摘要
提出了一种基于小波熵的波纹管超声无损检测方法,通过对回波信号进行小波熵技术处理和对熵值的不同来判断波纹管压浆相对密实程度。利用有限元进行了理论模拟仿真,研究了声场,通过仿真数据进行熵分析,结果表明,缺陷处的小波熵值较小,且缺陷越大熵值越小。通过实际制作模型并测量,得到了与仿真一致的结果。
We proposed a nondestructive test for corrugated pipe based on wavelet entropy technology. The grouting compactness is estimated by wavelet entropy through processing of the impact echo signals. The sound field propagation in corrugated pipe structure is simulated and analyzed by using finite element method, and the simula tion results demonstrate the complex wave propagation characteristic in this structure, the scattering signals caused by grouting defect are hardly to be distinguished. The collected impact-echo signals are processed by signal process- ing of wavelet entropy. It is found the defect size is directly related to the information entropy. Several modes are constructed and measured, and the results are consistent with simulated prediction.
出处
《压电与声光》
CSCD
北大核心
2014年第6期1025-1029,共5页
Piezoelectrics & Acoustooptics
基金
国家自然科学基金资助项目(11274091,61302124)
河海大学中央高校基本科研业务费基金资助项目(2011B11014)
常州市科技基金资助项目(CJ20120025)
淮安河海研究院开放基金资助项目
关键词
小波熵
无损检测
波纹管压浆
有限元
缺陷
wavelet entropy
nondestructive test
corrugated pipe grouting
finite element
defect
