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1-Newbie

## Applying Rotational Constraints?

How do you apply rotational constraints when doing the structural simulation in Creo? I'm using rack and pinion from power steering system for the simulation.

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4 REPLIES 4
17-Peridot
(To:ptc-6787851)

Use a pin constraint. The 3rd entry is an optional rotation constraint. Use two planes to define the angle. These planes must be parallel to the pin axes.

1-Newbie
(To:TomD.inPDX)

Thank you for the answer, but it's a little confusing. Do you mind explaining step by step in detail.

Sorry for the trouble.

17-Peridot
(To:ptc-6787851)

I may have misread your question. I was thinking constraining the parts in an assembly, not providing rotational stress for analysis.

I only have the simulate light version, and I do not see rotational loads as an option.

3-Visitor
(To:ptc-6787851)

There's a couple different ways you can do this:

1. You can apply a Total Load at Point (TLAP), define a measure to calculate the rotation of the point that the TLAP is referenced to, solve the model, look at the rotation measure, then scale the TLAP such that you'd get the proper rotation (assuming your model is linear).
2. You can create a datum point that is offset (but on axis) and use a rigid link to connect that datum point to whatever entity you want to rotate, then create a constraint at the datum point and define a prescribed rotation.
3. You can do the same as #2, but create two datum points (one on top of another), create a weighted-link from one datum point to the entity you want to rotate, create a very stiff zero length spring between the two datum points, and then apply a prescribed rotation constraint on the other end of the datum point.

What method you use depends entirely your simulate goals, the physics you're trying to model, the geometry of the problem, etc.