Citation

Gao W, Liu Y, li D, Gan W, Chen X. China Saf. Sci. J. 2019; 29(8): 67-72.

Copyright

(Copyright © 2019, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2019.08.011

PMID

unavailable

Abstract

In order to improve the timeliness and accuracy of gas pipeline monitoring, fiber grating technology is used to study the vibration characteristics of the gas pipeline leakage process. Firstly, a gas pipeline experimental platform was built according to the actual working conditions, then the vibration information of pipe walls was collected through FBG sensing system, and the spectrum analysis of vibration signals was performed by using signal processing methods such as Fourier transform and filtering. The results show that the gas pipeline will produce obvious vibration waves when it leaks; the vibration acceleration of pipe walls near the leak hole increases along with the leak, and the increase is positively correlated with the size of the hole and negatively related with the spreading distance along the pipe; it is also found that a vibration wave with a frequency around 350 Hz is generated from the leak, and fiber grating sensing technology can accurately identify the leak point with an accuracy of ±2. 5 m. © 2019 China Safety Science Journal

Language: zh