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Parameter estimation for a ship’s roll response model in shallow water using an intelligent machine learning method
Chen, C.; Tello Ruiz, M.Á.; Delefortrie, G.; Mei, T.; Lataire, E.; Vantorre, M. (2019). Parameter estimation for a ship’s roll response model in shallow water using an intelligent machine learning method, in: Candries, M. et al. 5th MASHCON International Conference on Ship Manoeuvring in Shallow and Confined Water with non-exclusive focus on manoeuvring in waves, wind and current, 19 - 23 May 2019, Ostend, Belgium. pp. 51-59
In: Candries, M. et al. (2019). 5th MASHCON International Conference on Ship Manoeuvring in Shallow and Confined Water with non-exclusive focus on manoeuvring in waves, wind and current, 19 - 23 May 2019, Ostend, Belgium: conference proceedings. Flanders Hydraulics Research/Ghent University. Maritime Technology Division: Antwerp. XIX, 534 pp., more

Available in  Authors 
Document type: Conference paper

Author keywords
    Roll model; Shallow water; NLS-SVM; Damping parameters; Parameter identification

Authors  Top 
  • Changyuan, C.
  • Tello Ruiz, M.Á., more
  • Delefortrie, G., more

Abstract
    In order to accurately identify the ship’s roll model parameters in shallow water, and solve the problems of difficult estimating nonlinear damping coefficients by traditional methods, a novel Nonlinear Least Squares - Support Vector Machine (NLS-SVM) is introduced. To illustrate the validity and applicability of the proposed method, simulation data and decay tests data are combined and utilized to estimate unknown parameters and predict the roll motions. Firstly, simulation data is applied in the NLS-SVM model to obtain estimated damping parameters, compared with pre-defined parameters to verify the validity of the proposed method. Subsequently, decay tests data are used in identifying unknown parameters by utilizing traditional models and the new NLS-SVM model, the results illustrate that the intelligent method can improve the accuracy of parametric estimation, and overcome the conventional algorithms’ weakness of difficult identification of the nonlinear damping parameter in the roll model. Finally, to show the wide applicability of the proposed model in shallow water, experimental data from various speeds and Under Keel Clearances (UKCs) are applied to identify the damping coefficients. Results reveal the potential of using the NLS-SVM for the problem of the roll motion in shallow water, and the effectiveness and accuracy are verified as well.

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