桥梁tmd系统的参数优化与设计

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1、工程硕士学位论文AbstraetBridgestructuresarepronetovibrationproblemsunderexternaldynamicexcitationslikewinds，earthquakeandpassingcrowds．Excessivevibrationscanresultincomfortlessnesswhenvehiclesandcrowdspassingby，meanwhile，structuralelementsmayalsosufferfromhighriskoffatigu

2、efailure．ManyinvestigationshavebeencarriedoutformitigatingvibrationsandTunedMassDamper(TMD)isoneofthemostwidelyusedmethods．Inthisstudy，investigationsaremadeoftheparametricoptimization，robustnessandreliabilityanalysisofvibrationcontrolbyusingbothSingleTunedMassDamp

3、er(STMD)andMultipleTunedMassDamper(MTMD)inthepresenceofstructuraldampingandmodelinguncertainty．ApedestrianbridgeinMianyangcity，SichuanisusedtoillustratethemitigatingeffectoftheTMDsystems．Themainresearchcontentsandachievementsareintroducedasfollows：(1)Anintroductio

4、nofbridgevibrationsandmethodsofvibrationcontrolaresummarized．andtheTMDcontroltheoryisreviewedandthemainworkofthethesisisoutlined．(2)TheoptimalparameterofSTMDconsideringstructuraldampinginmainstructureisobtainedbyusinganumericaloptimizationmethod，andtherelativedisp

5、lacementbetweenTMDandtheattendantstructureiSalsoformulatedinthispaper．ItisshownthattheestimationformulaofTMDrelativedisplacement，asderivedbyDenHartogbasedontheconceptthattheenergydissipatedbytheTMDisequaltotheworkdonebytheappliedloads，ismerelysuitabletocalculateTM

6、Drelativedisplacementintheresonanceregion(O．9

7、timalparameterofMTMD．ThenumericalresultsshowthatMTMDoutperformsthanSTMDintermsofcontrolefficiencyandwiderfrequencycontrolrange．InthesamemassratioofMTMD，thecontrolperformanceisenhancedforincreasednumberofTMDunit，andtheoptimaldampingofeachTMDunitisdecreased，resultin

8、ginthelargerTMDrelativedisplacement．(4)AnanalysisofrobustnessbothonSTMDandMTMD，byalteringdynamicparametersofthecontrolledstructure，ispreformed．Analysiss