Hi,

I am carrying out an analysis of a tyre by employing steady state transport analysis taken from abaqus manual. According to abaqus example manual in order to obtain braking conditions, translational ground velocity has to be applied together with  a spinning angular velocity to NTIRE node set, which effectively constitutes of all tyre nodes,  by using *TRANSPORT VELOCITY and *MOTION options. My question is why  translational velocity was applied to the whole tyre, which apparently fixed at a rim node of a tyre. Should not it be applied to the reference node of a road suraface instead? I would appreciate if anybody, who dealt with tyre simulation, explained this peculiar  matter?  

*STEP,INC=300,NLGEOM=YES,UNSYMM=YES

1: STRAIGHT LINE ROLLING (Full braking)

*STEADY STATE TRANSPORT, LONG TERM 0.5, 1.0

*CHANGE FRICTION,INTERACTION=SRIGID

*FRICTION,SLIP=0.02 1.0

*TRANSPORT VELOCITY

NTIRE, 8.0

*MOTION,TYPE=VELOCITY,TRANSLATION

NTIRE, 1, , 2.7778

Thanks a lot!

Dmytro