Abstract
Previous work has been done on the prediction of the total loss factors of structures in steady state [1]. In this paper, the effective loss factors of coupled structures in quasi-transient conditions are considered, which are thought to be important parameters in the prediction of ringing noise radiated from impacting machines. SEA is used and Maidanik's arguments [2] are re-examined in analysis and discussion. A series of measurements have been carried out on two coupled plates (i.e., a structure having two substructures) and a randomly chosen complicated structure. An equation derived from the two coupled substructures model is used to estimate the effective loss factors of the two coupled plates. Good agreement is obtained between the estimated and measured values.
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