*HEADING
 TIRE AIR COUPLED ACOUSTIC MODEL WITH TRANSPORT EFFECTS
 3D FULL TIRE MODEL 
 STEP 1: TRANSFER TIRE FOOTPRINT RESULTS
         FROM sst_acoustic_refl
 STEP 2: FREE ROLLING ANALYSIS, 60 KM/HR
 STEP 3: EXTRACT REAL EIGENVALUES FOR ROLLING SYSTEM
 STEP 4: COMPLEX EIGENVALUES FOR ROLLING SYSTEM 
 STEP 5: FREQUENCY RESPONSE WITH MOVING SOLID & AIR
 UNITS: KG, M
*RESTART,READ,STEP=1
******************************************
*STEP,INC=300,NLGEOM=YES,UNSYMM=YES
 2:  Free rolling at 60km
*STEADY STATE TRANSPORT, LONG TERM,INERTIA=YES
 0.5, 1.0
*CHANGE FRICTION,INTERACTION=SRIGID
*FRICTION,SLIP=0.02
 1.0
*TRANSPORT VELOCITY
 NTIRE, 53.97
*MOTION,TYPE=VELOCITY,TRANSLATION
 NTIRE, 1, , 16.666666
*NODE PRINT,NSET=TIRE-RIM,FREQ=100
 RF,
*EL PRINT,FREQ=0
*OUTPUT,FIELD,OP=NEW,FREQ=100
**ELEMENT OUTPUT
** S,LE
**ELEMENT OUTPUT,REBAR
** S,LE
*NODE OUTPUT
 U,V
**CONTACT OUTPUT
**CSTRESS,CDISP
*END STEP
*******************************************
*******************************************
*******************************************
*******************************
*STEP,NLGEOM
 3: EXTRACT REAL EIGENVALUES FOR THE ROLLING SYSTEM
*FREQUENCY,EIGENSOLVER=LANCZOS
 12, 200.0,260.0
**92, 20.0, 260.0   ---> To reproduce the figures in the manual
*ACOUSTIC FLOW VELOCITY, ROTATION
 AIR,   53.97
*OUTPUT,FIELD,FREQ=1
*NODE OUTPUT
 U,  
*NODE OUTPUT,NSET=AIR
 POR,
*END STEP
*******************************
*STEP,NLGEOM
 4: COMPLEX EIGENVALUES FOR THE ROLLING SYSTEM
*COMPLEX FREQUENCY
,
*ACOUSTIC FLOW VELOCITY, ROTATION
 AIR,   53.97
*ENDSTEP
*******************************
*STEP,NLGEOM
 5: FREQUENCY RESPONSE FOR THE ROLLING SYSTEM
*STEADYSTATEDYNAMICS,DIRECT,FREQUENCY SCALE=LINEAR, INTERVAL=RANGE
 225.0, 235.0, 10
** 200.0, 260.0, 121  ---> To reproduce the figures in the manual
*ACOUSTIC FLOW VELOCITY, ROTATION
 AIR,   53.97
*BOUNDARY
TIRE-RIM,1,6
ROAD,1,2
ROAD,4,6
**
*Boundary
 ROAD,3,3,0.001
**
*OUTPUT,HISTORY,FREQ=1
*NODE OUTPUT,NSET=AIRCROWN
POR,
*NODE OUTPUT,NSET=AIRSIDE
POR,
*NODE OUTPUT,NSET=ROAD
U,RF
*END STEP
*******************************