The Location of Acoustic Emission Source of Pipeline Leakage Based on EMD and Wavelet Transform
-
摘要: 由于管道泄漏声发射检测信号中含有大量噪声, 因此在一定程度上影响了泄漏源定位的精准度。针对这一问题, 首先将管道泄漏声发射信号进行经验模态分解(EMD), 然后对其中高频分量进行小波分解去噪, 保留有用的信号特征, 最后对有效分量进行重构得到去噪后的管道泄漏声发射信号, 并通过相关分析进行定位。结果表明: 相比单一的信号处理方法, 采用EMD和小波分解相结合的方法对声发射信号进行去噪重构, 并进行相关分析计算,得到的泄漏源定位更精确。Abstract: The enormous noise existing in the pipeline leakage acoustic emission detection would greatly influence the precision of localization of leakage sources. Aiming at this problem, this paper firstly used EMD to decompose the pipeline leakage acoustic emission signal. Then, the high frequency was de-noised by wavelet analysis in order to retain the useful signal. Finally, the useful signal was selected to reconstruct the acoustic emission signal and the leakage sources location was determined by correlation analysis. The experimental results showed that, compared with the single processing method, the location accuracy of the leakage detection was increased by using EMD and wavelet analysis.
-
-
[1] 杨明纬. 声发射检测［M］. 北京: 机械工业出版社, 2005: 1-50. [2] ALLEN T G. 声发射技术五十年(1961～2011)［J］. 无损检测, 2012, 34(4): 50-59. [3] 焦敬品,何存富,吴斌, 等. 管道声发射泄漏检测技术研究进展［J］. 无损检测, 2003, 25(10): 519-523. [4] 雷玉兰. 新型无损检测技术在压力管道在线检测中的应用研究［J］. 高新技术, 2012(23): 1. [5] 王朝晖,张来斌,辛若家,等. 声发射技术在管道泄漏检测中的应用［J］. 中国石油大学学报(自然科学版), 2007, 31(5): 87-90. [6] 贾乐乐,杨国安,沈江,等. 金属管直径对声发射波传播的影响［J］. 无损检测, 2013, 35(6): 1-10. [7] 阳能军,汤伟,龙宪海,等. EMD及其在声发射检测中的应用研究［J］. 振动与冲击, 2008, 27(s): 65-67. [8] 孙立瑛,李一博,曲志刚,等. 基于EMD的声发射管道泄漏检测研究［J］. 压电与声光, 2008, 30(2): 239-245. [9] 谷小红,侯迪波,周泽魁. 声发射与EMD相结合的埋地水管泄漏定位检测［J］. 浙江大学学报(工学版), 2006, 40(7): 1105-1108. [10] 张平,施克仁,耿荣生,等. 小波变换在声发射检测中的应用［J］. 无损检测, 2002, 24(10): 436-442. [11] 熊亚飞,李强,叶辉. Q345R钢焊接缺陷声发射信号的时频分析［J］. 无损检测, 2014, 36(9): 19-24. [12] MUNOZ N, ANDRES, HASHEMI, et al. Continuous wavelet transform analysis of acoustic emission signals［J］. Proceedings of the International Modal Analysis Conference-IMAC, 1999, 1(1): 99-102. [13] 龚斌,金志浩,齐辉. 无须测量声速的声发射源定位方法研究［J］. 仪器仪表学报, 2007, 28(1): 185-188. [14] 陈玉华,刘时风,耿荣生,等. 声发射信号的谱分析和相关分析［J］. 无损检测, 2002, 24(9): 359-399.
计量
- 文章访问数: 8
- HTML全文浏览量: 2
- PDF下载量: 8
下载:
