This study focuses on a built-in oscillating buoy-type wave energy converter (WEC). The device captures wave energy by leveraging the relative displacement between the internal buoy and the floater (i.e., a floating body exposed to waves). Within the framework of potential flow theory, the frequency-domain equations of motion are derived using the Lagrange multiplier method to assess the hydrodynamic performance of the system. Moreover, detailed parametric analyses are conducted to quantitatively investigate the effects of key parameters (e.g., the size of the main structure and power take-off damping and stiffness) on wave power extraction and the hydrodynamic responses of the device. The results offer valuable insights for optimizing the design of this kind of WEC.
Wang et al. (Sun,) studied this question.