PAT312, Section 67, December 2006 S67-1 Copyright 2007 MSC.Software Corporation SECTION 67 RADIATION SYMMETRY

PAT312, Section 67, December 2006 S67-2 Copyright 2007 MSC.Software Corporation

PAT312, Section 67, December 2006 S67-3 Copyright 2007 MSC.Software Corporation SYMMETRY View Factors typically introduce asymmetry into otherwise symmetric models Symmetry operators in P/VIEWFACTOR Reduce Analysis Time Caution must be exercised as view factor symmetry is more complicated than ordinary geometric symmetry

PAT312, Section 67, December 2006 S67-4 Copyright 2007 MSC.Software Corporation SYMMETRY OPERATORS SUPPORTED 2-D XY SPACE REFLECTION ABOUT A LINE ROTATION ABOUT AN AXIS COMBINATIONS 3-D XYZ SPACE REFLECTION ABOUT A PLANE ROTATION ABOUT AN AXIS COMBINATIONS Up to 3 reflections and 1 rotation 2-D RZ (AXISYMMETRIC) SPACE REFLECTION ABOUT A LINE (PERPENDICTULAR TO Z-AXIS)

PAT312, Section 67, December 2006 S67-5 Copyright 2007 MSC.Software Corporation Rotation of 72 degrees repeated 4 times about an axis ROTATION IN 2D XY SPACE

PAT312, Section 67, December 2006 S67-6 Copyright 2007 MSC.Software Corporation ROTATION IN 2D XY SPACE

PAT312, Section 67, December 2006 S67-7 Copyright 2007 MSC.Software Corporation COMBINED SYMMETRY OPERATIONS IN 2-D XY SPACE

PAT312, Section 67, December 2006 S67-8 Copyright 2007 MSC.Software Corporation ROTATION IN 3-D XYZ SPACE

PAT312, Section 67, December 2006 S67-9 Copyright 2007 MSC.Software Corporation ROTATION IN 3-D XYZ SPACE

PAT312, Section 67, December 2006 S67-10 Copyright 2007 MSC.Software Corporation COMBINED SYMMETRY OPERATIONS IN 3-D XYZ SPACE

PAT312, Section 67, December 2006 S67-11 Copyright 2007 MSC.Software Corporation SYMMETRY OPERATIONS IN AXISYMMETRIC RZ SPACE

PAT312, Section 67, December 2006 S67-12 Copyright 2007 MSC.Software Corporation SYMMETRY OPERATORS IN MSC.PATRAN THERMAL Reflection about a planeRadiation symmetry tri with type I nodes Reflection about a lineRadiation symmetry bar reflection element with type I nodes Rotation about an axisRadiation symmetry bar rotation element with type I nodes Node type I (Information) Not required when using nodes on the structure Must be applied to 0D point elements

PAT312, Section 67, December 2006 S67-13 Copyright 2007 MSC.Software Corporation EXAMPLE OF THE USE OF SYMMETRY

PAT312, Section 67, December 2006 S67-14 Copyright 2007 MSC.Software Corporation SYMMETRY EXAMPLE

PAT312, Section 67, December 2006 S67-15 Copyright 2007 MSC.Software Corporation

PAT312, Section 67, December 2006 S67-16 Copyright 2007 MSC.Software Corporation