基于有限元法的螺旋型旋耕刀輥橫刀工作機(jī)理研究.pdf

1、華中農(nóng)業(yè)大學(xué)碩士學(xué)位論文基于有限元法的螺旋型旋耕刀輥橫刀工作機(jī)理研究姓名：周明申請學(xué)位級別：碩士專業(yè)：農(nóng)業(yè)機(jī)械化工程指導(dǎo)教師：張國忠20090601AbstractAbstractFurtherresearchofsoilcuttingproblem，inwhichsomemethods，suchasthestaticofrigidbodymethod，thedimensionanalyticmethodandtheplasticlim

2、itbalancemethod，wereusedtoforecastingthecuttingresistanceandmadecertainprogress，isoneofimportantsubjectsintherecentthreedecadesHoweverduetotherespectiveexistentlimitationandinsufficiencyofthemethods，researcherswereunable

3、toobtainthecompletequantitativeanalysisresultInrecentyears，therapiddevelopmentofcomputertechnologyaswellasthedevelopmentandutilizationoffiniteelementsoftware，havemadenewprogresstotheresearchofsoilcuttingproblemThisthesis

4、basedonthefiniteelementsimulationtechnologymainlystudiedsoilcuttingprocessofspecificstickysoilAndtestswerecarriedouttovalidatetheresultofdynamicnumericalsimulationThemaincontentincludes：(1)Finiteelementanalysismodelofsoi

5、l—cuttingproblemwithtransverseknifeonhelicalrotaryburystalkrollerafteranalyzingthecharacteristicsofthecuttingprocess，wasestablishedwithelastic—plastictheoryMoreover，Lagrangeincrementalmethodwasusedtodealwiththegeometricn

6、onlinearproblemofthesoil—cuttingprocess，andrevisednonlinearelasticplasticDruckerPragermodelwasutilizedtosimulatethesoilcuttingprocessandgetsomeparameters，suchasstressdistribution，cuttingresistanceandshearanglebetweensoil

7、andtransverseknife(2)Theanalysisresultsshowed，whennarrowtransverseknifewentcompletelyintothesoil，increasedcuttingspeedandanglecouldmakelargercuttingresistance，betweenwhichtherelationshipwerenonlinearwhilesoilcuttingdepth

8、hadlittleeffectonthecuttingresistance，andtherewasalinearrelationshipbetweencuttingtractionresistanceandsoilcuttingwidth(3)Changesaboutequivalentstressandthethreedirectionsmechanicalpropertiesofthehelicaltransverseknifewe

9、reindicatedinthethreedimensionalsimulationofsoilcuttingprocess，providethebasisforoptimalstructuralparametersofthehelicaltransverseknife(4)Ifthecuttingspeedwaslowerthanlm／s，thecuttingangle，comparedwithcuttingspeed，hadlarg

10、ereffectonthecuttingresistance，aswellasthesoilcuttingdepthhadnoobviousinfluenceonthecuttingresistance(5)Itwasfoundthat，bycomparingthesimulationandtest，theresultofshearanglewassimilarandtheerrorbe錒eensimulationresistancea