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1、EARTHQUAKEENGINEERINGANDSTRUCTURALDYNAMICSEarthquakeEngng.Struct.Dyn.28,1121}1141(1999)REAL-TIMEHYBRIDEXPERIMENTALSYSTEMWITHACTUATORDELAYCOMPENSATIONANDITSAPPLICATIONTOAPIPINGSYSTEMWITHENERGYABSORBERT.HORIUCHI1,*,M.INOUE1,T.KONNO2ANDY.NAMITA11MechanicalEngineeringResearchLaboratory,HitachiLtd,502
2、Kandatsu-machi,Tsuchiura-shi,Ibaraki-ken,300-0013,Japan2TsuchiuraWorks,HitachiLtd,603Kandatsu-machi,Tsuchiura-shi,Ibaraki-ken,300-0013,JapanSUMMARYAreal-timehybridexperimentalmethod,inwhichoutputfromanactuator-excitedvibrationexperimentandresponsecalculationarecombinedon-lineandconductedsimultane
3、ouslyinrealtime,isbeingdevelopedasanewseismicexperimentalmethodforstructuralsystems.Inreal-timehybridexperiments,however,thereisaninevitableactuator-responsedelay,whichhasane!ectequivalenttonegativedamping.Tosolvethisproblem,areal-timehybridexperimentalsystem(includinganactuator-delaycompensation
4、method)wasdeveloped.Andseismicexperimentswereconductedinordertodemonstratetheadvantagesofthissystem.Experimentalresultsobtainedusingthedevelopedhybridexperimentalsystemwerecomparedwithexactresultsobtainedusingshaking-tableexperiments,anditwasfoundthatthetwoexperimentalmethodsgavealmostidenticalre
5、sults.Itcanthereforebeconcludedthatthestructuralresponsecanbeobtainedpreciselybyusingthedevelopedhybridexperimentalsystem.Comparisonoftheseexperimentsshowedtheadvant-agesofthehybridexperiments;thatis,theyaresimpleandeconomical.Thisisbecausethehybridexperimentrequiresonlyasmallstructureastheexcita
6、tionmodel,whileashaking-tableexperimentmustconsiderthewholestructuralsystem.Copyright(1999JohnWiley&Sons,Ltd.KEYWORDS:seismicexperiment;hybridexperiment;pseudo-dynamicexperiment;realtime;hydraulicactuator;delaycompensation1.INTRODUCTIONTheseismicresponseofastructuralsystemisusuallyevaluatedbyusin
7、gashakingtable.However,duetotable-capacitylimitations,shaking-tableexperimentsforlarge-scalestructuresaresometimesdi$cult.Asasolutiontothisproblem,Hakunoetal.1proposedaseismicexperimentalmethodinwhichanactuator-excitat
