WS13a-1 WORKSHOP 13A MODAL ANALYSIS OF A CAR CHASSIS NAS122, Workshop 13a, August 2005 Copyright 2005 MSC.Software Corporation.

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WS13a-1 WORKSHOP 13A MODAL ANALYSIS OF A CAR CHASSIS NAS122, Workshop 13a, August 2005 Copyright 2005 MSC.Software Corporation

WS13a-2 NAS122, Workshop 13a, August 2005 Copyright 2005 MSC.Software Corporation

WS13a-3 NAS122, Workshop 13a, August 2005 Copyright 2005 MSC.Software Corporation MODAL ANALYSIS OF A CAR CHASSIS n Problem Description u The purpose of this workshop is to perform a Normal Modes analysis of a Body-in-White model of a car.

WS13a-4 NAS122, Workshop 13a, August 2005 Copyright 2005 MSC.Software Corporation MODAL ANALYSIS OF A CAR CHASSIS n Suggested Exercise Steps 1. Import the car geometry from a Nastran Input File. 2. Submit the model to Nastran for a Normal Modes analysis. 3. Attach the XDB result file after the analysis is completed. 4. Use the Quick Plot feature in the Result Menu to visualize the Eigenvector of the model.

WS13a-5 NAS122, Workshop 13a, August 2005 Copyright 2005 MSC.Software Corporation CREATE NEW DATABASE Create a new database called car.db. a.File / New. b.Enter car as the file name. c.Click OK. d.Choose Default Tolerance. e.Select MSC.Nastran as the Analysis Code. f.Select Structural as the Analysis Type. g.Click OK. a b c d e f g

WS13a-6 NAS122, Workshop 13a, August 2005 Copyright 2005 MSC.Software Corporation Step 1. File / Import Import the model from a Nastran Input File. a.File / Import. b.Select MSC.Nastran Input as the Source. c.Select car.bdf and click Apply. d.Click OK when the Nastran Input File Import Summary appears. b c a c

WS13a-7 NAS122, Workshop 13a, August 2005 Copyright 2005 MSC.Software Corporation Step 2. Analysis: Analyze / Entire Model / Full Run Submit the model for analysis. a.Analysis: Analyze / Entire Model / Full Run. b.Enter car_normal_modes as the Job Name. c.Click on Solution Type. d.Select NORMAL MODES. e.Click OK. f.Click Apply. a c d f e b

WS13a-8 NAS122, Workshop 13a, August 2005 Copyright 2005 MSC.Software Corporation Step 3. Analysis: Access Results / Attach XDB / Result Entities Attach the XDB result file. a.Analysis: Access Results / Attach XDB / Result Entities. b.Click on Select Result File. c.Select car_normal_modes.xdb. d.Click OK. e.Click Apply. a b c d e

WS13a-9 NAS122, Workshop 13a, August 2005 Copyright 2005 MSC.Software Corporation Step 4. Results: Create / Quick Plot Create a Deformation and Fringe plot of the normal modes. a.Results: Create / Quick Plot. b.Select the Mode 7. c.Select Eigenvector, Translational in both Result boxes. d.Click Apply. a b c d c

WS13a-10 NAS122, Workshop 13a, August 2005 Copyright 2005 MSC.Software Corporation Summary Summary of Frequencies and Modes for project _______________ ModeFreq (Hz) Description