problems of dynarnics in the Three

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1、ProblemsofDynamicsintheThree-GorgeShipliftLekangLiao,YangtzeRiverWaterResourceCommissionDuanweiShi,WuhanUniversityofHydraulicandElectricEngineeringKeywords:shiplifthoistship-tankdynamicscouple1.IntroductionTheThree-GorgeShiplift(TGS)isapermanentnavigationfacilityappliedintheThree-Gorgeproject.Itw

2、illworktogetherwiththedouble-linefivestepship-locks,sothatthenavigationcapacityoftheprojectcanbegreatlyincreasedandthequalityofnavigationbeassured.TGSisafullbalancingropehoistverticalshipliftwithmaximumhoistdistance113mandhoistweight11800tons.ThelargestshipliftofthiskindbeinginoperationnowisStrep

3、yShipliftinBelgiumwithitshoistdistance73mandhoistweight7750tons.ThevaryingamplitudeofwaterlevelupstreaminTGSis109manddownstream12m,withquickvaryingrateofwaterlevel.UnlikeStrepyshipliftwhichstopsonlyintwofixedpositions,TGSshouldstopinanypositionsinsomerangeofdistance.ThismakesTGSmorecomplicatedtha

4、nStrepyshiplift.InordertoassurethereliabilityofTGS,itisnecessarytostudydynamicsinTGS.TGSconsistsmainlyoftheupstreamchannel,theupstreamlock-head,amainhoistsystem,aship-tankofsteelstructureinwhichwaterisfilledandmanyapparatusareincluded,acounterweightsystemwhichbalancescompletelytheweightoftheship-

5、tankwithwater,anelectricdrivingandcontrolsystem,ropesandahydraulicbalancingsystemwhichkeepstheship-tankinhorizontalstateandmakesloadsofropesrollingrounddrumsalmostsame,fourtowerpillarstructuresofconcretewhichsupportthemainhoist,thedownstreamlock-headandthedownstreamchannel.ThetotallineofTGSisabou

6、t500mlong.Thepermanentfacilitywillcomeintooperationin2009.Whentheshipliftruns,shipsbeingreadyforcrossingthedamcomesintothewaterareaof9000tonsinship-tank.Theship-tankamon1gthefour-towerpillarstructureissuspendedby192ropesandliftedorlowedbyhoistalongtheguiderails.Thecounterweightsareconnectedtoship

7、-tankbyropesrollingarounddrumsandpulleysinthemachineroomintowertop.Thisprocedureiscalledasship-tanklift-lowingprocedure(SLLP).Whenthewatersurfacelevelofship-tankissameaswaterleveloflock-headsofupstream(ordownstream),al