Card 5 - Dimensional and Inertial Properties: Veh2

A2

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