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An analysis of the simulated acoustic emission sources with different propagation distances, types and depths for rail defect detection

机译：分析具有不同传播距离，类型和深度的声发射源，用于铁路缺陷检测

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摘要

Acoustic Emission (AE) technique is an effective nondestructive detecting method, and has a promising application for rail defect detection. So far, little attention has been paid to propagation distances, types, and depths of AE sources, which are important for rail defect detection accurately. This paper presents an experimental study on the simulated AE sources with different propagation distances, types and depths for rail defect detection. Three simulated AE sources with different frequencies are seeded on the cross section of rail, and the depths of AE sources are changed in the vertical direction. After receiving AE signals, wavelet transform and Rayleigh-Lamb equations are utilized to extract time-frequency features and modes. Based on the wavelet transform with corresponding group-velocity curves, the influences of different propagation distances, the features of different source types and the rules of different source depths are examined. It is concluded that the features of AE sources with different propagation distances, types and depths can be obtained by AE technique for rail defect detection. It is very useful to analyze and detect defects in rail defect detection.
机译：声发射（AE）技术是一种有效的无损检测方法，在轨道缺陷检测中具有广阔的应用前景。迄今为止，很少关注自动曝光源的传播距离，类型和深度，这对于准确检测铁轨缺陷至关重要。本文对具有不同传播距离，类型和深度的模拟声发射源进行了实验研究，以检测钢轨缺陷。将三种不同频率的模拟AE源播种到钢轨的横截面上，并且AE源的深度在垂直方向上发生变化。接收到AE信号后，利用小波变换和Rayleigh-Lamb方程来提取时频特征和模式。基于具有相应群速度曲线的小波变换，研究了不同传播距离，不同震源类型特征和不同震源深度规律的影响。结论是，利用AE技术可以得到不同传播距离，类型和深度的声发射源的特征。在钢轨缺陷检测中分析和检测缺陷非常有用。

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  • 来源
    《Applied Acoustics》 |2014年第12期|80-88|共9页
  • 作者

    Xin Zhang; Naizhang Feng; Yan Wang; Yi Shen;

  • 作者单位

    Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;

    Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;

    Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;

    Department of Control Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Acoustic emission; Wavelet transform; Rayleigh-Lamb equations; Rail defect detection;

    机译：声发射;小波变换瑞利-兰姆方程;铁路缺陷检测;

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