Air-coupled Lame wave imaging detection for thin plate damage based on continuous wavelet transform
摘 要
针对铝板采用空气耦合超声探头激励出A0模式的兰姆波,在含有损伤的铝板同一侧激发和接收并以步进1 mm进行扫查试验。对扫查接收信号进行连续小波变换,提取400 kHz频率下的小波系数包络信号,识别了激励兰姆波的模态。最后利用不同扫描点处接收信号的连续小波变换系数包络信号进行幅值包络成像。结果显示,基于连续小波变换得到的特定频率处幅值包络信号信噪比较好,且成像结果具有较高的聚焦性。
Abstract
In the test, A0 mode Lame waves were excited by an air-coupled ultrasonic probe on the aluminum plate. Lame waves were excited and received on the same side of the aluminum plate containing damage, and defects were scanned with a step of 1mm. The wavelet coefficient envelope signal at 400 kHz frequency is extracted by continuous wavelet transform for the received signal, and the mode of excited Lame wave is identified. Furthermore, the amplitude envelope imaging is carried out using the continuous wavelet transform coefficient envelope signals received at different scanning points. The results show that the amplitude envelope signal noise at a specific frequency obtained by continuous wavelet transform is better and the imaging results have higher focusing.
中图分类号 TB559 TG115.28 DOI 10.11973/wsjc201911012
所属栏目 试验研究
基金项目
收稿日期 2019/1/30
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备注常俊杰(1964-),女,博士,副教授,主要从事超声无损检测的应用技术研究及检测设备的研发等工作
引用该论文: WAN Taolei,CHANG Junjie. Air-coupled Lame wave imaging detection for thin plate damage based on continuous wavelet transform[J]. Nondestructive Testing, 2019, 41(11): 43~47
万陶磊,常俊杰. 基于连续小波变换的薄板损伤空气耦合兰姆波成像检测[J]. 无损检测, 2019, 41(11): 43~47
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参考文献
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【2】PAUL S K, RAY A. Influence of inclusion characteristics on the formability and toughness properties of a hot-rolled deep-drawing quality steel[J]. Journal of Materials Engineering and Performance, 1997, 6(1): 27-34.
【3】MANNOT J, HERITIER B, COGNE J Y. Relationship of melting practice, inclusion type, and size with fatigue resistance of bearing steels [J]. ASTM Spec. Tech. Publ., 1988, 9(8): 149-165.
【4】常俊杰, 卢超, 小仓幸夫. 非接触空气耦合超声检测原理及应用研究[J]. 无损探伤, 2013, 37(4): 6-11.
【5】常俊杰, 卢超, 川嶋紘一郎. 非接触空气耦合超声波的材料无损评价与检测[J]. 浙江理工大学学报(自然科学版), 2015,33(4): 532-536, 542.
【6】常俊杰,魏强,卢超.非接触空气耦合超声波钢板探伤的应用研究[J].浙江理工大学学报(自然科学版),2015,33(6):829-834.
【7】常俊杰, 杨凯, 李光亚, 等. 空耦超声波技术用于锂离子电池缺陷检测[J]. 电池, 2017, 47(5): 315-317.
【8】饶璐雅, 陈果, 卢超, 等. 碳纤维复合材料层板冲击损伤的空气耦合兰姆波成像检测[J]. 宇航材料工艺, 2017, 47(5): 69-74.
【9】刘菲菲, 刘松平, 郭恩明. 复合材料层压结构冲击损伤超声成像评估[J].无损检测,2014,36(11):2-5, 41.
【10】刘松平, 傅天航, 刘菲菲, 等. 复合材料冲击损伤超声回波特性及其成像检测[J]. 航空制造技术, 2011(15): 82-85.
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