Is there a way to get the contact friction reference frame in CFFSUB?

The contact incident marker is defined such that the x-direction is always in the slip velocity direction. I'd like to limit the friction force to only act relative to a direction cosine given by another part, and so break the contact friction into x- and y- forces in the contact incident reference frame to accomplish this.

Think of a box rolling on a surface with roller bearings, where the surface is inclined down at 45 degrees relative to the rotation axis of the roller bearings.

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0 Henrik.Skovbjerg over 2 years ago

Like all Adams Solver subroutines, the CFFSUB can take values into the PAR-array.

So if you add a marker-ids into the CFFSUB user function like this:

(.model_1.part_2.marker_3.adams_id), (.model_1.ground.reference.adams_id)

Then the Adams ID of the markers will appear in the CFFSUB PAR-array: fric->PAR[0] and fric->PAR[1]

You can then use a SYSFNC call to get the position of the first marker relative to the second marker:

double ipar[3], dx;

int errflg;

ipar[0] = fric->PAR[0];

ipar[1] = fric->PAR[1];

ipar[2] = fric->PAR[2];

c_sysfnc("DX", ipar, 3, &dx, &errflg);
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0 Henrik.Skovbjerg over 2 years ago

Like all Adams Solver subroutines, the CFFSUB can take values into the PAR-array.

So if you add a marker-ids into the CFFSUB user function like this:

(.model_1.part_2.marker_3.adams_id), (.model_1.ground.reference.adams_id)

Then the Adams ID of the markers will appear in the CFFSUB PAR-array: fric->PAR[0] and fric->PAR[1]

You can then use a SYSFNC call to get the position of the first marker relative to the second marker:

double ipar[3], dx;

int errflg;

ipar[0] = fric->PAR[0];

ipar[1] = fric->PAR[1];

ipar[2] = fric->PAR[2];

c_sysfnc("DX", ipar, 3, &dx, &errflg);
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