摘 要：输油管道健康监测系统目的是监测输油管道中存在的泄露情况。传统的输油管道泄漏检测法如负压波诊断法要求有很强的实时性,常因不能及时捕捉到泄漏信号而造成诊断失败,而声发射检测技术作为一种成熟的无损检测方法,可根据泄漏时流体与泄漏孔隙产生的声发射信号判断泄漏,实现对泄漏信号的连续捕捉,在检测原理上有很大的优势。针对传统方法的不足，利用声发射技术对管道泄漏检测进行了试验研究,通过对声发射信号进行时频域分析,实现了对泄漏信号的有效识别。试验结果表明,泄漏发生时的声发射能量主要集中在10-100kHz,随着泄漏距离的增加,在50kHz处的声发射能量将产生较大的衰减,从而验证了应用声发射技术进行输油管道健康检测的可行性。93420

毕业论文关键词: 声发射,输油管道,泄露,健康检测

Abstract：Pipeline health monitoring system is designed to monitor that exist in the pipeline leaks。 Traditional techniques such as negative pressure wave leakage of oil conveying pipeline diagnosis requires a strong real-time performance, often fail to capture the leak signal and result in failure diagnosis, and acoustic emission testing technology as a kind of mature NDT methods, according to the leakage and leakage of pore fluids when leakage acoustic emission signal judgment, realize the continuous leakage signal capture, has a great advantage on the detection principle。 Using acoustic emission technology for pipeline leak detection is researched, based on the acoustic emission signal time and frequency domain analysis, implements the effective recognition of the leakage signal。 Test results show that the leakage at the time of the acoustic emission energy mainly concentrated in the 10~ 100 kHz, with the increase of leakage distance, energy of acoustic emission in 50 kHz  place will produce larger attenuation, to verify the application of acoustic emission technology in pipeline feasibility of health inspection。

Keywords：Acoustic emission, Pipeline, Leak, Health detection

目   录

1。 前言 5

2。声发射技术 5

2。1声发射技术的基本原理 5

2。2声发射技术的特点 6

2。3声发射系统的构成 7

2。4管道健康系统中声发射技术的原理 8

3。管道泄漏声发射检测系统设计 8

3。1管道泄漏的声发射检测结构框图 8

3。2声发射传感器 9

3。2。1声发射传感器的结构及原理 9

3。2。2声发射传感器电路选择 10

3。3声发射前置放大器 10

3。3。1声发射前置放大器的选择 11

3。5数据采集卡 12

3。5。1数据采集卡的选择 12

3。6数据处理 14

3。7管道泄漏声发射源定位 14

4。 管道泄漏声发射检测实验及结果分析 15

4。1实验管道设计 15

4。2泄漏的发生的辨识 16

4。3随传播距离的变化规律 17

结  论 20