Applications of Fuzzy Lifting Wavelet Packet Transform in MFL Signal Processing
摘 要
漏磁(MFL)检测信号常被多种噪声源污染,极大地降低了漏磁信号中缺陷信号的可检测性。为此提出应用模糊提升小波包解决漏磁信号的噪声抑制问题。对比分析软阈值、硬阈值和模糊阈值三种阈值处理方式下,传统小波包与提升小波包的降噪性能,并应用模糊提升小波包实现了漏磁信号的降噪。仿真结果表明,该方法具有运算速度快,降噪效果好的特点,是一种有效的漏磁检测信号降噪方法。
Abstract
Magnetic flux leakage (MFL) testing signals obtained from oil pipelines are usually contaminated by various sources of noises, and therefore the detectability of defect in MFL data is considerably reduced. The fuzzy lifting wavelet packet was presented and used to solve the problem of noise reduction from the magnetic flux leakage (MFL) inspecting signals. Under the condition of three kind of threshold processing mode: soft-threshold,hard-threshold and fussy-threshold, the de-noising performance of proposed method was compared with traditional wavelet packet. The simulation results showed that the fuzzy lifting wavelet packet de-noising method had the characteristic of fast operational speed and good de-noising effectiveness, so it was a valid on-line processing method of MFL inspecting signal.
中图分类号 TG115.28
所属栏目 科研成果与学术交流
基金项目 河北省自然科学基金资助项目(E2008001258)
收稿日期 2010/8/26
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备注纪凤珠(1982-),男,博士研究生,主要从事漏磁检测技术及理论研究。
引用该论文: JI Feng-Zhu,SUN Shi-Yu,WANG Chang-Long,ZUO Xian-Zhang,WANG Jin. Applications of Fuzzy Lifting Wavelet Packet Transform in MFL Signal Processing[J]. Nondestructive Testing, 2011, 33(5): 22~24
纪凤珠,孙世宇,王长龙,左宪章,王瑾. 模糊提升小波包变换降噪法在漏磁检测信号处理中的应用[J]. 无损检测, 2011, 33(5): 22~24
被引情况:
【1】唐语,郭前岗,周西峰, "基于整数小波变换的机车轮对超声检测数据压缩",无损检测 37, 21-25(2015)
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参考文献
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【2】Ji Fengzhu, Wang Changlong, Shiyu Sun, et al. Application of 3-D FEM in the simulation analysis for MFL signals[J]. Insight,2009,51(1):32-35.
【3】高兵,葛飞.管道漏磁检测系统中自适应滤波器设计[J].无损探伤,2007,31(1):25-27.
【4】韩文花,阙沛文.无缝管道漏磁信号去噪新方法[J].无损检测,2005,27(12):629-631.
【5】Antonini G, Orlandi A. Wavelet packet-based EMI signal processing and source identification[J]. IEEE Trans,2001,EC-43(2):140-148.
【6】Daubechies I, Sweldens W. Factoring Wavelet Transforms into Lifting Steps[J]. Journal of Fourier Analysis and Application,1998,4(3):247-269.
【7】Sweldens W. The Lifting Scheme: A Construction of Second Generation Wavelets[J]. SIAM J Math Anal,1997,29(2):511-546.欢迎网上投稿欢迎订阅欢迎刊登广告
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