Identification method of ship lateral three-degree-of-freedom motion parameters based on multi-objective evolutionary algorithm

Abstract

The invention belongs to the two fields of ship motion parameter identification and evolution calculation, and in particular relates to a ship lateral three-degree-of-freedom motion parameter identification method based on a multi-objective evolution algorithm. It includes the following steps: according to the lateral three-degree-of-freedom differential equation of the ship, establish the state equation and observation equation model; according to the experimental data of the pool, establish the disturbance force and disturbance moment model of the ocean wave; use the Manhattan distance as the evaluation standard to evaluate the observation value and model output The error between values ​​is established to establish a multi-objective output model of ship lateral motion; the evolutionary algorithm is used to optimize the multi-objective optimization function of ship lateral motion, and the optimal pareto front surface is given; a parameter corresponding to a point is selected from the front surface as output optimal parameters. There is no need to consider the weighting factors between the movements of the individual degrees of freedom. A series of non-dominant solutions can be obtained, and the most suitable set of lateral hydrodynamic parameters can be selected from these solutions according to customer preferences. The experimental data is small, the efficiency is high, and the error is small.

Description

Identification method of ship lateral three-degree-of-freedom motion parameters based on multi-objective evolutionary algorithm technical field The invention belongs to two major fields of ship motion parameter identification and evolutionary calculation, and is specifically related to a kind of based on multi-objective A method for identification of ship transverse three-degree-of-freedom motion parameters based on the algorithm. Background technique When a ship sails at sea or performs a combat mission, it is bound to be disturbed by the marine environment such as waves, sea wind and currents. The effect of the movement will inevitably produce a swaying motion, which includes roll, pitch, bow, sway, surge, and vertical Swing (or heave). The ship motion model describes the response characteristics of the ship to the control input (rudder angle) during the motion process. With the development of transportation, the research of ship motion model is more and more impo...

AI Technical Summary

Problems solved by technology

[0007] To sum up, there are many problems in the existing technology, such as too many experiments, too many parameters, high coupling degree between parameters, mutual influence between parameters, too complicated operation, and low precision.

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