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Group of Marine Dynamics and Hydrodynamics > 2.2 Nonlinear Motions and Loads > Publications
Veltcheva, A. and Guedes Soares, C. (2023), Analysis of Wave-Induced Ship Responses by Hilbert- Huang Transform Method, Ocean Engineering, Vol. 269, 113533
Time series of wave-induced ship responses are analysed by the Hilbert-Huang Transform (HHT) method. The results of the analysis of numerically simulated motions and loads on a chemical tanker in head waves are compared with the analysis of experimental data from laboratory model tests. The HHT analysis is applied to the sea surface elevations of two sea states (high and low seas) and the wave-induced vertical motions and bending moments and the results are discussed. It is found that the decomposition of the experimental data into intrinsic components compares well with the decomposition of the numerically simulated ones for both high and low seas. The first two or three intrinsic mode functions carry the major part of the energy of both experimental and numerically simulated data. The results of the present work provide confidence in the usage of numerical simulation data for the decomposition into intrinsic components of ship responses, avoiding the need for experimental data from laboratory model tests.
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