基于模糊小波包的超声导波检测信号降噪研究

在管道超声导波检测中,缺陷同波信号的质量是实现管道缺陷识别和特征提取的基础.针对软、硬阈值处理方法的不足,给出了一种模糊阈值小波包降噪方法.应用该方法对包含高斯白噪声的模拟信号和实验采集到的超声导波检测信号进行了降噪处理,并且与小波全局阈值、小波包默认阈值降噪效果进行了对比分析.实验结果表明,模糊小波包降噪法能有效降低...

Study on noise reduction for ultrasonic guided wave detection signal based on fuzzy wavelet packet

In the process of the defect detection in pipelines with ultrasonic guided wave,the quality of defect echo signals is the foundation for the pipeline defect identification and feature extraction.A de-noising method of wavelet packet based on fuzzy threshold is presented for the limitation of soft and hard thresholds.The method is applied to reduce Gauss white noise of the simulated signal.And also,the ultrasonic guided wave pipeline detection signal contaminated by noise is de-noised by this method.Moreover...