结构构件阻尼特性的分析

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1、AbstractDampingisoneofthenaturaldynamiccharacteristicsoftheengineeringstructures.Ithasgreatinfluenceonthedynamicresponsecharacteristics,especiallyfortheflexiblestructures.Thedampingratioofstructuresisusuallyobtainedbytest.Currently,becauseofthelargediscretenessandstrongrandomnessofthedampingra

2、tiointhetest,theconstantdampingratiomodeliswidelyusedinthenationalstandardathomeandabroad.Manyresearchesshowthatthedampingratiohasnonlinearproperties.Therearemanynonlinearresultsintheelastic-plasticstageandlessresultsintheelasticstage.Sothedampingratioisoftenconsideredasaconstantintheelasticst

3、age.However,someresearchesindicatethatevenintheelasticstage,thedampingratiohasthepropertiesofnonlinearity.Therefore,it’sbecomingmoreandmoreimportanttodecidethedampingratioaccuratelyandreasonablyandtoexplorethevariationofthestructuraldampingforthetheoreticalvalueandengineeringsignificance.Inthi

4、sstudy,inordertoexplorethedampingcharacteristicsintheelasticstage,arelativelyuniformandsimplesteelcantileverbeamelementisusedasthetestobject.Andthefreevibrationtestofthecantileverbeamiscarriedouttoinvestigatethevariationofthedampingratio.Accordingtothecurrentactualconditions,firstofall,thesame

5、eightcantileverbeamswithrectangularcross-sectionhavebeendesignedandmanufactured(calculationlengthis1m,crosssectionsizeis30mm×8mm).Secondly,themetallicmaterialstensiletestofthecantileverbeamatambienttemperatureiscarriedout.Whichisbasedonthenationalstandard《MetallicmaterialsTensiletesting》(GB/T2

6、28.1-2010).Andtheelasticmodulusandtensilestrengthofthecantileverbeamisobtained.Thirdly,basedontheexperimentalresultsofmaterialtestthecantileverbeamfreevibrationtestschemeisdesigned.Thenthevibrationtestunderdifferentinitialconditionsiscarriedout.Thedampingperformancetestisconductedbythefreedamp

7、ingmethodanditisbasedonthetestschemeofthecantileverbeamcomponent.Thepurposeistostudythevariationofdampingratioofthestructureinthefreevibrationandanalyzetherelationshipbetweenthevibrationamplitudeandthedampingratioofthecantileverbeaminth