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| 基于光纤光栅传感器的平面声发射检测与定位 |
| Plane Acoustic Emission Detection and Location Based on Fiber Bragg Grating Sensor Network |
| 投稿时间：2024-01-11 修订日期：2024-03-13 |
| DOI： |
| 中文关键词: 声发射 光纤光栅阵列 撞击定位 小波分析 传感器网络 |
| 英文关键词:acoustic emission fiber bragg grating array impact localization wavelet analysis sensor networks |
| 基金项目:国家自然科学基金项目（62205040, 51874064） |
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| 中文摘要: |
| 无损检测中使用的声发射主要是通过分析机械结构中传播的弹性波，利用生成的声波携带信息来确定结构的完整性。本文提出利用正交光纤光栅传感器网络及其对称三角形布置应用于声发射定位的方法，有效减少由光纤光栅轴和声波传播方向之间的角度造成的误差。该方法基于小波变换，利用声发射源形成的Lamb波中不同频率波到达的相对时间差来求解声发射信号，并采用建立的椭圆算法实现对声发射源的定位，实验最终得到平均误差为2.95cm。本文还探究了声发射源距离对传感器接收信号的影响。该研究对仪器的损伤及缺陷定位有较大意义。 |
| 英文摘要: |
| The acoustic emission used in non-destructive testing is mainly based on the analysis of elastic waves propagating in the mechanical structure, and the resulting acoustic wave carrying information is used to determine the integrity of the structure. In this paper, we propose a method to apply the orthogonal FBG sensor network and its symmetrical triangle arrangement to the acoustic emission positioning, which effectively reduces the error caused by the angle between the FBG axis and the direction of sound wave propagation. Based on the wavelet transform, the relative time difference between the arrival of different frequency waves in the Lamb wave formed by the AE source is used to solve the AE signal, and the established ellipse algorithm is used to locate the AE source, and the finally obtained by the experiment with an average error of 2.95 cm. This paper also explores the influence of the distance from the acoustic emission source on the signal received by the sensor. This research is of great significance for the damage and defect localization of the instrument. |
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