Workshop 8-1 NAS101 Workshops Copyright 2001 MSC.Software Corporation WORKSHOP 8 Normal Mode Analysis of Stiffened Plates

Workshop 8-2 NAS101 Workshops Copyright 2001 MSC.Software Corporation Workshop 8 (cont.)

Workshop 8-3 NAS101 Workshops Copyright 2001 MSC.Software Corporation n Suggested Exercise Steps: 1. Import the PATRAN DB file from workshop 5 2. Create a new load set under Load Cases. Copy only the boundary conditions from previous load set 3. Run the normal mode analysis requesting only 6 modes using Lanczos method. 4. Put in PARAM,WTMASS, Submit the model to MSC.Nastran for analysis 6. Post-Process results using MSC.Patran.

Workshop 8-4 NAS101 Workshops Copyright 2001 MSC.Software Corporation Step 1. Load Case: Load Case/ Create Go to the Load Case and create a new load case name called normal mode. a.Type in normal mode in box under the Load Case Name b.Click on the button Assign/Prioritize Loads/BCs,and the menu on the far right will appear. c.Click on the Displ_translations from the upper left corner to select the boundary condition from previous loadset d.Click OK. e.Click Apply.

Workshop 8-5 NAS101 Workshops Copyright 2001 MSC.Software Corporation Step 2. Analysis: Analyze/ Entire Model/Full Run Submit the model for analysis. a.Analyze / Entire Model / Full Run. b.Click on the Solution Type. c.Select Normal Modes as the Solution Type. d.Click Solution Parameters e.See the menu on next slide

Workshop 8-6 NAS101 Workshops Copyright 2001 MSC.Software Corporation Step 3. Analysis: Analyze/ Entire Model/Full Run a.Uncheck the Large Displacements box b.Put in in the Wt-Mass Conversion box c.Put in node 0 in the Node I.d for Wt. Gener d.Click OK to close the form e.Click on Subcases to bring the form on the far right. f.Click on the normal mode as the Subcase Name g.Click on the Subcase Parameters button

Workshop 8-7 NAS101 Workshops Copyright 2001 MSC.Software Corporation Step 4. Analysis: Analyze/ Entire Model/Full Run a.Type in 6 in the Number of Desired Roots b.Click OK to close the form c.Click APPLY d.Click on the Subcases Select button

Workshop 8-8 NAS101 Workshops Copyright 2001 MSC.Software Corporation Step 5. Analysis: Analyze/ Entire Model/Full Run a.Select normal mode as the subcase name b.Click APPLY c.Click on the Subcase Select button on the far right menu

Workshop 8-9 NAS101 Workshops Copyright 2001 MSC.Software Corporation Step 6. Analysis: Analyze/ Entire Model/Full Run a.Click on the normal mode and see the selection on the bottom box b.Click OK c.Click APPLY

Workshop 8-10 NAS101 Workshops Copyright 2001 MSC.Software Corporation Step 7. Analysis: Attach XDB/ Result Entities/ Local Attach the XDB result file. a.Attach XDB / Result Entities / Local. b.Click on Select Result File. c.Select the file called w8. xdb d.Click OK. e.Click Apply.

Workshop 8-11 NAS101 Workshops Copyright 2001 MSC.Software Corporation Step 8. Results: Create/Quick Plot, MODE 1 Create a Quick Plot of the results. a.Create / Quick Plot. b.Select Mode 1 as the result case. c.Select Eigenvectors,Translational for the Deformation Result. d.Click Apply. Note: Maximum Deformation is These information appear at the lower right hand corner of the plot.

Workshop 8-12 NAS101 Workshops Copyright 2001 MSC.Software Corporation Step 9. Results: Create/Quick Plot, MODE 2 Create a Quick Plot of the results. a.Create / Quick Plot. b.Select Mode 2 as the result case. c.Select Eigenvectors,Translational for the Deformation Result. d.Click Apply. Note: Maximum Deformation is 23.3 These information appear at the lower right hand corner of the plot.