板狀結(jié)構(gòu)的流致振動(dòng)與穩(wěn)定性研究.pdf

1、分類號(hào)UDC密級(jí)編號(hào)南華大學(xué)碩士學(xué)位論文板狀結(jié)構(gòu)的流致振動(dòng)與穩(wěn)定性研究研究生姓名：指導(dǎo)教師姓名、職稱：學(xué)科、專業(yè)名稱：研究方向：崔振東郭長(zhǎng)青教授結(jié)構(gòu)工程結(jié)構(gòu)的流固耦合2005年5月r787819StudyonFlow—inducedVibrationandStabilityoftheParallelplateStructureAbstractFluid—structureinteractiondynamicproblemsinparal

2、lelplatestructurescanbeoftenmetinmanyfieldsanditisadifficultproblemthatshouldbesolvedquicklyTheparallel—plateassemblyisanewtypefuelelementinnuclearreactorsItsflow—inducedvibrationandstabilityarestudiedinthisthesisAmodelo

3、fmulti—parallel—beamsjoinedwithsinglebeamisadoptedinthetheoreticalanalysisofthenaturalvibrationcharacteristicsoftheparallel—plateassemblyinthestudyoftheoreticalcalculationandanalysisonthewetmodalnaturalfrequenciesandmode

4、s，thedrymodalmodefunctionsareusedastrialfunctionstosolvethecomplex—modalmodeequationbyvariationalmethodInthestudyofstabilityoftheparallel—plateassemblyitscriticalflowvelocityanddestabilizingdeflectionareanalyzedandcalcul

5、atedbydirectmethodandvariationalmethod，andtheresultsofthetwomethodsagreewitheachotherInthestudyofflow—inducedvibrationandstabilityoftheparallelplateassemblywithnonlinearsupport，thestabilityofsteady—statesolutionneartheeq

6、uilibriumpointsisanalyzedbyusingthetheoryofstabilityInthestudyofflowinducedvibrationexperimentontheparallel—platestructure，electricmagneticmethodisusedtomeasuretheflow—inducedvibrationofthesingleplateandtheparallelplateT

7、hroughtheoreticallyanalyzing，calculatingandexperimenting，someconclusionsaredrawnasfollowsInthedrymodal，oddordermodecurvesoftheparallelplatestructurearesymmetricmodal，butevenordermodecurvesareasymmetricmodalFlow—inducedvi

8、brationoftheparallel—platestructureisofcomplex—modalcharacteristicsThenaturalfrequencyofanyorderdecreaseswithincreasingflowvelocitySymmetricmodalandasymmetricmodalarenotstrictlyarrangedalternativelyCriticalvelocityincrea