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1、上海交通大学硕士学位论文基于Hilbert-Huang变换的结构损伤检测研究姓名：丁麒申请学位级别：硕士专业：机械设计及理论指导教师：孟光20090201AbstractResearchonStructuralDamageDetectionbyHilbert-HuangTransformABSTRCTStructuraldamagedetectioncanhelptofullyunderstandthestateofstructuraldamageandthechangesofthecarryingcapacity.It’sofgreatsigni
2、ficantfordisasterpreventionandreduction.Thispapersummarizedthedevelopmentandthecurrentsituationofthestructualdamagedetection,putemphasisontheapplicationreviewofHilbert-HuangTransform(HHT)indamagedetection.Onthebasisofpreviousaccomplishment,thepaperaimedattherequirementofstruct
3、ualdamagedetection,tookfulladvantageofadaptivityandcapabilityofHHT,andwidenedthisnewsignalprocessingmethodfromtimedomaintospatialdomain,fromone-dimensionaltotwo-dimensionaltouseitinstructuraldamagedetection.ThepaperintroducedthebasictheoryandmethodofHHTindetail,summarizedtheal
4、gorithmofEmpiricalModeDecomposition(EMD),clarifiedthethephysicalsignificanceofHilbertspectrumanalysis,discussedsomeproblemsofEMD,suchastheendingeffect,orthogonalityandcompleteness,frequencyresolutionect.,andprogrammedthecorrespondingalgorithm.Accordingtothedefinitionandcharact
5、eristicsofsignalsingularity，thepaperanalysedthetheoryofsignalsingularitydetectionbyHHT,introducedtheEEMDmethodtoHHT,madeuseofitsimprovementonmodemixing,enabledittobecomeaeffectivetoolforsignalsingularitydetectionbydecompositionintimedomainandtransforminfrequencydomain,appliedt
6、hemethodtoASCE’sbenchmarkStructuralHealthMonitoringproblems,identifiedthetime,locationanddegreeofdamage.ThepaperalsoderivedthemodalshapechangesofdamagedEuler-Bernoullibeamandthinplate,putforwardspecial1-Dand2-DHHTmethod,utilizedmodesingularitycausedbydamage,advancedrelevantdam
7、ageindex,detectedthelocationanddegreeofdamagedbeamandplate,validatedthemethodeffectivitybymodaltest,discussedtherelationshipofdamageindexanddamagedegreeunderdifferentmodal.Forcrackdetection,thepaperestablishedcrackedcantileverbeamequivalentSDOFIIAbstractmodelandfiniteelementmo
8、delwithcontactpair,analysedthenonlinearcharacteristicsofrespo
