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铝板结构兰姆波阵列瞬时相位包络成像及补偿*

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范佳伟,李光海,王强.铝板结构兰姆波阵列瞬时相位包络成像及补偿*[J].,2019,38(6):993-998
铝板结构兰姆波阵列瞬时相位包络成像及补偿*
Instantaneous phase envelope imaging and compensation in aluminum plate using array of lamb waves
投稿时间：2019-02-24修订日期：2019-10-31
中文摘要:
针对板结构中多裂纹缺陷的识别和定位问题，提出了瞬时相位全聚焦成像的包络算法，同时提出了一种基于激励信号脉冲时长的波速补偿方法，通过数值仿真验证补偿后的瞬时相位包络全聚焦成像对多缺陷的识别和定位能力。与幅值全聚焦成像相比，可以有效减小噪声、直达波、端面回波引起的虚像，提高缺陷的识别率。与相位全聚焦成像相比，可以实现缺陷处的单峰值聚焦，更便于缺陷的定位。实验结果表明，所提出的波速补偿瞬时相位包络全聚焦成像在 的铝板上对实现了5个缺陷的成像和定位，其定位的平均误差为12.24 mm。
英文摘要:
Aiming at the problem of the identification and location of multi-crack in the plate structure, an envelope algorithm for instantaneous phase total focus imaging is proposed, and a velocity compensation method based on the pulse duration of the excitation signal is proposed. The ability of identifying and locating multi-crack by instantaneous phase envelope total focus imaging after compensation is verified by numerical simulation. Compared with amplitude total focus imaging, it can effectively reduce the virtual image caused by noise, direct wave and end echo, and improve the recognition rate of defects. Compared to phase total focus imaging, the single peak focusing at the defect can be realized, which is more convenient for the defect location. The experimental results show that the proposed instantaneous phase envelope total focus imaging after wave velocity compensation achieves imaging and positioning of five defects on an aluminum plate of 1000 mm × 500 mm × 1 mm, and the average error of location is 12.24 mm.
DOI：10.11684/j.issn.1000-310X.2019.06.012
中文关键词:兰姆波超声阵列瞬时相位包络算法波速补偿全聚焦成像
英文关键词:Lamb waveultrasonic arrayinstantaneous phase envelope algorithmwave velocity compensationtotal focus imaging?
基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）
作者单位E-mail
范佳伟中国特种设备检测研究院872938704@qq.com
李光海中国特种设备检测研究院liguanghai@tsinghua.org.cn
王强中国计量大学qiangwang@cjlu.edu.cn
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