Home » Knowledge Base » NVH / Fatigue » Random vibration with thermal preload I
This is an example of a L-shaped panel subjected to random vibration with thermal preload. The first file shows the usual setup without preload. *INTERFACE_SPRINGBACK_LSDYNA is used to create a dynain-file, which is then the basis for pre-stress analysis with *INCLUDE. In addition, usage of intermittent eigenvalue analysis is shown. In the file domgeom.k the domain decomposition can be studied. Example 6.4 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_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_COORDINATE_SYSTEM
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*FREQUENCY_DOMAIN_RANDOM_VIBRATION
*KEYWORD
*MAT_ELASTIC
*NODE
*PART
*SECTION_SHELL
*SET_NODE_LIST
*SET_SEGMENT
*SET_SHELL_LIST
*TITLE
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*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_COORDINATE_SYSTEM
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*FREQUENCY_DOMAIN_RANDOM_VIBRATION
*KEYWORD
*LOAD_THERMAL_LOAD_CURVE
*MAT_ADD_THERMAL_EXPANSION
*MAT_ELASTIC
*NODE
*PART
*SECTION_SHELL
*SET_NODE_LIST
*SET_SEGMENT
*SET_SHELL_LIST
*TITLE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_NONLINEAR
*CONTROL_SHELL
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*DEFINE_CURVE
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*INTERFACE_SPRINGBACK_DYNA3D
*KEYWORD
*LOAD_THERMAL_LOAD_CURVE
*MAT_ADD_THERMAL_EXPANSION
*MAT_ELASTIC
*NODE
*PART
*SECTION_SHELL
*SET_PART_LIST
*TITLE
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*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_COORDINATE_SYSTEM
*DEFINE_CURVE
*END
*FREQUENCY_DOMAIN_RANDOM_VIBRATION
*INCLUDE
*KEYWORD
*MAT_ELASTIC
*PART
*SECTION_SHELL
*SET_NODE_LIST
*SET_SEGMENT
*SET_SHELL_LIST
*TITLE
*KEYWORD
*TITLE
An L-shaped panel subjected to turbulent boundary layer wave
*FREQUENCY_DOMAIN_RANDOM_VIBRATION
1 10 0.000 10000.000 0
0.010000 0 0 0.000 0.000 0
7 0 0 0.000 0 0 0 0
0 8 8 0.000 0.000 0 0
1 2 0 2001 2002 2003 2004 1
*DATABASE_FREQUENCY_BINARY_D3PSD
1
32.000000 1800.0000 443 0 0 0.000
*DATABASE_FREQUENCY_BINARY_D3RMS
1
*CONTROL_IMPLICIT_EIGENVALUE
10 0.000 0 0.000 0 0.000 0 0.000
0 0 0 0
*CONTROL_IMPLICIT_GENERAL
1 0.000 0 0 1 0 0 0
*CONTROL_IMPLICIT_NONLINEAR
2 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 16 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_COORDINATE_SYSTEM
1 0.000 0.000 0.000 5.000000 0.000 0.000
0.000 5.000000 0.000
*DEFINE_CURVE
*SET_NODE_LIST
1
176 85 341 0 0 0 0 0
*SET_SEGMENT
*SET_SHELL_LIST
2
34 63 0 0 0 0 0 0
*ELEMENT_SHELL
*NODE
*END
*KEYWORD
*TITLE
An L-shaped panel subjected to turbulent boundary layer wave
*FREQUENCY_DOMAIN_RANDOM_VIBRATION
1 10 0.000 10000.000 0
0.010000 0 0 0.000 0.000 0
7 0 0 0.000 0 0 0 0
0 8 8 0.000 0
1 2 0 2001 2002 2003 2004 1
*DATABASE_FREQUENCY_BINARY_D3PSD
1
32.000000 1800.0000 443 0 0 0.000
*DATABASE_FREQUENCY_BINARY_D3RMS
1
*CONTROL_IMPLICIT_GENERAL
1 0.100 0 0 1 0 0 0
*CONTROL_IMPLICIT_EIGENVALUE
-10 0.000 0 0.000 0 0.000 0 0.000
0 0 0 0 1
*MAT_ADD_THERMAL_EXPANSION
1 1 0.000 0 0.000 0 0.000
*LOAD_THERMAL_LOAD_CURVE
2 0
*DEFINE_CURVE
10 0 0.000 0.000 0.000 0.000 0
1.0 10.
*CONTROL_IMPLICIT_NONLINEAR
2 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 16 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
1 0 0.000 0.000 0.000 0.000 0
0.000 9.9999997e-05
300.0000000 9.9999997e-05
*DEFINE_COORDINATE_SYSTEM
1 0.000 0.000 0.000 5.000000 0.000 0.000
0.000 5.000000 0.000
*DEFINE_CURVE
*SET_NODE_LIST
1
176 85 341 0 0 0 0 0
*SET_SEGMENT
*NODE
*END
*KEYWORD
*TITLE
An L-shaped panel subjected to thermal load
*INTERFACE_SPRINGBACK_DYNA3D
8
*SET_PART_LIST
8
1
*CONTROL_IMPLICIT_GENERAL
1 0.100 0 0 1 0 0 0
*CONTROL_IMPLICIT_NONLINEAR
2 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
*LOAD_THERMAL_LOAD_CURVE
2 0
*PART
elastic L-shaped section
1 1 1 0 0 0 0 0
*SECTION_SHELL
1 16 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
*MAT_ADD_THERMAL_EXPANSION
1 1 0.000 0 0.000 0 0.000
*DEFINE_CURVE
1 0 0.000 0.000 0.000 0.000 0
0.000 9.9999997e-05
300.0000000 9.9999997e-05
*DEFINE_CURVE
2 0 0.000 0.000 0.000 0.000 0
0.000 0.000
1.0000000 300.0000000
*ELEMENT_SHELL
*NODE
*END
*KEYWORD
*TITLE
An L-shaped panel subjected to turbulent boundary layer wave
*INCLUDE
dynain
*FREQUENCY_DOMAIN_RANDOM_VIBRATION
1 10 0.000 10000.000 0
0.010000 0 0 0.000 0.000 0
7 0 0 0.000 0 0 0 0
0 8 8 0.000 0.000 0 0
1 2 0 2001 2002 2003 2004 1
*DATABASE_FREQUENCY_BINARY_D3PSD
1
32.000000 1800.0000 443 0 0 0.000
*DATABASE_FREQUENCY_BINARY_D3RMS
1
*CONTROL_IMPLICIT_EIGENVALUE
10 0.000 0 0.000 0 0.000 0 0.000
0 0 0 0 1
*CONTROL_IMPLICIT_GENERAL
1 0.000 0 0 1 0 0 0
*CONTROL_IMPLICIT_NONLINEAR
2 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 16 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_COORDINATE_SYSTEM
1 0.000 0.000 0.000 5.000000 0.000 0.000
0.000 5.000000 0.000
*DEFINE_CURVE
*SET_NODE_LIST
1
176 85 341 0 0 0 0 0
*SET_SEGMENT
*SET_SHELL_LIST
2
34 63 0 0 0 0 0 0
*END
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