A device and method for predicting the coupling hydrodynamic forces of a ship with ice and the motion of the ship

By combining linearized potential flow theory and Green's function with the boundary element method, a method for predicting the coupled hydrodynamics of floating ice and ships and ship motion was established. This method addresses the shortcomings in the analysis of ship hydrodynamic characteristics in ice-covered areas and enables safe and high-precision prediction of polar navigation.

CN115600400BActive Publication Date: 2026-04-24JIANGSU UNIV OF SCI & TECH +1
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Patent Information

Application Number
CN202211255034.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-13
Publication Date
2026-04-24
Estimated Expiration
2042-10-13

AI Technical Summary

Technical Problem

Existing technologies cannot effectively analyze the hydrodynamic characteristics and motion prediction of ships in ice-covered areas, especially when floating ice is coupled with ships in wave fields, resulting in unresolved safety issues in polar navigation.

Method used

By employing linearized potential flow theory and an elastic thin plate model, combined with Green's function and boundary element method, a device and method for predicting the coupled hydrodynamics of floating ice and ships and the motion of ships are established. Prediction is performed through a numerical calculation program to solve fluid dynamics problems, eliminate the influence of irregular wave frequencies, and calculate the added mass, damping coefficient, and wave excitation force of the hull.

Benefits of technology

It enables high-precision prediction of ship hydrodynamics and motion in polar environments, improves computational efficiency, and ensures the safety of ship navigation.

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Abstract

The present application belongs to the field of ship hydrodynamics and motion prediction, and in particular to a device and method for predicting the hydrodynamics and motion of a ship coupled with ice, which first derives a Green function that satisfies the boundary conditions of the ice layer and the free surface, as well as all other conditions except the surface condition of the ship, and through the Green function, the differential equation of the velocity potential is converted into a boundary integral equation on the surface of the ship only, which introduces an extended surface at the waterline of the ship body to eliminate the influence of irregular wave frequencies; an asymptotic solution formula of the Green function is analytically derived, thereby establishing an approximate and effective solution program for the coupled interaction of the ship / wave / ice layer, and numerically calculating the results of the added mass, damping coefficient and wave exciting force of the ship body; through the method, the interaction mechanism of the water wave / ship / ice layer under different parameter characteristics can be deeply understood, and theoretical support is provided for the hydrodynamic problems, motion prediction and rational design of polar ships.
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