hypermesh网格质量检测1

CheckingandEditingMesh-HM-3300Inthistutorial,youwilllearnhowto:•Identifyshellelementconnectivityproblems•Correctshellelementconnectivityproblems•Reviewthemodel’sshellelementstoensureconnectivityproblemswerecorrected•RemeshtheelementsalongtheribExerciseThisexerciseusesthemodelfile,cover.hm.Step1:RetrieveandviewtheHyperMeshmodelfile.Openthefilecover.hmlocatedintheinstallationfolder\tutorials\hmdirectory.Step2:Reviewthemodel’sfreeedgestoidentifyshellelementconnectivityproblems.1.Accesstheedgespanelinthefollowingways:•FromtheMenuBar,selectMesh,thenselectCheck,thenComponents,thenEdges•Fromthemainmenu,selecttheToolpage,andthenclickedges1/12HyperMeshHyperMeshTutorialsQualityCheckingandEditingMesh-HM-33002014/9/3file:///D:/Program/HyperMesh/help/hm/hm3300.htm•PresstheSHIFT+F3keys2.Withthecompsselectoractive,clickanyelementinthegraphicsarea.Thecomponentcontainingtheelementisselected.3.Clickfindedges.Red,1-Delementsaredisplayed.Theyareorganizedintothenewcomponentnamed^edges.Ared1-Delementiscreatedalongeachshellelementedgethatisfree;oneormoreoftheelementedge’snodesisnotsharedbytheadjacentelements.Note:Foracomponentnamewhosefirstcharacteris^,thecomponentanditscontentsisnotwrittentotheinputfilewhenthemodelisexported.4.ClickShadedElementsandMeshLines().5.Observethered,1-Delements(freeedges).6.Trytoidentifygapsinthecontinuityofthemesh.Hint:Lookcloselyatfreeedgesinteriortothemodel.7.IntheModelbrowser,turnthedisplayonandoffforthecomponentshellstocontinuetoidentifywhichred,freeedgesdonotbelong.8.Turnonthedisplayforthecomponent,shells.Step3:Correcttheshellelementconnectivityproblemsusingtheedgespanel.1.Inthetolerance=field,type0.01.2.Selectanelementinthegraphicsareatoselectthecomponent.3.Clickpreviewequiv.Thestatusbardisplaysthefollowingmessage:81nodeswerefound.Asphere,,iscreatedonnodeshavingadistancebetweeneachotherequaltoorlessthanthespecifiedtolerance.4.Noticethatforthisexercise’smodel,asphereisnotcreatedoneverynodealongallofthered,freeedges,whichdonotbelong.Alargertolerancemustbespecifiedtoidentifytherestofthenodes.5.Fortolerance=,increaseitsvalueuntilall96nodesareidentifiedasshowninthefollowingimage.2/12HyperMeshHyperMeshTutorialsQualityCheckingandEditingMesh-HM-33002014/9/3file:///D:/Program/HyperMesh/help/hm/hm3300.htmBecarefulnottoincreasethetolerancevaluetotoomuch.Althoughthe96nodeswillbeidentified,anexcessivelylargetolerancevaluemaycollapseelementswhentheidentifiednodesareequivalenced.Tofindoutthemaximumvaluethatcanbesafelyusedfortolerancewithoutcollapsingtheelements,presstheF10keytogotothecheckelemspanel,goto2-dsub-panelandclicklength.Thestatusbarwilldisplay‘…Theminlengthis1.49.’Atolerancevalue1.49cansafelybeused,withoutcausinganyelementstocollapsewhenidentifiednodesareequivalenced.Clickreturntogobacktoedgespanel.Thenodesidentifiedwithpreviewequivalence6.Clickequivalence.The96coincidentnodesareequivalenced.7.Rotateandobservethemodeltoseethatthemeshstilllooksasitshouldandnoelementsarecollapsed.8.Clickdeleteedges.Thered,freeedgesandtheircomponent,^edges,aredeleted.Note:Remainintheedgespanel.Step4:Reviewthemodel’sfreeedgesagaintoconfirmthatalloftheshellelementconnectivityproblemshavebeencorrected.1.Clickfindedges.Observethered,1-Delements(freeedges).Arethereanyred,freeedgesthatshouldnotbelongifthemeshwascontinuousorifalloftheelementswereconnected?Hint:Onlyred,freeedgesshouldexistontheperimeterofthepartandonperipheryofinternalholes.2.UsetheModelbrowsertoturnthedisplayoffandonforthecomponent,shells,toobservethatallofthefree,rededgesbelong.3.Afterverifyingthatthemodelhascorrectred,freeedges,clickdeleteedges.3/12HyperMeshHyperMeshTutorialsQualityCheckingandEditingMesh-HM-33002014/9/3file:///D:/Program/HyperMesh/help/hm/hm3300.htmRed,freeedgesthatbelongStep5:Displaytheelementnormalsandadjustthemtopointinthesamedirection.1.Gotothenormalspanel.Thenormalspanelcanbeaccessedinthefollowingways:•FromtheMenuBar,selectMesh,thenCheck,thenElements,andthenNormals•Fromthemainmenu,selecttheToolpage,thenclicknormals•PresstheSHIFT+F10keys2.Choosetheelementssub-panelandsettoggletovectordisplaynormals.3.Withthecompsselectoractive,selectoneelementfromthegraphicsareatoselectthecomponent.4.Clickdisplaynormals.Arrows(vectors)aredrawnfromtheelementcentroidsandshowthedirectionoftheelementnormals.Noticethearrowsdonotallpointfromthesamesideofthepart.Forsomeanalyses,theelementnormalsshouldpointfromthesameside.5.Clicksize=andenterthesizewhichthenormalshouldbeinmodelunitsandselectdisplaynormalsagain.Whensize=issetto0,thevectorwillbe10%ofthescreen.6.Togglevectordisplaynormalstocolordisplaynormals.7.Clickdisplaynormals.Theelementnormalsaredisplayedusingcolors.Theredsideoftheelementsisthepositivenormaldirection,whilethebluesideisthenegativenormaldirection.8.Noticeeachsideofthepartshowsredandblue.9.Clicktheorientation:elemselectortomakeitactive.10.Selectanelementfromthegraphicsarea.11.Clickadjustnormals.Allelementsoneithersideofthepartarethesamecolor,redorblue.Thestatusbardisplaysthefollowingmessage:[X]elementshavebeenadjusted.4/12HyperMeshHy