Subsea jumper damage detection based on fractal analysis and modal characteristics
Volume
75
Issue number
2
Article number
75201
Submitted
21.08.2023.
Accepted
08.12.2023.
Authors
Yan Li1, XingKun Zhou1,2*, WenHua Li1,2
1 Department of Marine Engineering, Dalian Maritime University, 116026 Dalian, P.R China
2 National Center for International Research of Subsea Engineering Technology and Equipment, Dalian Maritime University, Dalian, P.R China
Corresponding author email
Abstract
Subsea jumpers play a critical role in subsea oil and gas production. Structural damage such as cracks is inevitable in subsea jumpers due to the harsh marine environment (internal fluid flow corrosion, high temperature and pressure, etc.). However, the current research on damage detection and evaluation of subsea jumpers is limited, particularly in cases of slight damage. This study thus proposes a method to identify cracks in subsea jumpers based on the modal characteristics and fractal theory. The accuracy of the method is verified by comparing the finite element simulation method via APDL and the analytical method via MATLAB. In addition, the sensitivity of the method to noise is investigated. The results indicate that the method accurately identifies cracks (single and multiple) with a minimum depth of 0.2 mm in various locations on subsea jumpers. This study may hold significant reference value for improving the safety and reliability of subsea jumpers.
Keywords
Subsea jumper, damage detection, small crack, modal characteristics, fractal theory