WORKSHOP 5 COORDINATE SYSTEMS

WS5-2 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation

WS5-3 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation l Workshop Objectives l Understand the difference between Reference Coordinate System and Displacement Coordinate System l Problem Description l Create two coordinate systems l Use one coordinate system to define the model l Use the second coordinate system to define the displacement coordinate system

WS5-4 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation l Suggested Exercise Steps 1. Create a new database 2. Create a square surface 3. Mesh the surface to create 2D elements. 4. Create material properties. 5. Create physical properties. 6. Create a Nastran input file 7. Review the Nastran input file 8. Create two coordinate systems 9. Modify the nodal coordinate systems 10. Create a new Nastran input file 11. Review the new Nastran input file

WS5-5 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation b c d f g Step 1. Create New Database Create a new database called coord_system.db a.File / New. b.Enter coord_system as the file name. c.Click OK. d.Choose Tolerance Based on Model. e.Select MSC.Nastran as the Analysis Code. f.Select Structural as the Analysis Type. g.Click OK. a e

WS5-6 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation Step 2. Create Geometry Create a 1 x 1 surface a.Geometry: Create / Surface / XYZ b.Click Apply. a b

WS5-7 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation Step 3. Mesh the Surface Mesh the surface a.Elements: Create / Mesh / Surface b.Screen pick the surface c.Enter 0.3 as the Global Edge Length d.Click Apply. a b c d

WS5-8 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation Step 4. Create Material Properties Create an isotropic material a.Materials: Create / Isotropic / Manual Input. b.Enter steel for the Material Name. c.Click Input Properties. d.Enter 30e6 for the Elastic Modulus. e.Enter 0.3 for the Poisson Ratio. f.Click OK. g.Click Apply. d f e a c b g

WS5-9 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation Step 5. Create Physical Properties Create physical properties a.Properties: Create / 2D / Shell b.Enter plate as the Property Set Name. c.Click Input Properties. d.Click on the Select Material Icon. e.Click on steel to select it f.Enter 0.1 as the thickness g.Click OK. d f e g a b c

WS5-10 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation Apply the physical properties a.Click in the Select Members box. b.Screen pick the surface c.Click Add. d.Click Apply. Step 5. Create Physical Properties b a c d

WS5-11 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation Step 6. Create a Nastran Input File Create a Nastran input file a.Analysis: Analyze / Entire Model / Analysis Deck b.Click Apply. a b

WS5-12 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation Step 7. Review the Nastran Input File Examine the Nastran input file a.Open the directory in which your database is saved. b.Find the file titled coord_system.bdf c.Open this file with any text editor and review it. d.Notice that field 3 and field 7 of the GRID entries are blank which means the basic coordinate system (coordinate system 0) is used here. Field 3 Field 7

WS5-13 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation Step 8. Create a new coordinate system Create a new coordinate system a.Geometry: Create / Coord / Euler b.Enter 100 as the Coord ID c.Screen pick point 3 as the origin a b c

WS5-14 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation Step 8. Create a second coordinate system Create another coordinate system a.Geometry: Create / Coord / Euler b.Enter 200 as the Coord ID c.Click Rotation Parameters d.Enter 45 as the angle of rotation about the z axis e.Click OK f.Click in the Origin box g.Screen pick point 4 as the origin a b c d e f g

WS5-15 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation Step 9. Modify the nodal coordinate frames Modify the Reference Coordinate Frame a.Elements: Modify / Node / Edit b.Check the Refer. Coordinate Frame box c.Rectangular select all nodes d.Click in the Refer. Coordinate Frame box e.Screen pick coord frame 100 f.Click Apply. a b c d e f

WS5-16 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation Step 9. Modify the nodal coordinate frames Modify the Analysis Coordinate Frame a.Elements: Modify / Node / Edit b.Uncheck the Refer. Coordinate Frame box and check the Analysis Coordinate Frame box c.Rectangular select the lower row of nodes d.Click in the Analysis Coordinate Frame box e.Screen pick coord frame 200 f.Click Apply. a b c d e f

WS5-17 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation Step 10. Create a new Nastran Input File Create a Nastran input file a.Analysis: Analyze / Entire Model / Analysis Deck b.Enter coord_system_rev1 as the Job Name c.Click Apply. a b c

WS5-18 NAS120, Workshop 5, May 2006 Copyright 2005 MSC.Software Corporation Step 11. Review the new Nastran Input File Examine the Nastran input file a.Open the directory in which your database is saved. b.Find the file titled coord_system_rev1. bdf c.Open this file with any text editor and review it. d.Notice that field 3 and field 7 of the GRID entries have been changed. Field 3 Field 7