engleski

Operability Estimation of Exposed Berth based on Moored Ship Movements Criteria

The method of exposed berth operability estimation based on moored ship criteria for safe working and mooring is presented. The most important factor to consider the berth efficiency during year or season is the motion of moored ships on irregular waves. The solution methodology consists of modelling a ship as panel model used to calculate the hydrodynamic loads and responses from potential theory. The mooring lines are modelled by ship to ground spring elements. The stiffness of those elements is accumulated into the global restoring matrix of the rigid body equations of motion. The obtained system of differential equations is solved by frequency domain procedure taking explicitly into account the influence of shallow water. The effect of irregular waves is taken into account by appropriate wave spectrum. Illustrative applications of the method are given for a two ferryboats and one cruiser moored on the outside of jetty at Adriatic Sea harbour. The irregular sea is described by the Tabain spectrum. The significant values of the ship ramp displacements and velocities are compared with specific criteria limits.

Operability; Seakeeping; Moored ship; Berth efficiency

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