Modal Analysis of a Circular Plate
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1 WORKSHOP PROBLEM 6 Modal Analysis of a Circular Plate Z Objectives Reduce the model to a 30 degree section and use symmetric boundary conditions. Produce a Nastran input file. Submit the file for modal analysis in MSC/NASTRAN. Find the first three natural frequencies and mode shapes of the circular plate. MSC/NASTRAN 101 Exercise Workbook 6-1
2 6-2 MSC/NASTRAN 101 Exercise Workbook
3 WORKSHOP 6 Modal Analysis of a Circular Plate Model Description: For this example, use Lanczos method to find the first three natural frequencies and mode shapes of a circular plate that is fully clamped around the edge. In addition, model the circular plate by using a 30 degree section to reduce the size of the model. Be certain to incorporate all the necessary symmetric boundary conditions to ensure the accuracy of the analysis. Below is a finite element representation of a 30 o section of the circular plate. It also contains the geometric dimensions and boundary constraints. Table 6.1 contains the necessary parameters to construct the input file (or the model if you are a MSC/PATRAN user). Grid Coordinates and Element Connectivities in 13 5 Boundary Constraints o Table 6.1 Radius Thickness 3.5 in in Weight Density 0.3 lbs/in 3 Mass/Weight Factor 2.59E-3 sec 2 /in Young s Modulus 30.0E6 lbs/in 2 Poisson s Ratio 0.3 MSC/NASTRAN 101 Exercise Workbook 6-3
4 Suggested Exercise Steps Explicitly generate a finite element representation of the plate structure i.e., the nodes (GRID) and element connectivity (CQUAD4) should be defined manually. Define material (MAT1) and element (PSHELL) properties. a clamped boundary constraint (SPC1) to the outer curved edge, and symmetric boundary constraints (SPC1) to the two straight inner edges. Prepare the model for a normal modal analysis using Lanczos Method (SOL 103 and PARAMS). PARAM, WTMASS, PARAM, COUPMASS, 1 Generate an input file and submit it to the MSC/NASTRAN solver for normal modal analysis. Review the results, specifically the eigenvalues. 6-4 MSC/NASTRAN 101 Exercise Workbook
5 WORKSHOP 6 Modal Analysis of a Circular Plate ID SEMINAR,PROB6 CEND BEGIN BULK MSC/NASTRAN 101 Exercise Workbook 6-5
6 MSC/NASTRAN 101 Exercise Workbook
7 WORKSHOP 6 Modal Analysis of a Circular Plate ENDDATA MSC/NASTRAN 101 Exercise Workbook 6-7
8 Exercise Procedure: 1. Users who are not utilizing MSC/PATRAN for generating an input file should go to Step 11. Otherwise, proceed to step Create a new database called prob6.db. File/New Database New Database Name: prob6 In the New Model Preference form set the following: Tolerance: Analysis code: Default MSC/NASTRAN In the next few steps, you will create the necessary geometry for the plate. 3. Create a cylindrical coordinate system. Geometry Action: Create Object: Coord Method: 3Point Coord ID List: 100 Type: Cylindrical 4. Now create a curve. Geometry Action: Create Object: Curve Method: XYZ 6-8 MSC/NASTRAN 101 Exercise Workbook
9 WORKSHOP 6 Modal Analysis of a Circular Plate Vector Coordinate List: <3.5, 0, 0> Origin Coordinate List: [0, 0, 0] 5. Create a surface out of the curve you just made. Geometry Action: Create Object: Surface Method: Revolve Total Angle: 30 Curve List: Curve 1 Figure Geometry of Circular Plate Y Z X 6. Create the Finite Element Model and mesh the surface. Finite Elements MSC/NASTRAN 101 Exercise Workbook 6-9
