Inthispaper,abeam-platecoupledstructureisdiscussed.Thederivationofexactexpressionsforpowertransferandnumericalcomputa-tionarecarriedon.ItisfoundthattheSEAtechniquesmaybeappropri-ateforstrongcoupledstructuresandthatthegeneralSEAresultprovidesgoodagreementwiththeexactcalculationwhenmodaloverlapishigh.Thederivedformulaisappliedtopredictthecouplinglossfactorandvibrationalenergyofsubstructures.Theagreementbetweentheestimatedandmeasuredresultspresentsquitewellinmostcases.