Home » Knowledge Base » NVH / Fatigue » Correlated multiple nodal forces
This is an example of a L-shaped panel subjected to multiple nodal force power spectral density excitation. *DATABASE_FREQUENCY_BINARY_D3PSD and *DATABASE_FREQUENCY_BINARY_D3RMS are used for post-processing of the results. The effect of correlated and uncorrelated excitations can be compared. Example 6.8 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.
Keywords
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_LINEAR
*CONTROL_IMPLICIT_NONLINEAR
*CONTROL_SHELL
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*DATABASE_FREQUENCY_BINARY_D3PSD
*DATABASE_FREQUENCY_BINARY_D3RMS
*DATABASE_HISTORY_NODE_SET
*DATABASE_HISTORY_SHELL_SET
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*FREQUENCY_DOMAIN_RANDOM_VIBRATION
*KEYWORD
*MAT_ELASTIC
*NODE
*PART
*SECTION_SHELL
*SET_NODE_LIST
*SET_SHELL_LIST
*TITLE
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_LINEAR
*CONTROL_IMPLICIT_NONLINEAR
*CONTROL_SHELL
*CONTROL_STRUCTURED
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*DATABASE_FREQUENCY_BINARY_D3PSD
*DATABASE_FREQUENCY_BINARY_D3RMS
*DATABASE_HISTORY_NODE_SET
*DATABASE_HISTORY_SHELL_SET
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*FREQUENCY_DOMAIN_RANDOM_VIBRATION
*KEYWORD
*MAT_ELASTIC
*NODE
*PART
*SECTION_SHELL
*SET_NODE_LIST
*SET_SHELL_LIST
*TITLE
*KEYWORD
*TITLE
An L-shaped panel subjected to concentrated nodal force excitation
*FREQUENCY_DOMAIN_RANDOM_VIBRATION
1 5 0.000 0.000 0 0
0.030000 0 0 0.000 0.000 0
8 1 0 0.000 0 0 1 0
0 0 0 0.000 0.000 0
3 1 3 2001
*SET_NODE_LIST
3 0.000 0.000 0.000 0.000
176 341 154 280
*DATABASE_FREQUENCY_BINARY_D3PSD
1
50.000000 1000.0000 20 0 0
*DATABASE_FREQUENCY_BINARY_D3RMS
1
*CONTROL_IMPLICIT_EIGENVALUE
5 0.000 0 0.000 0 0.000 0 0.000
0 0 0 0 1
*CONTROL_IMPLICIT_GENERAL
1 1.000000 0 0 0 0 0 0
*CONTROL_IMPLICIT_LINEAR
0 0 1 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
*CONTROL_TERMINATION
1.000000 0 0.000 0.000 0.000
*DATABASE_BINARY_D3PLOT
0.000 0 0 0 0
0
*DATABASE_HISTORY_NODE_SET
1 0 0 0 0 0 0 0
*DATABASE_HISTORY_SHELL_SET
2 0 0 0 0 0 0 0
*PART
elastic L-shaped section
1 1 1 0 0 0 0 0
*SECTION_SHELL
1 18 0.833000 3 3 0 0 0
0.100000 0.100000 0.100000 0.100000 0.000 0.000 0.000 0
*MAT_ELASTIC
1 1.0000E-4 1.0600E+7 0.330000 0.000 0.000 0
*DEFINE_CURVE
2001 0 0.000 0.000 0.000 0.000 0
50.0000000 0.1000000
63.0000000 1.0000000
80.0000000 1.0000000
100.0000000 1.0000000
125.0000000 1.0000000
160.0000000 1.0000000
200.0000000 1.0000000
250.0000000 1.0000000
315.0000000 1.0000000
400.0000000 1.0000000
500.0000000 1.0000000
630.0000000 1.0000000
800.0000000 1.0000000
1000.0000000 0.1000000
*SET_NODE_LIST
1 0.000 0.000 0.000 0.000
176 85 241 0 0 0 0 0
*SET_SHELL_LIST
2 0.000 0.000 0.000 0.000
34 63 0 0 0 0 0 0
*ELEMENT_SHELL
*NODE
*END
*KEYWORD
*TITLE
An L-shaped panel subjected to concentrated nodal force excitation
*FREQUENCY_DOMAIN_RANDOM_VIBRATION
1 5 0.000 0.000 0 0
0.030000 0 0 0.000 0.000 0
8 1 0 0.000 0 0 4 6
0 0 0 0.000 0.000 0
3 1 3 2001
4 1 3 2001
5 1 3 2001
6 1 3 2001
1 2 2001
1 3 2001
1 4 2001
2 3 2001
2 4 2001
3 4 2001
*SET_NODE_LIST
3 0.000 0.000 0.000 0.000
176
*SET_NODE_LIST
4 0.000 0.000 0.000 0.000
341
*SET_NODE_LIST
5 0.000 0.000 0.000 0.000
154
*SET_NODE_LIST
6 0.000 0.000 0.000 0.000
280
*DATABASE_FREQUENCY_BINARY_D3PSD
1
50.000000 1000.0000 20 0 0
*DATABASE_FREQUENCY_BINARY_D3RMS
1
*CONTROL_IMPLICIT_EIGENVALUE
5 0.000 0 0.000 0 0.000 0 0.000
0 0 0 0 1
*CONTROL_IMPLICIT_GENERAL
1 1.000000 0 0 0 0 0 0
*CONTROL_IMPLICIT_LINEAR
0 0 1 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
*CONTROL_STRUCTURED
*CONTROL_TERMINATION
1.000000 0 0.000 0.000 0.000
*DATABASE_BINARY_D3PLOT
0.000 0 0 0 0
0
*DATABASE_HISTORY_NODE_SET
1 0 0 0 0 0 0 0
*DATABASE_HISTORY_SHELL_SET
2 0 0 0 0 0 0 0
*PART
elastic L-shaped section
1 1 1 0 0 0 0 0
*SECTION_SHELL
1 18 0.833000 3 3 0 0 0
0.100000 0.100000 0.100000 0.100000 0.000 0.000 0.000 0
*MAT_ELASTIC
1 1.0000E-4 1.0600E+7 0.330000 0.000 0.000 0
*DEFINE_CURVE
2001 0 0.000 0.000 0.000 0.000 0
50.0000000 0.1000000
63.0000000 1.0000000
80.0000000 1.0000000
100.0000000 1.0000000
125.0000000 1.0000000
160.0000000 1.0000000
200.0000000 1.0000000
250.0000000 1.0000000
315.0000000 1.0000000
400.0000000 1.0000000
500.0000000 1.0000000
630.0000000 1.0000000
800.0000000 1.0000000
1000.0000000 0.1000000
*SET_NODE_LIST
1 0.000 0.000 0.000 0.000
176 85 241 0 0 0 0 0
*SET_SHELL_LIST
2 0.000 0.000 0.000 0.000
34 63 0 0 0 0 0 0
*ELEMENT_SHELL
*NODE
*END
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