ANSYS R17 拓扑优化ACT使用方法

1、ANSYS Topology Optimization ACT Extension,ANSYS Inc.,17.0 Release,ANSYS Topology Optimization - Overview,ACT Application name: ANSYS Topology Optimization ACT Application version: R17.0 Target application: WB Mechanical ANSYS compatible version: R17.0 Description: Exposes Topology Optimization capab

2、ilities 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.,Information,Please pay attention to paragraph 9 of the CLICKWRAP SOFTWARE

3、 LICENSE 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.Pilz,Binary App Installation (1),Installing from the ACT Start Page: From the

4、project page, select the “ACT Start Page” option Click on “Extension Manager” Press “+” symbol in the top right corner It will open a file dialog to select the appropriate “*.wbex” binary file The extension is installed Loading the extension: From the Extension Manager, click on your extension and c

5、hoose Load Extension The extension is loaded,Notes: 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 file,Binary App Installation (2),Once the binary extension is i

6、nstalled at default location, one can move the *.wbex and the folder to any other location Default path: %AppData%Ansysv170ACTextensions New path: Any location on your machine, shared drive etc. All users interested in using the extension need to include that path in their Workbench Options In the “

7、Tools” menu, select the “Options” Select “Extensions” in the pop up panel Add the path under “Additional Extensions Folder ”,Define additional folders in which ACT will search for extensions in order to expose them in the Extension Manager,1,2,3,Notes: During the scan of the available extensions, th

8、e folders will be analyzed according to the following order: The application data folder(e.g. %AppData%Ansysv170ACTextensions) The additional folders defined in the “Additional Extension Folders” property The installation folder The “extensions” folder part of the current Workbench project (if the p

9、roject was previously saved with the extension) If an extension is available in more than one of these locations, the 1st one according to the scan order is used,User Documentation Contents,Overview User Guide Design Optimization Validation Analysis,ANSYS Topology Optimization ACT Extension,Summary

10、of capabilities: This ACT App installs a Topology Optimization System in the Workbench Project Schematic The ACT App exposes Topology Optimization capabilities in Workbench Mechanical Various optimization objective and constraint response types are available for optimizing Static Structural designs

11、The shape of the optimized design can be viewed and saved in the form of an STL file SpaceClaim can be used to clean up, modify and convert the STL file into a solid model The design can be verified by importing the solid model into a downstream Static Structural System and performing validation ana

12、lysis The STL file of the optimized model can be sent to a 3D printer for manufacture,Capabilities Overview: Topology Optimization,Objective Functions Single and Multi Compliance Local Degree of Freedom Local Displacement Reaction Force Volume, Mass,Constraint Functions Local Degree of Freedom React

13、ion Force Volume, Mass Local Stress Global Stress,Manufacturing Constraints Maximum Member Size Minimum Member Size Symmetry Extrusion,Mechanical Physics Linear Stress Steady State Linear Bonded Contact Solid Bodies (2D and 3D),Capabilities Overview: Exposure and Workflow (1),Static Structural Probl

14、em Setup Set up in Static Structural System Optionally Solve to obtain reference solution Optimize Design Link to downstream Topology Optimization System (ACT Extension) Define Design Objectives, Design and Manufacturing Constraints Solve to obtain optimized model Visualize, inspect and “extract” sh

15、ape of optimized model Export/Save STL file of optimized model,Capabilities Overview: Exposure and Workflow (2),Validate Design Edit STL model in SpaceClaim and convert to solid geometry Create downstream Static Structural System to validate optimized design Import model into downstream Static Struc

16、tural System, remesh and reapply problem setup Perform validation analysis,User Guide: Static Structural Problem Setup,Static Structural Problem Setup for Optimization,Create “Design Space” Create geometry from scratch, or Import part or assembly to be optimized Apply loads, supports, material props

17、, etc. Guidelines for meshing design space Set Physics Preference to Mechanical Use quadrilateral elements (Mid Side Nodes Kept) Preferred elements are Hexs followed by Wedges, followed by Tets Where possible use a constant element size,User Guide: Design Optimization,Topology Optimization App Insta

