METHOD FOR DETERMINING SHIP HYDRODYNAMIC POSITIONING CHARACTERISTICS Russian patent published in 2021 - IPC B63H25/00 

FIELD: physics.

SUBSTANCE: invention relates to control of ships and can be used for prediction of trajectories of ships, as well as underwater objects located in surface position, performing complex manoeuvring. Determination of position hydrodynamic characteristics of ship includes determination of centre of ship rotation, formation of three-dimensional electronic model of ship, at that part of ship hull located above waterline is cut off. Internal computation grid in the form of a spherical segment is formed around this three-dimensional electronic model of the ship, an internal computational grid in the form of a spherical segment is made with possibility of rotation together with a three-dimensional electronic model of the ship relative to the external computational grid. Base of the segment comprises a plane of the waterline of the model, and the axis of symmetry of the segment is aligned with the axis of rotation of the model. In calculation area occupied by internal and external computational grids, distribution of flow velocity and pressure fields is determined. Velocity of fluid motion at inlet boundary relative to flow boundary of design area is set equal to linear speed of ship. Angular movements of ship three-dimensional electronic model are sequentially set by drift angle and determining stationary hydrodynamic effects on three-dimensional electronic model of ship at different values of drift angle, analysing them and then determining position hydrodynamic characteristics of ship.

EFFECT: higher safety of ship control when performing complex manoeuvring and higher accuracy of ship control.

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