# BEM acoustics of a rectangular plate III — Welcome to LS-DYNA Examples

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This is a third example of a recangular plate subjected to nodal force excitation. *FREQUENCY_DOMAIN_ACOUSTIC_BEM is used for running a vibro-acoustic problem with Kirchhoff Method. Example 8.3 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.

## Keywords

```*BOUNDARY_NON_REFLECTING
*CONTROL_ENERGY
*CONTROL_HOURGLASS
*CONTROL_TERMINATION
*CONTROL_TIMESTEP
*DAMPING_FREQUENCY_RANGE
*DATABASE_BINARY_D3PLOT
*DATABASE_BINARY_D3THDT
*DATABASE_GLSTAT
*DEFINE_CURVE
*ELEMENT_SOLID
*END
*FREQUENCY_DOMAIN_ACOUSTIC_BEM
*KEYWORD
*MAT_ACOUSTIC
*MAT_ELASTIC
*NODE
*PART
*PART
*SECTION_SHELL
*SECTION_SOLID
*SET_NODE_LIST
*SET_SEGMENT
*TITLE

```

## Reduced Input

```*KEYWORD
*TITLE
acoustic field generated by a vibrating plate, by Kirchhoff method
*FREQUENCY_DOMAIN_ACOUSTIC_BEM
1.210000 340.00000 28.000000 350.00000       162     0.001     0.000 2.0000E-5
1         1         0         0         4
1         0     0.000         0
1
1         1         0         0
*CONTROL_ENERGY
2         0         0         0
*CONTROL_HOURGLASS
0     0.000
*CONTROL_TERMINATION
1.024000         0     0.000     0.000     0.000
*CONTROL_TIMESTEP
0.000  0.900000         0     0.000 -1.100E-6         0         0         0
0.000         0         0
*DATABASE_GLSTAT
1.0000E-4         0         0         1
*DATABASE_BINARY_D3PLOT
0.005000         0         0         0         0
0
*DATABASE_BINARY_D3THDT
0.001000         0         0         0         0
*BOUNDARY_NON_REFLECTING
1     0.000     0.000
477         3         1     0.000         0         0         0         0
*PART

1         1         1         0         0         0         0         0
*SECTION_SHELL
1        16  1.000000         3         0         0         0         0
0.001000  0.001000  0.001000  0.001000     0.000     0.000     0.000         0
*MAT_ELASTIC
1 7800.00002.1000E+11  0.300000     0.000     0.000         0
*PART

2         2         2         0         0         0         0         0
*SECTION_SOLID
2         8         0
*MAT_ACOUSTIC
2  1.210000 340.00000     0.000     0.000     0.000     0.000
0.000     0.000     0.000     0.000     0.000     0.000
*DEFINE_CURVE
*SET_NODE_LIST
1     0.000     0.000     0.000     0.000
10000         0         0         0         0         0         0         0
*SET_SEGMENT
*DAMPING_FREQUENCY_RANGE
0.010000 30.000000 300.00000         0
*ELEMENT_SOLID
*NODE
*END

```