Thanks in advance to anyone who can help me. I am running an analysis on a lifting fixture where I need a single point to lift from for moving the fixture around, not for moving its intended load. I set up an interface for a shackle located directly above the CG, provided by Creo, set up a rigid link between this interface and a point 1" above it and constrained that point in translation and kept all the rotations free. I applied a gravity load, vertically, and the results provided had wild displacements placed the CG no where near being under constraint. Not sure if gravity is working correctly or not in this simulation. I cant figure our why the CG moved so much.
I tried another method where I added a second point 18" above the first one over the interface and put a beam element between the two and fully released the beam at the lower part where the shackle would be and allowed rotation in all axis at the top. I also moved my constraint to the top point. Additionally I added a very light ground spring to the assembly to constrain anything I may have missed. I ran this case with gravity and while it looked more realistic than the first run but it still threw the CG well out from under the constraint point. Interestingly the beam still remained vertical and did not displace in any direction except a small vertical displacement which is to be expected due to gravity and from the beam releases not adding any moment into the beam.
Has anyone dealt with simulating a hanging load before under a single point or had any of these problems? Or is there anyway that simulate can calculate a different CG than when in modeling? I am lost as to why this is acting this way.
