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Method for determining elastic ship body load responding model in irregular wave

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 difficult to achieve accuracy and high hardware requirements

Inactive Publication Date: 2015-08-19
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

Method used

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  • Method for determining elastic ship body load responding model in irregular wave
  • Method for determining elastic ship body load responding model in irregular wave
  • Method for determining elastic ship body load responding model in irregular wave

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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] ( [ a ] + [ μ ] ) p · · r ( t ) + [ b ] ...

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Abstract

The present invention relates to a method for determining an elastic ship body load responding model in an irregular wave. The method comprises the following steps: truncating an integrating range of a ship body time domain delay function at a truncating frequency omega-hat of a high-frequency fluid damping coefficient B(omega) during the determination of the time domain delay function considering the ship body elastic effect and dividing the whole integrating range into two parts (0,omega-hat) and (omega-hat, infinity); dividing the range (0,omega-hat) into a limited number of small ranges, and performing integration in the range to obtain the damping coefficient B(omega) of the range; selecting an exponential decay function for simulating the damping coefficient B( omega) in the range (omega-hat, infinity) so as to obtain an infinite limit integral K<rk>(t) of the ship body time domain delay function. By virtue of the method, the influence on the truncating errors can be eliminated; and the defect of high requirement on hardware because of large calculation quantity of the method in the current method can be solved.

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 Applications(China)
IPC IPC(8): G06F17/50
Inventor 陈占阳
Owner HARBIN INST OF TECH AT WEIHAI
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