Home » Knowledge Base » NVH / Fatigue » BEM acoustics of a tunnel model
A simplified tunnel model is subjected to a user defined velocity excitation. *FREQUENCY_DOMAIN_ACOUSTIC_BEM_PANEL_CONTRIBUTION is used for running acoustic panel contribution analysis with variational indirect BEM. Example 8.6 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.
Keywords
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*FREQUENCY_DOMAIN_ACOUSTIC_BEM_PANEL_CONTRIBUTION
*KEYWORD
*MAT_RIGID
*NODE
*PART
*SECTION_SHELL
*SET_NODE_LIST
*SET_SEGMENT
*TITLE
*KEYWORD
*TITLE
A tunnel model
*FREQUENCY_DOMAIN_ACOUSTIC_BEM_PANEL_CONTRIBUTION
1.210000 343.00000 150.00000 300.00000 201 0.005000 0.000 2.0000E-5
1 1 0 0 0 0 0 0
2 2000 1.0000E-6 8 0.000 0.000 0 0
4
1 2 0 3 3
2 2 0 3 3
3 2 0 3 3
4 2 0 3 3
1
*PART
tunnel
1 1 1 0 0 0 0 0
*SECTION_SHELL
1 0 0.000 0 0 0 0 0
0.001000 0.001000 0.001000 0.001000 0.000 0.000 0.000 0
*MAT_RIGID
1 0.100000 0.300000 0.000 0.000 0.000 0.000
1.000000 7 7
0.000 0.000 0.000 0.000 0.000 0.000
*DEFINE_CURVE
3 0 0.000 0.010000 0.000 0.000 0
1.0000000 1.0000000
10000.000000 1.0000000
*SET_NODE_LIST
1 0.000 0.000 0.000 0.000
5401 0 0 0 0 0 0 0
*SET_SEGMENT
*ELEMENT_SHELL
*NODE
*END
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