Modal Analysis of A Flat Plate using Static Reduction
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1 WORKSHOP PROBLEM 2 Modal Analysis of A Flat Plate using Static Reduction Objectives Reduce the dynamic math model, created in Workshop 1, to one with fewer degrees of freedom. Apply the static reduction to the model. Submit the file for analysis in MSC/NASTRAN. Find the first five natural frequencies and mode shapes of the flat plate. MSC/NASTRAN for Windows 102 Exercise Workbook 2-1
2 2-2 MSC/NASTRAN for Windows 102 Exercise Workbook
3 WORKSHOP 2 Modal Analysis of a Flat Plate using Static Reduction Model Description: For this example, reduce the dynamic math model created in Workshop 1, using static reduction. Then find the first five natural frequencies and mode shapes using the Automatic Givens method. Use the points indicated in Figure 2.2 for the A-set. Figure Grid Coordinates and Element Connectivities b a MSC/NASTRAN for Windows 102 Exercise Workbook 2-3
4 Figure Loads and Boundary Conditions Table Properties Length (a) Height (b) Thickness 5 in 2 in in Weight Density lbs/in 3 Mass/Weight Factor 2.59E-3 sec 2 /in Youngs Modulus 30.0E6 lbs/in 2 Poisson s Ratio MSC/NASTRAN for Windows 102 Exercise Workbook
5 WORKSHOP 2 Modal Analysis of a Flat Plate using Static Reduction Exercise Procedure: 1. Start up MSC/NASTRAN for Windows 3.0 and begin to create a new model. Double click on the icon labeled MSC/NASTRAN for Windows V3.0. On the Open Model File form, select New Model. Open Model File: New Model 2. Import prob1.dat. File/Import/Analysis Model... Nastran MSC/Nastran Change the directory to C : \temp. File name: Open prob1.dat When ask, Ok, to Adjust all massess by PARAM, WTMASS factor of ?, answer No. This information will be entered during analysis. No To reset the display of the model do the following: View/Redraw View/Autoscale 3. Create the static reduction constraint. Model/Constraint/Set... ID: 2 Title: reduction MSC/NASTRAN for Windows 102 Exercise Workbook 2-5
6 Now define the relevant constraint for the model. Model/Constraint/Nodal... Select the circled nodes by clicking on them, as shown in Figure 2.2 or manually input the selection as follows. ID: 3 to: 11 by: 2 More ID: 25 to: 33 by: 2 More ID: 47 to: 55 by: 2 More On the DOF box, select these translational and rotational D.O.F. TZ RX RY Cancel 4. Create the input file for analysis. File/Export/Analysis Model... Type: 2..Normal Modes/Eigenvalue Change the directory to C:\temp. File name: Write prob2 Run Analysis Advanced... Modal Solution Method: Eigenvalues and Eigenvectors/ Number Desired: Lanczos MSC/NASTRAN for Windows 102 Exercise Workbook
7 WORKSHOP 2 Modal Analysis of a Flat Plate using Static Reduction Mass: Problem ID: Coupled Modal Analysis with Reduction Under Output Requests, unselect all except: Displacement Under Analysis Case Request, select the following: Constraint (SPC) = 1..NASTRAN SPC 1 Under PARAM, enter the following: WTMASS Under Analysis Set, enter the following: ASET 2..reduction 5. When asked if you wish to save the model, respond Yes. Yes File name: Save prob2 When the MSC/NASTRAN manager is through running, MSC/ NASTRAN will be restored on your screen, and the Message Review form will appear. To read the messages, you could select Show Details. Since the analysis ran smoothly, we will not bother with the details this time. Continue MSC/NASTRAN for Windows 102 Exercise Workbook 2-7
8 6. View the results of the analysis. To get a better view of the deformation, you will want to rotate the model as follows: View/Rotate... Dimetric View/Select... Deformed Style: Deformed and Contour Data... Deform Click on the Output Set listbox to get all modal frequencies. Answer the following questions: What is the frequency for: Mode 1 = Mode 2 = Mode 3 = Mode 4 = Mode 5 = Compare these five results to the results of Workshop 1. To view a mode shape, select one of the modes. View the results of the analysis. When finished, exit MSC/NASTRAN for Windows. File/Exit This concludes this exercise. 2-8 MSC/NASTRAN for Windows 102 Exercise Workbook
9 WORKSHOP 2 Modal Analysis of a Flat Plate using Static Reduction MSC/NASTRAN for Windows 102 Exercise Workbook 2-9
10 Mode Hz Mode Hz Mode Hz Mode Hz Mode Hz 2-10 MSC/NASTRAN for Windows 102 Exercise Workbook
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