Abstract
The method to process measured data of ship model test with contact measurement to study the characteristics of relative motion between two side-by-side ships was investigated. The reference co-ordinate systems and the relative motions of two side-by-side replenishment ships were defined. Then the integration transform method which combines Fast Fourier Transform(FFT) with Empirical Mode Decomposition(EMD) self-adaptive filter was applied to transform measured acceleration signal into displacement. The EMD adaptive filter is designed, and the integration results from acceleration to displacement with and without EMD adaptive filter were compared, which shows that the EMD adaptive filter can effectively eliminate the noise embedded in the measured data. At last, the relative motions are acquired, which are consistent with the practical situation.
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