10 Action: Create Object: Mesh Seed Type: Uniform Number of Elements Number = 7 Curve List: Curve 1, Surface 1.2 Now, change the number to 1 and select the right edge. Finite Elements Action: Create Object: Mesh Seed Type: Uniform Number of Elements Number = 1 Curve List: Surface 1.3 Mesh the surface. Finite Elements Action: Create Object: Mesh Type: Surface Node Coordinate Frames... Analysis Coordinate Frame: Coord 100 Refer. Coordinate Frame: Coord 100 Surface List: Surface MSC/NASTRAN 101 Exercise Workbook
11 WORKSHOP 6 Modal Analysis of a Circular Plate Click on if a warning message appears about triangle elements. Figure Circular Plate Mesh Y Y Z Z X X 7. Now you will create the Material Properties for the plate. Materials Action: Create Object: Isotropic Method: Manual Input Material Name: mat_1 Input Properties... Elastic Modulus = 30.0E6 MSC/NASTRAN 101 Exercise Workbook 6-11
12 Poisson Ratio = 0.3 Density = 0.3 In the Current Constitutive Models, you will see Linear Elastic - [,,,,] - [Active] appear. Click on Cancel to close the form. Cancel 8. Give the plate a thickness using Properties. Properties Action: Create Dimension: 2D Type: Shell Property Set Name: Input Properties... Material Name: plate m:mat_1 Thickness: Select Members: Surface 1 Add 9. Next you will apply the constraints to the model. First, constrain the outer edge from moving through all Degrees of Freedom. Loads/BCs Action: Create Object: Displacement Type: Nodal 6-12 MSC/NASTRAN 101 Exercise Workbook
13 WORKSHOP 6 Modal Analysis of a Circular Plate New Set Name: Input Data... Figure Node IDs fixed Translations <T1 T2 T3> <0, 0, 0> Rotations <R1 R2 R3> <0, 0, 0> Analysis Coordinate Frame: Coord 100 Select Application Region... Geometry Filter: FEM Select Nodes: Node 8 15 (see Fig 6.3) Add Y Y Z Z X X MSC/NASTRAN 101 Exercise Workbook 6-13
14 Next, constrain the inside point from moving in all directions but the Z- direction. Loads/BCs Action: Create Object: Displacement Type: Nodal New Set Name: Input Data... Finally, constrain the upper and lower edge from moving in the Y-direction, and from moving in the R1 and R3 rotations. tip Translations <T1 T2 T3> <0, 0, > Rotations <R1 R2 R3> <0, 0, 0> Analysis Coordinate Frame: Coord 100 Select Application Region... Geometry Filter: FEM Select Nodes: Node 1 (see fig 6.3) Add Loads/BCs Action: Create Object: Displacement Type: Nodal New Set Name: Input Data... symmetry_edge Translations <T1 T2 T3> <, 0, > 6-14 MSC/NASTRAN 101 Exercise Workbook
15 WORKSHOP 6 Modal Analysis of a Circular Plate Rotations <R1 R2 R3> < 0,, 0> Analysis Coordinate Frame: Coord 100 Select Application Region... Geometry Filter Figure Nodal Constraints FEM Select Nodes Node 2:7 9:14 (see fig 6.3) Add (CID=100) 246(CID=100) 246(CID=100) 246(CID=100) 246(CID=100) 246(CID=100) 246(CID=100) 12456(CID=100) 246(CID=100) 246(CID=100)246(CID=100) 246(CID=100)246(CID=100)246(CID=100)123456(CID=100) Y Z X 10. Next, you will run the analysis. Analysis Action: Analyze Object: Entire Model MSC/NASTRAN 101 Exercise Workbook 6-15
16 Method: Analysis Deck Solution Type... Solution Type: NORMAL MODES Solution Parameters... Mass Calculation: Coupled Wt.-Mass Conversion = An MSC/NASTRAN input file called prob6.bdf will be generated. This process of translating your model into an input file is called the Forward Translation. The Forward Translation is complete when the Heartbeat turns green. MSC/PATRAN Users should proceed to step MSC/NASTRAN 101 Exercise Workbook
17 WORKSHOP 6 Modal Analysis of a Circular Plate Generating an input file for MSC/NASTRAN Users: MSC/NASTRAN users can generate an input file using the data from table 6.1. The result should be similar to the output below. 11. MSC/NASTRAN Input File: prob6.dat. ID SEMINAR,PROB6 TIME 5 SOL 103 CEND TITLE = FIXED CIRCULAR PLATE SUBTITLE = NORMAL MODES SPC = 20 METHOD = 1 DISP = ALL BEGIN BULK CORD2C,100,,0.0,0.0,0.0,0.0,0.0,1.0,1.0,0.0,0.0 GRID,1,100,0.0,0.0,0.0,100 =,*1,=,*0.5,== =6 GRID,9,100,0.5,30.0,0.0,100 =,*1,=,*0.5,== =5 CTRIA3,1,20,1,2,9 CQUAD4,2,20,2,3,10,9 =,*1,=,*1,*1,*1,*1 =4 PSHELL,20,30,0.125,30,,30 MAT1,30,30.+6,,.3,.3 PARAM,WTMASS, PARAM,COUPMASS,1 SPC,20,1,12456,0.0 SPC,20,8,123456,0.0 SPC,20,15,123456,0.0 SPC1,20,2,2,THRU,8 SPC1,20,2,9,THRU,15 EIGRL,1,,,3 ENDDATA MSC/NASTRAN 101 Exercise Workbook 6-17
