## Card 56 - Tire Properties – Veh3

 CSTF3(1) CSTF3(2) CSTF3(3) CSTF3(4) XCCI(3) TIRMU3(1) TIRMU3(2) TIRMU3(3) TIRMU3(4) 56

 Card:  Field Variable Description Original Units Default Units Metric Units 56:1 CSTF3(1) C11 Cornering stiffness for small slip angles of right front tire of V3. For additional discussion and an example calculation procedure please see example following card 7. Tire cornering stiffness properties are input separately to allow the simulation of tire damage.  A damaged tire which has lost its pressure will have substantially lower cornering stiffness, perhaps 20 percent of that for an undamaged tire. Under-inflated tires will have somewhat lower cornering stiffnesses than those of properly inflated tires, but far greater than seriously damaged tires. Inputs for the cornering stiffness may be entered as positive or negative (for conformity with original SMAC). Please also see discussion on cornering stiffness below. lb/radian lbs/deg N/deg 56:2 CSTF3(2) C12 Cornering stiffness, left front tire of V3. lb/radian lbs/deg N/deg 56:3 CSTF3(3) C13 Cornering stiffness, right rear tire of V3. lb/radian lbs/deg N/deg 56:4 CSTF3(4) C14 Cornering stiffness, left rear tire of V3. lb/radian lbs/deg N/deg 56:5 XCCI(3) Distance from vehicle CG to the center of collision interface.  It is positive for CCI ahead of CG (generally=0.0).  (This early version of the option has been replaced by the input format on Card 96.  Please refer to Card 96.) Inches mm Veh1 Tire friction factor multiplier The Optional TIRMU inputs permits the simulation of individual tires which have drag factors different than the nominal MU (i.e., metal gouging, etc.). If entered as 0.0, program assumes default value of 1.0 (normal).A value of TIRMU of 0.86 would reduce the effective friction coefficient for a tire from a nominal of 0.70 to 0.60. The nominal friction coefficient is determined for an individual wheel by either the friction zone as specified on input card 12 or by a polygon friction zone specified on card(s) 30,31,32. NOTE: The optional tire friction factor multiplier (TIRMU) for Vehicle 1 may be changed during a simulation run (e.g., a tire deflates and rim gouges), see optional input card 44. 56:6 TIRMU3(1) RF Vehicle 3 Tire friction factor multiplier . 56:7 TIRMU3(2) LF Vehicle 3 Tire friction factor multiplier. 56:8 TIRMU3(3) RR Vehicle 3 Tire friction factor multiplier. 56:9 TIRMU3(4) LR Vehicle 3 Tire friction factor multiplier.

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Card 58 - Braking/Tractive Force Tables: Veh3