履帶起重機起升機構閉式液壓系統(tǒng)仿真研究.pdf

1、大連理工大學碩士學位論文履帶起重機起升機構閉式液壓系統(tǒng)仿真研究姓名：于春宇申請學位級別：碩士專業(yè)：機械電子工程指導教師：趙福令20081201履帶起重機起升機構閉式液壓系統(tǒng)仿真研究SimulationStudyonClosedHydraulicSysteminHoistingMechanismofCrawlerCraneAbstractCrawlercraneisakindofwidelyusedofmobilehoistingequi

2、pmentAsoneofthemostimportantmechanismsofcrawlercrane，thedynamicpropertiesofhoistingmechanismdirectlyaffecttheworkingperformanceofthewholemachineAtpresent，mostoftheinternationalmanufacturershaveadoptedtheclosedhydraulicsy

3、stem，howeveronlyasmallnumberofdomesticproductsusedinsuchacontrollingwayThatisbecausetheclosedhydraulicsystemusedinthehoistingmechanismisstillatthetryingdesignstageandlacksthetheorysupportSousingthehydraulicsystemsimulati

4、onanalysismethodstosolvingthekeyproblemsduringthelargecrawlercranesdesignisofgreatsignificanceInthispaperthedynamicsimulationstudyonthedosedhydraulicsysteminthehoistingmechanismisonthebackgroundofthesubject1250tcrawlercr

5、ane，whichisjointlydevelopedbyschoolofmechanicalengineeringofDUTandFotonLovolInternationalHeavyIndustriesCo，Ltd(1)Basedonthestudyoftheclosedhydraulicsystemprincipleandthecharacteristicsoftheclosedhydraulicsystem，thekeytec

6、hnologiesoftheclosedhydraulicsystemappliedinthehoistingmechanismareputforward，andthestudyfocusofthispaperissummedup(2)Thehydraulicprincipleofthehoistingmechanismof1250tcrawlercraneisdesignedAccordingtothecalculationresul

7、tsofselectionconditionofthehoistingmechanism，thecomponentsareselected(3)Consideredforthenonlinearitiesofthehydraulicsystemandthebulkmodularthefeaturesofthesubsystemsinthehoistingmechanismareanalyzed，andthebondgraphmodels

8、ofthevariabledisplacementpump，theauxiliarypump，thehydraulicmotoretcarebuiltupThenaccordingtotheinteractionbetweensubsystems，thebondgraphmodelofthewholemechanismisdeveloped(4)Basedonthe20siresimulationsoftware，thebondgrap

9、hmodelofthehoistingmechanismwjtllclosedhydraulicsystemisbuiltup；andtheparametersandconstraintsareset。Finally，themodelsolutionisachieved(5)Usingthesimulationresults，firstly，theinfluenceofthesuctionpressureisanalyzed；secon

10、dly，thepressurememorycontrolisdetailedlystudied，theparametersoptimizationinthepressurememorycontrol，theinfluenceoffluctuationsofthememorypressure，andtheinfluenceoftheloadchangetotheoptimizationresultsarediscussed；thirdly