A reduced-order model for the response of the pendulum shows the same behavior when initial clearance and focus location are varied. Although the energy of the wave input was the same for all experiments, the response of the pendulum varied greatly with small variations of initial vertical clearance and wave focus location, with the wave breaking farthest away from the pendulum causing the largest response.
The experiment varies the focus location with respect to the position of the pendulum as well as the vertical clearance between pendulum and mean free surface. The tube that makes up the base of the pendulum covers almost the entire width of the tank so that three-dimensional effects can be considered small. To study how an extreme wave load on a maritime structure causes structural deformation, an experiment is conducted to measure the response of a one degree-of-freedom pendulum in a focused, breaking wave.
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