Dispersion and attenuation by transmission,reflection, and mode conversion in welded pipes |
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Authors: | Bouko Vogelaar Michael Golombok |
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Affiliation: | 1. Eindhoven University of Technology, Department of Mechanical Engineering, Groene Loper 15, 5600 MB Eindhoven, The Netherlands;2. Shell Global Solutions International B.V., Kessler Park 1, 2288 GS Rijswijk, The Netherlands |
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Abstract: | Torsional wave dispersion and attenuation in an open empty welded pipe are determined from a multi-receiver position reflection experiment. The fundamental torsional wave is dominantly reflected at the free end and the converted non-axisymmetric flexural modes are naturally attenuated. The resulting phase velocity contours are in agreement with theoretical predictions. The transmission losses are quantified and compared to those reflective elements associated with end and weld reflection. At any reflective node, the incident wave is split between back and forward preserved mode scattering (“reflection/transmission”), conversion to other modes plus energy lost by absorption. The ratios for each element are quantified. |
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Keywords: | Guided waves Dispersion Attenuation Welded pipe Transmission loss |
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