ANSYS-R17-拓?fù)鋬?yōu)化ACT使用方法

1、ANSYS Topology Optimization ACT ExtensionANSYS Inc.17.0 Release ANSYS Topology Optimization - OverviewACT Application name: ANSYS Topology OptimizationACT Application version: R17.0Target application: WB Mechanical ANSYS compatible version: R17.0Description:Exposes Topology Optimization capabilities

2、 in Workbench Mechanical. The optimized model can then be exported and edited in SpaceClaim to perform subsequent validation analysis, optionally import into a CAD system, and/or be sent to a 3D printer for manufacture.InformationPlease pay attention to paragraph 9 of the CLICKWRAP SOFTWARE LICENSE

3、AGREEMENT FOR ACS EXTENSIONS regarding TECHNICAL ENHANCEMENTS AND CUSTOMER SUPPORT (TECS): “TECS is not included with the Program(s)”Report any issue or provide feedback related to this app please contact:Steve.PilzBinary App Installation (1)Installing from the ACT Start Page:From the project page,

4、select the“ACT Start Page” optionClick on “Extension Manager”Press “+” symbol in the top right cornerIt will open a file dialog to select theappropriate “*.wbex” binary fileThe extension is installedLoading the extension:From the Extension Manager,click on your extension and chooseLoad ExtensionThe

5、extension is loadedNotes: The extension to be installed will be stored in the following location: %AppData%Ansysv170ACTextensions The installation will create a folder in this location, in addition to the .wbex fileBinary App Installation (2)Once the binary extension is installed at default location

6、, one can move the *.wbex and the folder to any other locationDefault path: %AppData%Ansysv170ACTextensionsNew path: Any location on your machine, shared drive etc.All users interested in using the extension need to include that path in their Workbench OptionsIn the “Tools” menu, select the “Options

7、”Select “Extensions” in the pop up panelAdd the path under “Additional Extensions Folder ”Define additional folders in which ACT will search for extensions in order to expose them in the Extension Manager123Notes: During the scan of the available extensions, the folders will be analyzed according to

8、 the following order:The application data folder(e.g. %AppData%Ansysv170ACTextensions)The additional folders defined in the “Additional Extension Folders” propertyThe installation folderThe “extensions” folder part of the current Workbench project (if the project was previously saved with the extens

9、ion) If an extension is available in more than one of these locations, the 1st one according to the scan order is usedUser Documentation ContentsOverviewUser GuideDesign OptimizationValidation AnalysisANSYS Topology Optimization ACT ExtensionSummary of capabilities:This ACT App installs a Topology O

10、ptimization System in the Workbench Project SchematicThe ACT App exposes Topology Optimization capabilities in Workbench MechanicalVarious optimization objective and constraint response types are available for optimizing Static Structural designsThe shape of the optimized design can be viewed and sa

11、ved in the form of an STL fileSpaceClaim can be used to clean up, modify and convert the STL file into a solid modelThe design can be verified by importing the solid model into a downstream Static Structural System and performing validation analysisThe STL file of the optimized model can be sent to

12、a 3D printer for manufactureCapabilities Overview: Topology OptimizationObjective FunctionsSingle and Multi ComplianceLocal Degree of FreedomLocal DisplacementReaction ForceVolume, MassConstraint FunctionsLocal Degree of FreedomReaction ForceVolume, MassLocal StressGlobal StressManufacturing Constra

13、intsMaximum Member SizeMinimum Member SizeSymmetryExtrusionMechanical PhysicsLinear StressSteady StateLinear Bonded ContactSolid Bodies (2D and 3D)Capabilities Overview: Exposure and Workflow (1)Static Structural Problem SetupSet up in Static Structural SystemOptionally Solve to obtain reference sol

14、utionOptimize DesignLink to downstream Topology Optimization System (ACT Extension)Define Design Objectives, Design and Manufacturing ConstraintsSolve to obtain optimized modelVisualize, inspect and “extract” shape of optimized modelExport/Save STL file of optimized modelCapabilities Overview: Expos

15、ure and Workflow (2)Validate DesignEdit STL model in SpaceClaim and convert to solid geometryCreate downstream Static Structural System to validate optimized designImport model into downstream Static Structural System, remesh and reapply problem setupPerform validation analysisUser Guide: Static Str

16、uctural Problem SetupStatic Structural Problem Setup for OptimizationCreate “Design Space”Create geometry from scratch, orImport part or assembly to be optimizedApply loads, supports, material props, etc. Guidelines for meshing design spaceSet Physics Preference to MechanicalUse quadrilateral elemen

17、ts (Mid Side Nodes Kept)Preferred elements are Hexs followed by Wedges, followed by TetsWhere possible use a constant element sizeUser Guide: Design OptimizationTopology Optimization App InstallationInstalling from the ACT Start Page:From the project page, select the“ACT Start Page” optionClick on “

