基于1.5维谱估计的输油管道腐蚀超声回波信号分析  

Ultrasonic Echo Signal Analysis of Oil Pipeline Corrosion Based on 1.5-D Spectrum Estimation

作　　者：唐建[1] 焦向东[2] 戴波[1] 丁学鹏 TANG Jian;JIAO Xiangdong;DAI Bo;DING Xuepeng(School of Information Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;Beijing Higher Institution Engineering Research Center of Energy Engineering Advanced Joining Technology,Beijing Institute of Petrochemical Technology,Beijing 102617,China;Beijing Hua Ju Architectural Planning and Design Institute Co.Ltd.,Beijing 100013,China)

机构地区：[1]北京石油化工学院信息工程学院,北京102617 [2]北京石油化工学院能源工程先进连接技术北京市高等学校工程研究中心,北京102617 [3]北京华巨建筑规划设计院有限公司,北京100013

出　　处：《华南理工大学学报（自然科学版）》2019年第4期120-126,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61702040)~~

摘　　要：针对以快速傅里叶变换为代表的常用二阶统计量在处理输油管道腐蚀超声回波信号时经常出现大量误差的问题,详细研究了管道超声回波信号的形成原理,并运用波动理论对回波信号进行特征分析,提出了基于1.5维谱估计的非最小相位系统与非高斯信号处理方法,并对管壁正常位置、出现内壁腐蚀和外壁腐蚀位置分别进行了逐点扫描检测及超声回波信号分析,同时给出了一种特殊的管壁腐蚀临界位置回波信号处理方法.单点检测和多点连续检测实验结果表明,1.5维谱估计算法分析输油管道腐蚀超声回波信号时,能够有效克服快速傅里叶变换算法的弊端,获取的壁厚相对误差在2%以内,C扫描图像能够清晰地显示管道的腐蚀情况,满足输油管道腐蚀剩余壁厚的检测要求.The frequently used second-order statistics represented by fast Fourier transform often cause many errors in processing the ultrasonic echo signals of pipeline corrosion. To solve the problem, the formation principle of the pipeline ultrasonic echo signal was studied, and the characteristics of the echo signal were analyzed with the wave theory. A processing method of non-minimum phase system and non-Gaussian signal based on 1.5-D spectrum estimation was proposed. Scanning detection and ultrasonic echo signal analysis were carried out for the normal location of pipe wall, the location of inner wall corrosion and outer wall corrosion respectively. And a special method of echo signal processing for the critical location of corrosion on pipe wall was given. Experimental results of single-point detection and multi-point continuous detection show that 1.5-D spectrum estimation algorithm can effectively overcome the shortcomings of fast Fourier transform algorithm when analyzing the ultrasonic echo signal of the oil pipeline corrosion.The relative error of wall thickness obtained is less than 2%. C-scan image can clearly show pipeline corrosion, which meets the detection requirements of the residual wall thickness of the oil pipeline corrosion.

关 键 词：管道腐蚀 超声回波信号 1.5维谱估计 快速傅里叶变换 

分 类 号：TE973.6[石油与天然气工程—石油机械设备]