华中科技大学学报：自然科学版2012，Vol.40Issue(8)：39-43,5.
改进的子空间匹配追踪导波信号识别方法
Guided wave signal recognition by modified subspace matching pursuit method
摘要
Abstract
The modified subspace matching pursuit（MSMP） was proposed to simplify the complex computation of the subspace matching pursuit.The differential evolution algorithm（DEA） was applied to the MSMP by choosing chirplet function as match atoms.An aluminum pipe with holes was tested by 29 kHz t（0,1） guided wave and the measured signal was decomposed and reconstructed by MSMP.The quality of the processed signal was improved obviously,and the defect echo can be identified easily.The matched result was compared to the matched result from matching pursuit（MP） with DEA and orthogonal matching pursuit（OMP） with evolutionary programming using mutations based on the t probability distribution（tEP）.The matched parameters get by MSMP,MP with DEA,and OMP with tEP were compared and analyzed.It is found that the quality of the matched waveform from MSMP and MP are better than that from OMP.The defect locations and the center frequency of the excitation signal are more exactly get from MSMP than from MP.The computation time by MSMP is shorter than the one by MP and OMP.Therefore,MSMP is a useful signal recognition and defect location approach for pipes guided wave non-destructive testing.关键词
导波/信号识别/微分进化算法/改进子空间匹配追踪/正交匹配追踪Key words
guided wave/signal recognition/differential evolution algorithm/modified subspace matching pursuit/orthogonal matching pursuit分类
金属材料引用本文复制引用
申传俊,王悦民,徐海成,孙丰瑞..改进的子空间匹配追踪导波信号识别方法[J].华中科技大学学报：自然科学版,2012,40(8):39-43,5.基金项目
中国博士后科学基金资助项目 （）
总装预研基金资助项目 （）
