Nonlinear Static and Dynamic Analysis of Composite Riser

Abstract

The dynamic response of composite production risers w.r.t periodic and erratic waves was derived in the time domain. The harmonic superposition method is used to model the time series of sea surface elevation, water particle kinematics, and vessel top motion in the context of random sea states. Instantaneous updates to the stiffness matrix account for the intrinsically unpredictable variations in axial tension. Time domain examination of the riser structure takes into account some significant nonlinearities. For a range of tides typical of the deep offshore fields in the Indian Ocean, the bending stresses in the presence of variable axial tension are calculated. Obtaining power spectral density functions helps researchers look for signs of resonance. As a result of their high strength-to-weight ratio, composite risers are highlighted in the research as a potential means of increasing safety margins. In order to provide input for the probabilistic evaluation of riser safety in a harsh ocean environment, we extract the statistical features of the reaction, which are of stochastic nature.