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Indexed by:期刊论文

Date of Publication:2017-02-01

Journal:7th International Conference on Structural Health Monitoring of Intelligent Infrastructure (SHMII)

Included Journals:SCIE、EI、CPCI-S

Volume:20

Issue:2,SI

Page Number:180-190

ISSN No.:1369-4332

Key Words:Brillouin optical time-domain analysis; distributed fiber optic sensor; structural health monitoring; subsea pipeline; upheaval buckling

Abstract:A method for monitoring the upheaval buckling of subsea buried pipelines by distributed optical fiber sensors is introduced. The proposed method originates from the fact that the bucked pipe has the deterministic patterns of the bending-induced and axial force-induced strains, which can be used to identify the pre- and post-buckling states of the pipe. The challenge for utilizing these features is that the distributed fiber optic sensor can only measure the compound strain created by both bending and axial compression. A monitoring scheme by placing three sensors with 2 pi / 3 space around the circumference of the pipeline was proposed in this article. An approach was presented to extract the bending-induced and axial force-induced strains from the longitudinal strains measured by the distributed fiber optic sensors. The experimental programs were then designed to investigate the feasibility of the proposed method. It is demonstrated that the proposed method is possible to detect the occurrence of buckling in the pipe. However, further research is necessary in order to examine the efficiency of the proposed approach under the complex loading patterns at subsea levels.