Abstract

Recently, a number of investigators have proposed so‐called energy flow analysis techniques to allow engineers to perform high‐frequency structural vibration studies of coupled structural elements. One key parameter required for this analysis is the power transmission and reflection coefficients of the joints that couple structural elements. A wave‐number domain technique has been developed which uses a spatial fast Fourier transform to transform velocity data obtained in the spatial/frequency domain into the wave‐number/frequency domain. The resulting wave‐number domain spectrum allows estimation of energy flow segregated into right and left traveling components. Using the segregated energy flows for all of the structural elements coupled at a joint, it is possible to estimate the power transmission and reflection coefficients of the joint. A ladder frame structural system is analyzed to determine the flexural wave power transmission and reflection coefficients of ell‐ and tee‐joints that comprise the structure. The structure is forced so that only flexural and longitudinal waves are excited. A scanning laser Doppler vibrometer is used to collect the flexural wave velocity data. The estimates of the joint coefficients are presented and compared to the analytical values for rigid joints.

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