Nonlinear response analysis of marine risers

Abstract A frequency domain iterative procedure method is presented for the determination of nonlinear dynamic response of marine risers to both regular and random waves. In the dynamic response analysis, the effect of the relative velocity squared drag term, the long-term drift oscillation and the instantaneous motion of the top vessel and the current velocity are duly considered. The frequency domain iterative method is shown to be much more efficient than the time integration method and can adequately consider all the nonlinearities mentioned above.