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含旋转运动效应裂纹梁横向振动特性的研究.docx

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含旋转运动效应裂纹梁横向振动特性的研究 Title:StudyontheTransverseVibrationCharacteristicsofaCrackedBeamwithRotationalMotionEffect Abstract: Cracksarewidelyacknowledgedascommonstructuraldefectsthatmaysignificantlyaffectthedynamiccharacteristicsandstabilityofengineeringstructures.Inthisstudy,wefocusoninvestigatingthetransversevibrationcharacteristicsofacrackedbeamsubjectedtorotationalmotioneffect.Theresearchaimstodeepenourunderstandingofthedamagedetectionandanalysismethods,providinginsightsintothebehaviorofcrackedbeamsundersuchcircumstances. Introduction: Structuralhealthmonitoringisofparamountimportancetoensurethesafetyandintegrityofengineeringstructures.Cracks,asoneofthemostprevalentformsofdamage,canunderminethestructuralrobustnessandleadtocatastrophicfailuresifundetectedornotwellunderstood.Analyzingthevibrationbehaviorofcrackedbeamsiscrucialforstructuralevaluationanddamagedetection.Moreover,consideringtherotationalmotioneffect,whichisfrequentlyencounteredinreal-lifescenarios,addscomplexitytotheproblemandrequiresamorecomprehensiveresearchapproach. Methodology: Toinvestigatethetransversevibrationcharacteristicsofacrackedbeamwiththerotationalmotioneffect,anumericalanalysisapproachisemployed.Theanalysisisconductedusingthefiniteelementmethod(FEM),whichaccuratelyrepresentsthemechanicalbehaviorofthebeam.Additionally,therotationalmotioneffectissimulatedbyapplyingarotationaldisplacementtothebeam'sboundarynodes.Differentcrackconfigurationsandsizesareconsideredtostudytheirinfluenceonthevibrationcharacteristics. ResultsandDiscussion: Thetransversevibrationresponseofthecrackedbeamundertherotationalmotioneffectisanalyzed,focusingonparameterssuchasnaturalfrequencies,modeshapes,andmodeshapes'evolutionwiththecracksize.Itisfoundthatthepresenceofcracksinduceschangesinthemodalparameters,includingfrequencyshiftsandmodeshapedistortions.Therotationalmotioneffectfurtheraltersthesechanges,causingadditionalvariationsinthemodalparameters.Theresultsdemonstratetheimportanceofconsideringrotationalmotioneffectsina