Home » Knowledge Base » NVH / Fatigue » FEM acoustics of a simple box model with SSD
This is a simple box model to show how to couple FEM acoustics with steady state dynamics (SSD). Example 9.3 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_TERMINATION
*CONTROL_TIMESTEP
*DATABASE_BINARY_D3PLOT
*DATABASE_FREQUENCY_BINARY_D3ACS
*DATABASE_FREQUENCY_BINARY_D3SSD
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*FREQUENCY_DOMAIN_ACOUSTIC_FEM
*FREQUENCY_DOMAIN_SSD
*KEYWORD
*MAT_ACOUSTIC
*MAT_ELASTIC
*NODE
*PART
*SECTION_SHELL
*SECTION_SOLID
*SET_NODE_LIST
*TITLE
*KEYWORD
*TITLE
LS-DYNA keyword deck by LS-Prepost
*FREQUENCY_DOMAIN_SSD
1 100 0.000 0.000 0 0 0
0.010000 0 0 0.000 0.000
0.000 0.000 0 0 0 2 3 0
666 0 3 0 10 200 0 0
*DATABASE_FREQUENCY_BINARY_D3SSD
1
10. 100. 10
*FREQUENCY_DOMAIN_ACOUSTIC_FEM
1.23 340. 10. 100. 10 2.e-5
1
2 3
20 1
*DATABASE_FREQUENCY_BINARY_D3ACS
1
*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_TERMINATION
0.020000 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_BINARY_D3PLOT
0.001000 0 0 0 0
0
*BOUNDARY_SPC_SET
1 0 1 1 1 0 0 0
*SET_NODE_LIST
1 0.000 0.000 0.000 0.000
33 44 55 66 77 88 99 110
121 22 11 67 56 45 34 23
12 1 78 89 100 111 0 0
*PART
boxsolid
1 1 1 0 0 0 0 0
*SECTION_SOLID
1 8 0
*MAT_ACOUSTIC
1 1.220 340.0
*PART
boxsurface
3 3 3 0 0 0 0 0
*SECTION_SHELL
3 16 1.000000 3 0 0 0 0
0.010000 0.010000 0.010000 0.010000 0.000 0.000 0.000 0
*MAT_ELASTIC
3 7800.00002.1000E+11 0.300000 0.000 0.000 0
*DEFINE_CURVE
*SET_NODE_LIST
*ELEMENT_SHELL
*NODE
*END
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