管道内压力对纵模导波传播特性的影响

工程应用中的管道内部往往存在一定的介质，这些介质会对管内壁产生一定的压力，研究超声导波技术对管道进行检测时，介质产生的压力对超声导波传播特性的影响非常重要。采用数值模拟方法研究了管道内液体介质压力对超声导波传播的影响，分析了不同激励频率和不同介质压力时的导波衰减特性，并搭建了压力管道实验系统。实验结果表明，超声导波在管道内传播时传播速度不随管内压力的变化而变化。

Effects of Pipe Pressures on Longitudinal Mode Guided Wave Propagations

In engineering applications, the internal walls of pipelines tended to have mediums, which might produce pressures on the pipeline walls. When the ultrasonic guided wave technique was revealed to detect these pipelines, medium pressures whether or not to have effects on the propagation characteristics of ultrasonic guided wave were a very important problem. Liquid medium pressures in the pipelines were studied herein on the influences of ultrasonic guided wave propagation through numerical simulation method, guided wave attenuation properties in the different excitation frequencies and medium pressures were analyzed, and pressure pipeline experimental system was set up. The experimental results show that the ultrasonic guided wave propagation in the pipes does not change with the changes of inside pressures.