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基于高阶Lamb波模态频谱差异系数的腐蚀检测

陈飞宇 卢丙举 曹徐伟 曾亮

陈飞宇, 卢丙举, 曹徐伟, 曾亮. 基于高阶Lamb波模态频谱差异系数的腐蚀检测[J]. 西南交通大学学报, 2023, 58(5): 1162-1170. doi: 10.3969/j.issn.0258-2724.20210864
引用本文: 陈飞宇, 卢丙举, 曹徐伟, 曾亮. 基于高阶Lamb波模态频谱差异系数的腐蚀检测[J]. 西南交通大学学报, 2023, 58(5): 1162-1170. doi: 10.3969/j.issn.0258-2724.20210864
CHEN Feiyu, LU Bingju, CAO Xuwei, ZENG Liang. Corrosion Detection Based on Frequency Spectrum Difference Coefficient of Higher-Order Lamb Modes[J]. Journal of Southwest Jiaotong University, 2023, 58(5): 1162-1170. doi: 10.3969/j.issn.0258-2724.20210864
Citation: CHEN Feiyu, LU Bingju, CAO Xuwei, ZENG Liang. Corrosion Detection Based on Frequency Spectrum Difference Coefficient of Higher-Order Lamb Modes[J]. Journal of Southwest Jiaotong University, 2023, 58(5): 1162-1170. doi: 10.3969/j.issn.0258-2724.20210864

基于高阶Lamb波模态频谱差异系数的腐蚀检测

doi: 10.3969/j.issn.0258-2724.20210864
基金项目: 国家自然科学基金(52375123);中国博士后科学基金(2021M693882)
详细信息
    作者简介:

    陈飞宇(1987—),男,高级工程师,研究方向为无损检测,E-mail:chenfeiyu@mail.tju.edu.cn

    通讯作者:

    曾亮(1985—),男,副教授,研究方向为无损检测与结构健康监测,E-mail:liangzeng@xjtu.edu.cn

  • 中图分类号: TB553

Corrosion Detection Based on Frequency Spectrum Difference Coefficient of Higher-Order Lamb Modes

  • 摘要:

    针对工业设备中大型薄壁结构件的腐蚀检测问题,提出一种基于频谱相干性分析的高阶Lamb波腐蚀损伤检测方法. 首先,利用略高于截止频率的A1模态Lamb波对含腐蚀薄壁结构的不同位置进行激励,并采集各传播路径上的响应信号;随后,采用频散补偿技术消除信号中的频散效果,通过合适的窗函数对信号中的A1模态直达波包进行分离提取,建立其与激励信号的频谱差异系数 (frequency spectrum difference coefficient, FSDC),通过有限元仿真研究该指标对不同宽度、深度腐蚀损伤的敏感性;最后,在含腐蚀铝板上进行实验验证,结合各路径FSDC指标与概率成像算法,对检测区域的腐蚀损伤进行定位与成像. 结果表明:FSDC值在健康状态下为0,而在不同宽度、深度的腐蚀影响下FSDC在0~1;相较于传统层析成像方法,所提出方法具有更好的检测灵敏度和抗干扰能力.

     

  • 图 1  Lamb波在铝板中的频散曲线

    Figure 1.  Dispersion curves for Lamb waves in aluminum plate

    图 2  A1模态群速度频散随板厚变化的演化关系

    Figure 2.  Evolution of group velocity dispersion of A1 mode with plate thickness

    图 3  1.8 mm 铝板中A1模态的频散关系及其一阶泰勒展开

    Figure 3.  Dispersion relationship and first-order Taylor expansion of A1 mode in aluminum plate with a thickness of 1.8 mm

    图 4  包含矩形槽的二维有限元模型(左边界施加1 000 kHz A1模态的振型)

    Figure 4.  Two-dimensional finite element model with a rectangular notch (applying A1 mode of 1 000 kHz to the left boundary)

    图 5  FSDC随矩形槽宽度、深度的演化关系

    Figure 5.  Evolution of FSDC with width and depth of rectangular notch

    图 6  激光-超声系统实验设置

    Figure 6.  Experimental setup for laser–ultrasonic system

    图 7  1.8 mm铝板的扫查示意

    Figure 7.  Layout of inspected aluminum plate with a thickness of 1.8 mm

    图 8  健康路径L15—P10提取的窄带响应信号

    Figure 8.  Extracted narrow-band response signal from intact path L15—P10

    图 9  健康、损伤路径的补偿实验信号

    Figure 9.  Compensated experimental signals of intact and damaged paths

    图 10  实验中所有路径的FSDC值

    Figure 10.  FSDC values for all paths in experiment

    图 11  基于FSDC的概率成像结果

    Figure 11.  Image obtained from probability reconstruction based on FSDC

    图 12  基于ToF的层析成像

    Figure 12.  ToF-based tomographic image

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出版历程
  • 收稿日期:  2021-11-09
  • 修回日期:  2022-02-17
  • 网络出版日期:  2023-09-13
  • 刊出日期:  2022-03-05

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