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1、Shape Finder,Workshop 8,February 13, 2004 Inventory #002022 WS8-2,Workshop 8 - Goals,To use the DS shape optimization tool to indicate potential geometry changes that will result in a reduction in part mass. To request a 40% reduction in the part mass. To create multiple tree branches in the DS GUI
2、in order to allow results comparisons after solving.,February 13, 2004 Inventory #002022 WS8-3,Workshop 8 - Assumptions,The geometry for workshop 8 consists of 2 Parasolid files. In actual practice users would typically bring geometry from their preferred CAD system and simply update as needed. For
3、training purposes we provide the original as well as the modified geometry files. The geometry and boundary conditions in this workshop is extremely simple. The workshop is intended to demonstrate the basics of shape optimization without undue time spent during preprocessing and solution.,February 1
4、3, 2004 Inventory #002022 WS8-4,Workshop 8 - Start Page,Choose “A link to a geometry file on my computer or network” and browse to the file “Bracket_opt.x_t”. Call the project “Bracket_opt” and specify the location provided by the instructor. “Open a new simulation based on the selected geometry”. W
5、hen DS starts, close the Template menu by clicking the X in the corner of the window. Choose the Metric (mm) unit system. “Units Metric (mm, kg, MPa, C, s)”.,February 13, 2004 Inventory #002022 WS8-5,Workshop 8 - Preprocessing,Highlight the “Mesh” branch. In the detail window set the “Relevance = 10
6、0”. Change selection filter to “body select” and select the part. RMB Insert Element Shape Change the detail to “All Tetrahedrons”.,5,3,February 13, 2004 Inventory #002022 WS8-6,Workshop 8 Meshing Notes,Because of the nature of topological optimization it is recommended that the mesh relevance be hi
7、gh during a shape run. Shape optimization allows ONLY tetrahedral element shapes. While some geometry will automatically be tet meshed, other cases will require the mesh control for element shape be used. In this workshop, for example, the geometry could be sweep meshed resulting in a hex element me
8、sh.,February 13, 2004 Inventory #002022 WS8-7,Workshop 8 - Environment,Make sure the selection filter is reset to surface select. Highlight the Environment branch. Select the surfaces of the 2 cylinders shown below. RMB Insert Fixed Support,7,February 13, 2004 Inventory #002022 WS8-8,. . . Workshop
9、8 - Environment,Select the surface of the cylinder shown below. RMB Insert Force. Change to “Component” method. Enter X = 10 N; Y = 5 N.,10,11,9,12,February 13, 2004 Inventory #002022 WS8-9,Workshop 8 - Solution,Highlight the solution branch. RMB Insert Shape Finder. Enter “40%” in the Target Reduct
10、ion field. Solve,13,14,15,February 13, 2004 Inventory #002022 WS8-10,Workshop 8 - Result,When the solution is complete highlight the shape finder branch to view the results. The red region in the plot indicates where we can potentially remove material while maintaining the parts structural integrity
11、. The detail shows that we have achieved a 40% reduction in mass.,February 13, 2004 Inventory #002022 WS8-11,. . . Workshop 8 - Result,While the result is a conceptual guide to where material might safely be removed we can use the ruler tool in the graphics window to better quantify how to modify th
12、e part. Based on these results we would typically return to the geometry source (CAD) to make modifications.,February 13, 2004 Inventory #002022 WS8-12,Workshop 8 - Verification,Remember! The results of a shape optimization solution indicate only where the optimal regions are that material can be re
13、moved. Nothing is implied about how the part will perform after the material is removed. Sound engineering practice requires that we test any new design to insure its performance is not compromised. If we were using a commercial CAD system (or DesignModeler) we could simply modify the original geome
14、try and “Update” the Simulation model to continue. In this workshop we began with a Parasolid file and will now import another Parasolid model representing the modified original part.,February 13, 2004 Inventory #002022 WS8-13,. . . Workshop 8 - Verification,Click on the Project tab. Highlight the p
15、roject level (top). Browse for the modified geomtery “Bracket_opt_2.x_t”.,18,17,16,February 13, 2004 Inventory #002022 WS8-14,. . . Workshop 8 - Verification,“Create a new simulation”. Since this new geometry represents our optimized part we wont use the “shape finder” again, rather we will now solv
16、e the model for the appropriate structural results. Repeat steps 2 through 12 to duplicate the mesh and the environment for Model 2 OR copy/paste and scope to the Model 2 branch as described on the next page.,19,February 13, 2004 Inventory #002022 WS8-15,Workshop 8 Copy/Paste/Scoping,The next X page
17、 demonstrates copying, pasting and scoping using the force load used in workshop 7. Other objects can be treated the same way. Remember you can copy multiple objects in a branch by holding the shift key and selecting a list. Highlight the “Force” in environment 1. RMB Copy. Highlight the environment
18、 under Model 2. RMB Paste.,b,c,d,a,February 13, 2004 Inventory #002022 WS8-16,. . . Workshop 8 Copy/Paste/Scoping,At this point, the definitions for the copied objects are in place, the only thing missing is the scope. Highlight the force. Select the surface where the load will be attached. “Apply”
19、the scope in the detail window. Repeat for other Model 1 objects.,f,February 13, 2004 Inventory #002022 WS8-17,. . . Workshop 8 - Verification,Highlight the solution branch for Model 2. RMB Insert Stress Equivalent (von Mises). RMB Insert Deformation Total. Solve,February 13, 2004 Inventory #002022 WS8-18,. . . Workshop 8 - Verification,The final step in Shape Optimization is to evaluate structural results to determine if the changes in the geometry have degraded the desired performance of the structure.,