毕业论文（设计）金属管道的瞬变电磁技术研究.doc

金属管道的瞬变电磁技术研究
摘要:管道运输是五大运输方式之一,十分重要,而金属管道运输又被广泛运用于原油、天然气、液化气等重要能源的运输,因此保证金属管道的安全关乎到经济和民生的稳定。在运输过程中,大部分金属管道埋于地下,常年受泥土中化学物质的腐蚀和暗流的冲刷,容易产生腐蚀缺陷,及时的检测出金属管道的缺陷能够挽回不同程度的损失。而瞬变电磁检测可以在不需要现场开挖的情况下对埋地金属管道做出腐蚀缺陷的检测。
本文以瞬变电磁检测理论为基础,通过改变发射和接收线圈的匝数,观察对缺陷检测的灵敏度,在不同匝数下,分别对试样金属管进行等距分点检测,利用软件描绘出归一化感应电动势与检测点位置的曲线图。
从本实验可以看出,能用于分析的数据大致处于中期,即时窗在10左右的位置,因为早期受到一次场的影响不能用于比较,后期衰减过分也不利于分析,而且“烟圈效应”从另一个角度也能证明最佳时期在中期,因为早期信号反应浅部信息、晚期信号反应深部信息,所以中期信号反应内部中间信息,综上所述最利于分析部分在中期;线圈匝数越高,对关断时间的影响越大,受到影响的数据越多,能使用的时窗越靠后,不利于分析。因此使用瞬变电磁检测技术可以快速、有效地实现埋地金属管道的无开挖检测和安全评定,具有重要的参考价值。
关键字:金属管道腐蚀缺陷非开挖检测技术瞬变电磁检测
指导老师签名:
The study on transient ic method testing of metal pipelines
Student name : zhong lingchong Class: 110813
Supervisor: chen bingya
Abstract:Pipeline transport is one of the five major modes of transportation,it is very important,and metal pipeline transport was widely used in transporting crude oil,natural gas,liquefied petroleum gas,and other important energy,thus ensure the security of metal pipe about the stability of the economy and the people’s livelihood.
In the process of transportation,most of the metal pipelines buried underground,a perennial soil chemical corrosion and undercurrent of scour,prone to corrosion detects,and timely detect the defects in metal pipe different degree of damage could be transient ic detection can defects corrosion detection under the condition of don’t need to excavating the buried metal pipeline.
In this paper,based on the theory of transient ic detection,under different heights and different frequencies,we detect the sample tube that was divided into isometric point respectively,we using matlab software to analyze three kinds of data,it is concluded that different graphs,and we analysis the influence of different excitation spectrum parameters on the detection signal,we analysis the influence of different parameters on the height of detection experiment shows that using the transient ic detection technology can achieve the buried me