Feature Extraction of AE Signal in Offshore Platform Tubular Joints Crack Propagation Based on Wavelet Coefficient Energy Theory

Gui Jie Liu; Meng Xu; Shao Feng Zhu; Rui Lin Jiang

doi:10.4028/www.scientific.net/AMR.479-481.1334

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Lathe Modal Parameters’ Identification and Verification Based on the GLOBAL Method
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Sound–Structure Coupling Analysis of Multi-Flexible Plates Enclosure
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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 479-481Feature Extraction of AE Signal in Offshore...

Feature Extraction of AE Signal in Offshore Platform Tubular Joints Crack Propagation Based on Wavelet Coefficient Energy Theory

Abstract:

To identify the fatigue crack propagation of tubular joints in the offshore platform, we applied the wavelet coefficient energy theory to monitor and analyze the acoustic emission(AE) signal of marine structures with typical fatigue crack propagation. Based on typical tubular joints model fracture experiments of the offshore platforms, we successfully extracted the characteristics of AE signals during crack propagation. Further analysis results demonstrated that the elastic wave generated by the crack extension was superimposed by a variety of high frequency signals, and it changed with the evaluation of crack. The variation of wavelet coefficient energy and the change of crack propagation state showed a strong correlation. Thus the characteristics of AE signals can be used to identify different stages of crack propagation accurately, intuitively, and clearly, so as to label the development process of crack.

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Periodical:

Advanced Materials Research (Volumes 479-481)

Pages:

1334-1340

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.479-481.1334

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Online since:

February 2012

Authors:

Gui Jie Liu, Meng Xu, Shao Feng Zhu, Rui Lin Jiang

Keywords:

AE, Crack Propagation, Offshore Platform, Wavelet Coefficient Energy

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