Dynamic and static analysis of a marine riser |
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| Authors: | C L Kirk E U Etok |
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| Institution: | Offshore Structures Group, Cranfield Institute of Technology, Cranfield, Bedford, MK43 0AL, UK;Conoco North Sea Inc., 116 Park Street, London W1 Y 4NN, UK |
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| Abstract: | A frequency domain normal mode solution is presented for the dynamic response of an unbuoyed marine riser subjected to periodic excitation from a surface vessel in the direction of wave propagation. The variable tension beam-column equation is solved in terms of normal modes of free vibration of the riser and the rigid body displacement. Drag forces on the riser are represented by Morison's formula taking account of the velocity of the riser and wave-induced fluid velocity. A periodic solution for the flexural motion of the riser and the bending stress is then obtained by means of an iterative solution of the frequency response function. The drag force induced stresses arising from a linearly varying current are also determined. The results presented compare favourably with those obtained by other methods. |
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