FRF for a cantilever with pre-stress condition
This cantilever model shows how to run FRF examples with pre-stress condition. The first file shows the usual *FREQUENCY_DOMAIN_FRF setup without pre-stress. In the second file *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. Example 4.2 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.
https://www.dynaexamples.com/nvh/example-04-02
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FRF for a cantilever with pre-stress condition
This cantilever model shows how to run FRF examples with pre-stress condition. The first file shows the usual *FREQUENCY_DOMAIN_FRF setup without pre-stress. In the second file *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. Example 4.2 from LS-Dyna training class NVH, Fatigue and Frequency Domain Analysis with LS-DYNA by Yun Huang.
*BOUNDARY_SPC_NODE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_NONLINEAR
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*INTERFACE_SPRINGBACK_LSDYNA
*KEYWORD
*LOAD_NODE_POINT
*MAT_ELASTIC
*NODE
*PART
*SECTION_SHELL
*SET_PART_LIST
*TITLE
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_NONLINEAR
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*DEFINE_CURVE
*END
*FREQUENCY_DOMAIN_FRF
*INCLUDE
*KEYWORD
*MAT_ELASTIC
*PART
*SECTION_SHELL
*TITLE
*BOUNDARY_SPC_NODE
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_NONLINEAR
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*FREQUENCY_DOMAIN_FRF
*KEYWORD
*LOAD_NODE_POINT
*MAT_ELASTIC
*NODE
*PART
*SECTION_SHELL
*TITLE
*KEYWORD
*TITLE
cantilevered shell strip w/ end force
*SET_PART_LIST
8 0.000 0.000 0.000 0.000
1 0 0 0 0 0 0 0
*INTERFACE_SPRINGBACK_LSDYNA
8 0 0
*CONTROL_IMPLICIT_GENERAL
1 0.01000 2 0 1 0 0 0
*CONTROL_IMPLICIT_NONLINEAR
2 0 0 0.000 0.000 0.000 0.000 0.000
2 1 0 2
0 0 0.000 1 2
*CONTROL_TERMINATION
1.000000 0 0.000 0.000 0.000
*DATABASE_BINARY_D3PLOT
1.000000 0 0 0 0
0
*BOUNDARY_SPC_NODE
1 0 1 1 1 1 1 1
17 0 1 1 1 1 1 1
33 0 1 1 1 1 1 1
*LOAD_NODE_POINT
16 2 98 -0.50000 0 0 0 0
32 2 98 -1.00000 0 0 0 0
48 2 98 -0.50000 0 0 0 0
*PART
cantilevered shell
1 1 1 0 0 0 0 0
*SECTION_SHELL
1 16 0.83333 3 1 0 0 1
0.100000 0.100000 0.100000 0.100000 0.000 0.000 0.000 0
*MAT_ELASTIC
1 7.0000E-4 3.0000E+7 0.300000 0.000 0.000 0
*DEFINE_CURVE
11 0 0.000 0.000 0.000 0.000 0
0.000 100.0000000
1.0000000 100.0000000
*DEFINE_CURVE
98 0 0.000 0.000 0.000 0.000 0
0.000 0.000
0.0500000 50.0000000
1.0000000 50.0000000
*ELEMENT_SHELL
*NODE
*END
*KEYWORD
*TITLE
cantilevered shell strip w/ end force
*FREQUENCY_DOMAIN_FRF
25 0 -2 3 0 20000.0
0.01
32 0 2 1
100. 10000. 100
*CONTROL_IMPLICIT_EIGENVALUE
100 0.000 0 0.000 0 0.000 2 0.000
0 0 0 0
*INCLUDE
dynain
*CONTROL_IMPLICIT_GENERAL
1 0.00000 2 0 1 0 0 0
*CONTROL_IMPLICIT_NONLINEAR
1 0 0 0.000 0.000 0.000 0.000 0.000
2 1 0 2
0 0 0.000 1 2
*CONTROL_TERMINATION
0.000000 0 0.000 0.000 0.000
*DATABASE_BINARY_D3PLOT
1.000000 0 0 0 0
0
*PART
cantilevered shell
1 1 1 0 0 0 0 0
*SECTION_SHELL
1 16 0.83333 3 1 0 0 1
0.100000 0.100000 0.100000 0.100000 0.000 0.000 0.000 0
*MAT_ELASTIC
1 7.0000E-4 3.0000E+7 0.300000 0.000 0.000 0
*DEFINE_CURVE
11 0 0.000 0.000 0.000 0.000 0
0.000 100.0000000
1.0000000 100.0000000
*DEFINE_CURVE
98 0 0.000 0.000 0.000 0.000 0
0.000 0.000
0.0500000 50.0000000
1.0000000 50.0000000
*END
*KEYWORD
*TITLE
cantilevered shell strip w/ end force
*FREQUENCY_DOMAIN_FRF
25 0 -2 3 0 20000.0
0.01
32 0 2 1
100. 10000. 100
*CONTROL_IMPLICIT_EIGENVALUE
-11 0.000 0 0.000 0 0.000 2 0.000
0 0 0 0
*CONTROL_IMPLICIT_GENERAL
1 0.01000 2 0 1 0 0 0
*CONTROL_IMPLICIT_NONLINEAR
2 0 0 0.000 0.000 0.000 0.000 0.000
2 1 0 2
0 0 0.000 1 2
*CONTROL_TERMINATION
1.000000 0 0.000 0.000 0.000
*DATABASE_BINARY_D3PLOT
1.000000 0 0 0 0
0
*BOUNDARY_SPC_NODE
1 0 1 1 1 1 1 1
17 0 1 1 1 1 1 1
33 0 1 1 1 1 1 1
*LOAD_NODE_POINT
16 2 98 -0.50000 0 0 0 0
32 2 98 -1.00000 0 0 0 0
48 2 98 -0.50000 0 0 0 0
*PART
cantilevered shell
1 1 1 0 0 0 0 0
*SECTION_SHELL
1 16 0.83333 3 1 0 0 1
0.100000 0.100000 0.100000 0.100000 0.000 0.000 0.000 0
*MAT_ELASTIC
1 7.0000E-4 3.0000E+7 0.300000 0.000 0.000 0
*DEFINE_CURVE
11 0 0.000 0.000 0.000 0.000 0
0.000 100.0000000
1.0000000 100.0000000
*DEFINE_CURVE
98 0 0.000 0.000 0.000 0.000 0
0.000 0.000
0.0500000 50.0000000
1.0000000 50.0000000
*ELEMENT_SHELL
*NODE
*END
