2005 MSC.Software Corporation
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WORKSHOP 1C NORMAL MODES ANALYSIS WITH FINE MESH презентация
Содержание
- 1. WORKSHOP 1C NORMAL MODES ANALYSIS WITH FINE MESH
- 3. NORMAL MODES ANALYSIS Problem Description For this
- 4. NORMAL MODES ANALYSIS Suggested Exercise Steps Import
- 5. CREATE A NEW DATABASE Create a new
- 6. Step 1. File / Import Import the
- 7. Step 2. Elements: Delete / Any Delete
- 8. Step 3. Elements: Create / Mesh /
- 9. Step 4. Loads/BCs: Modify / Displacement /
- 10. Step 5. Analysis: Analyze / Entire Model
- 11. Step 5. Analysis: Analyze / Entire Model
- 12. Step 6. Analysis: Access Results / Attach
- 13. Step 7. Results: Create / Quick Plot
- 14. Step 7. Results: Create / Quick Plot (Cont.)
- 15. Summary Summary of Frequencies and Modes for project _______________
NORMAL MODES ANALYSIS Problem Description For this problem, we will repeat the procedures of Workshop 1b, except that the model will be meshed with a Global Edge Length of 0.1. The
Слайд 1WS1c-
WORKSHOP 1C
NORMAL MODES ANALYSIS WITH FINE MESH
NAS122, Workshop 1c, August 2005
Copyright©
Слайд 3NORMAL MODES ANALYSIS
Problem Description
For this problem, we will repeat the procedures
of Workshop 1b, except that the model will be meshed with a Global Edge Length of 0.1. The goal is to see the difference between a fine meshed model and a coarse meshed model.
Слайд 4NORMAL MODES ANALYSIS
Suggested Exercise Steps
Import the model definition from Workshop 1a.
Delete
the existing finite elements.
Mesh the surface with a Global Edge Length of 0.1.
Modify the constraints definition to incorporate the new finite element model.
Submit the model to MSC.Nastran for analysis.
Attach the .XDB results file.
Post Process results – create a quick plot for each of the 10 mode shapes.
Mesh the surface with a Global Edge Length of 0.1.
Modify the constraints definition to incorporate the new finite element model.
Submit the model to MSC.Nastran for analysis.
Attach the .XDB results file.
Post Process results – create a quick plot for each of the 10 mode shapes.
Слайд 5CREATE A NEW DATABASE
Create a new database called ws1c.db.
File / New.
Enter
ws1c as the file name.
Click OK.
Choose Default Tolerance.
Select MSC.Nastran as the Analysis Code.
Select Structural as the Analysis Type.
Click OK.
Click OK.
Choose Default Tolerance.
Select MSC.Nastran as the Analysis Code.
Select Structural as the Analysis Type.
Click OK.
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Слайд 6Step 1. File / Import
Import the model from Workshop 1a.
File /
Import.
Select MSC.Patran DB as the Source.
Select ws1a.db.
Click Apply.
Click OK when the Patran Database Import Summary appears.
Select MSC.Patran DB as the Source.
Select ws1a.db.
Click Apply.
Click OK when the Patran Database Import Summary appears.
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Слайд 7Step 2. Elements: Delete / Any
Delete all the finite elements.
Elements: Delete
/ Any.
Select all the elements and nodes in the model.
Click Apply.
Select all the elements and nodes in the model.
Click Apply.
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Слайд 8Step 3. Elements: Create / Mesh / Surface
Create the finite element
on the surface using Global Edge Length of 0.1.
Elements: Create / Mesh / Surface.
Make sure the Elem Shape is Quad, the Mesher is IsoMesh, and the Topology is Quad4.
Select Surface 1.
Uncheck the Automatic Calculation option for Global Edge Length.
Enter 0.1 as the new Global Edge Length value.
Click Apply.
Elements: Create / Mesh / Surface.
Make sure the Elem Shape is Quad, the Mesher is IsoMesh, and the Topology is Quad4.
Select Surface 1.
Uncheck the Automatic Calculation option for Global Edge Length.
Enter 0.1 as the new Global Edge Length value.
Click Apply.
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Слайд 9Step 4. Loads/BCs: Modify / Displacement / Nodal
Modify the boundary condition
to incorporate the new finite element definition.
Loads/BCs: Modify / Displacement / Nodal
Select constraints.
Click on Modify Application Region.
Change the Geometry Filter to FEM.
Select all the nodes on the left edge of the plate.
Click Add and OK.
Click Apply.
Loads/BCs: Modify / Displacement / Nodal
Select constraints.
Click on Modify Application Region.
Change the Geometry Filter to FEM.
Select all the nodes on the left edge of the plate.
Click Add and OK.
Click Apply.
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Слайд 10Step 5. Analysis: Analyze / Entire Model / Full Run
Submit the
model for analysis.
Analysis: Analyze / Entire Model / Full Run.
Click on Solution Type.
Select Normal Modes.
Click on Solution Parameter.
Enter 0.00259 for Wt-Mass Conversion.
Click OK.
Click OK.
Analysis: Analyze / Entire Model / Full Run.
Click on Solution Type.
Select Normal Modes.
Click on Solution Parameter.
Enter 0.00259 for Wt-Mass Conversion.
Click OK.
Click OK.
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Слайд 11Step 5. Analysis: Analyze / Entire Model / Full Run (Cont.)
Submit
the model for analysis (cont.).
Click on Subcase Select.
Make sure Default subcase is selected.
Click OK.
Click Apply.
Click on Subcase Select.
Make sure Default subcase is selected.
Click OK.
Click Apply.
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Слайд 12Step 6. Analysis: Access Results / Attach XDB / Result Entities
Attach
the XDB result file.
Analysis: Access Results /Attach XDB / Result Entities.
Click on Select Results File.
Select ws1c.xdb.
Click OK.
Click Apply.
Analysis: Access Results /Attach XDB / Result Entities.
Click on Select Results File.
Select ws1c.xdb.
Click OK.
Click Apply.
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Слайд 13Step 7. Results: Create / Quick Plot
Create a Quick Plot of
the first mode shape.
Results: Create / Quick Plot.
Click on A1:Mode1.
Select Eigenvector, Translational in both Fringe and Deformation result boxes.
Click Apply.
Results: Create / Quick Plot.
Click on A1:Mode1.
Select Eigenvector, Translational in both Fringe and Deformation result boxes.
Click Apply.
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