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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