NONLINEAR DYNAMIC SIMULATION OF HYDRAULIC POWER TAKE-OFF SYSTEM FOR WAVE-POWER GENERATION

抄録

Hydraulic power take-off (PTO) system is the optional transmission for oscillating-bodies wave energy converters. This paper establishes the nonlinear dynamic model of typical hydraulic PTO system. Considering stiction, the Stribeck friction model and improved Wilson model are introduced to describe friction characteristics of hydraulic cylinder and hydraulic motor respectively. The pressure bound of high-pressure accumulator is also considered. Simulation of the dynamic model is done in MATLAB. Its results demonstrate that the hydraulic PTO system has Coulomb damping characteristic and that the high-pressure accumulator can stabilize pressure and flow. The tiny variation of piston velocity around zero is also displayed.