B1 
TR1 
FIZ1 
FMASS1 
TR1R 
XF1 
XR1 
YS1 

4 
Card: Field 
Variable 

Description 
Original Units 
Default Units 
Metric Units 
4:1 
A1 
a_{1} 
The distance from the center of gravity of V1 to the midpoint between the front wheels, taken as positive.. 
inches 

mm 
4:2 
B1 
b_{1} 
The distance from the center of gravity of V1 to the midpoint between rear wheels, taken as positive. 
inches 

mm 
TR1 
T_{1} 
Average tread width; i.e., distance between the center of the left and right tires, averaged over front and rear pairs. (optional) Front tread width; i.e., distance between the center of the left and right front tires if the Rear tread width is input in card 4 field 6 below. 
inches 

mm  
FIZ1 
I_{Z1} 
Yaw moment of inertia of V1. This is a measure of the torque needed to induce a rotation about a vertical axis through the center of gravity of V1 and it depends both on the total mass of the vehicle and on how far this mass is, on average, from the center of gravity. For typical values of mass and of l (lz1=k xM), see the back page of this manual (from the CRASH3 Manual) 
lbsec^{2}in 

kgm^{2}  
4:5 
FMASS1 
M_{1} 
The total mass of V1. If vehicle weight in lbs is known, its mass can be found by dividing by 386.4. (For DEFAULT option input is for weight) 
lbsec^{2}/in 
lbs. 
kg 
4:6 
TR1R 
T_{1R} 
(optional) Rear tread width; i.e., distance between the center of the left and right rear tires. Note: This field in original SMAC was used for an optional rear axle steer angle; The inputs for vehicle 1 rear steer angle time history can optionally be input on msmac input card(s) 10. 
inches 

mm 
4:7 
XF1 
X_{F1} 
Distance from center of gravity of V1 to the front end of the car body, taken as positive . 
inches 

mm 
4:8 
XR1 
X_{R1} 
Distance from center of gravity V1 to the rear end of the car body, taken as negative, may be entered as positive or negative. 
inches 

mm 
4:9 
YS1 
Y_{S1} 
Distance from the center of gravity of V1 to the side of the car body; 1/2 total width (this conforms with original SMAC). YS1 may also be entered as the total vehicle width. The magnitude of YS1 is compared to the Track Width (TR1) and if YS1 > TR1, the input is assumed to be for the total width. 
inches 

mm 
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