conflicting motions - overconstrained model - Inspire Motion

Amir_20976

Hey guys,

Check it out, here's the deal... I'm trying to mimic how a car's suspension and wheel work in a simulation. I got this motor, simulating the wheel's rotation, and it's hooked up to the hub – works like a charm.

But here's where it gets interesting. To simulate a bump, I set up an actuator under the tire. Now, the solver starts throwing a tantrum with the message "Model May Be Overconstrained". Makes sense to me intuitively, but I'm not giving up just yet. I'm really curious to see how this spinning tire would handle hitting a bump. and the same error pops up when I use the motor to simulate making a turn.

So, what's got me scratching my head is: How can I inject a different kind of movement – whether it's another motor or that actuator – into a spinning body?

Thanks
Amir

Scott Ziemba_21777

Hi Amir,

• I am guessing the Redundant Constraint message stopped the solve completely and was not just a warning?  Are these flexible or rigid joints?  Be advised that in 2022.3, 6 DOF linear Bushings were introduced for motion analysis.  Might be applicable in your example??
• Make sure your motor and actuator are not using implicit joints (Restrain Centerline and Maintain Coaxiality options).
• Inspire has built-in sensors to warn/halt if there are misalignments between motors, actuators and joints that violate alignment and deformation sensor criteria.  If you know that the message is being thrown because of some deliberate input you are attempting (simultaneous motions), you can try setting Runtime Sensors to None, under the motion Run Settings:

Just be sure that after you solve, you visually verify that your simulation looks good, the model did not break apart, and you are not allowing large deformations at certain joints.

Hope that helps.

Scott Z