This paper deals with an investigation of the non-linear destabilizing effects caused by the coupling of the transverse modes. The fact that a marine cable or a riser operates within a wet environment and their dynamic behavior is affected by the hydrodynamic drag does not reduce the importance of instabilities. The study is focused in the lateral responses of the structure due to the parametric excitation. The systems dynamic equilibrium is described through an infinite set of differential equations, having as unknowns the the time-dependant generalized variables of lateral motion. The simplified equations resemble a parametrically excited dynamic system having repeated frequencies, Nayfeh and Mook (1979), Nonlinear Oscillations. The conditions of coupled instabilities are sought in regions that depend on the initial lateral natural frequencies. Thus, the procedure retains the first two modes of lateral response and is applied to a specific case study of parametric excitation. The theoretical predictions are validated through numerical solution of the differential equations obtained using the Matlab software package.
Coupling instabilities for marine slender structures with applications to elastic risers and cables
Kopplungsinstabilitäten für schlanke meerestechnische Strukturen mit Anwendungen auf elastische Riser (Steigrohre) und Kabel.
Ship Technology Research / Schiffstechnik ; 52 , 1 ; 2-13
2005
12 Seiten, 15 Bilder, 1 Tabelle, 27 Quellen
Article (Journal)
English
Coupling Instabilities for Marine Slender Structures with Applications to Elastic Risers and Cables
Online Contents | 2005
|Coupling Instabilities for Marine Slender Structures with Applications to Elastic Risers and Cables
Taylor & Francis Verlag | 2005
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