Method and system for determining safe under keel clearance of ultra-large ship

A system for determining a safe under keel clearance of an ultra-large ship, comprising:

• a first acquisition module configured to acquire an operation parameter values of the ultra-large ship;
• a fluid pressure determination module configured to obtain the fluid pressure according to the operation parameter values of the ultra-large ship;
• a squat force/trim moment determination module configured to obtain the squat force and the trim moment of the ultra-large ship according to the fluid pressure;
• a mirror image model establishing module configured to establish a mirror image model based on a velocity potential;
• a squat clearance calculation model establishing module configured to establish a squat clearance calculation model for the ultra-large ship according to the established mirror image model based on the speed potentia;
• a half-wave rising height determination module configured to determine rising height of the half-wave according to the squat clearance calculation model for the ultra-large ship;
• a draught/trim change determination module configured to obtain a draught change and a trim change according to the squat force and the trim moment;
• a hull maximum squat clearance determination module configured to determine a maximum squat clearance of the hull according to the draught change and the trim change;
• a second acquisition module configured to obtain a difference between salt water and fresh water, increased draught by heeling, and reduced draught by an oil-water consumption;
• a ship safe under keel clearance determination module configured to determine the safe under keel clearance of the ship according to the difference between the salt water and the fresh water, the increased draught by heeling, the reduced draught by the oil-water consumption, the rising height of the half-wave and the maximum squat clearance of the hull;
• and
• a loading rate determination module configured to control the squat clearance of the ultra-large ship according to the safe under keel clearance of the ship.