Gray-Box Modeling of Ship Manoeuvring Motion Using On-Line Support Vector Machine

The ship maneuvering motion online gray box modeling is conducted with support vector machine (SVM) using sliding time windows. Taking the simulated data from 15°/15°zigzag test and the computed data for hydrodynamic forces and moment to be input and output respectively, the Online and offline SVMS are used to confirm the complex functions in the hydraulic power ship maneuvering movement model. The data from the 20°/20°zigzag simulation test and the identified nonlinear functions are applied to forecast the hydrodynamic forces and moment. The forcasted findings are compared with those of the hydrodynamic force and the moment calculation. The findings show that the recommended online SVM is superior to the offline SVM in determination of the complicated functions in the ship maneuvering motion hydrodynamic model, and is a kind of useful gray-box modeling method for ship maneuvering movement.