This paper discusses coupled oscillating bodies used in wave energy absorption in deeper waters. In particular, systems using submerged reaction masses are considered using a frequency domain approach based on regular wave excitation. Approximate optimal reactive and resistive loads, and the corresponding capture width ratios are computed for a system of two vertically oscillating coupled axisymmetric bodies with an actuator operating between them. Results obtained over a range of frequencies indicate the advantages of dynamic coupling between oscillation modes. Such results could be used in adjustable “tuning” of 2-degree-of-freedom devices to different wave spectra for efficient energy absorption.

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