B2 
TR2 
FIZ2 
FMASS2 
TR2R 
XF2 
XR2 
YS2 

5 
Card: Field 
Variable 

Description 
Original Units 
Default Units 
Metric Units 
5:1 
A2 
a_{2} 
The distance from the center of gravity of V2 to the midpoint between the front wheels. 
inches 

mm 
5:2 
B2 
b_{2} 
The distance from the center of gravity of V2 to the midpoint between rear wheels, taken as positive. 
inches 

mm 
5:3 
TR2 
T_{2} 
Average tread width, i.e., distance between 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 5 field 6 below. 
inches 

mm 
5:4 
FIZ2 
I_{Z2} 
Yaw moment of inertia of V2. This is a measure of the torque needed to induce a rotation about a vertical axis through the center of gravity of V2, 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} 
5:5 
FMASS2 
M_{2} 
The total mass of V2. If vehicle weight in lbs. is known, can be found by dividing by 386.4. (For DEFAULT option input is for weight) 
lbsec^{2}/in 
lbs 
kg 
5:6 
TR2R 
T_{2R} 
(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 2 rear steer angle time history can optionally be input on msmac input card(s) 11. 
Inches 

mm 
5:7 
XF2 
X_{F2} 
Distance from center of gravity of V2 to the front end of the car body. 
Inches 

mm 
5:8 
XR2 
X_{R2} 
Distance from center of gravity V2 to the rear end of the car body, (taken as negative, may be entered as Positive or negative). 
inches 

mm 
5:9 
YS2 
Y_{S2} 
Distance from the center of gravity of V2 to the side of the car body; 1/2 total width (this conforms with original SMAC). YS2 may also be entered as the total vehicle width. The magnitude of YS2 is compared to the Track Width (TR2) and if YS2 > TR2, the input is assumed to be for the total width. 
inches 

mm 
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