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1、天津大學(xué)碩士學(xué)位論文矩形殼液耦合系統(tǒng)低頻大幅波的分析姓名：徐景滿(mǎn)申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：一般力學(xué)與力學(xué)基礎(chǔ)指導(dǎo)教師：劉習(xí)軍20070101ABSTRACTAsSOmanyengineeringstructuresarcworkingorrunninginhydromedium，variousliquid—solidcoupledquestionfordiscussionarceme唱edconstantlyInadditiontheac

2、tionofthenonlinearfactorsintheliquidsolidcoupledsystemafebeyondignoringitisofgreatvaluetostudythenonlinearvibrationoftheliquidsolidcoupledsystemThepaperisonthephenomenonoflowfrequencyandlargeamplitudegravitywavesofcouple

3、dliquidandelasticshellsystemwhichwereinspiredwiththeexcitingforceAccordingtotheappearanceofthegravitywavesandthedataofthewavesandtheparameterofthesystemmode，thereasonsandthefeaturesofthegravitywavesaswellastheinfluenceof

4、theexcitingforcetothegravitywavesareresearchedbymeansofnumericalandanalyticmethods1Basedontheexperimentalphenomenonthatthelowfrequencyandlargeamplitudegrayitywavesmaybegeneratedbythehighfrequencyexternalexcitationintheli

5、quidelasticshellcoupledsystem，asetofnonlinearequationsforthemultidegreeoffreedomsystemisconstructedapplyingthecorrelativetheoryofhydrokineticsandelasticity2BymeansoftheRangeKuttamethod，thenumericalsolutiontothenonlineare

6、quationsiscarriedout，thetimehistorycurvesandfrequencyspectrumcurvesareobtained，therelationsbetweenthechangedamplitudeofthegravitywavesandalteredfrequencyandamplitudeoftheexteriorexcitingforcearefoundwhichcouldexplainthep

7、reconditionoftheemergenceofthewaveswelltheconclusionsareconstituentwithwhatdrawnfromtheexperiment3Dependingontheconclusionsofthenumericalsolutions，asetofnonlineardifferentialequationsforthetwo—degreeoffreedomsystemissolv

8、edaccordingtotheanalysisoftheapproximatestationarysolutionofthefirstorderwecouldfindthattheanalyticresultsaregoodagreementwiththenumericalconclusions4Themodesofrectangularshellandtheliquidelasticshellcoupledsystemandthew

9、aterwereanalysedwithFEMmethod，theresultswhichdrawnfromtheanalysiswithFEMmethodarewellconstituenttotheresultoftheexperimentationBymeansofnumericalandanalyticmethodsandFEMmethodthegravitywavesgeneratedbythehighfrequencyext

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