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A single-buoy wave energy converter (WEC) consisting of double hydraulic cylinders is designed to promote the conversion power of traditional oscillating buoy WEC by absorbing the energy of pitching motion. On the condition of linear, regular waves, the nonlinear coupled equations of the pitching-heaving motions of buoy and energy conversion expressions are deduced with a wave incident angle of zero. Then the motion characteristics and power responses are analyzed. Calculations indicate that the heaving and pitching motions can be expressed as approximate simple harmonic motions with wave period. The wave circular frequency and draft of buoy have obvious influences on the amplitude-frequency responses. When the draft is larger than 1.0 m, the curves of heaving motion exhibit single-peak patterns and the peak values are discovered at the circular frequency of about 2.5 rad/s. The amplitude-frequency responses of pitching motion share the similar trends, and the peak amplitudes change regularly with draft and circular frequency. The heaving motion and pitching motion together influence the conversion power. For the cases in this paper, larger draft can increase the conversion power on the whole. According to the power contribution of pitching motion, the rates of conversion power of pitching motion usually exceed 20%. Therefore, the conversion power of traditional oscillating buoy WEC is expected to be improved effectively by absorbing the energies of multiple freedoms.

Motion Analysis and Power Responses of a Single-buoy Wave Energy Converter Consisting of Double Hydraulic Cylinders