Influence of Boundary Conditions and Internal Fluid Types on Dynamic Characteristics of a Deepwater Riser

Deepwater Steel Catenary Riser (DSCR) is the key structure of oil and gas production system in ocean. To design an optimized DSCR system, dynamic characteristics are analyzed by setting some different boundary condi-tions internal fluid types. The main vibration mode found orthogonal to both mass stiffness according normalization condition mode, then regular function jth order principal Kpj obtained. Under initial conditions, transverse responses represented coordinates under arbitrary excitation Then, a model in-duced axial load reconstructed for comparative study, have great effect on characteristics. effects conditions natural frequency also at last.