結構阻尼時域識別方法的研究.pdf

1、武漢理工大學碩士學位論文結構阻尼時域識別方法的研究姓名：楊劍輝申請學位級別：碩士專業(yè)：結構工程指導教師：李書進20071101武漢理工大學碩士學位論文AbstractVibrationModalanalysisandparametersidentifyisoneactivityembranchmentofvibrationengineeringItisthefoundationofstructure’sdynamicdesigning，

2、decreaseandeliminatesvibrationandcontrolvibrationVibrationModalanalysisandparametersidentifyisananalysismethodwhichisusedin“athwartquestion’’intheStructureDynamicsItisusedtosolvethestructures’problemsbyassociativeexperim

3、entswiththeoreticanalysisSofaritisabroadappliedintheprojectdomainanditisbecomingimportantshifttosolvestructure’problemsThegoalofModalanalysisistoidentifymodalparameterstoanalyzesystemofstructures’vibrationcharacteristicf

4、aultdiagnosisandforecastinordertoprovide舀sttooptimumdesigningStructuresModalParametersincludemass，rigiditydampingwecanidentifythembymodalanalysisextractiontechniquesBecauseitsthemosthardtobeidentifiedandtheproblemsbrough

5、tbydampingareimportantonflamedesignortooptimizestructuredesignManyresearchershavedevotedtheirworktothedevelopmentofmodalanalysisextractiontechniquesinordertoobtainmorereliableidentificationofthemodalparametersThereareman

6、ydampingidentificationmethods，buteachonehasdifferentmeritanddefectInordertofindwhichoneisthemostreliablemethodwithrespecttocertaincharacteristics，thisthesisfocusonhowtoidentifystructure’sdampingintimedomainThefollowingwo

7、rkshavebeendoneinthisthesis：1Fourmodalanalysismethods———_theLSCEMethodtheIbrahimTimeDomainMethod，theTimeDomainCollectivityModalParameterMethodsandtheRationalFractionPolynomialMethodarecollectedtobeinvestigateinthethesis2

8、Usingthefourmethordstoidentifythemodaldampingwithappropriatedynamicsmodalandprotractrelevantplots3Comparetheresultsidentifiedbythefourmethodsandinvestigatehowthedampingratioestimationisaffectedwithrespecttoeachmethodindi