A cantilever beam is subjected to a load at the free end. The beam then vibrates relative to the equilibrium position without damping in case 1 and with damping in case 2.
*CONTROL_DAMPING Cantilever Beam LS-DYNA Manual Section: *CONTROL_DAMPING Additional Sections: *DAMPING_GLOBAL *DATABASE_CROSS_SECTION_SET *LOAD_NODE_SET Example: Cantilever Beam Filename: control_damping.beam.k Description: A cantilever beam is subjected to a load at the free end. The beam then vibrates relative to the equilibrium position without damping in case 1 and with damping in case 2. Model: The beam me asures 1000 * 100 * 10 mm3 and is modeled by 10 Belytschko-Tsay shell elements. A force of 100 N is applied in the z -direction at the free end. The calculation ends at 0.5 seconds. Input for the undamped system: The force at the free end is applied as two point forces. The size of these forces is controlled by load curve d efinition number 1 (*DEF INE_CURVE, * LOAD_NODE_SET). The ASCII-files contain information for section forc data, nodal information, and shell element information. Data from ASCII-files can be processed in phase 3 of LS-TAURUS. Input for the damped system: The same input as in the undamped cas e except for a global damping constant (*DAMPING_GLOBAL, *CONTROL_DAMPING). Reference: Schweizerhof, K. and Weimar, K.
$*DAMPING_GLOBAL *CONTROL_CONTACT *CONTROL_DYNAMIC_RELAXATION *CONTROL_ENERGY *CONTROL_HOURGLASS *CONTROL_OUTPUT *CONTROL_TERMINATION *DAMPING_GLOBAL *DATABASE_BINARY_D3PLOT *DATABASE_BINARY_D3THDT *DATABASE_CROSS_SECTION_SET *DATABASE_ELOUT *DATABASE_EXTENT_BINARY *DATABASE_GLSTAT *DATABASE_HISTORY_NODE *DATABASE_HISTORY_SHELL *DATABASE_NODOUT *DATABASE_SECFORC *DEFINE_CURVE *ELEMENT_SHELL *END *KEYWORD *LOAD_NODE_SET *MAT_ELASTIC *NODE *PART *SECTION_SHELL *SET_NODE_LIST *SET_SHELL_LIST *TITLE
*KEYWORD
*TITLE
Cantilever Beam with Damping
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$ LSTC Example
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$ Last Modified: September 11, 1997
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$ Units: ton, mm, s, N, MPa, N-mm
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Damping
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*DAMPING_GLOBAL
$ lcid valdmp
0 0.0
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$$$$ for damping of 10
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$*DAMPING_GLOBAL
$ 0 10.0
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$$$$ for damping of 50
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$*DAMPING_GLOBAL
$ 0 50.0
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*CONTROL_DYNAMIC_RELAXATION
$ nrcyck drtol drfctr drterm tssfdr irelal edttl idrflg
100 1.0e-3 0.995 0.9
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Control Ouput
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*CONTROL_TERMINATION
$ endtim endcyc dtmin endneg endmas
0.5001
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*CONTROL_CONTACT
$ slsfac rwpnal islchk shlthk penopt thkchg orien
0.1
$ usrstr usrfac nsbcs interm xpenen
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*CONTROL_ENERGY
$ hgen rwen slnten rylen
2 2
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*CONTROL_HOURGLASS
$ ihq qh
4
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*CONTROL_OUTPUT
$ npopt neecho nrefup iaccop opifs ipnint ikedit
0 0 0 0 2 1000
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*DATABASE_EXTENT_BINARY
$ neiph neips maxint strflg sigflg epsflg rltflg engflg
1
$ cmpflg ieverp beamip
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*DATABASE_BINARY_D3PLOT
$ dt lcdt
0.020
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*DATABASE_BINARY_D3THDT
$ dt lcdt
999999
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*DATABASE_ELOUT
$ dt
0.001
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*DATABASE_HISTORY_SHELL
$ id1 id2 id3 id4 id5 id6 id7 id8
1
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*DATABASE_GLSTAT
$ dt
0.001
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*DATABASE_NODOUT
$ dt
0.001
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*DATABASE_HISTORY_NODE
$ id1 id2 id3 id4 id5 id6 id7 id8
21
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*DATABASE_SECFORC
$ dt
0.001
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Cross Sections
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$$ define a cross section through the beam to monitor force & moment
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*DATABASE_CROSS_SECTION_SET
$ nsid hsid bsid ssid tsid dsid
1 1
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*SET_NODE_LIST
$ sid da1 da2 da3 da4
1
$ nid1 nid2 nid3 nid4 nid5 nid6 nid7 nid8
1 2
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*SET_SHELL_LIST
$ sid da1 da2 da3 da4
1
$ eid1
1
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Loading
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Load nodes 21 and 22 with a constant 50 N in the z-direction.
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*LOAD_NODE_SET
$ nsid dof lcid sf cid m1 m2 m3
2 3 1 0.5
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*SET_NODE_LIST
$ sid da1 da2 da3 da4
2
$ nid1 nid2 nid3 nid4 nid5 nid6 nid7 nid8
21 22
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*DEFINE_CURVE
$ lcid sidr scla sclo offa offo
1
$ a o
0.0 100.0
10.0 100.0
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Define Parts and Materials
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
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*PART
$ pid sid mid eosid hgid adpopt
Beam - Elastic Material
1 1 1
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*MAT_ELASTIC
$ mid ro e pr da db k
1 1.00e-08 210000.0 0.300
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*SECTION_SHELL
$ sid elform shrf nip propt qr/irid icomp
1 2 1.0 2 1.0
$ t1 t2 t3 t4 nloc
10.0 10.0 10.0 10.0 0.0
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Define Nodes and Elements
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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
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$$$$ Nodes 1 and 2 have fixed boundary conditions (translation and rotation).
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*END
