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A body has constant angular velocity. The radial vibration introduced due to the rapid deployment of the rotation is damped out in the initialization phase using dynamic relaxation.
Introduction
*LOAD_BODY_GENERALIZED
Rotating Elements
LS-DYNA Manual Section: *LOAD_BODY_GENERALIZED
Additional Sections:
*BOUNDARY_PRESCRIBED_MOTION_NODE
*DATABASE_CROSS_SECTION_SET
*INITIAL_VELOCITY_NODE
Example: Rotating Elements
Filename: load_body.shell.k
Description:
A body has constant angular velocity. The radial vibration introduced due to
the rapid deployment of the rotation is damped out in the initialization phase
using dynamic relaxation.
Model:
The body measures 200 * 100 * 10 mm 3. The body consists of 2 Belytschko-Tsay
elastic shell elements. The body rotates about the y-axis at 62.83 radians per
second. The analysis ends at 0.1 seconds.
Input:
All nodes have an initial translational velocity based on the angular velocity
v=omega x r. (*INITIAL_VELOCITY_NODE). Dynamic relaxation damps oscillations
in the radial direction during the initialization (*LOAD_BODY_GENERALIZED,
*DEFINE_CURVE). This essentially pre-stresses the structure and the load
continues into the analysis portion. Because of the condition of constant
angular velocity of the two nodes on the axis of rotation, the motion remains
uniform throughout the calculation (*BOUNDARY_PRESCRIBED_MOTION_NODE).
The section forces are available in the ASCII database file secforc
(*DATABASE_SECFORC).
Reference:
Schweizerhof, K. and Weimar, K.
Keywords
*BOUNDARY_PRESCRIBED_MOTION_NODE
*CONTROL_HOURGLASS
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*DATABASE_BINARY_D3THDT
*DATABASE_CROSS_SECTION_SET
*DATABASE_ELOUT
*DATABASE_GLSTAT
*DATABASE_HISTORY_NODE
*DATABASE_HISTORY_SHELL
*DATABASE_NODOUT
*DATABASE_SECFORC
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*INITIAL_VELOCITY_NODE
*KEYWORD
*LOAD_BODY_GENERALIZED
*MAT_ELASTIC
*NODE
*PART
*SECTION_SHELL
*SET_NODE_LIST
*SET_SHELL_LIST
*TITLE
*KEYWORD
*TITLE
Mass with Angular Rotation - 2 Shell Elements
$
$ LSTC Example
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$ Last Modified: September 18, 1997
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$ Units: ton, mm, s, N, MPa, N-mm
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$$$$ Control Ouput
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*CONTROL_TERMINATION
$ endtim endcyc dtmin endneg endmas
0.1
$
*CONTROL_HOURGLASS
$ ihq qh
4
$
$
*DATABASE_BINARY_D3PLOT
$ dt/cycl lcdt
10.00E-03
$
*DATABASE_BINARY_D3THDT
$ dt/cycl lcdt
0.50E-03
$
*DATABASE_ELOUT
$ dt
0.001
$
*DATABASE_HISTORY_SHELL
$ id1 id2 id3 id4 id5 id6 id7 id8
1 2
$
*DATABASE_GLSTAT
$ dt
0.001
$
*DATABASE_NODOUT
$ dt
0.001
$
*DATABASE_HISTORY_NODE
$ id1 id2 id3 id4 id5 id6 id7 id8
1 2 3 4 5 6
$
*DATABASE_SECFORC
$ dt/cycl lcdt
0.001
$
*DATABASE_CROSS_SECTION_SET
$ nsid hsid bsid ssid tsid dsid
1 1
$
*SET_NODE_LIST
$ sid da1 da2 da3 da4
1
$ nid1 nid2 nid3 nid4 nid5 nid6 nid7 nid8
1 2
$
*SET_SHELL_LIST
$ sid da1 da2 da3 da4
1
$ eid1 eid2 eid3 eid4 eid5 eid6 eid7 eid8
1
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Initial Velocity
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*INITIAL_VELOCITY_NODE
$ nid vx vy vz vxe vye vze
1 0.0 0.0 0.0 0.00 62.83 0.00
2 0.0 0.0 0.0 0.00 62.83 0.00
3 0.0 0.0 -6283.0 0.00 62.83 0.00
4 0.0 0.0 -6283.0 0.00 62.83 0.00
5 0.0 0.0 -12566.0 0.00 62.83 0.00
6 0.0 0.0 -12566.0 0.00 62.83 0.00
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Boundary Conditions
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*BOUNDARY_PRESCRIBED_MOTION_NODE
$ nid dof vad lcid sf vid
1 6 0 1 1.0
2 6 0 1 1.0
$
*DEFINE_CURVE
$ lcid sidr scla sclo offa offo
1
$ abscissa ordinate
0.000 62.83
1.000 62.83
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$
$$$$ Loading
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*LOAD_BODY_GENERALIZED
$ n1 n2 lcid drlcid xc yc zc
1 6 0 2 0.0 0.0 0.0
$ ax ay az omx omy omz
0.0 0.0 0.0 0.0 1.0 0.0
$
*DEFINE_CURVE
$ lcid sidr scla sclo offa offo
2 1
$ abscissa ordinate
0.000 62.83
1.000 62.83
$
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$$$$ Define Parts and Materials
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
$
*PART
$ pid sid mid eosid hgid adpopt
shells
1 1 1
$
$
*MAT_ELASTIC
$ mid ro e pr da db k
1 1.00e-08 210000. 0.300
$
$
*SECTION_SHELL
$ sid elform shrf nip propt qr/irid icomp
1 3
$ t1 t2 t3 t4 nloc
10.0 10.0 10.0 10.0
$
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Define Nodes and Elements
$
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$
$
*END
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