A simply supported annular plate is analyzed to determine the first natural frequencies. Example 9 from Introductory Manual for LS-DYNA Users by James M. Kennedy..
*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
*KEYWORD *TITLE Simply Supported Thin Annular Plate (coarse 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 16 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 79 104 *SET_NODE_LIST_GENERATE 2 0.0 0.0 0.0 0.0 1 78 *END