Method for identifying longitudinal motion models of trimaran

Abstract

The invention designs a method for identifying longitudinal motion models of a trimaran. The longitudinal motion models are mainly a force bearing model of the trimaran under the action of waves based on a genetic algorithm and a motion model of the trimaran under the action of force based on equation decoupling. Wave force and wave torque are obtained according to towing experiments of the trimaran, and the genetic algorithm is utilized to identify the force bearing model of the trimaran under the action of the waves. Additional mass, a damping coefficient, a recovery coefficient, heaving mass and longitudinal inertia torque are obtained according to the towing experiments of the trimaran, and a kinetic equation of ships is decoupled to identify the motion model of the trimaran under the action of the force. The method for identifying the longitudinal motion models of the trimaran is applicable to the analysis of the motion of the trimaran under complex sea conditions and widely applied to the anti-pitching control of the ships; the rapidity and intellectuality of the algorithm can ensure that the actual motion can be accurately estimated under high-speed and complex sea conditions through the adoption of the obtained trimaran models.

Description

technical field [0001] The invention relates to a trimaran longitudinal motion model identification method, specifically belonging to a modeling method in the field of navigation. Background technique [0002] Since the second half of the 20th century, various types of ships have been launched and put into use, and their speed and size have shown an increasing trend. The overall width of the multihull is large, so it has a large deck area and high stability, and has been widely used. For a high-speed multihull ship, it operates at high speed most of the time, and the amplitude of the two motions of heave and pitch increases significantly when the ship is sailing at high speed. The impact caused by motion in other directions is negligible. Therefore, the main factors affecting the navigation of high-speed boats are heave motion and pitch motion, which can be collectively referred to as the longitudinal motion of high-speed boats. [0003] The trimaran longitudinal motion m...

AI Technical Summary

Problems solved by technology

[0004] A high-speed ship model identification method based on the nonlinear least squares method is proposed according to the nonlinear least squares method of the high-speed ship model under constraints in the literature, but the disadvantage is that the search range of the traditional least squares method is small, which leads to model identification errors bigger

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