基于声发射技术的管道泄漏检测研究
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摘要
通过搭建管道泄漏试验模拟平台,结合声发射(AE)技术,对管道泄漏AE信号的影响因素和初步定位技术进行了分析研究。探讨了传播距离、泄漏孔径、压力与AE信号之间的关系,通过相关分析法实现管道泄漏的定位。结果表明:AE信号频谱幅值随传播距离的增大呈衰减趋势;泄漏信号的频率随泄漏孔径的增大向低频集中,随压力的增大向高频扩展;传感器间距较小时,互相关分析法能够得出理想的定位结果。
Through building apipeline leak test simulation platform,combined with acoustic emission(AE)technology,the influence factors and preliminary location technology on AE signal of pipeline leakage were analyzed.The relationship between the propagation distance,the leakage aperture,the pressure and the AE signal was discussed,and the location of the pipeline leakage was realized by the correlation analysis method.Results showed that the spectrum amplitude of AE signal was decreasing with the increase of propagation distance;the frequency of the leakage signal centralized to the low frequency with the increase of the leakage aperture,and extended to the high frequency with the increase of the pressure;the cross correlation analysis method can obtain the ideal result in the case of the sensor spacing was smaller.
Through building apipeline leak test simulation platform,combined with acoustic emission(AE)technology,the influence factors and preliminary location technology on AE signal of pipeline leakage were analyzed.The relationship between the propagation distance,the leakage aperture,the pressure and the AE signal was discussed,and the location of the pipeline leakage was realized by the correlation analysis method.Results showed that the spectrum amplitude of AE signal was decreasing with the increase of propagation distance;the frequency of the leakage signal centralized to the low frequency with the increase of the leakage aperture,and extended to the high frequency with the increase of the pressure;the cross correlation analysis method can obtain the ideal result in the case of the sensor spacing was smaller.
引文
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[2]毛小虎,郝永梅,严欣明,等.基于离散小波分析的城市燃气管道泄漏检测定位[J].化工设备与管道,2014,51(3):56-60.
[3]张鹏林,桑远,赵志强,等.声发射技术在Q345E钢拉伸损伤破坏中的应用研究[J].甘肃科学学报,2015,27(2):83-87.
[4]于洋,张雯雯,杨平,等.腐蚀声发射信号降噪方法[J].声学学报,2014,39(3):372-379.
[5]庞艳荣,董小平,陈家熠,等.Nacl溶液中304不锈钢腐蚀过程的声发射特[J].材料热处理学报,2015,36(2):214-218.
[6]朱荣华,刚铁.铝合金疲劳裂纹扩展声发射监测[J].焊接学报,2013,34(3):29-32.
[7]曾毅.声发射信号不同界面传播特性的试验研究[D].广西:广西大学,2010.
[8]兰川,蒋中印.声发射技术在输气管道内检测中的应用[J].中国石油和化工标准与质量,2014,34(12):16.
[9]Gao Y,Brennan M J,Joseph P F,et al.A Modal of the Correlation Function of Leak Noise in Buried Plastic Pipes[J].Journal of Sound and Vibration,2004,277:133-148.
[10]吴志敏,周诗崇,江光世.基于小波变换的管道泄漏声发射检测信号处理[J].制造业自动化,2012,6(34):21-23.