Journals Proceedings

International Journal of Water & Hydro Constructions

Correlation of Metocean Parameters for Malaysian Waters

Author(s) : LIEW M.S, OTHMAN N.A

Abstract

Numerous time series analysis method has been introduced. Metocean forces are known as the most challenging factors in designing stage of offshore structure. Environmental loads are also known as the basic design of any primary structure of offshore platforms. Cross-spectral analysis enables two parameters to be analyzed simultaneously. In this research, a cross-spectral analysis of two environmental loads which are; wind speed and wave height, will be analyzed simultaneously. Cross-spectral density is defined as the Fourier Transform of the corresponding cross-correlation function. Cross-correlation is a measure of similarity of these two waveforms as a function of a time-lag applied to one of them. In time series analysis, the crossspectrum is used as part of frequency domain analysis of the cross-correlation between two time series. Cross-spectral analysis is also known as an extension of spectral analysis. Spectral analysis is described as a representation of a time series or mathematical functions in the frequency domain. Spectral and cross-spectral analysis has a number of applications in electronics and mechanical engineering such as a measure of magnitude of a harmonic distortion, a measure of extra signals (inter-modulation distortion), a measure of harmonic content of a signal, extraction of signals from noise may require knowledge of the crossspectrum of the signal noise, it is useful to see the spectrum diagram for modulation and other waveforms manipulations. Thus, this research will bring valuable information about the environmental loads acting on offshore structures. The crossspectrum which will be generated throughout this research will also help to acquire knowledge of the spectrum of the signal and the noise. The objectives of this paper are (i) To develop crossspectral analysis of two parameters; wind and waves, in the frequency domain. (ii) To study the frequency range of the peak energy content of the generated cross-spectrum. Findings from this research have distinguish resemblance among the frequency peaks range that is significant for understanding the environment of offshore structures.

No fo Author(s) : 2
Page(s) : 9 - 13
Electronic ISSN : 2374 - 1600
Volume 1 : Issue 1
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