Normal Modes Analysis of a Simply-Supported Stiffened Plate
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1 APPENDIX C Normal Modes Analysis of a Simply-Supported Stiffened Plate Objectives: Manually convert a Linear Static analysis (Sol 101) input file to a Normal Modes analysis (Sol 103) input file. Learn how to generate weight information for your model. Submit a Normal Modes analysis to MSC/NASTRAN. Import both model AND results into MSC/PATRAN via the MSC/NASTRAN binary results file (.op2). Review the results of a Normal Modes analysis. Visualize modal shapes. MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
2 C-2 MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
3 APPENDIX C Stiffened Plate (Sol 103) Objectives: Use MSC/PATRAN to convert a Linear Static analysis (Sol 101) input file to a Normal Modes analysis (Sol 103) input file. Learn how to generate weight information for your model. Submit a Normal Modes analysis to MSC/NASTRAN. Import both model AND results into MSC/PATRAN via the MSC/NASTRAN binary results file (.op2). Review the results of a Normal Modes analysis. Visualize modal shapes. MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) C-3
4 Model Description: The model used for this exercise is identical to the model used for Lesson b Stiffener 5.0 (typ) A 2.0 a a A Y Z X View A-A b 1.0 Elastic Modulus: 10.3E6 psi Poisson Ratio: 0.3 Density: lbs/in 3 Plate Thickness: 0.1 in Bar cross sectional area: 0.38 in 2 Iaa: in 4 Ibb: in 4 J: in 4 C-4 MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
5 APPENDIX C Stiffened Plate (Sol 103) Exercise Procedure: 1. The input file you will be working with is called nas120ex11_work.bdf. This input file is identical to solution input file for Exercise 8. Your task is to edit this file so that the MSC/NASTRAN solver will extract the first five normal modes. 2. Input file items that you will need to consider: Entry Comments FMS SOL What solution sequence should we be using for a Normal Modes analysis? Case Control LOAD METHOD SPCFORCES, STRESS What is the significance of an externally applied load with respect to an eigenvalue problem? How does the solver know what eigenvalue extraction parameters to use? What is the significance of the force & stress results with respect to an eigenvalue problem? Bulk Data (PARAMs) COUPMASS GRDPNT EIGRL Which mass matrix formulation should be used? Lumped or consistent? What useful information can result from this entry? How does this entry relate to a Normal Modes analysis? 3. Create a new database named nas120ex11.db. File/New... New Database Name: lesson11 In the New Model Preferences form set the following: Tolerance: Analysis Code: Default MSC/NASTRAN MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) C-5
6 Analysis Type: Structural 4. Import the existing linear static model into MSC/ PATRAN. To do this, go to the Analysis form and proceed as follows: Analysis Action: Read Input File Object: Model Data Method: Translate Select Input File... Filter Selected Input File:??? (Select the desired.bdf file) Apply When the translation is complete and the Heartbeat turns green, review the NASTRAN Input File Import Summary and reject cards to ensure that no necessary entries are omitted. 5. Now use MSC/PATRAN to convert the linear static input file to a normal modes input file. Analysis Action: Analyze Object: Entire Model Method: Analysis Deck Job Name: Translation Parameters... lesson11_mode OUTPUT2 Format: Binary MSC/NASTRAN Version:??? Set accordingly, here it is 70 C-6 MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
7 APPENDIX C Stiffened Plate (Sol 103) Solution Type... Solution Type: Solution Parameters... Normal Modes Database Run Automatic Constraints Mass Calculation: Data Deck Echo: Coupled Sorted Wt.- Mass Conversion = (For English units) Node ID for Wt. Gener. = 0 Subcase Create... Available Subcases: LOAD_STATIC.SCI Subcase Parameters... Number of desired roots: 5 Apply Cancel Subcase Select... Subcase Selected: Default (Click to deselect) Subcase for solution sequence: LOAD_STATIC.SCI MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) C-7
8 Finally, click on Apply to create the input file. 6. After you complete your revisions, submit the input file to the MSC/NASTRAN solver for analysis. To do this, find an available xterm window and at the prompt enter: nastran nas120ex11_mode.bdf scr=yes Monitor the run using the UNIX ps command. 7. When the run is completed, edit the nas120ex11_mode.f06 file and search for the word FATAL. If none exists, search for the word WARNING. Determine whether or not existing WARNING messages indicate modeling errors. 8. While still editing nas120ex11_mode.f06, search for the word: W E I G H T (spaces are necessary) What is the weight of our structure? weight = Where is the Center of the Gravity (C.G.) located? X-C.G. = Y-C.G. = Z-C.G. = Search for the word: R E A L (spaces are necessary). What are the first 5 modal frequencies for our structure? mode 1 mode 2 mode 3 mode 4 Hz Hz Hz Hz C-8 MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
9 APPENDIX C Stiffened Plate (Sol 103) mode 5 Hz MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) C-9
10 C-10 MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
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