Nonlinear kinetic analysis method for ship wave riding in regular waves

A technology of nonlinear dynamics and analysis method, which is applied in the field of nonlinear dynamics calculation and analysis of ship riding waves under the excitation of regular waves, and can solve problems such as difficulty in drawing general conclusions

Active Publication Date: 2021-03-05
TIANJIN UNIV
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Problems solved by technology

This method is straightforward to calculate and can consider more complex factors in the model, but it can only calculate and consider one working condition at a time, and it is not easy to draw general conclusions

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  • Nonlinear kinetic analysis method for ship wave riding in regular waves
  • Nonlinear kinetic analysis method for ship wave riding in regular waves
  • Nonlinear kinetic analysis method for ship wave riding in regular waves

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Embodiment Construction

[0063] In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0064] The invention combines the theory of ship motion with the theory of nonlinear dynamics, proposes a new measurement index and new concept of ship motion instability, and establishes an analysis method and flow of nonlinear dynamics.

[0065] Hull motion coordinate system such as figure 1 as shown, figure 1 Among them, O(x,y,z) is the geodetic fixed coordinate system, O′(x′,y′,z′) is the onboard coordinate system, O″(x″,y″,z″) is the wave coordinate system , ξ G is the position of the center of gravity of the ship in the geodetic coordinate system, ζ G is the position of the center of gravity of the ship in the wave coordinate system.

[0066] Such as figure 2 As shown, a nonlinear dynamics analysis method for ship riding waves in ...

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Abstract

The invention discloses a nonlinear kinetic analysis method for ship wave riding in regular waves. The nonlinear kinetic analysis method comprises the following steps: establishing a surging motion differential equation of a ship in the regular waves; based on a bifurcation nonlinear dynamics theory, calculating ship wave riding motion bifurcation characteristics by adopting a numerical method toobtain a bifurcation diagram of the relative speed between a ship and waves changing along with the rotating speed of a propeller, and according to the bifurcation diagram, obtaining a numerical propeller critical rotating speed when the ship sails thorugh the waves; combining a nonlinear dynamic Merlinkov method with a ship motion theory, analyzing ship surging motion based on a heteroclinic orbit, and calculating a theoretical propeller critical rotating speed when the ship sails thorugh waves so as to determine the reliability of the numerical propeller critical rotating speed; and determining conditions of ship wave riding instability according to the bifurcation diagram. According to the method, the stability domain of safe navigation of the ship is analyzed by adopting a nonlinear kinetic analysis method for the wave riding motion of the ship in regular waves, and an analysis method and a safe navigation basis are provided for safe navigation of the ship.

Description

technical field [0001] The invention relates to nonlinear motion analysis of a ship, in particular to a nonlinear dynamics calculation and analysis method for a ship riding waves under the excitation of regular waves. Background technique [0002] Ship wave riding / swing motion is one of the failure modes in the second-generation intact stability of ships. During the wave riding / swinging motion of the ship, its nonlinear dynamic characteristics are the most significant in the mode of ship instability. The wave-riding instability mode of the ship refers to the phenomenon that when the ship is sailing in a specific wave condition, the ship propulsion control system loses control of the ship and makes the ship move forward with the waves. [0003] For the wave-riding motion of ships in regular waves, most studies adopt numerical analysis methods. This method is straightforward to calculate and can consider more complex factors in the model, but it can only calculate and consid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F113/08G06F119/14
CPCG06F30/28G06F2113/08G06F2119/14
Inventor 王丽元唐友刚刘峥李焱童波
Owner TIANJIN UNIV
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