WS15d-1 WORKSHOP 15D MODAL ANALYSIS OF TUNING FORK USING COARSE MESH WITH TET4 ELEMENTS NAS122, Workshop 15d, August 2005 Copyright 2005 MSC.Software Corporation

WS15d-2 NAS122, Workshop 15d, August 2005 Copyright 2005 MSC.Software Corporation

WS15d-3 NAS122, Workshop 15d, August 2005 Copyright 2005 MSC.Software Corporation MODAL ANALYSIS OF A TUNING FORK n Problem Description u The purpose of this workshop is to create a coarse mesh of the tuning fork using TET4 elements and compare the resulting eigenvalue and eigenvectors to that obtained in Workshop 15c.

WS15d-4 NAS122, Workshop 15d, August 2005 Copyright 2005 MSC.Software Corporation MODAL ANALYSIS OF A TUNING FORK n Suggested Exercise Steps 1. Open the database created in Workshop 15a. 2. Delete the finite elements that are on the model. 3. Mesh the model with TET4 elements and use 0.25 for the Global Edge Length. 4. Submit the model to Nastran for a Normal Modes analysis. 5. Attach the XDB result file after the analysis is completed. 6. Use the Deformation feature in the Result Menu to visualize the Eigenvector of the model.

WS15d-5 NAS122, Workshop 15d, August 2005 Copyright 2005 MSC.Software Corporation Step 1. File / Open Open the database created in Workshop 15a. a.File / Open. b.Select tuning fork.db as the file name. c.Click OK. a b c

WS15d-6 NAS122, Workshop 15d, August 2005 Copyright 2005 MSC.Software Corporation Step 2. Elements: Delete / Any Delete the finite elements generated before. a.Elements: Delete / Any. b.Use the rectangular picking option to pick all the elements. c.Click Apply. a b c

WS15d-7 NAS122, Workshop 15d, August 2005 Copyright 2005 MSC.Software Corporation Step 3. Elements: Create / Mesh / Solid Create the finite element mesh for the model. a.Elements: Create / Mesh / Solid. b.Use Tet for Elem Shape. c.Select Tet4 for the Topology. d.Pick the solid model from the screen for the Input List. e.Uncheck the Automatic Calculation box. f.Enter a Value of 0.4. g.Click Apply. a b c d e g f

WS15d-8 NAS122, Workshop 15d, August 2005 Copyright 2005 MSC.Software Corporation Step 4. Analysis: Analyze / Entire Model / Full Run Submit the tuning fork for normal modes analysis. a.Analysis: Analyze / Entire Model / Full Run. b.Enter tuning_fork_tet4_coarse for the Job Name. c.Click on Solution Type. d.Select NORMAL MODES. e.Click on Solution Parameters. f.Change the Wt-Mass Conversion to g.Click OK on both sub-forms. h.Click Apply to submit the model for analysis. a b d e f g g h c

WS15d-9 NAS122, Workshop 15d, August 2005 Copyright 2005 MSC.Software Corporation Step 5. Analysis: Access Results / Attach XDB / Result Entities Attach the XDB result file. a.Analysis: Access Results / Attach XDB / Result Entities. b.Click on Select Results File… c.Select tuning_fork_tet4_coarse.xdb. d.Click OK. e.Click Apply. a b c d e

WS15d-10 NAS122, Workshop 15d, August 2005 Copyright 2005 MSC.Software Corporation Step 6. Results: Create / Deformation Create a Deformation Plot of the models Mode Shape. a.Results: Create / Deformation b.Select the A4: Mode 7. c.Select Eigenvector, Translational in the Select Deformation Result box. d.Click Apply. b a c d

WS15d-11 NAS122, Workshop 15d, August 2005 Copyright 2005 MSC.Software Corporation Summary Summary of Frequencies and Modes for project _______________ ModeFreq (Hz) Description

WS15d-12 NAS122, Workshop 15d, August 2005 Copyright 2005 MSC.Software Corporation