基于橋梁GPS監(jiān)測數(shù)據的頻域分析.pdf

1、同濟大學土木工程學院碩士學位論文基于橋梁GPS監(jiān)測數(shù)據的頻域分析姓名：黃川申請學位級別：碩士專業(yè)：大地測量學與測量工程指導教師：沈云中20080101AbstractABSTRACTGPShasbeenwidelyusedinhealthymonitoringofbridgesinceitcancollectall—weatherhighresolutionandhighprecisiondeformationdata11heGPSti

2、meseriesobservationsformonitoringbridgedeformationarethemulti—frequencycombinedsignalsThewidelyusedmethodsforprocessingtimeseriesdatamainlycontaintwopartscalledtimedomainanalysisandfrequencydomainanalysisThetimeseriesGPS

3、monitoringdataofDonghai—BridgearcfirsttransformedintofrequencydomainbyFouriertransformmethod，thenwiththeheIpofspectrumanalysisandwaveletsanalysis，theperiodicalsignalsarcdistilledandanalyzedforthebridge’Shealthstatus，nlem

4、aincontentsofthepaperareshownasfollows：1ThispaperSlimsupthepresentstatusofresearchandapplicationabouthealthmonitoringsystemofbridgeandmainmethodsoftimeseriesdataprocessingaresummarized2GeneralflameandGPSsystemofhealthmon

5、itoringsystemisintroducedcomprehensivelycombinedwithdesigndocumentofDonghai—Bridge3LowfrequencyanalysisofGPSmonitoringdataonDonghsi—BridgeThetimeseriesdataaletransformedLntofrequencydomainPeakfrequencyanditscorresponding

6、magnitudeandoriginalphasea∞distilledandthenmainperiodicaldeformationsofthebridgewiththeperiodofon瞎orhalfdayaleanalyzedMeanwhile，signalwiththeperiodofhalfdayisdiscussedbymodeling4ModeanalysisofbridgestructureSelfvibration

7、frequencyisextractedundertherandomstimulationofthe10adThemagnitudeofselfvibrationiscentimeterlevel，whiletheaccuracyofGPSdataismillimeterlevelWiththehelpofwaveletsanalysis，thedataiscompressedwithinthescopeofselfvibration，

8、sothespectrumanalysiscouldbeachieved5RcspondcnceofthebridgeisrelevantwithitsmechanicscharacteristicAfterthetwicedifferentialsofthedatawithinthescopeofselfvibrationwecouldobtaintheaccelerationdatawhichisusedindiagnosisoft