete cylinder pipe(PCCP),it is inevitable to produce wire fracture.The phenomenon of wire breakage may lead to the risk of pipeline explosion in pipeline operation.In this paper,the dynamic process of pipeline wire fracture was analyzed based on the wire fracture acous-tic signal monitored by optical fiber acoustic sensing equipment.The time-frequency spectrum of acoustic signal was obtained by ICEEMDAN algorithm and Hilbert transform.Combined with the time-frequency spectrum,the nonlinear dynamic process of the pipeline was analyzed.The high-frequency impact excita-tion is generated during the rebound process of the steel wire.The nonlinear dynamic process of the pipe-line is a combination of'M'and'V'stripes in the time-frequency spectrum,and the vertex of the V-shaped stripe appears after the first peak of the frequency corresponding to the'M'stripe.Besides,the frequency variation trend of the steel wire is opposite to that of the concrete vibration frequency,and two fringes with opposite frequency variation trends can be observed in the time-frequency spectrum.The extraction and identification of the nonlinear characteristics of the acoustic signal of the broken wire of the PCCP pipeline can provide a useful reference for the online monitoring of the broken wire of the PCCP pipeline.关键词
PCCP/断丝/声波/时频谱/非线性特征Key words
PCCP/wire fracture/acoustic wave/time-frequency spectrum/nonlinear characteristics分类
建筑与水利引用本文复制引用
张晓勇,王成刚,邵青,王建慧,陈新,申阳..PCCP管道断丝声波特征研究[J].北京水务,2024,(2):29-35,7.基金项目
北京市科技计划课题(Z201100008220004):"北京南水北调PCCP检(监)测装备及安全评估技术研发与示范". （Z201100008220004）
