Application of wavelet transforms to the decoupling of free-roll decay data |
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| Authors: | SH Kwon DW KimHS Lee |
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| Institution: | a Department of Naval Architecture and Ocean Engineering, Pusan National University, Pusan 609-735, South Korea
b Daewoo Shipbuilding and Marine Engineering Co., Ltd., Koje-City, 656-714, South Korea |
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| Abstract: | This study presents the results of the decoupling of a free-roll decay test by wavelet transforms. A free-roll decay test was performed to determine the coefficients of damping terms in equations of motion. No motion of the model was restricted during the experiment. A slight yaw motion was found while the model was in the free-roll decay motion. It was necessary to extract a pure roll motion from the experimental data. Wavelet transforms were applied to the signals to extract the pure roll motion. The results were compared to those found through the Fourier transform. Discrete wavelet transforms were able to efficiently decouple the test signals, while the continuous wavelet transform and the Fourier transform could not. |
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| Keywords: | Decoupling of signals Continuous wavelet transform Discrete wavelet transform Fourier transform |
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