18、llation,Installing from the ACT Start Page: From the project page, select the “ACT Start Page” option Click on “Extension Manager” Press “+” symbol in the top right corner It will open a file dialog to select the downloaded “TopologyOptimization.wbex” binary file The extension is installed Loading t

19、he extension: From the Extension Manager, click on your extension and choose Load Extension The extension is loaded,Notes: 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 th

20、e .wbex file,Accessing the Topology Optimization System,Linking the Topology Optimization System to the Static Structural System introduces the “Ansys Topology Optimization” folder in the Workbench Mechanical Project Outline Topology Optimization controls can be “Inserted” using this folder These co

21、ntrols are also available on the Workbench Mechanical Toolbar Analysis Settings exposes various solver settings and controls Default settings are appropriate for most cases Note: Topology Optimization solution must converge before results can be viewed. Tip: A rough and quick solution can be obtaine

22、d by relaxing the Convergence Tolerance to 1%,Specify Areas of the Model to be Optimized and Areas to be Excluded,Insert the “Design Region” control and scope to areas to be optimized May be an entire assembly, a sub-assembly, or a multi- or single-body part Insert the “Exclusion” control to identif

23、y areas of the Design Region where material should not be removed May be any Geometry Selection or Named Selection Note: Exclusions may 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 Op

24、timization Objectives,Insert the “Objective” control and select desired Objective Response Type and corresponding Goal. Following Response Types are supported in R17.0 Single and Multiple Compliance Local Degree of Freedom Local Displacement Reaction Force Volume Mass Note: Only one Objective can be

25、 used per analysis Note: Multiple load cases may be used per analysis. Each load case should represent a single step in the Static Structural problem set up. E.g., three load steps will require the Number of Steps under the Analysis Settings Control to be set to 3,Specify Design Optimization Constra

26、ints,Insert the “Constraint” control and select desired Constraint Response Type and corresponding settings. Following Response Types are supported in R17.0 Local Degree of Freedom Reaction Force Volume Mass Local Stress Global Stress,Note: In R17.0 Local Degree of Freedom and Reaction Force Constra

27、ints 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 definition 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 Volu

28、me (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 Design Space Volume (or Mass), use the Single or Multiple Compliance Objective in combination with a Volume (or Mass) Constraint. Important Note

29、: Special care should be taken when applying Local Degree of Freedom, Reaction Force, Local Stress and Global Stress Constraints to ensure the design optimization problem statement is well-defined. It is strongly recommended that the corresponding Structural Static problem be solved first on the Des

30、ign 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 Bound value for the Global Stress Constraint that is significantly lower than the Maximum Stress encountered in solving the un-optimized model is n

31、ot a realistic constraint and will likely lead to a Solver Error.,Specify Manufacturing Constraints,Following manufacturing constraints are supported in R17.0 Minimum Member Size Maximum Member Size Extrusion Symmetry,Note: To ensure proper numerical resolution, it is recommended that a Minimum Memb

32、er Size Constraint always be applied and its value to be set to at least 2.5 times the typical mesh element size Note: The application of the Extrusion or Symmetry Constraints requires that the mesh reflect the extruded or symmetry characteristics of the constraint. E.g., when applying an Extrusion

33、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 MultiZone mesh methods. Note: The Symmetry and Extrusion Constraints cannot be combined in a given simulation Note: A suite of example

34、s are available in the ACT extension package that demonstrate the setup of Optimization Objectives and Constraints for a range of problems,Launch Topology Optimizer, Monitor Solution Convergence,To launch the optimizer, right-click on the Solution folder under the Ansys Topology Optimization folder

35、and select “Solve” Note: Shared memory parallel (SMP) processing is supported and up to the maximum number of the physical CPUs can be used There are three ways to monitor solution convergence Solver output in Solution Information Worksheet view Iteration progress text window launches automatically

36、Solution Convergence Graphs Note: The progressing solution can be stopped, but not interrupted Note: Solution must converge before the results can be retrieved Tip: The Solution Convergence graph and table do not get automatically refreshed once activated from the Show dropdown command. To update th

