基于超声导波T(0,1)检测管道缺陷的数值模拟
首发时间:2017-12-29
摘要:为了研究扭转模态在不同形状管道中的传播特性和缺陷的检测能力。本文建立带有缺陷的管道有限元模型,利用有限元软件ABAQUS对T(0,1)模态导波在直管、弯管中的传播过程进行数值模拟研究。导波信号采用汉宁窗调制的正弦信号,激励T(0,1)模态信号。结果表明:最低阶的扭转模态适合于管道的缺陷检测。且50KHz的T(0,1)模态导波对直观、弯管上的缺陷敏感,在缺陷对应的位置上,导波的回波幅值最大,能量也较集中。
关键词: 超声导波;模态;缺陷;T(0 1)
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Numerical simulation of pipeline defects detection based on ultrasonic guided wave T (0,1)
Abstract:In order to study the detection ability of torsional modes in the propagation of different shapes of pipes and defects. In this paper, a finite element model of pipeline with defects was established. The numerical simulation of the propagation of T (0,1) mode guided waves in straight pipe and elbow was carried out by finite element software ABAQUS. The guided wave signal adopts the sinusoidal signal modulated by Hanning window to excite the T (0,1) modal signal. The results show that the lowest order torsional mode is suitable for pipeline defect detection. Moreover, the T (0,1) mode guided wave of 50 KHz is sensitive to the visual and the defects on the elbow. At the position corresponding to the defect, the guided wave has the largest echo amplitude and the more concentrated energy.
Keywords: guided wave mode defect T (0,1)
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