A3 
B3 
TR3 
FIZ3 
FMASS3 
TR3R 
XF3 
XR3 
YS3 

54 
Card: Field 
Variable 

Description 
Original Units 
Default Units 
Metric Units 
54:1 
A3 
A_{3} 
The distance from the center of gravity of V3 to the midpoint between the front wheels, taken as positive.. 
Inches 

mm 
54:2 
B3 
B_{3} 
The distance from the center of gravity of V3 to the midpoint between rear wheels, taken as positive. 
Inches 

mm 
54:3 
TR3 
T_{3} 
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 
54:4 
FIZ3 
I_{Z3} 
Yaw moment of inertia of V3. This is a measure of the torque needed to induce a rotation about a vertical axis through the center of gravity of V3 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 (lz3=k xM), see the back page of this manual (from the CRASH3 Manual) 
lbsec^{2}in 

kgm^{2} 
54:5 
FMASS3 
M_{3} 
The total mass of V3. 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 
54:6 
TR3R 
T_{3R} 
(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 3 rear steer angle time history can optionally be input on msmac input card(s) 60. 
inches 

mm 
54:7 
XF3 
X_{F3} 
Distance from center of gravity of V3 to the front end of the car body, taken as positive . 
inches 

mm 
54:8 
XR3 
X_{R3} 
Distance from center of gravity V3 to the rear end of the car body, taken as negative, may be entered as positive or negative. 
inches 

mm 
54:9 
YS3 
Y_{S3} 
Distance from the center of gravity of V3 to the side of the car body; 1/2 total width (this conforms with original SMAC). YS3 may also be entered as the total vehicle width. The magnitude of YS3 is compared to the Track Width (TR3) and if YS3 > TR3, the input is assumed to be for the total width. 
inches 

mm 
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