*HEADING
CONN_STD_FREE_BUSHING: free vibration of spring-mass-dashpot
*NODE
706, 6,5,1
10707,7,6,2
*ELEMENT, TYPE=CONN3D2, ELSET=BUSHING
1033, 706, 10707
*CONNECTOR SECTION, ELSET=BUSHING, BEHAVIOR=CB_CAR-ROT
** PROJECTION CARTESIAN, PROJECTION FLEXION-TORSION
BUSHING,
LDIRECTION,LDIRECTION_PERT
*CONNECTOR BEHAVIOR, NAME=CB_CAR-ROT
*CONNECTOR ELASTICITY, COMPONENT=1
48.0,
*CONNECTOR DAMPING, COMPONENT=1
5.0,
*CONNECTOR ELASTICITY, COMPONENT=2
48.0,
*CONNECTOR DAMPING, COMPONENT=2
5.0,
*CONNECTOR ELASTICITY, COMPONENT=3
48.0,
*CONNECTOR DAMPING, COMPONENT=3
5.0,
*CONNECTOR ELASTICITY, COMPONENT=4
480.0,
*CONNECTOR DAMPING, COMPONENT=4
50.0,
*CONNECTOR ELASTICITY, COMPONENT=5
480.0,
*CONNECTOR DAMPING, COMPONENT=5
50.0,
*CONNECTOR ELASTICITY, COMPONENT=6
480.0,
*CONNECTOR DAMPING, COMPONENT=6
50.0,
*ORIENTATION, NAME=LDIRECTION
** orientation used by most connectors
1.,1.,1., 0.,-1.,1.
*ORIENTATION, NAME=LDIRECTION_PERT
1.,1.,1., 0.001,-1.,1.
*ELEMENT, TYPE=MASS, ELSET=MASS
1051,10707
*ELEMENT, TYPE=ROTARYI, ELSET=ROTI
2051, 10707
*MASS, ELSET=MASS
12.0
*ROTARY INERTIA, ELSET=ROTI
120.0, 120.0, 120.0
*BOUNDARY
706,1,6,0
*ELSET, ELSET=QA_TEST
BUSHING
*STEP, PERT
This step should produce the same results as the linear
static step which follows
*STATIC
*CONNECTOR MOTION
BUSHING,1,0.1
BUSHING,2,0.1
BUSHING,3,0.1
BUSHING,4,0.1
BUSHING,5,0.1
BUSHING,6,0.1
*OUTPUT,HISTORY, FREQ=1
*ELEMENT OUTPUT, ELSET=BUSHING
CP,CU,CV
*END STEP
************************************
*STEP, NLGEOM=YES
Every dof should give the same answer.
*STATIC
*CONNECTOR MOTION
BUSHING,1,0.1
BUSHING,2,0.1
BUSHING,3,0.1
BUSHING,4,0.1
BUSHING,5,0.1
BUSHING,6,0.1
*OUTPUT,HISTORY, FREQ=1
*Element output,elset=bushing
CP,CU,CV,CA,CCU,CTF,CVF,CEF,CRF,CUE
*END STEP
************************************
*STEP, NLGEOM=YES, INC=200000
Damped free vibration.
*DYNAMIC, ALPHA=0.0, NOHAF, DIRECT
0.02, 8.0
*CONNECTOR MOTION, OP=NEW
*OUTPUT,FIELD,VAR=PRESELECT
*OUTPUT,HISTORY, FREQ=1
*Element output,elset=bushing
CP,CU,CV,CA,CCU,CTF,CVF,CEF,CRF,CUE,CUP,CUPEQ
*Restart,write,frequency=1
*END STEP