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modeling wheel on road

Altair Forum User

Hello to all,

I'm trying to model a wheel that rotates on a plane without slipping, but that can lift off the floor when it's needed. I used the contact command and Poissoin's algorithm, but I wonder if there is another way to do it. Is it necessary to write a subroutine?

thank you

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MotionView/MotionSolve

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Altair Forum User

Have you tried with GCON (Constrained General)?

Altair Forum User

thank you for replying.

yes i've thought about it, but my problem is how to write the script (Python or Matlab). Is there any example?

thank you

Altair Forum User

You can refer to MotionSolve help. Here is a sample for GCON which is available on help:

Example

1.	Three GCONs that together are equivalent to a spherical joint.

# Get the ids of the I and J markers

iid = imrkr.id

jid = jmrkr.id

# Create the expression strings

strx = “dx({i},{j})”.format(i=iid, j=jid)

stry = “dy({i},{j})”.format(i=iid, j=jid)

strz = “dz({i},{j})”.format(i=iid, j=jid)

# Define the 3 GCONS: DX(I,J)=0, DY(I,J)=0, DZ(I,J)=0

gx = Gcon (function=strx, i=imrkr, label=”X-Constraint”)

gy = Gcon (function stry, i-imrkr, label=”Y-Constraint”)

gz = Gcon (function=strz, i=imrkr, label=”Z-Constraint”)

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