作者：宋潮^1,2, 郑宾^1,2, 郭华玲^1,2, 刘辉^1,2, 侯静^1,2

作者单位：1. 中北大学计算机与控制工程学院, 山西 太原 030051;
2. 中北大学电子测试技术重点实验室, 山西 太原 030051

关键词：激光超声;小波包分解;反射波;能量变化率;缺陷深度

摘要：

为提供解决航空发动机原位裂纹的快速检测方法，得到缺陷深度与特征量之间的关系，使用激光器在一系列不同缺陷深度的航空板上激发声表面波，对收集到的信号进行预处理，并提出新的小波包变换能量变化率指标，用于进行缺陷损伤识别。结果表明：反射波信号在S80、S81频带上的小波包能量变化率随缺陷深度的增加呈现增加趋势，增长幅度分别为96.8%、86.3%；而反射回波在S80、S83频带上的小波包能量变化率较为显著，增长幅度分别为23.8%、80.2%。该分析方法为激光超声表征表面缺陷提供新的思路，为今后从能量变化率指标分析裂纹深度奠定基础。

Laser ultrasonic treatment based on wavelet packet energy change rate

SONG Chao^1,2, ZHENG Bin^1,2, GUO Hualing^1,2, LIU Hui^1,2, HOU Jing^1,2

1. Computer Science and Control Engineering, North University of China, Taiyuan 030051, China;
2. National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, China

Abstract: In order to provide a quick detection method for situ crack of aeroengine so as to get the relationship between detect depth and feature quantity, lasers are used on aviation plate with different defect depths to motivate surface acoustic wave, and carry out pre-treatment for collected signals, and provide a new wavelet packet transformation energy change rate index, which is used for defect damage identification. The results show that the change rate of wavelet packet energy of reflected wave signal in the S₈₀ and S₈₁ bands increases along with the defect depth with increasing rate respectively being 96.8% and 86.3%; while the change rate of wavelet packet energy of reflected wave in S₈₀ and S₈₃ bands is significant, with increasing rate respectively being 23.8% and 80.2%. The method provides a new idea for laser ultrasonic surface characteristic defects, which lays a solid foundation for analyzing the crack depth based on energy change rate index in the future.

Keywords: laser ultrasonic;wave packet decomposition;reflected wave;energy rate change;defect depth

2017, 43(11): 12-16  收稿日期: 2017-06-20;收到修改稿日期: 2017-08-03

基金项目: 

作者简介: 宋潮(1991-),女,山西晋城市人,硕士研究生,专业方向为激光超声无损检测技术。

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