| 天然气管道泄漏音波序列局部投影降噪研究 |
| |
| 引用本文： | 叶迎春,张来斌,梁伟.天然气管道泄漏音波序列局部投影降噪研究[J].中国石油大学学报(自然科学版),2010,34(1). |
| |
| 作者姓名： | 叶迎春 张来斌 梁伟 |
| |
| 作者单位： | 中国石油大学机电工程学院,北京,102249 |
| |
| 基金项目： | 国家"863"项目，北京市教育委员会共建项目，教育部新世纪优秀人才支持计划项目 |
| |
| 摘 要： | 天然气管道泄漏检测采集的音波序列中含有大量噪声,在进行泄漏特征提取之前必须进行降噪处理.通过频率分布和混沌性分析,引入泄漏音波序列局部投影方法.该方法寻找相空间重构过程中由噪声形成的子空间,通过抑制该空间中的噪声投影来达到降噪的目的.仿真信号测量和现场试验表明:局部投影方法适用于泄漏音波序列降噪,可以解决降噪过程中频率混叠和混沌性带来的问题;与其他方法相比,局部投影方法在时域统计指标、频域和功率谱分析、自相关函数分析以及提高信噪比等方面明显得到改善,大大提高了泄漏特征提取的准确率.
|
| 关 键 词： | 音波序列 混沌性 局部投影降噪 天然气管道 泄漏 |
Study of noise reduction of natural gas pipeline leakage acoustic series by local projection |
| |
| YE Ying-chun,ZHANG Lai-bin,LIANG Wei.Study of noise reduction of natural gas pipeline leakage acoustic series by local projection[J].Journal of China University of Petroleum,2010,34(1). |
| |
| Authors: | YE Ying-chun ZHANG Lai-bin LIANG Wei |
| |
| Institution: | YE Ying-chun,ZHANG Lai-bin,LIANG Wei(Faculty of Mechanical , Electronic Engineering in China University of Petroleum,Beijing 102249,China) |
| |
| Abstract: | The acoustic series collected from natural gas pipeline leakage detection includes much noise,and thus,the noise must be reduced before extracting leakage characteristic index. The noise reduction method of local projection for leakage acoustic series was introduced by analyzing frequency distribution and chaos characteristics. The subspace formed by noise was given in the phase space reconstruction process in this method,and through inhibiting noise projection in that space,the noise was reduced. Simulatio... |
| |
| Keywords: | acoustic series chaos characteristics local projection natural gas pipeline leakage |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
