 Wysłany: Sob 0:54, 02 Kwi 2011 Temat postu: Ambient vibration system identification Comparativ |
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| Ambient vibration Comparison of system identification methods
9991O97-10 ∞ RenWX ( Ren Wei salary ), HarikJESeismicevaluationoftheTennesseeRiverbridon1-24HighwayinwestKentuek. v [RJ. Ken-tUCkyTransporta6onCenter. CoBngeofEngineering. UrdversityofKen ~ ekyt2001. ComparisonofsystemidentificationmethodsusingambientvibrationmeasurementsHW-xin (DepartmentofCivilEngineeringandh'echlreB, FnzhouUrdversity,p90x workout calendar, Fxmhou, F ~ ian350002.Ckir, a) Abstract: Thepaperisintendedtocomparesystemidentificationtechniquesforevaluatingthedynamiccharacteristicsofcivilengineeringstructuresfromambientvibrationdata. Twosystemidentificationtechniquesusedarethefrequencydomainbasedpeakpicking (PP) methodandthetimedomainbasedstochasticsubspaeeidentification (SSI) method. A15storeyreinforcedconcreteshearcorebuildingandasteelgirderarchbridgehavebeenchosenascaseverificationTheresultsdemonstratethatthePPmethodissimpleandfast. However, thedampingratioandmodeshapesarenotguaranteed. ThecomputationalloadoftheSSItechniqueissignificandyhisherthanthePPmethod, butthequalityoftheidentificationisalsohigher. TheSSItechniquewiththehelpofstabilizationdiagramcandetectcloselyspacedfre-quenciesthatarepossiblymissedwiththePPmethodandprovidesamorereasonableiEtod ~ shapeinmostcases. Forrealapplications, itissuggestedthatthePPmethodcouldbeusedOilsitetoverifythequalityofthemeasurementsandtohaveaquicklookattheoveralldyrmmicbehavioarofthestructure. AfterwardstheadvancedSSItechniquecanbeappliedtodetailortoensuretheresults. Keywords: systemidentification; ambientvibration; civilengineeringstructure; dynamiccharacteristicstmodalanaly-sis; dynanfictest234S6 |
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