大口径天然气管道音波信号的降噪方法  

Noise Reduction for Large-Diameter Gas Pipeline Acoustic Signals

作　　者：梁伟[1] 张来斌[1] 郭磊 

机构地区：[1]中国石油大学(北京)机械与储运工程学院,北京102249 [2]中石油昆仑燃气公司,北京100007

出　　处：《振动．测试与诊断》2012年第6期970-974,1037,共5页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(编号:51005247);国家高技术研究发展计划("八六三"计划)资助项目(编号:2008AA06Z209);北京市科技新星计划资助项目(编号:2010B068);北京市教委共建项目

摘　　要：针对大口径天然气管道运行的非线性系统的特点,利用局部投影降噪方法对高含噪声的音波信号进行降噪处理。介绍了局部投影降噪方法的理论基础、算法步骤和数学模型,对该算法中的关键参数嵌入维数和时间延迟分别进行了说明,并用相应的方法进行求解计算。对现场3种不同工况的原始音波数据进行降噪分析,结果显示信噪比提高了20.7～38.2dB,说明了局部投影降噪方法对音波信号降噪的有效性和实用性,能实现噪声与特征信号的正确分离。According to the characteristics of nonlinear system when large-diameter gas pipeline runs,local-projective noise reduction method is used to reduce the strong background noises mixed in acoustic signals.The theoretical basis,the algorithm steps as well as the mathematical model of local-projective noise reduction method are introduced.Furthermore,the key parameters of algorithm,embedding dimension and delay time,are described respectively and calculated by corresponding methods.The original acoustic signals of three different field operation conditions are de-noised,and the results show that the signal-to-noise ratio is increased by 20.7 ～ 38.2 dB,which illustrates the effective and practical local-projective noise reduction method can realize correct separation of acoustic feature signals from noises.

关 键 词：大口径 天然气管道 泄漏检测 音波 局部投影降噪法 

分 类 号：TE973.6[石油与天然气工程—石油机械设备]