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低孔隙率碳纤维复合材料的时频模型和局部孔隙检测

杨勇 黄蔚 曾祥

杨勇, 黄蔚, 曾祥. 低孔隙率碳纤维复合材料的时频模型和局部孔隙检测[J]. 机械科学与技术, 2019, 38(11): 1797-1804. doi: 10.13433/j.cnki.1003-8728.20190028
引用本文: 杨勇, 黄蔚, 曾祥. 低孔隙率碳纤维复合材料的时频模型和局部孔隙检测[J]. 机械科学与技术, 2019, 38(11): 1797-1804. doi: 10.13433/j.cnki.1003-8728.20190028
Yang Yong, Huang Wei, Zeng Xiang. Time-frequency Modeling and Localized Pores Detection Method of Low-porosity Composites[J]. Mechanical Science and Technology for Aerospace Engineering, 2019, 38(11): 1797-1804. doi: 10.13433/j.cnki.1003-8728.20190028
Citation: Yang Yong, Huang Wei, Zeng Xiang. Time-frequency Modeling and Localized Pores Detection Method of Low-porosity Composites[J]. Mechanical Science and Technology for Aerospace Engineering, 2019, 38(11): 1797-1804. doi: 10.13433/j.cnki.1003-8728.20190028

低孔隙率碳纤维复合材料的时频模型和局部孔隙检测

doi: 10.13433/j.cnki.1003-8728.20190028
详细信息
    作者简介:

    杨勇(1987-), 工程师, 研究方向为航天器结构设计, 272365918@qq.com

    通讯作者:

    曾祥, 工程师, zzjjuu0104@163.com

  • 中图分类号: TB553

Time-frequency Modeling and Localized Pores Detection Method of Low-porosity Composites

  • 摘要: 本文研究了孔隙率不高于1%的低孔隙率碳纤维复合材料(CFRP)的时频模型和局部孔隙检测方法。将现有的超声波在CFRP内传播的频域模型扩展到时频模型,通过仿真验证了共振结构噪声的存在,研究了共振结构噪声和局部孔隙形成的缺陷回波的频率差异。在此基础上,提出应用变分模态分解分离高频随机噪声和共振结构噪声,提取包含缺陷回波的低频成分进行局部孔隙检测。提出能量函数和瞬时增益的概念,以克服由于声波能量随传播距离降低而造成的近表面信号对远表面信号的遮蔽效果。对低孔隙率CFRP试块的实验表明,基于变分模态分解和瞬时增益的方法能够有效抑制噪声干扰、克服遮蔽效应,实现局部孔隙的准确检测。
  • 图  1  多层介质的反射

    图  2  探头发射信号和频谱

    图  3  仿真结果

    图  4  实验设备

    图  5  接收信号和VMD所得成分:波形、频谱、包络谱

    图  6  EMD所得成分

    图  7  试块S1的能量函数和瞬时增益

    图  8  试块S2的能量函数和瞬时增益

    图  9  区域A、B、C的显微照片

    表  1  中心频率分布

    α ω/(2π)/MHz
    ω1/(2π) ω2/(2π) ω3/(2π)
    1 500 31.11 10.98 7.04
    1 750 31.28 11.00 7.08
    2 000 31.39 11.02 7.12
    2 250 31.47 11.03 7.15
    2 500 31.53 11.04 7.18
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-11-06
  • 刊出日期:  2019-11-05

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