This work applies fuzzy structure theory to shock response predictions for equipment in COTS electronics cabinets at the shelf or drawer level. The developed methodology is applied using standard commercial finite element codes in the time domain. The approach is demonstrated to be capable of producing accurate predictions with much less modeling effort and computational time than would be required using a conventional detailed finite element model of the structure. This fuzzy structure technique provides a means for the analyst to introduce frequency dependent damping in the linear time domain and to include the effect of dynamic mass on the cabinet behavior. By introducing statistical ranges to the properties of the fuzzy structure, this approach can bound the uncertainty associated with these types of predictions.
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