A Method for Extracting Characteristic Parameters of Random Irregular Waves
A technology of parameter extraction and wave characteristics, applied in the field of marine engineering, can solve problems such as random irregularities and irregular changes
Active Publication Date: 2018-07-13
HUNAN UNIV OF SCI & TECH
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
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
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0030] Such as 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] 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.
[0033] 3) Calculate the amplitude, frequency and wave number of the corresponding frequency equal division; the amplitude ζ of the jth random irre...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More 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...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/11
CPCG16Z99/00
Inventor 金永平万步炎刘德顺彭佑多
Owner HUNAN UNIV OF SCI & TECH