Nonlinear dynamics of a tightly moored point-absorber wave energy converter

► Frequency and time domain analysis of tight moored floating point absorber. ► Analysis on the nonlinear motion dynamics introduced by the mooring system. ► Nonlinear behaviour from relationship between cable tension and buoy displacements. ► Frequency domain gives for linear PTO good approximation except surge amplitude. ► For nonlinear systems, important to account for nonlinearities, for motion and power.