18、Extension Manager”Press “+” symbol in the top right cornerIt will open a file dialog to select thedownloaded “TopologyOptimization.wbex” binary fileThe extension is installedLoading the extension:From the Extension Manager,click on your extension and chooseLoad ExtensionThe extension is loadedNotes:

19、 The extension to be installed will be stored in the following location: %AppData%Ansysv170ACTextensions The installation will create a folder in this location, in addition to the .wbex fileAccessing the Topology Optimization SystemLinking the Topology Optimization System to the Static Structural Sy

20、stem introduces the “Ansys Topology Optimization” folder in the Workbench Mechanical Project OutlineTopology Optimization controls can be “Inserted” using this folderThese controls are also available on the Workbench Mechanical ToolbarAnalysis Settings exposes various solver settings and controlsDef

21、ault settings are appropriate for most casesNote: Topology Optimization solution must converge before results can be viewed.Tip: A rough and quick solution can be obtained by relaxing the Convergence Tolerance to 1%Specify Areas of the Model to be Optimized and Areas to be ExcludedInsert the “Design

22、 Region” control and scope to areas to be optimizedMay be an entire assembly, a sub-assembly, or a multi- or single-body partInsert the “Exclusion” control to identify areas of the Design Region where material should not be removedMay be any Geometry Selection or Named SelectionNote: Exclusions may

23、also be applied to selective areas of the mesh. Use the Worksheet Scoping Method of the Named Selections control to select the target mesh region.Specify Design Optimization ObjectivesInsert the “Objective” control and select desired Objective Response Type and corresponding Goal. Following Response

24、 Types are supported in R17.0Single and Multiple ComplianceLocal Degree of FreedomLocal DisplacementReaction ForceVolumeMassNote: Only one Objective can be used per analysisNote: Multiple load cases may be used per analysis. Each load case should represent a single step in the Static Structural prob

25、lem set up. E.g., three load steps will require the Number of Steps under the Analysis Settings Control to be set to 3Specify Design Optimization ConstraintsInsert the “Constraint” control and select desired Constraint Response Type and corresponding settings. Following Response Types are supported

26、in R17.0Local Degree of FreedomReaction ForceVolumeMassLocal StressGlobal StressNote: In R17.0 Local Degree of Freedom and Reaction Force Constraints can be scoped to a single mesh node only, and the Local Stress Constraint can be scoped to a single mesh element only.Important Note: The problem defi

27、nition will be incomplete if a single Constraint is used that has the same Response Type as that selected in the Objective - e.g., a single Volume (or Mass) Constraint in combination with Volume (or Mass) Objective. If the goal is to obtain the stiffest possible structure at a given fraction of the

28、Design Space Volume (or Mass), use the Single or Multiple Compliance Objective in combination with a Volume (or Mass) Constraint.Important Note: Special care should be taken when applying Local Degree of Freedom, Reaction Force, Local Stress and Global Stress Constraints to ensure the design optimiz

29、ation problem statement is well-defined. It is strongly recommended that the corresponding Structural Static problem be solved first on the Design Space (i.e., un-optimized model) to develop a “feel” for appropriate lower and/or upper bounds for setting these constraints. E.g., setting an Upper Boun

30、d value for the Global Stress Constraint that is significantly lower than the Maximum Stress encountered in solving the un-optimized model is not a realistic constraint and will likely lead to a Solver Error.Specify Manufacturing ConstraintsFollowing manufacturing constraints are supported in R17.0M

31、inimum Member SizeMaximum Member SizeExtrusionSymmetryNote: To ensure proper numerical resolution, it is recommended that a Minimum Member Size Constraint always be applied and its value to be set to at least 2.5 times the typical mesh element sizeNote: The application of the Extrusion or Symmetry C

32、onstraints requires that the mesh reflect the extruded or symmetry characteristics of the constraint. E.g., when applying an Extrusion Constraint in the X-direction, the mesh should be generated in such a way that it also extrudes in the X-direction. Typically in such cases one will use the Sweep or

33、 MultiZone mesh methods.Note: The Symmetry and Extrusion Constraints cannot be combined in a given simulationNote: A suite of examples are available in the ACT extension package that demonstrate the setup of Optimization Objectives and Constraints for a range of problemsLaunch Topology Optimizer, Mo

34、nitor Solution ConvergenceTo launch the optimizer, right-click on the Solution folder under the Ansys Topology Optimization folder and select “Solve”Note: Shared memory parallel (SMP) processing is supported and up to the maximum number of the physical CPUs can be usedThere are three ways to monitor

35、 solution convergenceSolver output in Solution Information Worksheet viewIteration progress text window launches automaticallySolution Convergence GraphsNote: The progressing solution can be stopped, but not interruptedNote: Solution must converge before the results can be retrievedTip: The Solution

36、 Convergence graph and table do not get automatically refreshed once activated from the Show dropdown command. To update the Solution Convergence graph and table manually, clear the data via the Hide dropdown command, and then reissue the Show command.Retrieving Optimizer ResultsThe Optimizer return

