Page 129 - 《应用声学》2021年第5期

第 40 卷 第 5 期 李娟娟： 小样本字典学习的兰姆波模态识别方法 773

tions on Ultrasonics, Ferroelectrics, and Frequency Con-
3 结论 trol, 2014, 61(9): 1515–1524.
[9] Ratassepp M, Fan Z, Lasn K. Wave mode extraction
本文分析了基于小样本字典学习的兰姆波模 from multimodal wave signals in an orthotropic composite
态识别原理和实现流程，将 AAA 板频散特性看作 plate[J]. Ultrasonics, 2016, 71: 223–230.
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一个线性时不变系统，激励信号作为系统输入，不同
with defects[J]. IEEE Transactions on Ultrasonics Ferro-
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统输出，建立字典，其中键是模态和距离的组合，值 [11] Gao F, Zeng L, Lin J, et al. Mode separation in frequency-
是走时和小波能量的组合；获取待测兰姆波信号的 wavenumber domain through compressed sensing of far-
field Lamb waves[J]. Measurement Science and Technol-
走时和能量分布，通过查询字典，得到对应的模态和
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