Helical Mode Guided Waves in Pipe Observed by Electromagnetic Acoustic Transducer Array

doi:10.3901/JME.2018.22.038

Abstract

Abstract: As the raising application of guided wave tomography for pipelines, helical mode guided waves have received the attention of researchers in recent years. Helical mode guided waves generating/receiving method, the propagation path and wave fronts shape characteristics are studied. An FE model is established to study the process of helical mode guided waves in pipeline generated by omini-directional S₀ mode Lamb wave. A two-ring 24-elements electromagnetic acoustic transducers array and its supplementary experiment system is set up. Omini-directional single S₀ modal Lamb wave is excited at the frequency of 170 kHz to produce helical mode guided waves in the pipeline. The experiment is conducted to study the propagation characteristics of helical mode guided wave in circumference of the excitation source and the pipe. The simulation and experimental results show that the helical guided wave in pipeline is essentially the propagation of Lamb wave on the curved surface. When Lamb wave is generated from a point source in the pipeline, due to the closure of the pipeline, wave fronts continue to cross with each other and form helical propagating guided waves. There are countless helical propagation paths from the source to the receiver. The spiral angles of each order helical mode are not continuous. Helical mode guided waves provide multi-angle incidence and more information of defects, which is of great significance for defects high-resolution detection.

Key words: electromagnetic acoustic transducer, guided wave, helical mode guided wave, lamb wave, non-destructive testing

CLC Number:

O426

ZHOU Jingjie, ZHENG Yang, ZHANG Zongjian, TAN Jidong. Helical Mode Guided Waves in Pipe Observed by Electromagnetic Acoustic Transducer Array[J]. Journal of Mechanical Engineering, 2018, 54(22): 38-46.

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