Deepwater Steel Catenary Riser (DSCR) is the key structure of oil and gas production system in the ocean. To design an optimized DSCR system, the dynamic characteristics of the DSCR are analyzed by setting some different boundary condi-tions and internal fluid types. The main vibration mode of the DSCR is found orthogonal to both mass and stiffness according to the normalization condition of the main mode, and then the regular mode function and the jth order principal stiffness Kpj are obtained. Under different initial conditions, the transverse responses of DSCR represented by regular coordinates under arbitrary excitation are obtained. Then, a dynamic model in-duced by both axial load and transverse load is reconstructed for comparative study, and the axial load is found to have a great effect on the transverse dynamic characteristics. The effects of internal fluid and boundary conditions on the natural frequency of DSCR are also found at last.
Guo, Lei; Zhu, Zong-Ming; Pan, Zhong-Jian; and Guo, Zhi-Ming
"Influence of Boundary Conditions and Internal Fluid Types on Dynamic Characteristics of a Deepwater Riser,"
Journal of Marine Science and Technology: Vol. 30:
2, Article 3.
Available at: https://jmstt.ntou.edu.tw/journal/vol30/iss2/3