摘要
为了自主开发基于声发射检测原理的管道气体泄漏位置定位系统,研制了基于四通道声发射检测系统的管道气体泄漏模拟实验装置;在测定声波沿管壁传播速度基础上开展了管道气体泄漏检测实验,通过改变声发射传感器与泄漏孔的在管道壁面的相对位置来模拟泄漏孔位置的变化;采用小波去噪和滑动平均滤波方法对所采集的泄漏信号进行了处理,利用互相关算法求取了各传感器之间的延迟时间,进而基于时间差提出了泄漏孔的定位算法;实验结果表明模拟管道上泄漏孔的定位结果相对误差低于4.0%,该系统对泄漏位置的定位精度满足行业标准和国家标准的要求;通过优化设计声发射信号的采样频率、管道材质、管道壁厚和传感器端面面积等能够进一步提高定位的准确度。
To develop the pipeline gas-leakage location equipment based on the principle of acoustic emission detection,apipeline gas-leakage experimental apparatus with four channels was developed.Based on the measurement of the propagation velocity of sound wave along the pipe wall,the gas-leakage detection experiment was carried out.Different gas-leakage locations were simulated by changing the relative position of the acoustic emission sensors and the leakage hole on the pipe wall.The Wavelet de-noising and moving average filtering approaches were adopted to process the sampled leakage signals,and the delay time between sensors was calculated through the cross-correlation algorithm.Then a location algorithm based on the time differences between sensors for the gas-leakage hole was proposed.It has been shown by the experimental results that the relative error of the location of the leakage hole on the simulated pipeline is less than 4.0%,and the positioning accuracy of the system to the leakage position meets the requirements of the industry standards and national standards.The accuracy of positioning can be further improved by optimizing the sampling frequency of the acoustic emission signals,pipe material,pipe wall thickness and face area of the sensor.
作者
徐源
邢兰昌
张树立
Xu Yuan;Xing Lanchang;Zhang Shuli(College of Control Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China)
出处
《计算机测量与控制》
2020年第4期36-40,共5页
Computer Measurement &Control
基金
国家自然科学基金项目(51306212)
山东省自然科学基金项目(ZR2019MEE095)
中国石油科技创新基金项目(2018D-5007-0214)
山东省重点研发计划项目(2017GGX40109)
中央高校基本科研业务费专项资金项目(16CX05021A)。
关键词
声发射
气体泄漏检测
定位方法
小波去噪
acoustic emission
gas leakage detection
location method
wavelet de-noising
