摘要
用有限元方法建立了地下管线弹性波探测系统模型,以瑞利阻尼渐变吸收层有效的模拟了无穷远边界。分析了力源激励的弹性波传播的方向特性。根据接收的回波信号,提出用相位检测判断管线阻抗特性的方法。设计了四种典型的管线分布,并进行了频谱分析,发现求解的探测系统传递函数能较好的反映管线分布的相关信息。并通过实验模型验证所做的分析。
A finite element model of elastic waves in underground pipeline detection was established.And the infinite boundary was realized using an absorbing layer with gradually increased Rayleigh damping.Four models with typical spatial relationship of pipelines were studied,and the frequency spectral character of back waves was analyzed.The results showed that transfer functions of detecting systems can reveal some space information of underground pipelines.The calculation and analyses above were in good agreement with experimental results.
出处
《振动与冲击》
EI
CSCD
北大核心
2010年第10期56-60,112,共6页
Journal of Vibration and Shock
关键词
弹性波
地下管线探测
有限元
相位检测
传递函数
elastic waves
underground pipeline detection
finite element
phase detection
transfer function
