*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.
    3545,    3550,    3555,    4045,    4050,    4055,    4540,    4545,
    4550,    4555,    5040,    5045,    5050,    5055,    5540,    5545,
    5550,    5555,    6040,    6045,    6050,    6055,    6540,    6545,
    6550,    6555,    7040,    7045,    7050,    7055,    7540,    7545,
    7550,    7555,    8045,    8050,    8055,    8550,    8555,  103545,
  103550,  104045,  104050,  104540,  104545,  104550,  105040,  105045,
  105050,  105540,  105545,  105550,  106040,  106045,  106050,  106540,
  106545,  106550,  107040,  107045,  107050,  107540,  107545,  107550,
  108045,  108050,  108550  
**************************************************
*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
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
1,20,1
*SUBSTRUCTURE MATRIX OUTPUT, STIFFNESS=YES, MASS=YES,
 SLOAD=YES, RECOVERY MATRIX=YES
*END STEP