CAJ | 학술논문

利用声信号的相关分析方法检测载流管道的泄漏,在工程上有重要现实意义.但是对于海底管道,由于声信号的传播速度会受到管道周围土壤的影响,给准确定位漏损点带来一定的误差.文章针对海底载流管道这一典型的土—管—液三相耦合问题,推导了管—土滑动接触状态下的轴对称振动波数方程,得到了低频域流体波(s=1)和壳体压缩波(s=2)振动波数的简化解析表达式,并进行了数值计算与分析.结果表明,在较低的频段内,弹性介质中载流管道的波数随频率呈线性变化,管外土介质主要体现以刚度形式影响波数,使流体波(s=1)波数有减少趋势(即可加快波的传播速度),而对壳体压缩波波数(s=2)的影响较小.研究结论可为海底载流管道漏损的精确检测提供理论支持.
이용성신호적상관분석방법검측재류관도적설루,재공정상유중요현실의의.단시대우해저관도,유우성신호적전파속도회수도관도주위토양적영향,급준학정위루손점대래일정적오차.문장침대해저재류관도저일전형적토—관—액삼상우합문제,추도료관—토활동접촉상태하적축대칭진동파수방정,득도료저빈역류체파(s=1)화각체압축파(s=2)진동파수적간화해석표체식,병진행료수치계산여분석.결과표명,재교저적빈단내,탄성개질중재류관도적파수수빈솔정선성변화,관외토개질주요체현이강도형식영향파수,사류체파(s=1)파수유감소추세(즉가가쾌파적전파속도),이대각체압축파파수(s=2)적영향교소.연구결론가위해저재류관도루손적정학검측제공이론지지.
@@@@Correlation technique with acoustics signal used to detect water leaks in fluid-filled pipes has important engineering significance. But for seabed fluid-filled pipes, it will have problem to locate leakage because the acoustics signal will be influenced by the surrounding soil. In the study, with the fully consid-ering three-phase coupling between soil, pipe and fluid, pipe equations for n=0 axisymmetric wave motion are derived for a fluid-filled pipe sliding contact with seabed. The simplified expressions are deduced based on the low frequency approximations for two n=0 waves in a fluid-filled pipe, the s=1 wave and s=2 wave, which correspond to a predominantly fluid-borne wave and a compressional wave in the shell, respectively. Numerical calculation and analysis are carried out subsequently. It is found that the wavenumber varies lin-early with frequencies at low frequency bands, and the effect of surrounding soil acts as stiffness compo-nents, which makes the fluid-borne wave propagate more faster while has little effect on the shell wave. The results could give some theoretic help for precisely leak detection.