纵模导波在部分埋地管道中的传播特性

基金项目:

北京市自然科学基金资助项目(8062008)

国家自然科学基金资助项目(10602004)

国家科技攻关项目(2006BAK02B01-09)

详细信息

The Propagation Characteristics of Longitudinal Guided Wave in Steel Pipe Partly Buried in Soil

摘要: 研究了纵向模态超声导波在部分埋置于土壤中的管结构中的传播特性, 基于弹性动力学理论, 分别计算和分析了自由管和埋地管的群速度和衰减特性, 并建立了不同埋地长度的有限元模拟, 分析了不同埋地长度对导波传播速度和衰减的影响。通过试验验证, 结果显示, 埋地管道中L(0, 2)模态的群速度不受埋地长度的影响, 而它的幅值衰减与埋地长度成正比关系, 理论分析和有限元模拟结果相吻合。
- 管道 /
- 超声导波 /
- 部分埋地
Abstract: In order to study the propagation characteristics of longitudinal guided wave in partly embedded steel pipe, the authors calculate and analyze, on the basis of elastic dynamics theory, the guide waves group velocity, attenuation and dispersion in free pipe and buried pipe. And on the same time, the FEM model is built and the influence of different embedded length is simulated. The results show the velocity of L(0, 2) mode keeps consistent and its attenuations is proportional to embedded length. The experimental result is consistent with theoretical analysis and FEM simulation.
- Steel pipe /
- Ultrasonic guided waves /
- Partly embedded

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