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Publications
Pires da Silva, P., Sutulo, S. and Guedes Soares, C. (2023), Sensitivity Analysis of Ship Manoeuvring Mathematical Models, Journal of Marine Science and Engineering, Vol. 11, 416
Sensitivity analysis in general and applied to ship manoeuvring mathematical models overview is described as means of dealing with model uncertainty and model simplification. Then sensitivity analysis is performed on 3 degrees of freedom manoeuvring mathematical model obtained from a generic polynomial model tuned with available results of full-scale trials of the ship under study. The obtained model is considered the reference model and the sensitivity analysis consists of multiple perturbed simulations of turning, zigzag and spiral manoeuvres. The perturbations are applied to the total hydrodynamics forces and moments and separately to their characteristic parts i.e. to the linear, and nonlinear single and mixed components. The metric for resulting deviations of the model’s responses is estimated using the Euclidean metric. The performed analysis permitted to trace the sensitivity of the model to various parameters and their groups, and the obtained data are expected to be useful in the application of system identification methods to typical inherently stable surface displacement ships. The used method of partial sensitivity analysis showed to be robust by comparison to the classic IMO manoeuvring performance variables and it gives more information and insight into the sensitivity of the model. The comparison of simulation results obtained by the original and the simplified models shows the effectiveness of the sensitivity analysis and the validity of the reduced model, using the linearity grouping of parameter analysis and the use of the Euclidean metric.
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