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中文摘要：
针对超声导波检测难以准确判定管道缺陷的问题,通过分析超声导波遇管道缺陷后其回波的传播,提出了以波谱法来定位和定量管道缺陷。采用ANSYS软件仿真了T（0,1）模态超声导波在带缺陷管道中的传播,得到检测的幅值波谱图,发现波谱图中缺陷处的颜色总是最先变化;通过分析所有节点同一时间坐标信号的幅值,发现相对最大缺陷信号幅值,幅值衰减在1/10内的节点数与缺陷的周向尺寸之间存在确定的系数关系。
英文摘要：
It is difficult to accurately determine the pipeline defects using ultrasonic guided wave technology. The propagation of defect wave is analyzed when the ultrasonic guided wave passes through the defect of the pipeline, and a method for determining the defect＇ s location and size by using the wave spectrum is proposed. ANSYS simula- tion of the propagation of the T （0, 1 ） mode ultrasonic guided wave in a pipeline with defects is performed to obtain the amplitude spectrum of the detection. It is found that the color of the defect position is always change first ; the co- ordinate amplitude of the all nodes＇ signal at the same time shows that there is a certain coefficient between the num- ber of nodes which the amplitude attenuation below 1/10 and the defect＇ s circumferential dimension.
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