해양구조물공학 과제2- WAVE SPECTRUM
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- 2021.04.11
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- 2016.09
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"해양구조물공학 과제2- WAVE SPECTRUM"에 대한 내용입니다.
목차
1. Concept of a Wave Spectrum
2. Pierson-Moskowitz Spectrum
3. JONSWAP Spectrum
4. Application of Wave Spectrums
5. Reference
본문내용
1. Concept of a Wave Spectrum
1) Fourier Series
If we look out to sea, we notice that waves on the sea surface are not simple sinusoids. The surface appears to be composed of random waves of various lengths and periods. How can we describe this surface? The simple answer is, Not very easily. We can however, with some simplifications, come close to describing the surface. The simplifications lead to the concept of the spectrum of ocean waves. The spectrum gives the distribution of wave energy among different wave frequencies of wave-lengths on the sea surface.
The concept of a spectrum is based on work by Joseph Fourier (1768 - 1830), who showed that almost any function ζ(t) (or ζ(x) if you like), can be represented over the interval −T/2<t<T/2 as the sum of an infinite series of sine and cosine functions with harmonic wave frequencies:
This form of ζ(t) is called a Fourier series.
2) Application of Fourier Series
Now, let's apply these ideas to the sea surface. Suppose for a moment that the sea surface were frozen in time.
참고 자료
General Contents
Edward V. Lewis, 『Principles of Naval Architecture Second Revision-Vol 3』, The Society of Naval Architects and Marine Engineers, 1989
조철희 교수님, 강의자료『Design of Offshore structures』
김상현 교수님, 운동조종론 강의자료『Irregular Waves』
Wikiwaves.org, "Wave Spectrums",
http://www.wikiwaves.org/Ocean-Wave_Spectra
Concept of a Wave Spectrum
Wikipedia, “Wave spectrums",
http://www.wikiwaves.org/Waves_and_the_Concept_of_a_Wave_Spectrum