An operational modal analysis method in frequency and spatial domain

(整期优先)网络出版时间:2005-02-12
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Afrequencyandspatialdomaindecompositionmethod(FSDD)foroperationalmodalanalysis(OMA)ispresentedinthispaper,whichisanextensionofthecomplexmodeindicatorfunction(CMIF)methodforexperimentalmodalanalysis(EMA).ThetheoreticalbackgroundoftheFSDDmethodisclarified.Singularvaluedecompositionisadoptedtoseparatethesignalspacefromthenoisespace.Finally,anenhancedpowerspectrumdensity(PSD)isproposedtoobtainmoreaccuratemodalparametersbycurvefittinginthefrequencydomain.Moreover,asimulationcaseandanapplicationcaseareusedtovalidatethismethod.