Dynamic Analysis of Underwater Cables

by Alain Lo, Research Asst.; Dept. of Civ. Engrg., Oregon State Univ., Corvallis, Oreg. 97331,
John W. Leonard, (A.M.ASCE), Prof.; Dept. of Civ. Engrg., Oregon State Univ., Corvallis, Oreg. 97331,

Serial Information: Journal of the Engineering Mechanics Division, 1982, Vol. 108, Issue 4, Pg. 605-621

Document Type: Journal Paper

Abstract: A general approach is presented for the finite element analysis of cable systems under hydrodynamic influences. The drag and inertia effects of fluid are included using a Morrison type equation. Curved cable elements are used to improve the geometric approximation of cable segements so that less elements are required than if straight elements are used. The formulation can also handle geometric and material nonlinearities and the effects of any discrete elements can be lumped at nodal points. The principle of virtual work is used to formulate the governing equations and an incremental solution scheme is adopted to simulate the nonlinear effects. The development of the model is presented in a general setting so that further extension or inclusion of other hydrodynamic models is possible. Numerical examples demonstrate the validity and capability of the mathematical formulation. Excellent comparison to experimental results are obtained using a relatively coarse grid of curved cable elements.

Subject Headings: Cables | Finite element method | System analysis | Hydrodynamics | Drag (fluid dynamics) | Curvature | Geometrics | Nonlinear response |

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