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Abstract <p>During the service period, pipelines are prone to various factors causing damages such as&#xa0;holes and cracks. This paper takes 20# steel pipelines as the research object, setting time-domain amplitude, spectral amplitude and power spectral density as quantitative indicators, to study the response characteristics of the longitudinal mode of guided waves to different damages under different excitation frequencies, explore the sensitivity of the longitudinal mode of guided waves to pipeline damages and analyze the applicable excitation frequencies. The results show that the longitudinal mode of the guided wave is most sensitive to circumferential cracks, and has the weakest sensitivity to longitudinal cracks. Therefore, it is not applicable for the detection of longitudinal crack damage. Furthermore, the longitudinal guided wave mode excited at 70 and 90 kHz exhibits high sensitivity to pipeline damage, making it well-suited for its detection. The frequency selection method proposed in this study, which is based on multi-index comparison, shows broad applicability and serves as a valuable reference for the detection of damage in pipeline structures.</p>

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The Propagation Mechanism of Longitudinal Modes of Guided Waves in Pipelines

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Chenhui Su,
  • Pujun Yuan,
  • Yina Wang,
  • Yanling Zhang,
  • Weichao Gao,
  • Liandong Xie,
  • Xiuli Sun,
  • Xiaomei Zhao

摘要

Abstract

During the service period, pipelines are prone to various factors causing damages such as holes and cracks. This paper takes 20# steel pipelines as the research object, setting time-domain amplitude, spectral amplitude and power spectral density as quantitative indicators, to study the response characteristics of the longitudinal mode of guided waves to different damages under different excitation frequencies, explore the sensitivity of the longitudinal mode of guided waves to pipeline damages and analyze the applicable excitation frequencies. The results show that the longitudinal mode of the guided wave is most sensitive to circumferential cracks, and has the weakest sensitivity to longitudinal cracks. Therefore, it is not applicable for the detection of longitudinal crack damage. Furthermore, the longitudinal guided wave mode excited at 70 and 90 kHz exhibits high sensitivity to pipeline damage, making it well-suited for its detection. The frequency selection method proposed in this study, which is based on multi-index comparison, shows broad applicability and serves as a valuable reference for the detection of damage in pipeline structures.