*HEADING
 TIRE AIR COUPLED ACOUSTIC MODEL WITH TRANSPORT EFFECTS
 3D FULL TIRE MODEL
 STEP 1: TRANSFER TIRE INFLATION FOOTPRINT RESULTS
         FROM sst_acoustic_refl
 STEP 2: FREE ROLLING ANALYSIS, 10 KM/HR
 STEP 3: FREE ROLLING ANALYSIS, 30 KM/HR
 STEP 4: FREE ROLLING ANALYSIS, 50 KM/HR
 STEP 5: FREE ROLLING ANALYSIS,100 KM/HR
 STEP 6: EXTRACT REAL EIGENVALUES FOR ROLLING SYSTEM
 STEP 7: COMPLEX EIGENVALUES FOR ROLLING SYSTEM
 STEP 8: FREQUENCY RESPONSE WITH MOVING SOLID & AIR
 STEP 9: FREQUENCY RESPONSE WITH MOVING SOLID ONLY
 STEP10: EXTRACT REAL EIGENVALUES WITH SOLID MOTION ONLY
 STEP11: COMPLEX EIGENVALUES WITH SOLID MOTION ONLY
 UNITS: KG, M
*RESTART,READ,STEP=1
******************************************
*STEP,INC=300,NLGEOM=YES,UNSYMM=YES
 2:  10km
*STEADY STATE TRANSPORT, LONG TERM,INERTIA=YES
*CHANGE FRICTION,INTERACTION=SRIGID
*FRICTION,SLIP=0.02
 1.0
*TRANSPORT VELOCITY
 NTIRE, 8.9446
*ACOUSTIC FLOW VELOCITY, ROTATION
 AIR,   8.9446
*MOTION,TYPE=VELOCITY,TRANSLATION
 NTIRE, 1, , 2.7778
*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,INC=300,NLGEOM=YES,UNSYMM=YES
 3:  30km/h
*STEADY STATE TRANSPORT, LONG TERM,INERTIA=YES
*RESTART,WRITE,OVERLAY
**
**
*TRANSPORT VELOCITY
 NTIRE, 26.8339
*ACOUSTIC FLOW VELOCITY, ROTATION
 AIR,   26.8339
*MOTION,TYPE=VELOCITY,TRANSLATION
 NTIRE, 1, , 8.3334
*NODE PRINT,NSET=TIRE-RIM,FREQ=100
 RF,
*END STEP
*******************************************
*STEP,INC=300,NLGEOM=YES,UNSYMM=YES
 4:  50km/h
*STEADY STATE TRANSPORT, LONG TERM,INERTIA=YES
*RESTART,WRITE,OVERLAY
**
**
*TRANSPORT VELOCITY
 NTIRE, 44.7232
*ACOUSTIC FLOW VELOCITY, ROTATION
 AIR,   44.7232
*MOTION,TYPE=VELOCITY,TRANSLATION
 NTIRE, 1, , 13.889
*NODE PRINT,NSET=TIRE-RIM,FREQ=100
 RF,
*END STEP
*******************************************
*STEP,INC=300,NLGEOM=YES,UNSYMM=YES
 5:  100km/h
*STEADY STATE TRANSPORT, LONG TERM,INERTIA=YES
*RESTART,WRITE,OVERLAY
**
**
*TRANSPORT VELOCITY
 NTIRE, 88.4464
*ACOUSTIC FLOW VELOCITY, ROTATION
 AIR,   88.4464
*MOTION,TYPE=VELOCITY,TRANSLATION
 NTIRE, 1, , 27.778
*END STEP
*******************************
*STEP,NLGEOM
 6: EXTRACT REAL EIGENVALUES FOR ROLLING SYSTEM
*FREQUENCY,EIGENSOLVER=LANCZOS
 12, 200.0,260.0
** 92, 20.0, 260.0 -> to produce manual figures
*BOUNDARY,FIXED
ROAD,1,6,0.0
*OUTPUT,FIELD,FREQ=1
*NODE OUTPUT
 U,
*NODE OUTPUT,NSET=AIR
 POR,
*END STEP
*******************************
*STEP,NLGEOM
 7: COMPLEX EIGENVALUES FOR ROLLING SYSTEM
*COMPLEX FREQUENCY,FRICTION DAMPING=YES
*ENDSTEP
*******************************
*STEP,NLGEOM
 8: FREQUENCY RESPONSE WITH MOVING SOLID & AIR
*STEADYSTATEDYNAMICS,DIRECT,INTERVAL=EIGENFREQ
** 200.0, 260.0, 7 -> to produce manual figures
*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=AIRFOOT
POR,
*NODE OUTPUT,NSET=AIRSIDE
POR,
*NODE OUTPUT,NSET=SIDE
U,
*NODE OUTPUT,NSET=ROAD
U,RF
*END STEP
*******************************
*STEP,NLGEOM
 9: FREQUENCY RESPONSE WITH MOVING SOLID ONLY
*STEADYSTATEDYNAMICS,DIRECT,INTERVAL=EIGENFREQ
** 200.0, 260.0, 7 -> to produce manual figures
*BOUNDARY
TIRE-RIM,1,6
ROAD,1,2
ROAD,4,6
**
*BOUNDARY
 ROAD,3,3,0.001
**
*ACOUSTIC FLOW VELOCITY, ROTATION
 AIR,   0.01,
**
*OUTPUT,HISTORY,FREQ=1
*NODE OUTPUT,NSET=AIRCROWN
POR,
*NODE OUTPUT,NSET=AIRFOOT
POR,
*NODE OUTPUT,NSET=AIRSIDE
POR,
*NODE OUTPUT,NSET=SIDE
U,
*NODE OUTPUT,NSET=ROAD
U,RF
*END STEP
*******************************
*STEP,NLGEOM
 10: EXTRACT REAL EIGENVALUES WITH SOLID MOTION ONLY
*FREQUENCY,EIGENSOLVER=LANCZOS
 12, 200.0, 260.0
*OUTPUT,FIELD,FREQ=11
*NODE OUTPUT
 U,
*NODE OUTPUT,NSET=AIR
 POR,
*END STEP
*******************************
*STEP,NLGEOM
 11: COMPLEX EIGENVALUES WITH SOLID MOTION ONLY
*COMPLEX FREQUENCY,FRICTION DAMPING=YES
*ENDSTEP