海底管道损伤检测及泄漏定位监测技术的研究

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1、分类号密级；Y989‘30⑧研究生学位论文海底管道损伤检测及泄漏定位监测技术的研究研雠瑟盔塑指导榭隘名奎坐里熬撞申请学t蝴别亟±专、】瞎称鲞旦二渔崖壁运渔王猩论文答辩日期!Q煎生!旦学位授予日期!鲤!生!旦一中国海洋大学海底簿邀臻穆捡涮及澄港定位蓝测接术鳇磷究StudiesouDamageDetectionandLeakageMonitoringandLocalizationofOffshorePipelineAbstractPipelineisthemajorwayoftransportingcrudeoil。Inrecentyear

2、s,磷氇therapiddevelopmemoftheoffshorepetroleumindustry,nlo他andmoresubmarinepipelineswerebuilt．LeakageoccasionallyOCCUl怎duetothecorrosionandmechanicaldamageete，duringtheservicelife,whichbringstheseriouslossofeconomyandenvironmentalpollution．Inordertoavoidtheseaccidents，itis

3、importanttolocalizetheleakageofthesubmarinepipelineassoonaspossible．Thereforethistopichasattractedmanycountries’attentionanditbeo饼粥theproblemwhichurgentlyneedstobesolved．Firstlythecorrodedanddamagedmechanismsofthepipelinesareanalyzed．Manykindsofdamagedetectionandleakagem

4、onitoringIlocalizationmethodsofthepipelinesaswella3theirworkprinciplesareintroduced．Theadvantagesandlimitationsofthemandtheirapplicablescopesalealsodiscussed,whichishelpfulto+theprojectpractice．Thus,severalmethodsofthemthat辩suitableforoffshorepipelinearcchosentostudyftlr

5、therandbringthereliablebasisfortheprojectdecision．Inthepaper,theexaminationandthemonitormethodsofpipelineleakageafemainlydiscussed．Themethodsbasedonthesothvareandthehardwareareanalyzed．indetail,includingtheiradvantagesandtheirapplicablescopes。Themethodbasedonthepressurew

6、aveischosenasthemonitoringmethodinthisinvestigation．Thetraditionallocalizationformulasofthepressurewavemethoda地modified．Anewiteratedalgorithmisproposedtoenhance：theaccuracyofleakageIocalizafion．Theleakagesignals粼processedbywavelettransformation。Thefluxmonitoringmethodisa

7、lsoadopted．Correspondingly,thecomprehensiveleakagelocalizationmonitorsystemisdeveloped．Thesystemenhancestheaccuracyandstabilityofleakagelocalization．Thewavelettransformationbasicprincipleisanalyzed，thewavelet珏海底管道损伤检测及泄漏定位监测技术的研究transformationisusedtoremovethenoiseandloc

8、alizethefeaturedinflecfionpointofthesignal．Itisobviousthatthemethodiseffectiveintheprocessofthepressure