Abstract
In order to investigate the parametric excitation of loads suspended from crane vessels in random seas a time domain numerical solution of the equations of motion is used. A computer program was developed to analyse in the time domain the equation of motion of a crane vessel and its suspended load. The system is described by the six rigid body degrees of freedom of the vessel, together with the three orthogonal displacements of the lift mass. Random force time histories were applied to the vessel based on the Pierson-Moskowitz spectral formulation. This time domain model is used here to demonstrate the influence of realistic sea states on the parametric excitation of crane loads.
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