A nonlinear dynamic analysis method for ship lateral flutter in regular waves

A technology of nonlinear dynamics and analysis methods, which is applied in the field of nonlinear dynamics calculation and analysis of ships under the excitation of regular waves. high effect

Active Publication Date: 2022-07-05
TIANJIN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, there are few applications of nonlinear dynamics such as bifurcations to this problem

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  • A nonlinear dynamic analysis method for ship lateral flutter in regular waves
  • A nonlinear dynamic analysis method for ship lateral flutter in regular waves
  • A nonlinear dynamic analysis method for ship lateral flutter in regular waves

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Embodiment Construction

[0087] In order to further understand the content of the invention, features and effects of the present invention, the following embodiments are exemplified and described in detail with the accompanying drawings as follows:

[0088] The invention combines the ship motion theory with the nonlinear dynamics theory, proposes a new measurement index and a new concept of ship motion instability, and establishes a nonlinear dynamics analysis method and analysis process.

[0089] like figure 1 As shown in the figure, a nonlinear dynamic analysis method for ship lateral fling in regular waves includes the following steps:

[0090] 1. First, establish the differential equation of the ship's yaw motion in regular waves:

[0091]

[0092] In the formula, ψ is the heading angle, F is the wave moment in the direction of the ship's yaw motion, δ is the rudder angle, K and T are the ship's maneuverability index, where, I represents the moment of inertia of the hull yaw, M represents th...

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Abstract

The invention discloses a nonlinear dynamic analysis method for ship sway in regular waves: establishing a differential equation of the ship's yaw motion in regular waves; The boundary of the stability domain is obtained, and the schematic diagram of the stability domain of the solution of the differential equation of the ship's yaw motion is obtained. According to the schematic diagram of the stability domain, the theoretical critical value of the coefficient of the parameter excitation term in the differential equation of the yaw motion is obtained. Based on the bifurcation nonlinear dynamics theory, numerical Methods The bifurcation characteristics of the ship's yaw motion were calculated, and the bifurcation diagram of the ship's yaw angle with wave height was obtained to determine the reliability of the theoretical critical value of the parameter excitation coefficient; the critical condition of the ship's lateral fling was determined according to the schematic diagram of the stability domain. The invention adopts the nonlinear dynamic analysis method to analyze the stability domain of the safe navigation of the ship for the lateral slinging motion of the ship in the regular wave, and provides an analysis method and a safe navigation basis for the safe navigation of the ship.

Description

technical field [0001] The invention relates to nonlinear motion analysis of ships, in particular to a nonlinear dynamic calculation and analysis method for ships to laterally sling under the excitation of regular waves. Background technique [0002] The ship's wave-riding / slinging motion is one of the failure modes in the second-generation intact stability of ships. The nonlinear dynamic characteristics of the ship in the process of riding the wave / swinging motion are the most significant in the mode of ship instability. The ship roll motion instability mode refers to that when the ship sails in the waves, the rudder loses the control effect on the ship, and the ship turns sharply, and the ship may roll sharply during this process. [0003] Numerical analysis methods are used in most studies on the lateral flutter motion of ships in regular waves. This method is directly calculated and can consider more complex factors in the model, but it can only consider one working co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F30/15G06F17/13G06F119/14
CPCG06F30/15G06F30/20G06F17/13G06F2119/14Y02T90/00
Inventor 王丽元刘峥李焱唐友刚童波
Owner TIANJIN UNIV
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