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The Royal Institute of Naval Architects

Delner Brakes Oct 2018

US Coast Guard

IJME 448

Paper Title: Estimation of hydrodynamic coefficients of a nonlinear manoeuvring  Mathematical model with free-running ship model tests

 

Authors

Haitong Xu, M A Hinostroza and C Guedes Soares Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, Portugal

Summary 

Free-running model tests have been carried out based on a scaled chemical tanker ship model, having a guidance, control and navigation system developed and implemented in LabVIEW. In order to make the modelling more flexible and physically more realistic, a modified version of Abkowitz model was introduced. During the identification process, the model’s structure is fixed and its parameters have been obtained using system identification. A global optimization algorithm has been used to search the optimum values and minimize the loss functions. In order to reduce the effect of noise in the variables, different loss functions considering the empirical errors and generalization performance have been defined and implemented in the system identification program. The hydrodynamic coefficients have been identified based on the manoeuvring test data of free-running ship model. Validations of the system identification algorithm were also carried out and the comparisons with experiments demonstrated the effectiveness of the proposed system identification method

Reference

Transactions RINA, Vol 160, Part A3, International Journal Maritime Engineering, Jul-Sep 2018 

DOI Number

DOI No: 10.3940/rina.ijme.2018.a3.448

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