WS9-1 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation WORKSHOP 9 PARAMETERIZED GEOMETRY SHAPES

WS9-2 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation

WS9-3 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Problem Description u A model rocket is to be modeled using MSC.Patran. Create the shell model of the rocket surfaces using the Create / P-Shape option in MSC.Patran. Additionally, create surfaces to represent a launch pad and curved guard that protects electronic components from the rocket exhaust.

WS9-4 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Suggested Exercise Steps 1. Start MSC.Patran and create a new database rocket.db. 2. Create a cylindrical surface to model the body of the rocket. 3. Create a Parabolic surface to model the nose cone of the rocket. 4. Create triangular surfaces for the fins of the rocket. 5. Create a launch pad using a five sided box. 6. Create a curved guard for one side of the launch pad. 7. Mesh the rocket surfaces. 8. Modify the length of the rocket. 9. Note the modified mesh. 10. Modify the guard surface.

WS9-5 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 1. Create a Database Create a new database. a.File / New. b.Enter rocket as the file name. c.Click OK. d.Choose Based on Model Tolerance. e.Select MSC.Nastran as the Analysis Code. f.Select Structural as the Analysis Type. g.Click OK. a b e f d c g

WS9-6 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation n Create / P-Shape is another method for creation of surfaces. n Various surface types may be created u Rectangular u Quadrilateral u Triangular u Disc u Cylinder u Cone u Sphere u Paraboloid u Box n These surfaces may be edited, even after meshing, using the new Edit / P-Shape form. Step 2. Create a Surface

WS9-7 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 2. Create a Surface Create a cylindrical surface. a.Geometry: Create / P-Shape. b.Select the Cylinder option c.Enter 1.5 for the diameter d.Enter {[0 0 0][0 14 0]} in the Axis of Revolution box to define the axis by two points e.Click Apply to create the cylindrical surface The length of the cylinder will be determined by the length of its axis of revolution a b c d e

WS9-8 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 3. Create Another Surface Create a parabolic surface. a.Geometry: Create / P-Shape. b.Set the type to Paraboloid c.Enter 1.5 for the Diameter d.Enter {[0 18 0] [0 16 0]} for the Axis of Revolution e.Click Apply The tip of the paraboloid is the first point entered, and the length of the paraboloid is the length of the axis squared. In this case, the axis length of two units results in a paraboloid that is four units long. a b c d e

WS9-9 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 4. Create Triangular Surfaces Create triangular surfaces. a.Geometry: Create / P-Shape. b.Select the triangular type c.Enter the three corner points as shown d.Click Apply e.Repeat for a second surface a b c d e

WS9-10 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 4. Create More Triangular Surfaces Create triangular surfaces. a.Geometry: Create / P-Shape. b.Select the triangular type c.Enter the three corner points as shown d.Click Apply e.Repeat for a fourth surface a b c d e

WS9-11 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 5. Create a Launch Pad Create a five sided box. a.Geometry: Create / P-Shape. b.Select the five sided box type. c.Enter for the Edge Lengths. d.Enter {[5 0 -5][ ]} for the X-Axis. e.Enter for the Y- Vector. f.Click Apply a b c de e f

WS9-12 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 5. Create a Launch Pad Shade the surfaces to verify that the bottom was left open. a.Select the shading icon. b.Rotate the model to view the bottom of the box. a e X-Axis -Z Length Y-Vector The specified X-Axis forms one edge of the box. Then, the Y-Vector determines the direction for the Y edge length. From the right hand rule, the direction for the Z edge length is determined. A surface along the Z length direction will be left open. b

WS9-13 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 6. Create a Guard Create a cylindrical guard to be placed on one corner of the launch pad. a.Geometry: Create / P-Shape. b.Select the cylinder type. c.Enter 8.0 for the Diameter. d.Enter {[0 0 0][0 10 0]} for the Axis of Revolution. e.Click More Geometry Input… f.Enter 90 for End Angle. g.Click OK h.Click Apply The Axis of Revolution determines the height and positioning of the surface. a b c d e f g h

WS9-14 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 6. Create a Guard The completed guard should appear as shown. e f

WS9-15 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 7. Mesh the Rocket Create a mesh seed along the base of the rocket. a.Elements: Create / Mesh Seed / Uniform. b.Enter 16 for the Number of Elements. c.Select the curve at the base of the cylinder. d.Click Apply. a b c d

WS9-16 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 7. Mesh the Rocket Create a mesh on the rocket. a.Elements: Create / Mesh / Surface. b.Select surfaces 1 through 6. c.Enter a Global Edge Length of 0.5. d.Click Apply. a b c d

WS9-17 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 7. Mesh the Rocket Equivalence the mesh. a.Elements: Equivalence / All / Tolerance Cube. b.Click Apply. a b

WS9-18 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 8. Edit A Surface Edit the meshed surfaces. a.Geometry: Edit / P- Shape. b.Select Cylinder 1 c.Modify the Axis of Revolution to {[ ][ ]} d.Click Apply. a b c d

WS9-19 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 8. Edit Another Surface Edit the meshed surfaces. a.Geometry: Edit / P- Shape. b.De-Select Cylinder 1 and select Paraboloid 2. c.Modify the Axis of Revolution to {[ ][ ]} d.Click Apply. a b c d

WS9-20 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 9. Note the Modified Mesh Re-equivalence the mesh. a.Elements: Equivalence / All / Tolerance Cube. b.Click Apply. c.Notice how the modified mesh no longer is aligned with the existing mesh on the fins. a b c The mesh was automatically updated on the modified surface, but not on the adjacent surfaces. They will need to be re-meshed.

WS9-21 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 9. Note the Modified Mesh Re-mesh the fins. a.Elements: Create / Mesh / Surface. b.Select surfaces 3 through 6. c.Enter 0.5 for the Global Edge Length. d.Click Apply. a b d c c

WS9-22 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 9. Note the Modified Mesh Re-equivalence the mesh. a.Elements: Equivalence / All / Tolerance Cube. b.Click Apply. a b c

WS9-23 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 10. Modify the Guard Surface Enlarge the guard surface. a.Geometry: Edit / P- Shape. b.De-select Paraboloid 2 and select Cylinder 7. c.Click More Input/Images… d.Enter 180 for the End Angle. e.Change the Angle Origin Vector to. f.Click OK. g.Click Apply. a b g c d e f

WS9-24 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 10. Modify the Guard Surface Add a hole to the guard surface. a.Geometry: Edit / Surface / Add Hole. b.Select the Center Point option. c.Enter 0.25 for the Hole Radius. d.Select the guard surface. e.Enter [4 2 0] for the Center Point List. f.Click Apply. a b c d e f

WS9-25 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation Step 10. Modify the Guard Surface Note that the regular Edit / Surface operations may be performed on a P- Shape, but it will no longer be editable as a P-Shape.

WS9-26 PAT328, Workshop 9, May 2005 Copyright 2005 MSC.Software Corporation