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A Method for Determining the Load Response Model of Elastic Hull in Irregular Waves

A technology for determining methods and response models, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as high hardware requirements and difficult to achieve accuracy

Inactive Publication Date: 2018-03-23
HARBIN INST OF TECH AT WEIHAI
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Problems solved by technology

[0004] However, the ... method in the prior art still has the following problems: 1. For the determination of high-frequency hydrodynamic coefficients, the method of global integration is often used, which may lead to excessively high hardware requirements due to the large amount of calculation Problem; 2. In order to improve the efficiency, it is difficult to achieve higher accuracy due to the reason of truncation to determine the hydrodynamic coefficient of the high frequency by using the method of truncation frequency

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  • A Method for Determining the Load Response Model of Elastic Hull in Irregular Waves
  • A Method for Determining the Load Response Model of Elastic Hull in Irregular Waves
  • A Method for Determining the Load Response Model of Elastic Hull in Irregular Waves

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Embodiment approach

[0045] 1. Determine the equation of nonlinear time domain motion equation of the hull

[0046] Based on the three-dimensional potential flow theory, a theoretical model of elastic body with speed hull motion and wave load is constructed. The nonlinear time domain motion equation of the hull is as follows:

[0047]

[0048] In the formula: [a], [b], [c]——structural generalized mass matrix, generalized damping matrix, generalized stiffness matrix; [C]——generalized fluid restoring force coefficient matrix, Indicates the contribution of the hydrostatic pressure generated by the vertical displacement of the k-th order mode of the hull to the r-th order motion mode; ρ—seawater density; g—gravitational acceleration; ——normal vector of object surface; S(t)——instantaneous object surface; ——represents the displacement vector produced by the rth order free motion mode of the elastic hull structure; w k ——the vertical displacement of the hull in the k-th order mode; [μ]——the gener...

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Abstract

The present invention relates to a method for determining the load response model of an elastic hull in irregular waves, when the hull is cut off at the cut-off frequency of the high-frequency fluid damping coefficient B(ω) in the determination of the time-domain delay function considering the elastic effects of the hull In the integral interval of the domain delay function, the entire integral interval is divided into two parts; in the interval, it is divided into a limited number of small intervals, and the integration in this interval is realized to obtain the damping coefficient B(ω) of this interval; In the interval, an exponential decay function is selected to simulate the damping coefficient B(ω), and then the infinite integral Krk(τ) of the time domain delay function of the hull is obtained. The invention can not only take into account the influence of the truncation error, but also make up for the defect of the existing method that the hardware requirements are too high due to the large amount of calculation.

Description

technical field [0001] The invention relates to the hydrodynamic field of ship and marine engineering wave load technology, in particular to a method for determining the load response model of an elastic hull in irregular waves. Background technique [0002] As we all know, the actual ocean wave is an irregular wave, which is formed by the superposition of countless regular wavelets with different amplitudes and frequencies. Therefore, in order to predict the load response under random ocean waves, the influence of different wave frequencies on the results must be considered. However, most of the traditional load response predictions of irregular waves only consider the single frequency of the main peak of the wave, or they are two-dimensional problems that cannot take into account the influence of the time-varying characteristics of physical quantities such as amplitude and frequency of irregular waves on the results. All of these make the prediction accuracy of hull respon...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 陈占阳
Owner HARBIN INST OF TECH AT WEIHAI
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