Through the collision analysis on the typical main member of floating wave power generating device, we calculate the impact energy absorption of the structure in the collision situation. The ship is assumed to collide head to the weakest brace. Conservation of the energy requires that the kinetic energy of the impacting ship is transferred into the elastic deformation energy and the plastic dissipation of energy in ship and platform. The load-displacement curve, including the geometrical and material nonlinearities for a given load, is obtained. The absorbed energy is calculated by integrating the area under the curve in the load-displacement relations. We carried out the collision analysis of the FWPGD based on the FEM analysis through the ANSYS LS-DYNA. Comparative study between rigid-plastic method and FEM analysis results were carried out to determine the credibility of the analysis methods. Resulting in the provision of the safe analysis approach guidelines for the floating wave power generating device in collision situations.

impact load, wave power, finite element method, load-displacement curve, risk analysis.