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You are here: Home / Research / Publications / Floating Structures / Estimation of Directional Ocean Wave Spectra by Fourier Methods as Enhanced by Simulated Annealing with a MEM Objective Function / Abstract C72

Abstract C72

Abstract ID#:
C72

 

Report Title:
Estimation of Directional Ocean Wave Spectra by Fourier Methods as Enhanced by Simulated Annealing with a MEM Objective Function

 

Authors:
Mihail Petrakos, Texas A&M University

 

Report Date:
June, 1995

This study refers to the estimation of the distribution of the ocean wave energy with respect to the direction. It consists of two parts. First a preliminary deterministic model is derived, which is used as a base for the statistical theory of ocean waves. Some basic elements and concepts of the theory are also presented along with the data estimates of the spreading function which is to be estimated. A Fourier series expansion of the spreading function is introduced to obtain a solution which is improved with the Maximum Entropy principle. A Simulated Annealing algorithm is utilized in order to achieve the maximization of the Entropy function. Simulated Annealing as it is described in the text is a method which iteratively seeks to optimize a function of discrete variables. A particularly useful property of this method is that it can reach a global optimum even if it is hidden between local ones. Finally some examples are presented using the above method and simulated data.

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