** restart from tire_substracous_refl.res
*RESTART,READ,STEP=2
*STEP,NLGEOM
 3: EXTRACT EIGENVALUES
*FREQUENCY,EIGENSOLVER=LANCZOS, NORMALIZATION=MASS, PROPERTY=230.
 ,, 400.0
*BOUNDARY,op=new
TIRE-RIM,1,6
ROAD,1,2
ROAD,4,6
*OUTPUT,FIELD,FREQ=1
*NODE OUTPUT
 U,  
*NODE OUTPUT,NSET=AIR
 POR,
*END STEP
**------------------------------------------------
*STEP
 4: GENERATE SUPERELEMENT
*SUBSTRUCTURE GENERATE, TYPE=Z101, OVERWRITE, MASS MATRIX=YES, STRUCTURAL DAMPING MATRIX=YES, PROPERTY=230.
*BOUNDARY,OP=NEW
*RETAINED NODAL DOFS, SORTED=NO
TIRE-RIM,1,6
ROAD,1,6
SIDE1, 1,6
*SELECT EIGENMODES, DEFINITIO=FREQUENCY
0.0, 600.,
*SUBSTRUCTURE MATRIX OUTPUT, STIFFNESS=YES, MASS=YES,
 SLOAD=YES, RECOVERY MATRIX=NO,file=substracous_gen
*END STEP