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                2012   40   5 CHINAPETROLEUMMACHINERY — 57—            ( ( ) )    : , , 2 , 2 。 , , , ; , , , ; , , , 。    : ;; ;;; :TE951   :A   :1001-4578(2012)05-0057-04 AnalysisoftheCompensatingMechanismofSemiactiveDrill StringHeavingCompensationSystem ZhangMeng HuXiaodong LiBo (CollegeofMechanical&ElectronicEngineering,ChinaUniversityofGeosciences,Wuhan) Abstract:Applyingthed'Alembertprincipleandreferringtothemovementlawofdrillstring,theparalleland serialdynamicmodelsofsemiactivedrillstringheavingcompensationdevicewereestablishedThecompensating mechanismoftheparallelandserialsemiactivedrillstringheavingcompensationsystemswereanalyzedandcom paredThefindingsshowthatthefunctionofthepassivecompensationpartinthesystemistosupportmostofthe massofdrillstringandthatoftheactivecompensationpartistocompensatethevariationofvariousforcesThehy draulicsystemoftheparallelstructureisquitecomplexduetothefactthattherearemoreexecutingcomponentsin parallelstructurethaninserialstructureHowever,whenthegenerateddisplacementofthehullisremarkableand thecompensationloadrequiredbysubseadrillingisrelativelylarge,parallelstructureisbetterthanserialstruc tureTheparalleldrillstringheavingcompensationcanonl
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