简介:Evaluationofthesound-structureinteractionisimportantforeffectivecontrolofnoiseandvibrationinstructuralacousticsystems.Crackedelasticstructure-soundinteractionproblemsarestudiedbyemployingthehybridfractalFEMandBEM.ThedegreesoffreedomofthesystemcanbereducedgreatlythroughadoptingfractalFEMindiscretizingthecrackedelasticstructure;whiletheexterioracousticfieldiscalculatedbyBEM,whichautomaticallysatisfiesSommerfeld'sradiationcondition.Numericalexamplesaregivenandshowthattheresonantfrequenciesofthestructure-acousticcoupledsystemdecreaseasthedepthofthecrackincreases,andthatthecrackhasasignificanteffectontheacousticalfieldinthevicinityofthecracktip.