Acceleration Response Analysis of the SCR rigid body swing under wave and x-direction motion

Abstract

Under the action of waves or current, the rigid body oscillation from the suspension point to touch down point(TDP) is a real problem of steel catenary riser(SCR). The influence of the phenomenon on the acceleration in cross flow of riser is not to be ignored. On the basis of the slightness beam with large deformation model coupling the wave force model and the rigid body rotation model, the impact of rigid body swing on the cross flow of structure’s acceleration is researched under the wave action and x direction motion. Numerical calculation manifests that the maximum impact of rigid body swing on structure acceleration is approximately 20%. Rigid body rotation is differ from the wave action and the top motion reducing with the depth of the water. Rigid body rotation increases with the radius vector S. The relative reduction calculation shows that between 10th and 140th, the structural response decreased by about 30%, and between 140th-seabed, by about 15%. The normalized calculation results from each node show that between 10th and 140th, the structural response decreases with the increase of the x-direction load frequency or the decrease of amplitude. Between the 140th-seabed, the structural response is increasing. It is expected that some rational and pragmatic suggestions can be provided for the computation of transverse flow of SCR. With the help from the team, the work of the article can be carried out. It is desired that, this article will help the team.