Numerical wave tank identification of nonlinear discrete time\ud hydrodynamic models

摘要

Hydrodynamic models are important for the design, simulation and control of wave energy\udconverters (WECs). Linear hydrodynamic models have formed the basis for this and have been well verified\udand validated over operating conditions for which small amplitude assumptions apply. At larger amplitudes a\udnumber of nonlinear effects may appear. One of these effects is due to the changing bouyancy force as the body\udmoves in and out of the water. In this paper we look at identifying a nonlinear static block to be added the linear\udhydrodynamic model to account for this effect. The parameters for this nonlinear block are identified from WEC\udexperiments simulated in a numerical wave tank (NWT). The parameters for the linear hydrodynamic model are\udalso identified from NWT experiments. Here we explore the use of a discrete time linear hydrodynamic model\udwhich is well suited to the identification procedure