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A simply supported annular plate is analyzed to determine the first natural frequencies. Example 10 from Introductory Manual for LS-DYNA Users by James M. Kennedy.

Keywords

*BOUNDARY_SPC_SET
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*ELEMENT_SHELL
*END
*KEYWORD
*MAT_ELASTIC
*NODE
*PART
*SECTION_SHELL
*SET_NODE_LIST_GENERATE
*TITLE

Reduced Input

*KEYWORD
*TITLE
Simply Supported Thin Annular Plate (fine mesh)
*CONTROL_IMPLICIT_EIGENVALUE
        10       0.0         1  1.000000         1  30.00000         2       0.0
*CONTROL_IMPLICIT_GENERAL
         1  1.000000
*CONTROL_TERMINATION
  1.000000         0       0.0       0.0       0.0
*DATABASE_BINARY_D3PLOT
  1.000000
*ELEMENT_SHELL
*NODE
*BOUNDARY_SPC_SET
*PART
         1         1         1
*SECTION_SHELL
         1         6       0.0         0         1       0.0         0         1
  0.060000  0.060000  0.060000  0.060000         0       0.0
*MAT_ELASTIC
         1  8000.0002.0000e+11  0.300000       0.0       0.0       0.0
*SET_NODE_LIST_GENERATE
         1       0.0       0.0       0.0       0.0
       193       224
*SET_NODE_LIST_GENERATE
         2       0.0       0.0       0.0       0.0
         1       192
*END

Figures

figure_screw_0ms.png

figure_screw_60ms.png

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