大跨斜拉橋拉索的參數(shù)振動及其控制.pdf

1、湖南大學(xué)碩士學(xué)位論文大跨斜拉橋拉索的參數(shù)振動及其控制姓名：陳丕華申請學(xué)位級別：碩士專業(yè)：橋梁與隧道工程指導(dǎo)教師：王修勇20090519碩fj學(xué)位論文AbstractDuetohighflexibilityrelativelysmallmassandverylowinherentdamping，small，staycablesoflong—spandbridgesaresusceptibletosignificantvibrationTh

2、evibrationandcontrolofstaycableisoneoftheresearchfocusesinbridgeengineeringThisthesisfocusesonparametricvibrationandcontrolofstaycablesinlongspanbridge(1Themainworksofthisthesisareasfollows：)Thisthesisreviewsvibrationand

3、controlofstaycableathomeandabroadOnthebasisofthisbackground，anin—planenonlinearvibrationequationofstayedcablemotionunderaxialdisplacementexcitationisestablishedbyGalerkinMethodSagofcable，inclinationangle，excitationamplit

4、ude，dampingcoefficientandetcareconsideredintheequationTheequationissolvedbyRunge—KuttaMethodInfluenceoffrequencyratio，excitationamplitude，dampingofcable，inclinationangleofcable，initialcableforcesandetconparametricvibrati

5、onofcablearediscussedUnstableregionofparametricvibrationofcablewithoutsagisderived(2)DynamiccharacteristicanalysisofEdongBridgeiscarriedoutStaycablesthatmayoccurparametricvibrationarefoundThepossibilityofcableparametricv

6、ibrationiSdiscussed(3)Anexperimentalmodelofstaycableisestablishedandtestedinlaboratory。InplaneparametricoscillationofthecableunderaxialdisplacementexcitationisobservedCableunderthreedifferentexcitationamplitudesandvariou

7、sfrequencyratiosiStestedTheresultindicatedthatitiSaccordwithnumericalcalculation(4)SimplifiedanalyticalmodelsreflectingthecouplinginteractionbetweenthestaycableandthedeckinparametricvibrationareestablishedandstudiedOnlyt

8、hefirstmodalofthestaycableisconsideredTheequationsarediscretizedbyGalerkinMethodAnd，theequationsaresolvedbyRungeKuttaMethodtoanalyzetheinfluenceoffrequencyratio，initialstateofsystemanddampingonsystem(5)Amathematicalmodel

9、ofcable—dampersystemisbuiltAnslysisoftheeffortsofviscousdamperonsuppressingtheinplaneparametricvibrationofstaycableisconductedKeywords：cablestayedbridge；parametricvibration；frequencyratio；GalerkinMethod；coupledvibration；