The transmission of vibrational energy in a planar, three‐element plate/beam/plate structure is analyzed. Theoretical predictions of average energy (or acceleration) ratios in frequency bands are developed, using concepts of energy flow in multimodal systems that have been described previously. Interstructure coupling parameters are calculated for torsional and flexural motions of the central connecting member (beam), and the energy transfer contributed by each type of motion is also calculated. It is found that the energy transfer is dominated by beam flexure in the lower‐frequency bands, but torsional motion contributes significantly at the higher frequencies. Experimental analysis of a model of the structure is consistent with the theoretical predictions.

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