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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Experimental Validation of a Fast Forward Model for Guided Wave Tomography of Pipe Elbows
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Experimental Validation of a Fast Forward Model for Guided Wave Tomography of Pipe Elbows

机译：管弯头导波层析成像快进模型的实验验证

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Ultrasonic guided wave tomography (GWT) methods for the detection of corrosion and erosion damage in straight pipe sections are now well advanced. However, successful application of GWT to pipe bends has not yet been demonstrated due to the computational burden associated with the complex forward model required to simulate guided wave propagation through the bend. In a previous paper [Brath et al., IEEE Trans. Ultrason., Ferroelectr., Freq. Control, vol. 61, pp. 815-829, 2014], we have shown that the speed of the forward model can be increased by replacing the 3-D pipe bend with a 2-D rectangular domain in which guided wave propagation is formulated based on an artificially inhomogeneous and elliptically anisotropic (INELAN) acoustic model. This paper provides further experimental validation of the INLEAN model by studying the traveltime shifts caused by the introduction of shallow defects on the elbow of a pipe bend. Comparison between experiments and simulations confirms that a defect can be modeled as a phase velocity perturbation to the INLEAN velocity field with accuracy that is within the experimental error of the measurements. In addition, it is found that the sensitivity of traveltime measurements to the presence of damage decreases as the damage position moves from the interior side of the bend (intrados) to the exterior one (extrados). This effect is due to the nonuniform ray coverage obtainable when transmitting the guided wave signals with one ring array of sources on one side of the elbow and receiving with a second array on the other side.
机译：用于检测直管段中腐蚀和腐蚀损伤的超声导波层析成像（GWT）方法现在已经很先进。但是，由于与复杂的前向模型相关联的计算负担，以模拟导波在弯管中的传播，GWT尚未成功应用于弯管。在以前的论文中[Brath等，IEEE Trans。 Ultrason。，铁电公司，频率。控制卷61，第815-829页，2014年]，我们已经表明，可以通过将2-D矩形域替换为3-D弯管来提高前向模型的速度，在该二维域中，基于人工模拟了导波传播不均匀和椭圆各向异性（INELAN）声学模型。本文通过研究由弯管弯头上的浅缺陷引入而引起的行程时间偏移，为INLEAN模型提供了进一步的实验验证。实验与仿真之间的比较证实，可以将缺陷建模为对INLEAN速度场的相速度扰动，其精度在测量的实验误差范围内。另外，发现当损伤位置从弯头的内侧（弯曲）向外部弯曲（弯曲）移动时，行程时间测量对损伤存在的敏感性降低。这种效果是由于当在肘部的一侧以一个环形源阵列发射导波信号而在另一侧以另一个阵列发射导波信号时，可获得不均匀的射线覆盖率。

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