## Card 5 - Dimensional and Inertial Properties: Veh2

 B2 TR2 FIZ2 FMASS2 TR2R XF2 XR2 YS2 5

 Card:  Field Variable Description Original Units Default Units Metric Units 5:1 A2 a2 The distance from the center of gravity of V2 to the midpoint between the front wheels. inches mm 5:2 B2 b2 The distance from the center of gravity of V2 to the midpoint between rear wheels, taken as positive. inches mm 5:3 TR2 T2 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 IZ2 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). lb-sec2-in kg-m2 5:5 FMASS2 M2 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) lb-sec2/in lbs kg 5:6 TR2-R T2R (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 m-smac input card(s) 11. Inches mm 5:7 XF2 XF2 Distance from center of gravity of V2 to the front end of the car body. Inches mm 5:8 XR2 XR2 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 YS2 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

More:

Tire Properties