Wavelet transform based coherence analysis of freak wave and its impact |
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| Authors: | S.H. Kwon H.S. Lee C.H. Kim |
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| Affiliation: | aNaval Architecture and Ocean Engineering, Pusan National University, Pusan 609-735, Korea;bCivil Engineering Department, Ocean Engineering Program, Texas A&M University, College Station, TX 77843-3136, USA |
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| Abstract: | The present paper presents the results of a wavelet transform-based coherence analysis of freak wave and its impact. Wavelet transform has been used as a tool in analyzing signals in the time domain as well as in the frequency domain. The analysis was applied to laboratory-generated freak waves. The wavelet transform of the time history of the freak wave and its impact force revealed that a wide range of frequency components were contained in them. The coherence analysis was conducted on the wave and its impact force time histories. The coherence analysis revealed that some high-frequency components were highly correlated with the impact forces. The present study demonstrates that the wavelet transform can be an alternative tool in the analysis of strongly nonlinear freak wave and its impact. |
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| Keywords: | Freak waves Wave impact force Continuous wavelet transform Coherence analysis Smoothing of a signal Fourier transform |
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