Page 40 - 2025年第56卷第2期
P. 40
Effectiveparametersminingalgorithm forbrokenwiresignalsofprestressedconcrete
cylinderpipesbasedonprototypeexperimentandwrapperstrategy
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YANGGuang,LUANBowen,LIBo,SUNJin,ZHUZhaohui,ZHANGJianwei
(1.SchoolofWaterConservancy,NorthChinaUniversityofWaterResourcesandElectricPower,Zhengzhou 450046,China;
2.EngineeringSafetyandDisasterPreventionDepartment,ChangjiangRiverScientificResearchInstitute,Wuhan 430010,China;
3.CollegeofSurveyingandGeo - informatics,NorthChinaUniversityofWaterResourcesandElectricPower,Zhengzhou 450046,China;
4.EngineeringSafetyMonitoringCenter,ChinaInstituteofWaterResourcesandHydropowerResearch,Beijing 100048,China)
Abstract:Toenhancethecapabilityofdistributedopticalfibermonitoringsystemonreal - timebrokenwiresignal
detectionofprestressedconcretecylinderpipe(PCCP),thisstudyproposesawrappertheory - basedmodelfor
miningtheeffectivefeatureparameterswhichareconducivetoidentifyingPCCPbrokenwiresignals.Phasesensi
tiveopticaltimedomainreflectometry ( Φ - OTDR )monitoringsystemisusedtoobtainvibrationsignals,andtheo
riginalfeatureparametersetisestablishedbyconsideringtimedomain,frequencydomain,andtime - frequency
domain.Theimprovementstrategiesforwhaleoptimizationalgorithm(WOA)areestablishedbyemployingthenon
linearadaptiveweights ,thenonlinearconvergencefactor,theGaussianmutationperturbation,andtheTentchaotic
perturbation.ByintegratingtheimprovedWOA (IWOA)andthehierarchicalclustering(HC),theIWOA - HC
modelforeffectivefeatureminingisconstructed.Thefollowingresultsaredrawn.Fisher ,BPSO - HC,WOA - HC,
andIWOA - HCmine61,35,32,and27effectivefeatureparameters,respectively.Usingtheabovefourfeature
parametersetsforvibrationpatternrecognition ,theaccuracyratesare71.11%,86.67%,89.44%,and97.22%,
respectively.TheeffectivefeatureparametersminedbyIWOA - HChavethebestpatternrecognitionperformance.
Thisresearchprovidestechnicalsupportforhealthdiagnosisanddisasterwarningofin - servicePCCPengineering.
Keywords:prestressedconcretecylinderpipe;real - timebrokenwiremonitoring;prototypeexperiment;effective
parametermining ;wrappermodelling
(责任编辑:韩 昆)
(上接第 169页)
Researchonhydrauliccharacteristicsofaverticaldropshaftin
long - distancewaterconveyanceprojects
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LIUDa ,HUANGBensheng ,LIMing ,ZHANGJianmin,ZHANGLifang,QIUJing
(1.GuangdongResearchInstituteofWaterResourcesandHydropower,Guangzhou 510635,China;
2.GuangdongProvincialKeyLaboratoryofHydrodynamicsResearch,Guangzhou 510635,China;
3.SichuanUniversityStateKeyLaboratoryofHydraulicsandMountainRiverEngineering,Chengdu 610065,China)
Abstract:TheLiyuzhouDropShaftislocatedatthestartingpointofthewaterconveyancetrunklineoftheWater
ResourceAllocationProjectinthePearlRiverDelta.Itplaysadualroleindissipatingenergyofplungingjet
flows,aswellasprovidingtheheadforwaterconveyance.Whenwaterplungesintotheshaft,airentrainmentis
likelytooccur ,whichincreasestheriskofairintakeinthedownstream waterconveyancepipeline.Toaddress
thisissue,physicalmodelingatascaleof1∶10andnumericalsimulationanalysiswereconductedtostudytheair
entrainmentpatternsandthehydrauliccharacteristicsoftheflowintheLiyuzhouDropShaft.Basedontheanaly
sisofbubblemotion ,asemi - empiricalformulawasderivedtocalculatethemaximum penetratingdepthofthe
bubbles.Measurestoreduceairentrainmentintheshaftwerealsoproposed.Thestudyshowsthatundertheac
tionofplungingjetflows ,thewaterbodyintheLiyuzhouDropShaftisstratifiedwithanair - entrainingzone,a
transitionzoneandalow - disturbancezone.Andonlyinthetransitionzonedoestheairentrainmentconcentration
varywiththechangeinwaterdepth.Theextentofairentrainmentismainlyrelatedtofactorssuchasthefalling
flowdischarge ,thedropheight,thewatervelocityintheshaftandtheoverflow weirdiameter.Aftertaking
measuresofincreasingthediameteroftheverticalshaftby1.63timesandaddingabypasspipe ,theextentofair
entrainmentandtheaerationconcentrationweresignificantlyreducedintheLiyuzhouDropShaft.
Keywords:dropshaft;plungingjetflow;airentrainment;physicalmodeling;numericalsimulation
(责任编辑:鲁 婧 韩 昆)
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