Desenvolvimento e simulacao de um metodo de regulacao auto-adaptativa para absorcao dinamica das ondas de gravidade

Wave energy converters based on mechanical interactions with a solid body or the devices builder on oscillating water column movement created by an input pressure variation, can be easily modelled in the framework of linear theory of free surface perfect fluid flow. In the case of bidimensional devices (e.g. facing the incident wave filed), the theoretical and numerical modelling can be performed beyond the restrictions of linear theory (low wave steepness). The devices can be simulated using non-linear time step methods up to wave breaking limit. In this work, we addressed the simulation of oscillating water column devices, in both linear and non-linear approaches. According to the conclusions established by Maisondieu in 1993, we have initially developed and tested an improvement of a dynamical controller designed to drive a piston wave absorber. This work has been done by integrating a frequency estimator based on the extended Kalman filter. The various available control methods have been introduced into the time domain simulation code Canal 1.4, developed at the Hydrodynamic Laboratory of Ecole Centrale de Nantes to be tested in linear and non-linear theory. In a second step, we have developed a numerical model of an oscillating water column device including the air column and his compressibility effect, as well as the Well's turbine transforming the alternating air flow into electricity. Then, we have applied to this kind of system, the previous approach Clement / Maisondieu to reduce the non-causality problem of the optimal controller. Lastly, we have transposed the strategy of the adaptive regulation, of a piston wave absorber, developed at the beginning of this work to the case of an oscillating water columnAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1249-074 Lisboa, Portugal / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga