A new hybrid type of ocean wave energy extraction system isintroduced and numerical investigations of the extraction system arepresented in this paper. The system consists of 3 components: floatingcylinder, pendulum plates, and fixed vertical support with a function ofself-controlling position. Because of a new system, hydrodynamicinteraction behaviors due to each component has been not clearlyclarified as well as pile-soil interaction due to those. From severalparametric analyses of the system on wave and soil conditions, changesin mechanical responses of the system were examined. Before theparametric analysis of pile–soil interaction under hydrodynamic waveloading, numerical tests for ocean wave generation were conducted toverify the numerical wave-maker in the study. Numerical investigations,with respect to changes in the initial soil deformable modulus and thestrength of soil, were then conducted. Through this study, it was shownthat stresses in the column of the wave energy extraction systemincrease as the initial soil stiffness and the strength decrease.
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