Example: PCTOPT (% Force inputs option) inputs

The PCTOPT option permits the specification of the wheel drag force on the vehicle to be a percentage (%) of the weight on the wheel. This provides for a more straight forward procedure to apply drag to the wheels.

The above table in Cards 8,9, Example 2 can be created using the PCTOPT1 option as follows:

You can set the PCTOPT1=1.0 (card 8, field 5) but also note that the program will check and for all inputs

≤ | 1.0 |. If true the program assumes the inputs are for % drag.

To lock the RF wheel, set the % drag to -1.0. A drag force equal to the weight on the wheel will be applied.

To add engine braking, with approximately 50% of the weight on the rear wheels, to produce 10% total vehicle drag you would need to apply a % drag of -.20/MU to each of the Rear wheels. Where MU is the coefficient of friction. So assuming a coefficient of friction of 0.70, the following would produce the desired results:

# Sample Input Table: RF lock and Rear engine braking, collision at 0.50 sec

0.4 0.70 0.05 0.0 1.0 8

0.40 0.0 0.0 0.0 0.0 1 8

0.45 0.0 0.0 0.0 0.0 2 8

0.50 0.0 0.0 0.0 0.0 3 8

0.55 -0.50 0.0 -.143 -.143 4 8

0.60 -1.00 0.0 -.286 -.286 5 8

0.65 -1.00 0.0 -.286 -.286 6 8

0.70 -1.00 0.0 -.286 -.286 7 8


More:

Example: Variable increment (VARINC) inputs