*HEADING
: DISTRIBUTING COUPLING WITH LINEAR BEHAVIOR  [DCOUP2D]
PERTURBATION\LOAD CASE
*RESTART,W
*NODE
10,0.0,  0.0
1 ,2.0,  0.5
2 ,2.0, -0.5
3 ,1.0,  1.0
*ELEMENT,TYPE=DCOUP2D,ELSET=CONNECTSET
200,10
*DISTRIBUTING COUPLING,ELSET=CONNECTSET,MASS=10.0
2,2.0
3,3.0
1,1.0
*ELEMENT,TYPE=SPRING1,ELSET=ESPRING1
110,1
120,2
130,3
*ELEMENT,TYPE=SPRING1,ELSET=ESPRING2
210,1
220,2
230,3
*ELEMENT,TYPE=SPRING1,ELSET=ESPRING3
310,1
320,2
330,3
*SPRING,ELSET=ESPRING1
1, 
01.0E2, 
*SPRING,ELSET=ESPRING2
2, 
02.0E2, 
*SPRING,ELSET=ESPRING3
3, 
03.0E2, 
*AMPLITUDE,NAME=SINE,DEFINITION=PERIODIC
1,6.28,0.0,0.0
1.0,0.0
**
**  STEP 1: STATIC APPLIED FORCE
**
*STEP
*STATIC
*CLOAD
10,1,1.0
10,6,2.0
*EL FILE,ELSET=CONNECTSET
NFORC,
*NODE FILE
U,RF
*END STEP
**
**  STEP 2: FREQUENCY EXTRACTION
**
*STEP
*FREQUENCY,EIGENSOLVER=LANCZOS
3, 
*NODE FILE
U,
*OUTPUT,FIELD,VAR=PRESELECT
*OUTPUT,HISTORY
*END STEP
**
**  STEP 3: MODAL DYNAMICS
**
*STEP
*MODAL DYNAMIC
0.01,0.05
*CLOAD,OP=NEW,AMPLITUDE=SINE
10,1,1.
*NODE FILE
U,
V,
A,
*END STEP
**
**  STEP 4: STEADY STATE MODAL DYNAMICS
**
*STEP
*STEADY STATE DYNAMICS
10.0,100.0,2
*CLOAD,OP=NEW
10,1,1.
*NODE FILE
U,
V,
A,
*END STEP

**
**  STEP 5: PERTURBATION
**
*STEP,PERTURBATION
*STATIC
*LOAD CASE,NAME=FORCE-1
*CLOAD,OP=NEW
10,1,1.
*END LOAD CASE
*LOAD CASE,NAME=FORCE-2
*CLOAD,OP=NEW
10,1,2.
*END LOAD CASE
*OUTPUT,FIELD
*NODE OUTPUT
U,
V,
A,
*END STEP