Card 96 - Center of Collision Interface (CCI)

Optional Center of Collision Interface (CCI)

Card 96 - Center of Collision Interface (CCI)

The original version of SMAC had the limitation that the center of collision interface (origin for the radial springs of the collision model) had to be coincident with the Center of Gravity of the vehicle. This limitation can occasionally produce problems in simulated impacts where the damage may get close to and/or exceed the Center of Gravity of the vehicle. To accommodate these situations and as a part of research towards a more general fix, McHenry Software has provided an option to specify a separate location for the center of collision interface.

A long term general fix for the occasional problems encountered with the center of collision interface will be an automatic generalized re-positioning based on impact configuration. In general, you should only reposition the CCI location for those instances where the predicted damage occurs either close to the Center of Gravity or when default location of the CCI at the CG results in "PRESJ or PREJ tends negative" error messages and/or a jagged damage interface.

The expected generalized logic for re-positioning the center of collision interface will be to move the Center of Collision interface away from the impact location toward the opposite side or end of the vehicle (i.e., for a 90 degree impact on the right side (+X) the Center of collision interface would be set to CCIY=-20”).

This option is provided for advanced users and you are cautioned against arbitrarily changing the location of the Center of Collision Interface (CCI). You should carefully review and test the effects of moving the CCI for your particular application.

CCIX1

CCIY1

CCIX2

CCIY2

Card: Field

Variable

Description

Original Units

Metric Units

Optional Center of Collision Interface Specification

96:1

CCIX1

Option X location of the Center of Collision Interface for V1 specified relative to V1’s Center of Gravity.(+ towards front of vehicle, - towards rear of vehicle).

In.

96:2

CCIY1

Option Y location of the Center of Collision Interface for V1 specified relative to V1’s Center of Gravity.(+ towards right side (passenger side) of vehicle, - towards left side (drivers side) of vehicle).

In.

96:3

CCIX2

Option X location of the Center of Collision Interface for V2 specified relative to V2’s Center of Gravity.(+ towards front of vehicle, - towards rear of vehicle).

In.

96:4

CCIY2

Option Y location of the Center of Collision Interface for V2 specified relative to V2’s Center of Gravity.(+ towards right side (passenger side) of vehicle, - towards left side (drivers side) of vehicle).

In.

The following inputs are for interaction between Veh#1 Trailer and Vehicle #2

96:5

CCIX1-2

Option X location of the Center of Collision Interface for V1 trailer specified relative to V1’s Trailer Center of Gravity.(+ towards right side of vehicle, - towards left side of vehicle).

In.

96:6

CCIY1-2

Option Y location of the Center of Collision Interface for V2 trailer specified relative to V2’s Trailer Center of Gravity.(+ towards front of vehicle, - towards rear of vehicle).

In.

96:7

CCIX2-2

Option Y location of the Center of Collision Interface for V2 for interaction with V1 Trailer specified relative to V2’s Center of Gravity.(+ towards right side (passenger side) of vehicle, - towards left side (drivers side) of vehicle).

In.

96:8

CCIY2-2

In.

Gravitational Forces Simulation