摘要
在管道泄漏诊断过程中,负压波信息缺失会导致误判或漏判,采用改进奇异值降噪技术对负压波信号进行预处理,以提高定性评判泄漏的准确性。介绍了奇异值降噪技术的基本原理及其改进方法,并利用信号互相关技术对泄漏点位置进行了定量计算,实现了对液体输送管线的泄漏故障诊断。对室内液体管道在泄漏诊断过程中负压波特征明显和模糊情况下的奇异值降噪结果进行了对比。结果表明,相关分析方法对信息缺失条件下负压波信号拐点识别的准确率较高。该方法能突出强噪声背景下的负压波信号,并且使泄漏点的定位精度提高到1.52%。该研究结果也可用于液体管线小泄漏的诊断分析。
In the pipeline leakage diagnosis, incomplete negative pressure wave will generate false alarm or overlooked leakage alarm. The negative pressure wave signals preprocessed by the improved singularity value decomposition (SVD) noise-reducing method can qualitatively enhance the accuracy of diagnostic results. The basic principles and the improvement method of SVD technique were presented, and the leak point positions were determined quantitatively using signal correlation technology. The leakage faults in liquid delivery pipelines were diagnosed. The experimental leakage data of negative pressure wave with various fuzzy extents were analyzed with these methods. A high precision of leak positioning is up to 1.52 %, and a good way for enhancing the negative pressure wave under high-noise condition was achieved. The results prove that the signal correlation analysis is favorable for diagnosing the pipeline leakage with incomplete information.
出处
《石油大学学报(自然科学版)》
EI
CSCD
北大核心
2004年第5期74-77,81,共5页
Journal of the University of Petroleum,China(Edition of Natural Science)
基金
国家自然科学基金资助项目(50375103)
北京市新星计划资助项目(2003B33)
中国石油天然气集团公司中青年创新基金资助项目(202f70135
202f70128)
霍英东青年教师基金资助项目(91051)
关键词
负压波
管道泄漏
泄漏点
泄漏诊断
液体管道
输送管线
泄漏故障
法能
研究结果
诊断过程
pipeline
leakage detection
leak point positioning
singularity value decomposition
correlation analysis
negative pressure wave signal