Method for extracting random irregular wave characteristic parameter

A technology of parameter extraction and wave characteristics, applied in special data processing applications, electrical digital data processing, instruments, etc., can solve problems such as irregular changes and random irregularities

Active Publication Date: 2017-09-12
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

[0002] At present, in the research literature on offshore hoisting operations, most of them use regular waves as external excitations for analysis. This analysis method is relatively simple, but it is very different from the actual offshore hoisting operation environment. The waves on the actual sea surface are random and different. Regular, that is, the characteristic parameters of random irregular waves - the height of meaningful waves will show irregular changes over time

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  • Method for extracting random irregular wave characteristic parameter
  • Method for extracting random irregular wave characteristic parameter
  • Method for extracting random irregular wave characteristic parameter

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[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] like figure 1 As shown, a random irregular wave feature parameter extraction method includes the following steps:

[0031] 1) Input the meaningful wave height H corresponding to a certain level of sea state expected by random irregular waves 1 / 3 (Significant wave height H corresponding to the fourth sea state 1 / 3 =2.1 meters) and wave energy spectrum S(ω j ); wave energy spectrum S(ω j ) formula is:

[0032]

[0033] 2) For wave energy spectrum S(ω j ) frequency is discretized, and the wave energy spectrum S(ω j ) frequency range ω min ~ ω max Divided into N equal parts, N=30 in this example, and the direction angle χ of the random irregular wave is given at the same time, χ=30° in this example.

[0034] 3) Calculate the amplitude, frequency and wave number of the corresponding frequency equal division; the amplitude ζ of the jth rand...

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Abstract

The invention discloses a method for extracting random irregular wave characteristic parameters. The method comprises the following steps: firstly, inputting a significant wave height and a wave energy spectrum corresponding to a sea state of a grade that a random irregular wave expects to meet; secondly, calculating a wave amplitude, a frequency and a wave number divided by a corresponding frequency, and inputting a phase angle; secondly, generating a wave surface coordinate by using a wave surface equation of random irregular wave movement, extracting wave heights of the irregular wave by using the wave surface coordinate, arranging the wave heights from large to small, extracting 1 / 3 of all wave heights from large wave heights, and calculating a mean value; finally, recording the mean value of 1 / 3 parts of corresponding wave heights of ten continuous wave heights, and judging whether a stable deviation between an obtained mean value and a significant wave height of a provided sea situation is smaller than a provided deviation or not, thereby obtaining a wave surface coordinate of a sea situation of an expected grade. By adopting the method, random irregular wave characteristic parameter extraction is achieved, and precise coordinate parameters of random irregular waves of corresponding sea situations of different grades are generated.

Description

technical field [0001] The invention relates to the field of marine engineering, in particular to a method for extracting characteristic parameters of random irregular waves. Background technique [0002] At present, in the research literature on offshore hoisting operations, most of them use regular waves as external excitations for analysis. This analysis method is relatively simple, but it is very different from the actual offshore hoisting operation environment. The waves on the actual sea surface are random and different. Regular, that is, the characteristic parameters of random and irregular waves - the height of meaningful waves will show irregular changes over time. Through a large number of long-term observations and analyzes, people have found that the characteristic parameters of random irregular waves have certain statistical laws, and use the characteristic parameters of random irregular waves (significant wave height) as a reference to divide different sea stat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 金永平万步炎刘德顺彭佑多
Owner HUNAN UNIV OF SCI & TECH
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