FRF for a rectangular plate

This example shows how to setup the keywords for FRF computation. A nodal force excitation is defined. Frequency dependent response amplitudes at nodes are computed. Differences between constant and mode dependent modal damping can be studied. Example 4.1 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.

*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_NONLINEAR
*CONTROL_SHELL
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*FREQUENCY_DOMAIN_FRF
*KEYWORD 
*MAT_ELASTIC
*NODE
*PART
*SECTION_SHELL
*SET_NODE_LIST
*TITLE

*KEYWORD  
*TITLE
A rectangular plate for FRF computation.
*FREQUENCY_DOMAIN_FRF
       131         0        -3         3         0 2000.0000         0         0
     0.000         5         1     0.000     0.000
         1         1         3         1
  1.000000 400.00000       400         0         0         0
*CONTROL_IMPLICIT_EIGENVALUE
       100     0.000         0     0.000         0     0.000         0     0.000
         0         0         0         0
*CONTROL_IMPLICIT_GENERAL
         1  1.000000         0         0         0         0         0         0
*CONTROL_IMPLICIT_NONLINEAR
         1         0         0     0.000     0.000     0.000     0.000     0.000
         0         0         0         0
         0         0     0.000         1         2
*CONTROL_SHELL
 20.000000         2        -1         0         2         2         1         0
  1.000000         0         0         1         0         0         0         0
         0         0         0
*PART
boxshell
         1         1         1         0         0         0         0         0
*SECTION_SHELL
         1         6  0.833000         3         3         0         0         0
  0.002000  0.002000  0.002000  0.002000     0.000     0.000     0.000         0
*MAT_ELASTIC
         1 7870.00002.0700E+11  0.292000     0.000     0.000         0
*DEFINE_CURVE
         5         0     0.000     0.000     0.000     0.000         0
           1.0000000               0.000
           6.0000000               0.000
           7.0000000           0.0045000
           8.0000000           0.0071300
           9.0000000           0.0038600
          10.0000000           0.0032800
          11.0000000           0.0034000
          12.0000000           0.0062400
          13.0000000             7.2e-04
          14.0000000             8.3e-04
          15.0000000               0.000
         200.0000000               0.000
*SET_NODE_LIST
         1     0.000     0.000     0.000     0.000          
       131       651         0         0         0         0         0         0
*ELEMENT_SHELL
*NODE
*END