基于小波分析和虛擬儀器的管道泄漏檢測研究.pdf

1、西安石油大學碩士學位論文基于小波分析和虛擬儀器的管道泄漏檢測研究姓名：蔡培升申請學位級別：碩士專業(yè)：機械電子工程指導教師：吳偉20080520英文摘要Subject：Specialty：Name：Instructor：ResearchofOilPipelineLeakageDetectionBasedonWaveletAnalysisandVirtualInstrumentsMechanicalEelectronicEngineerin

2、gCaiPeisheng(signatureWuWei(signature)W“w劬AbstractInordertoguaranteethesafeoperationofpipelineandminimizethelosscausedbyleakageaccidents，itisnecessarytostudytheleakagedetectingtechnologyandthekeytechnologyistodetectthele

3、akagerapidlyandreliablyaswellasreturntheleakagerangeanddegreeaccuratelyPipelineleakagedetectionisamultifieldobject，whichincludesmanysubjectssuchaspipelinehydrodynamics，thermodynamics，sensortechnologysignalprocessingandco

4、mputertechnologyTheleakagedetectiontechnologybasedonnegativepressurewave，waveletanalysisandvirtualinstrumentisresearchedthoroughlyinthisdissertationThemaineffortsCanbesummarizedasthefollowingaspects：1Thetrendofpipelinetr

5、ansportationdevelopmentandmethodsofpipelineleakagedetectionisintroducedandcomparedThenegativepressurewavemethod，whichisutilizedtodetectleakageonoilfieldsinOurcountryisselectedasthemainresearchobjectThepaperpointsoutthede

6、fectsoftheconstantpressurewavevelocityandanalyzesthechangerulesofliquid’Stemperaturealongthepipeline’Sdistance，indicatingtemperaturechange’SinfluenceonnegativepressurewavevelocityThemethodofeliminatingdynamicresponsetime

7、intervalofpressuresensorinstalledonthebotllendsofpipelineisputforwardandGPSisusedtosynchronizethetimeofthedataacquisitionsystemonthebotllendsThen，theformulabasedonnegativepressurewaveisimproved，andtheintegralnumericalcal

8、culationRombergarithmeticaswellasthedichotomyisusedtosearchtheleaksiteofthepipelineThepracticalcomplexsituationinfluencesondetectionresultisanalyzedandthesolutionbasedondoublesensorsandpressurefluxjointjudgementisusedThe

9、refore，theerroralarmprobabilityisreduced2SignalprocessingbasedonwaveletanalysisisresearchedThepipelinepressuresignalisdenoised，thedenoisingexperimentissimulatedinMATLABandtheresultsofwhichindicatetheSNRisimprovedThepaper

10、discussestherelationbetweenwavelettransformandsignalsingularityUsingit，thebreakpointofthepressuresignalwhenleakageOCCurSCanbedetectedInthiswaythetimeintervalofthepressurewavetobothendsofthepipelineisascertainedprecisely3