# FRF of a plate with pressure — Welcome to LS-DYNA Examples

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This example shows how to use *FREQUENCY_DOMAIN_FRF for a plate with pressure excitation. Example 4.5 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.

## Keywords

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

## Reduced Input

```*KEYWORD
*TITLE
Benchmark example for FRF computation.
*FREQUENCY_DOMAIN_FRF
1         2        -3         4         0
0.01
1         1         3         1
1000.0    2000.0      1001         0         0         0
*BOUNDARY_SPC_SET
2         0         1         1         1
*CONTROL_IMPLICIT_EIGENVALUE
50     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        18  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
*SET_NODE_LIST
1     0.000     0.000     0.000     0.000
131       326         0         0         0         0         0         0
*SET_NODE_LIST
2     0.000     0.000     0.000     0.000
20        19        18        17        16        15        14        13
12        11        10         9         8         7         6         5
4         3         2         1        21        22        23        24
25        26        27        28        29        30        31       217
186       155       124        93        62       248       279       310
341       372       403       434       465       496       527       558
589       620       651       311       342       373       404       435
466       497       528       559       590       621       280       249
218       187       156       125        94        63        32       631
632       633       634       635       636       637       638       639
640       641       642       643       644       645       646       647
648       649       650       630       629       628       627       626
625       624       623       622         0         0         0         0
*ELEMENT_SHELL
*NODE
*END

```