37、e Solution Convergence graph and table manually, clear the data via the Hide dropdown command, and then reissue the Show command.,Retrieving Optimizer Results,The Optimizer returns a 3D solution field of pseudo density elemental values that range from 0.0 to 1.0. A value close to 1 indicates materia

38、l 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 Node Values” to retrieve the solution “Values” represent the raw pseudo densities defined at element centroids “Averaged

39、Nodal Values” represent the smoothed pseudo densities mapped to the element nodes Important Note: It is strongly recommended that the “Average Node Values” result be used for visualizing the optimizer results, especially for visualizing the shape of the optimized model and extracting it for validati

40、on analysis in a downstream Workbench Mechanical System. See Next slide.,Visualize and Export Optimized Shape,Best way to visualize the 3D shape of the optimized model is to use “Capped Isosurface” contouring command with the “Bottom Capped IsoSurface” option The slider bar may be used to visualize

41、how the shape of the optimized model changes with different values of pseudo density Lower values of pseudo density lead to “chunkier” shapes, higher values lead to “slender” shapes. Important Note: You should use intuition and engineering judgement to pick the pseudo density value that results in t

42、he “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 export the optimized shape, right click on Average Node Values and select Export STL File Tip: To ensure porta

43、bility of the project, save the STL file in the user_files subdirectory of the Workbench Projects *_files directory,User Guide: Validation Analysis,Edit STL File in SpaceClaim (1),The STL file exported from WB Mechanical is not suitable for performing validation analysis or for sending to a 3D print

44、er Import the STL file into SpaceClaim to: Fix intersecting, overlapping facets Make STL surface mesh watertight Coarsen to reduce the number of facets Smooth organic surfaces generated by optimizer Optionally, add more material near bolt holes, areas of contact etc. Convert back to solid geometry a

45、nd export to downstream Workbench Mechanical System to perform design validation analysis Important notes: The Facets capability in SpaceClaim is used to edit STL geometry A separate license is required to use the Facets capability Use SpaceClaim Options to activate Facets tab in the GUI File SpaceC

46、laim Options License Check STL Prep checkbox,Edit STL File in SpaceClaim (2),Important notes: On import, explicitly set STL units to be same as units in the original Design Space Geometry file Use Measure command to confirm model has correct length units after import Tip: It is recommended that the

47、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 the imported raw STL model for errors It is strongly recommended that you use the “Aut

48、o Fix” mesh command first to automatically fix all or most of the errors Other commands under Cleanup, Organize, and Modify can be used to fix any remaining errors and obtain a valid faceted geometry,Edit STL File in SpaceClaim (3),After obtaining a valid STL geometry you may proceed to smooth the m

49、odel and reduce the number of facets in readiness for converting to a solid model You may use a combination of the “Reduce” and “Smooth” commands under Adjust. Another powerful option for reducing and smoothing the facets in one step, is the “Shrinkwrap” command under Create. You may optionally wish

50、 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. Please refer to SpaceClaim user documentation and videos to learn more about h

51、ow best to use these tools for editing your STL models,Coarse STL model using combination of Reduce and Smooth commands,Refined STL model where surfaces from original CAD model have been used to extrude material near bolt holes and merge with bracket. The Shrinkwrap command is used to coarsen and sm

52、ooth the facets,Convert to Solid Geometry,To perform a design validation study on the optimized model, the STL geometry must first be converted to solid geometry Select the cleaned up STL geometry in the GUI tree, right click and select: Convert to solid Merge faces Note: The “Merge faces” option re

53、duces 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 generated Finally, save the solid Geometry file as a native SpaceClaim file for design validat

54、ion analysis Tip: To ensure portability of the project, save the file in the user_files subdirectory of the Workbench Projects *_files directory,Perform Design Validation (1),Create a “Duplicate” of the Static Structural System (System A in Figure below) and place it downstream of the Ansys Topology

55、 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 model,Right click on the Geometry cell of System C and “Replace Geometry” with the solid geometry of the optimized model exported from SpaceClaim Edit 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 in