37、s a 3D solution field of pseudo density elemental values that range from 0.0 to 1.0.A value close to 1 indicates material is experiencing load and must be retained, a value close to 0 indicates the material is redundant and may be removed.From the Solution folder, Insert “Values” and/or “Averaged No

38、de Values” to retrieve the solution“Values” represent the raw pseudo densities defined at element centroids“Averaged Nodal Values” represent the smoothed pseudo densities mapped to the element nodesImportant Note: It is strongly recommended that the “Average Node Values” result be used for visualizi

39、ng the optimizer results, especially for visualizing the shape of the optimized model and extracting it for validation analysis in a downstream Workbench Mechanical System. See Next slide.Visualize and Export Optimized ShapeBest way to visualize the 3D shape of the optimized model is to use “Capped

40、Isosurface” contouring command with the “Bottom Capped IsoSurface” optionThe slider bar may be used to visualize how the shape of the optimized model changes with different values of pseudo densityLower values of pseudo density lead to “chunkier” shapes, higher values lead to “slender” shapes.Import

41、ant Note: You should use intuition and engineering judgement to pick the pseudo density value that results in the “best” optimized shape. Tip: It is good practice to err on the side of caution and resist the urge to remove too much material! Typical values of pseudo density range from 0.3 to 0.7.To

42、export the optimized shape, right click on Average Node Values and select Export STL FileTip: To ensure portability of the project, save the STL file in the user_files subdirectory of the Workbench Projects *_files directoryUser Guide: Validation AnalysisEdit STL File in SpaceClaim (1)The STL file e

43、xported from WB Mechanical is not suitable for performing validation analysis or for sending to a 3D printerImport the STL file into SpaceClaim to:Fix intersecting, overlapping facetsMake STL surface mesh watertightCoarsen to reduce the number of facetsSmooth organic surfaces generated by optimizerO

44、ptionally, add more material near bolt holes, areas of contact etc.Convert back to solid geometry and export to downstream Workbench Mechanical System to perform design validation analysisImportant notes:The Facets capability in SpaceClaim is used to edit STL geometryA separate license is required t

45、o use the Facets capabilityUse SpaceClaim Options to activate Facets tab in the GUIFile SpaceClaim Options LicenseCheck STL Prep checkboxEdit STL File in SpaceClaim (2)Important notes: On import, explicitly set STL units to be same as units in the original Design Space Geometry fileUse Measure comma

46、nd to confirm model has correct length units after importTip:It is recommended that the original Design Space also be imported into SpaceClaim. This provides the option of reusing parts from the original geometry to modify the optimized geometry. Important notes:Use the “Check Mesh” command to check

47、 the imported raw STL model for errorsIt is strongly recommended that you use the “Auto Fix” mesh command first to automatically fix all or most of the errorsOther commands under Cleanup, Organize, and Modify can be used to fix any remaining errors and obtain a valid faceted geometry Edit STL File i

48、n SpaceClaim (3)After obtaining a valid STL geometry you may proceed to smooth the model and reduce the number of facets in readiness for converting to a solid modelYou may use a combination of the “Reduce” and “Smooth” commands under Adjust.Another powerful option for reducing and smoothing the fac

49、ets in one step, is the “Shrinkwrap” command under Create.You may optionally wish to modify the optimized model by adding more material in critical areas, such as those near high stress areas around bolt holes Note:SpaceClaim provides a rich set of tools for editing and manipulating faceted geometry

50、. Please refer to SpaceClaim user documentation and videos to learn more about how best to use these tools for editing your STL modelsCoarse STL model using combination of Reduce and Smooth commandsRefined STL model where surfaces from original CAD model have been used to extrude material near bolt

51、holes and merge with bracket. The Shrinkwrap command is used to coarsen and smooth the facetsConvert to Solid GeometryTo perform a design validation study on the optimized model, the STL geometry must first be converted to solid geometrySelect the cleaned up STL geometry in the GUI tree, right click

52、 and select: Convert to solid Merge facesNote: The “Merge faces” option reduces the number of faces in the converted solid model by merging facets on flat surfaces. This further reduces the number of nurbs faces which in turn helps reduce the size of the solid model file that is generatedFinally, sa

53、ve the solid Geometry file as a native SpaceClaim file for design validation analysisTip: To ensure portability of the project, save the file in the user_files subdirectory of the Workbench Projects *_files directoryPerform Design Validation (1)Create a “Duplicate” of the Static Structural System (S

54、ystem A in Figure below) and place it downstream of the Ansys Topology Optimization System (System B)The duplicate Static Structural System (System C) contains boundary conditions and other settings that can be reused to perform validation analysis on the optimized modelRight click on the Geometry c

55、ell of System C and “Replace Geometry” with the solid geometry of the optimized model exported from SpaceClaimEdit the Model cell in System C to launch Workbench Mechanical. Click “Yes” to read the optimized model geometry. On startup, the old Design Space geometry is replaced by the new optimized model geometry i