*HEADING
 DESIGN SENSITIVITY ANALYSIS FOR TIRE MODEL
 STEP 1: INFLATE TIRE TO 200 KPa
 STEP 2: FOOTPRINT ANALYSIS (DISPLACEMENT CONTROL)
 STEP 3: FOOTPRINT ANALYSIS (LOAD CONTROL)
 STEP 4: FREQUENCY ANALYSIS AROUND FOOTPRINT STATE
 UNITS: KG, M
*PARAMETER
tNominal = 0.
denRub   = 1100.
Ebelt    = 172.2E+09
Ecarc    = 9.87E+9
*DESIGN PARAMETER
tNominal,denRub,Ebelt,Ecarc
*INCLUDE,INP=dsatire_model.inp
*INCLUDE,INP=dsatire_psv.inp
*NODE,NSET=ROAD
*ELSET,ELSET=FOOT,GEN
*SURFACE,TYPE=CYLINDER,NAME=SROAD
 START, -0.3, 0.
 LINE,   0.3, 0.
*RIGID BODY,REF NODE=9999,ANALYTICAL SURFACE=SROAD
*SURFACE,NAME=STREAD
 FOOT, S3
*CONTACT PAIR,INTERACTION=SRIGID
 STREAD, SROAD
*SURFACE INTERACTION,NAME=SRIGID
*FRICTION
 0.0
*ELSET,ELSET=SECT,GENERATE
*ELSET,ELSET=EALL
 TREAD,SIDE,BELT,SOLID
*NSET,NSET=SECT,GENERATE
*NSET,NSET=FOOT,ELSET=FOOT
*NSET,NSET=NOUTP,GENERATE
**************************************************
*STEP,INC=100,NLGEOM=YES,DSA=YES,UNSYMM=YES
 1:  INFLATION
*STATIC, LONG TERM
 0.25, 1.0
*CONTROLS,PARAMETER=FIELD
 1.e-5
*DSA CONTROLS
**averages over increments for similar axisymmetric problem
tNominal, CD, 7.6E-05
denRub,   CD, 1.7E-04
Ebelt,    CD, 7.2E+06
Ecarc,    CD, 4.5E+05
*BOUNDARY
 RIM, 1, 3
*DSLOAD
 INSIDE, P, 200.E3
*OUTPUT,FIELD,FREQ=0
*ELEMENT OUTPUT,ELSET=FOOT
 S
*NODE OUTPUT,NSET=FOOT
 U,RF
*CONTACT OUTPUT
 CSTRESS
*END STEP
**************************************************
*STEP,INC=100,NLGEOM=YES,UNSYMM=YES
 2:  FOOTPRINT (Displacement controlled)
*STATIC, LONG TERM
 0.2, 1.0
*BOUNDARY,OP=NEW
 RIM,  1, 3
 ROAD, 1, 2
 ROAD, 4, 6
 ROAD, 3, , 0.02
*OUTPUT,FIELD,FREQ=1
*ELEMENT OUTPUT,ELSET=FOOT
 S
*NODE OUTPUT,NSET=FOOT
 U,RF
*CONTACT OUTPUT
 CSTRESS
*DESIGN RESPONSE,FREQ=1
*ELEMENT RESPONSE,ELSET=FOOT
 S
*NODE RESPONSE,NSET=FOOT
 U,RF
*CONTACT RESPONSE
 CSTRESS
*END STEP
**************************************************
*STEP,INC=100,NLGEOM=YES,UNSYMM=NO
 3:  FOOTPRINT (Load controlled)
*STATIC, LONG TERM
 1.0, 1.0
*BOUNDARY,OP=NEW
 RIM,  1, 3
 ROAD, 1, 2
 ROAD, 4, 6
*CLOAD,OP=NEW
 ROAD, 3, 3300.
*END STEP
**************************************************
*STEP,DSA=YES
 4:  FREQUENCY
*FREQUENCY,EIGENSOL=LANCZOS
 5,
*DSA CONTROLS
**based on similar axisymmetric problem
tNominal, CD, 1.5E-06
denRub,   CD, 1.7E-04
Ebelt,    CD, 2.6E+05
Ecarc,    CD, 1.5E+05
*OUTPUT,HISTORY
*DESIGN RESPONSE
*END STEP