Transcription
Automated model creation inAbaqus/CAER Habermann, Darmstadt, 21.11.2019
Motivation for automatic methodsModel creationFEM calculation1980-2010Small projectComplex project1 week2h NSK Europe – Confidential2hSince 2010Small projectComplex project1 week1 week2h5 min2h2
FEM Calculation (Example)24 Subassemblies69 PartsAssembly FEMSpec:Forces, BCs, Interactions, Machine elements,Type of analysis, NSK Europe – ConfidentialFiscal RequirementTime (Man-days FEM Specialist,time to report)3
Manual model creation in Abaqus/CAE1 Assembly65 Parts1 Assembly26 Parts38 InteractionsAbstraction, Interactions,Meshing, Connectors Import in Abaqus NSK Europe – ConfidentialTime for model creation by specialist: 1 Week4
Existing Strategies to speed up model creation Templates FEM Apps 3DexperienceSource: Sharma, B., Kulkarni, M., Sundararaja, S.:Automation of CAE Tasks to Improve Work 7-technicalpapers/Mod&Viz/01 Mod IATC2017 Paper Maruti.pdfSource: Dassault Systems User Assistance R2019x: Simulation Simulation ProcessModeling Performance Study Input and Output Parameters Editing theParameters of a Simulation ProcessSource: COMSOL: COMSOL Multiphysics 5.1 Release cation-builde NSK Europe – Confidential5
Criticism on the State of artManual Creation:Too much time neededTemplates:Good idea, but creation of the template itself is still time consuming, programmingknowledge neededFEM Apps:Really fast execution times, but even more focused on one particular simulation caseWanted:Method to speed up the first model creation significantly, without programmingknowledge. Useable with a GUI or text based. Additional design iterations should benearly instantaneous NSK Europe – Confidential6
AutoFEMFramework & GUICAD model preparation››››NamesMaterialsLoads /CAE NSK Europe – Confidential7
Catia Model preparationPoint24 Assemblies69 PartsSurface1 Assembly16 PartsLineExport assembly asCATpartDesigner:Hide unimportant parts and abstract partsCreate surfaces, lines and pointsCreate poses NSK Europe – ConfidentialTime for model abstraction:4 hours8
First AutoFEM runPointSurfacePoints1 Assembly16 PartsSurface16 PartsLineLineAutomatic creation of surfaces in parts,datum lines and points, with usefulnamed sets, parts and so on NSK Europe – Confidential9
Model creation with the AutoFEMManual model creation directly in the cnp file or in the GUI NSK Europe – Confidential10
Highlights of the AutoFEM Orphan meshes with automatic mesh association Rotational symmetry for automatic hexahedral meshing Metaprogramming (use of variables, generators and arguments) Easy switch between standard and explicit No dependency of topological changes or mesh quality Included complex bearing modelling Rigid parts supported Complete model creation with output of finished input file Documentation in DocuWiki GUI in active development NSK Europe – Confidential11
Orphan meshCAD Part with LogoOrphan meshAutomatically mergedAutomatic mesh association, basedon cad faces NSK Europe – Confidential12
Rotational symmetryOriginal CAD PartRotational symmetric partCross section NSK Europe – Confidential13
MetaprogrammingUse of a variables and arguments, some mathematical expressions are allowed, but only in [Variable].[Variable]SpacerHSIS !arg1 0.855GearForceX 57936GearForceY 89945GearForceZ 204741GearForce %GearForceX, -1*%GearForceY, -1*%GearForceZSpacer1 int(!arg1 * -1000)The variables can be accessed anywhere in the config file by using the % sign, e.g.[Load 2]Type LineName GearFeature GearValue %GearForceStepOn Load NSK Europe – Confidential14
Complex bearing modelling5 nonlinear connectorsper roller elementRBE 3Connector alignwith nodes NSK Europe – Confidential15
No dependency of topological changes or mesh qualityAssociative InterfaceCADAutoFEMCADP2P1P1P2FEMFEM50 mm50 mm50 mmExtra features20 mmFEM20 mm20 mm50 mm20 mmFEMExtra features For small parametric changes, the associative interface is a very good and cost effective solution for aniterative design process. For one shot assemblies or iterative design processes with big topological changes, the AutoFEM is fasterand more robust. NSK Europe – Confidential16
DocumentationComplete, up to date documentation of the APIExamples in preparationGUI in development NSK Europe – Confidential17
Complete model creation with output of finished input fileUp to date: Complex static wind models with nonlinear bearings, parametric spacer setting Model creation from 6 months down to 2 weeks Explicit orbital cold deformation with ALE (Swaging) Modal analysis of steering systems Clamping of complex mechanical systems (over 70 interactions) Very fast iterative design cycles for Hub and Powertrain components NSK Europe – Confidential18
Manual model creation in Abaqus/CAE 1 Assembly 65 Parts Import in Abaqus Abstraction, Interactions, . Dassault Systems User Assistance R2019x: Simulation Simulation Process . Criticism on the State of art Manual Creation: Too much time needed Templates: Good idea, but creation of the template itself is still time consuming, programming .
