BEM acoustics of a beam subjected to SSD

A rectangular beam is subjected to frequency domain acceleration. BEM acoustic analysis is coupled with SSD excitation via *FREQUENCY_DOMAIN_SSD. *FREQUENCY_DOMAIN_ACOUSTIC_BEM uses variational indirect BEM and raised cosine windowing technique for FFT. In the file domgeom.k the domain decomposition can be studied. Example 8.4 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.

*BOUNDARY_SPC_SET
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_SOLUTION
*DATABASE_FREQUENCY_BINARY_D3SSD
*DATABASE_HISTORY_NODE_SET
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*FREQUENCY_DOMAIN_ACOUSTIC_BEM
*FREQUENCY_DOMAIN_SSD
*KEYWORD  
*MAT_ELASTIC
*NODE
*PART
*SECTION_SHELL
*SET_NODE_LIST
*SET_SEGMENT
*TITLE

*KEYWORD  
*TITLE
A rectangular plate subjected to nodal acceleration excitation                  
*FREQUENCY_DOMAIN_SSD
         1        20     0.000     0.000         0         0
  0.020000         0         0     0.000     0.000
                                                           1         2         0
         0         0         3         3       100       200         0         0
*DATABASE_FREQUENCY_BINARY_D3SSD
         1
  1.000000 500.00000       500         0         0
*FREQUENCY_DOMAIN_ACOUSTIC_BEM
  1.210000 340.00000  1.000000 500.00000       500  0.001000     0.000 2.0000E-5
         3         1         0         0         4         0         0         0
         2      1000 1.0000E-6         8     0.000     0.000         0         0
                   1                   1
         1         2         0         0
*CONTROL_IMPLICIT_EIGENVALUE
        20     0.000         0     0.000         0     0.000         0     0.000
         0         0         0         0
*CONTROL_IMPLICIT_GENERAL
         1     0.000         0         0         0         0         0         0
*CONTROL_IMPLICIT_SOLUTION
         1         0         0     0.000     0.000     0.000     0.000     0.000
         2         1         1         0         2         0
         0         0     0.000         1         2
*DATABASE_HISTORY_NODE_SET
         2         0         0         0         0         0         0         0
*BOUNDARY_SPC_SET
         1         0         1         1         1         1         1         1
*SET_NODE_LIST
         1     0.000     0.000     0.000     0.000          
         1         2         3         4         5         6         7         8
         9        10        11         0         0         0         0         0
*PART
shells                                                                          
         1         1         1         0         0         0         0         0
*SECTION_SHELL
         1        18  0.833333         3         0         0         0         0
  0.005000  0.005000  0.005000  0.005000     0.000     0.000     0.000         0
*MAT_ELASTIC
         1 7830.00002.0700E+11  0.300000     0.000     0.000         0
*DEFINE_CURVE
       100         0     0.000     0.000     0.000     0.000         0
           1.0000000         100.0000000
         500.0000000         100.0000000
*DEFINE_CURVE
       200         0     0.000     0.000     0.000     0.000         0
           1.0000000               0.000
         500.0000000               0.000
*SET_NODE_LIST
         2     0.000     0.000     0.000     0.000          
         6       556         0         0         0         0         0         0
*SET_NODE_LIST
         3     0.000     0.000     0.000     0.000          
      1001         0         0         0         0         0         0         0
*SET_SEGMENT
*ELEMENT_SHELL
*NODE
*END