Need help finding an article I read in the past year or so.
It detailed a (two?) step process for measuring then applying loads to a model so it's perfectly balanced in space. After the balanced loads are applied to the model, a constraint is added to keep the model from drifting in space. The constraint has minimal reaction force.
I believe it was a large backhoe arm if that helps jog memories.
Suggested technique? Profiles magazine?
Anyone else remember reading this?
I really think it was a suggested technique in the PTC knowledge base, but after many searches I've failed to find it.
Bruce Peterson Great Plains Mfg. Assaria, Ks 67416
In Wildfire 3.0, use the inertia relief option on the analysis definition form, which works a treat.
Otherwise, use the 'three-point' constraint method. Briefly:
Make three datum points on your model, well away from any stress concentration and defining a plane of symmetry (if your model is symmetric). It's best to make a co-ordinate system as well. Constrain the first point (located at the origin) in all three translations. Then constrain the second point in the translations except for the direction defined by points 1 to 2. (If point 2 is on the x-axis X should be free.) The third point is constrained to stop the model spinning about the axis created by points 1 and 2. So if point 3 is on the y-axis it should be constrained in the Z direction.)