*HEADING
 TIRE SUBSTRUCTURE: SUBSTRUCTTIRE_GENERATE
 RESTART TO IDENTIFY NODES IN FOOTPRINT
 STEP 5: REMOVE CONTACT CONSTRAINTS
 STEP 6: EXTRACT FIXED INTERFACE MODES
 STEP 7: GENERATE SUPERELEMENT
 UNITS: KG, M
*RESTART,READ,STEP=1,WRITE,OVERLAY
**
**************************************************
*NSET,NSET=FOOTPR,UNSORTED
**
** THIS IS THE LIST OF TIRE NODES FOUND TO BE IN CONTACT WITH THE
** ROAD AT THE END OF THE PREVIOUS STEP.
**************************************************
*STEP,INC=1,NLGEOM
 2: REMOVE CONTACT CONSTRAINTS
*STATIC
1.,1.
*BOUNDARY,FIXED,OP=NEW
 RIM,1,6
 FOOTPR,1,3
 ROAD,1,6
*MODEL CHANGE, TYPE=CONTACT PAIR, REMOVE
 STREAD, SROAD
*NODE FILE,NSET=FOOTPR
COORD,
*END STEP
**
**************************************************
*STEP
 3: EXTRACT FIXED INTERFACE MODES
*FREQUENCY, EIGENSOLVER=LANCZOS, SIM=NO
20,,,,,15
**
*BOUNDARY,OP=NEW
 ROAD, 1, 6
 RIM,1,6
 FOOTPR,1,3
**
*END STEP
**
**************************************************
*STEP
 4: GENERATE SUPERELEMENT
*SUBSTRUCTURE GENERATE, TYPE=Z101, OVERWRITE,
 RECOVERY MATRIX=YES, MASS MATRIX=YES
**
*BOUNDARY,OP=NEW
 ROAD, 1, 6
*RETAINED NODAL DOFS, SORTED=NO
RIM,1,6
FOOTPR,1,3
*SELECT EIGENMODES, GENERATE
*SUBSTRUCTURE MATRIX OUTPUT, STIFFNESS=YES, MASS=YES,
 SLOAD=YES, RECOVERY MATRIX=YES
*END STEP