电磁声发射信号的压缩与重构处理

发布时间：2018-05-09 19:42

本文选题：电磁声发射 + 无损检测　；参考：《电工技术学报》2017年09期

【摘要】：电磁声发射是一种新型的无损检测技术,其通过对金属构件进行电磁加载,在缺陷处产生声发射信号,根据信号特征对金属构件进行缺陷检测。针对该技术在测定缺陷位置和类型时连续多次加载而产生的大量数据问题,引入信号的压缩感知理论,基于正交匹配追踪算法分别对两种不同类型的声发射信号和电磁声发射信号进行压缩重构,选取不同的测量值,研究其对信号重构效率的影响,从波形和频谱两方面分析重构效果。实验结果表明:压缩感知理论能够达到压缩电磁声发射信号的目的,并且测量值和重构误差之间呈指数衰减关系,与重构时间呈线性增长关系,综合考虑压缩重构的各方面因素,当测量值取8~10倍的信号稀疏度时,电磁声发射信号能够获得较高的重构效率。
[Abstract]:Electromagnetic acoustic emission (EAE) is a new kind of nondestructive testing technology, which produces acoustic emission signals at defects by electromagnetic loading on metal components, and detects defects of metal components according to the characteristics of the signals. In order to solve the problem of large amount of data produced by the technique when measuring the location and type of defects, the theory of signal compression sensing is introduced. Two different types of acoustic emission signal and electromagnetic acoustic emission signal are compressed and reconstructed based on orthogonal matching tracing algorithm. Different measurement values are selected to study the effect on signal reconstruction efficiency. The reconstruction effect is analyzed from two aspects: waveform and spectrum. The experimental results show that the compression sensing theory can achieve the purpose of compression electromagnetic acoustic emission signal, and the relationship between the measured value and the reconstruction error is exponential, and the relationship between the measurement value and the reconstruction time increases linearly. Considering the various factors of compression reconstruction, when the measured value is 8 ~ 10 times of the signal sparsity, the electromagnetic acoustic emission signal can obtain a higher reconstruction efficiency.
【作者单位】：河北工业大学电磁场与电器可靠性省部共建重点实验室;天津工业大学电工电能新技术天津市重点实验室;
【基金】：河北省自然科学基金(E2016202260,E2017202055) 天津市自然科学基金(16JCYBJC19000)资助项目
【分类号】：TN911.7

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