The motion response of the pendulum is demonstrated to depend highly on whether the wave period is much lower or higher than the dry natural period of the pendulum. Additionally a reduced-order model is derived to compute the response of the pendulum and help interpret the experimental results. We present an experiment in which a pendulum is suspended just above the still water level and then exposed to monochromatic free surface waves with different wave lengths. This paper aims to fill that knowledge gap. Although these conditions are typical for maritime applications, a fundamental experiment that includes a structure in the air–water interface undergoing transitions from dry to wet and back does not appear to exist. ![]() Maritime structures operating out at sea experience large changes in wetted area because of free surface waves.
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