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The floating-type double-hinged wave energy converter (WEC) is developed to realize the conversion of wave energy. Based on the linear wave theory and wave-body coupled interaction, the nonlinear coupled equations of the heaving-pitching motions for the buoys are established. Under the condition of entirely linear PTO (power take-off system), the analytical solutions of pitching angles are deduced. Then the amplitude-frequency response characteristics of pitching motion and transfer power are discussed. When the collision chocks are installed in the hydraulic PTO, the time-domain changing laws of pitching angles and angular velocity are calculated by using numerical methods. The results show that the coupling effects are significant for the heaving-pitching motion. With the realistic hydraulic PTO, the average transfer power is about 11.5% lower than that of entirely linear PTO, and pitching motions of buoys show the complex periodic characteristics with wave period.

Analytical Research of Buoy Motion and Power Response of the Floating-Type Double-Hinged Wave Energy Converter