Maximum wave-energy absorption by oscillating systems consisting of bodies and water columns with restricted or unrestricted amplitudes

The theoretically maximum power absorbed from ocean waves by a system of several interacting oscillating bodies and water columns is studied for the case of unrestricted oscillation, as well as for the case when certain restrictions are applicable for the oscillation amplitudes. For the case when the radiation-damping matrix is singular, it is shown that the unconstrained maximum absorbed power is unambiguous even if the optimum oscillation is not then unique. Two different kinds of constraints are investigated for an axisymmetical system of an OWC in a floating body.