18 Submit the input file for analysis 12. Submit the input file to MSC/NASTRAN for analysis. 12a. To submit the MSC/PATRAN.bdf file for analysis, find an available UNIX shell window. At the command prompt enter: nastran prob6.bdf scr=yes. Monitor the run using the UNIX ps command. 12b. To submit the MSC/NASTRAN.dat file for analysis, find an available UNIX shell window. At the command prompt enter: nastran prob6 scr=yes. Monitor the run using the UNIX ps command. 13. When the run is complete, edit the prob6.f06 file and search for the word FATAL. If no matches exist, search for the word WARNING. Determine whether existing WARNING messages indicate modeling errors. 14. While still editing truss.f06, search for the word: E I G E N (spaces are necessary) 1st = Hz 2nd = Hz 3rd = Hz 6-18 MSC/NASTRAN 101 Exercise Workbook
19 WORKSHOP 6 Modal Analysis of a Circular Plate Comparison of Results 15. Compare the results obtained in the.f06 file with the results on the following page: MSC/NASTRAN 101 Exercise Workbook 6-19
20 6-20 MSC/NASTRAN 101 Exercise Workbook MODE EXTRACTION EIGENVALUE RADIANS CYCLES GENERALIZED GENERALIZED NO. ORDER MASS STIFFNESS E E E E E E E E E E E E E E+09
21 WORKSHOP 6 Modal Analysis of a Circular Plate 16. MSC/NASTRAN Users have finished this exercise. MSC/PATRAN Users should proceed to the next step. 17. Proceed with the Reverse Translation process; that is, importing the prob6.op2 results file into MSC/PATRAN. To do this, return to the Analysis form and proceed as follows: Analysis Action: Read OP2 Object: Result Entities Method: Translate Select Results File... Selected Results File: prob6.op2 18. When the translation is complete bring up the Results form. Results Action: Create Object: Fringe Select Result Case(s): Select Fringe Result: Quantity: Default, Mode 1: Freq=980.1 Eigenvectors, Translational Z Component To change the target entites of the plot, click on the Target Entities icon. Target Entities Target Entity: Addtl. Display Control: Current Viewport Faces MSC/NASTRAN 101 Exercise Workbook 6-21
22 To change the display attributes of the plot, click on the Display Attributes icon. Display Attributes Element Shrink Factor: 0.15 To change the plot options, click on the Plot Options icon. Plot Options Coordinate Transformation: CID Select Coordinate Frame: Coord a. Next add the deformation options to the plot. Results Action: Create Object: Deformation Select Result Case(s): Select Deformation Result: Show As: XX YY ZZ Default, Mode 1: Freq=980.1 Constraint Forces, Tranlational Component To change the display attributes of the plot, click on the Display Attributes icon. Display Attributes Scale Factor: 0.03 Show Undeformed Line Style: 6-22 MSC/NASTRAN 101 Exercise Workbook
23 WORKSHOP 6 Modal Analysis of a Circular Plate To change the plot options, click on the Plot Options icon. Plot Options Coordinate Transformation: CID Select Coordinate Frame: Coord 100 You may reset the graphics if you click on this icon: Reset Graphics You can go back and select any Results Case, Fringe Results or Deformation Results you are interested in. Quit MSC/PATRAN when you are finished with this exercise. MSC/NASTRAN 101 Exercise Workbook 6-23
24 6-24 MSC/NASTRAN 101 Exercise Workbook
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