激光超声缺陷统计特征神经网络识别技术研究

[应用激光]    2017 第 6期
作 者 | 郭华玲; 秦峰; 郑宾; 王余敬  
标 签 | 统计特征   缺陷识别   神经网络   激光超声   statistic features   flaw identification   neural network   laser ultrasonic  

摘 要 | 针对激光超声检测过程中, 缺陷的分类、定位及特征难以识别的问题, 根据激光超声遇到不同裂纹呈规律性变化的特点, 采用神经网络对在激光超声检测中出现的缺陷特征进行统计识别。对采集到的激光超声信号归一化和规范化后, 首先计算每个信号的均值、均方根值、峰值、峭度等十个统计特征, 并将这些特征组合成一个等长的特征向量, 然后采用径向基(RBF)神经网络识别。经过计算发现总的识别正确率为95%, 部分类型的缺陷识别可以达到100%, 较低的识别正确率也在80%以上。实验结果表明, 该方法能精确、高效地识别裂纹缺陷且对环境的适应能力比较好, 有助于实现对裂纹的定量检测。

Abstract | In the process of laser ultrasonic inspection, the problems of defect classification, location and characteristics of defects are difficult to be identified. According to the characteristics of laser ultrasound to meet different crack show regular change, the neural network is used to perform statistical identification of the defect characteristics in laser ultrasonic testing. The laser ultrasonic signals were collected after normalization and standardization, it calculated the mean value, root mean square value, peak and kurtosis characteristics of ten, and combined these statistic features into an even-length feature vector, Then by using radial basis (RBF) neural network identification. After calculation, the total recognition accuracy is 95%, some types of defects can reach 100%, and the lower recognition accuracy is more than 80%. The experimental results show that the method can accurately and efficiently identify crack defects and better adaptability to the environment, it is helpful to realize quantitative detection of cracks.

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