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Non-linear dynamic response induced by wave-current for marine risers with guide-frames |
CHANG Yuan-jiang,CHEN Guo-ming,XU Liang-bin
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(College o& Mechanical and Electronic Engineering in China University o& Petroleum,Dongying 257061, Shandong Province,China )
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Abstract: |
Considering the gap-contact condition between guide-frames and the fixed drilling unit riser subjected to wave-turrent loads,the solution method for transient dynamic problem under the nonlinear boundary condition was discussed. By applying the finite element method, the marine riser was modeled as the beam model which was fixed under the seabed mudline at the depth of three meters,simply supported at the lower deck,and its lateral vibration was restricted by guide-frames at different elevation. Using ANSYS software,the gap-contact condition between marine riser and guide-frames was simulated by combination40 element. The non-linear dynamic response of marine riser under one-hundred-year wave-current environmental load was calculated,the displacement-time history of typical nodes and equivalent stress-time history of typical elements were also obtained,and strength check of the riser was then achieved successfully. The results provide refer-ence for design and analysis of the marine risers with guide-frames. |
Key words: riser guide-frames gap-contact boundary nonlinearity direct integration method |
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