260 - Moored dock under random waves: a stochastic perturbation and linearization technique.
Culla A., Massi F.
Abstract
Aim of this paper is to predict the motion of a dock moored by a couple of cables in irregular waves. Wave forces, of random nature, are determined by a modified Morison equation. The nonlinear effects of the loads and of the cables governing equations are taken into account. The statistical linearization technique is applied to the non linear reaction force of the cable as well to the hydrodynamic load. A random time dependent coefficient of the system governing equation is due to the Morison equation. The stochastic perturbation technique allows to change a random differential equation with a deterministic differential equation. The advantage of the presented procedure is to obtain a problem which can be solved by the theory of random linear system, versus a completely nonlinear random differential problem. The statistical properties of the original solution holds, while the computational burden is avoided.
Citation
Culla A.; Massi F.: Moored dock under random waves: a stochastic perturbation and linearization technique., CD-ROM Proceedings of the Thirtheenth International Congress on Sound and Vibration (ICSV13), July 2-6, 2006, Vienna, Austria, Eds.: Eberhardsteiner, J.; Mang, H.A.; Waubke, H., Publisher: Vienna University of Technology, Austria, ISBN: 3-9501554-5-7
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