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Q235钢拉伸过程声发射能量谱与奇异性指数特征提取

雷经发 邬竞雄 刘涛 张冰琦

雷经发, 邬竞雄, 刘涛, 张冰琦. Q235钢拉伸过程声发射能量谱与奇异性指数特征提取[J]. 机械科学与技术, 2019, 38(12): 1954-1959. doi: 10.13433/j.cnki.1003-8728.20190280
引用本文: 雷经发, 邬竞雄, 刘涛, 张冰琦. Q235钢拉伸过程声发射能量谱与奇异性指数特征提取[J]. 机械科学与技术, 2019, 38(12): 1954-1959. doi: 10.13433/j.cnki.1003-8728.20190280
Lei Jingfa, Wu Jingxiong, Liu Tao, Zhang Bingqi. Feature Extraction of Acoustic Emission Energy Spectrum and Singularity Index in Tensile Process of Q235 Steel[J]. Mechanical Science and Technology for Aerospace Engineering, 2019, 38(12): 1954-1959. doi: 10.13433/j.cnki.1003-8728.20190280
Citation: Lei Jingfa, Wu Jingxiong, Liu Tao, Zhang Bingqi. Feature Extraction of Acoustic Emission Energy Spectrum and Singularity Index in Tensile Process of Q235 Steel[J]. Mechanical Science and Technology for Aerospace Engineering, 2019, 38(12): 1954-1959. doi: 10.13433/j.cnki.1003-8728.20190280

Q235钢拉伸过程声发射能量谱与奇异性指数特征提取

doi: 10.13433/j.cnki.1003-8728.20190280
基金项目: 

国家自然科学基金项目 61871002

安徽高校自然科学研究重点项目 KJ2016A145

过程装备与控制工程四川省高校重点实验室开放基金项目 GK201714

国家自然科学基金项目 51805003

过程装备与控制工程四川省高校重点实验室开放基金项目 GK201613

详细信息
    作者简介:

    雷经发(1978-), 教授, 博士, 研究方向为生物材料测试技术、数字化设计与制造, rain78828@163.com

    通讯作者:

    刘涛, 副教授, 博士, tao.liu@ahjzu.edu.cn

  • 中图分类号: TH114

Feature Extraction of Acoustic Emission Energy Spectrum and Singularity Index in Tensile Process of Q235 Steel

  • 摘要: 为明确试样拉伸损伤过程声发射信号的变化规律,选取Q235钢试样开展轴向拉伸实验,并进行声发射信号的稳定连续采集。通过小波包分解与重构,提取声发射信号的小波包能量谱及信号幅值的奇异性指数特征。结果表明:信号能量在低频段较为集中,低频段中各频段能量占比随频段增加而降低,而高频段中则相反。随着损伤程度增加,高频能量占总能量比例不断减小,低频能量的总能量占比不断增加,奇异性指数不断下降。当拉伸速率增大时,高频能量在各拉伸损伤阶段的总能量占比不断下降,而低频能量占比和奇异性指数均升高。最后结合拉伸断口进行了宏、微观形貌特征分析。
  • 图  1  多分辨率小波包分解结构

    图  2  试样尺寸

    图  3  声发射传感器布置示意图

    图  4  拉伸速率2 mm/min时能量分布

    图  5  三种拉伸速率各损伤阶段的小波包能量占比

    图  6  各拉伸损伤阶段高频能量的总能量占比

    图  7  各拉伸损伤阶段低频能量的总能量占比

    图  8  拉伸速率2 mm/min时弹性阶段和屈服阶段幅值

    图  9  不同损伤阶段的奇异性指数特征曲线

    图  10  拉伸断口宏观形貌

    图  11  三种拉伸速率下的断口微观形貌

    表  1  Q235钢试样元素质量分数

    元素 质量分数/%
    Fe 98.69
    Mn 0.65
    Cr 0.044
    Co 0.081
    P 0.040
    S 0.045
    C 0.22
    Si 0.23
    下载: 导出CSV

    表  2  各频带对应频率范围

    序列 频率范围
    1 (0, f/16)
    2 (f/16, 2f/16)
    3 (2f/16, 3f/16)
    4 (3f/16, 4f/16)
    5 (4f/16, 5f/16)
    6 (5f/16, 6f/16)
    7 (6f/16, 7f/16)
    8 (7f/16, 8f/16)
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-07-24
  • 刊出日期:  2019-12-05

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