Guru's,
I have an assembled shaft running in two bearing with non-symmetric
loading. The shaft isn't just straight, but actually a "yoke" of sorts
that looks like this with the arrow representing the non-symmetric
loading:
With it's major axis on the bottom with cylindrical roller bearings
located on each side. There also is a thrust bearing on one side that
handles the resulting load component from the non-symmetric loading as
well as providing the location reference. Obviously, it's a bit more
complicated than all this, but this should suffice for what I'm about to
ask.
The cylindrical roller bearings do not provide any axial location, only
radial. The bearing manufacturer has provided a stiffness (spring rate)
for the bearing which I would like to incorporate in order to accurately
capture the deflections, particularly of the side members.
I can radially fix both bearing axii, and the thrust surface
accordingly, but that greatly underestimates all the deflections (as
well as stresses...). What I am looking for is a way to "free up" the
bearing axis constraint without getting into an elaborate set up that
takes forever to solve. I thought if I could somehow fix a "center
point" of the bearing on the axis BUT allow the actual component to
rotate about this, it would more closely follow what we expect. If I
could also let it move on the axis that would be even more appropriate.
Any ideas? Would the "ball" constraint that I believe is available in
WF 5.0 work here? Maybe not perfectly, but better than just
constraining the axis? Suggestions? Comments? Links to recommended
practices? 😉
We have run these types of analyses with Ansys and set up the bearing
with it's spring rate and contacts to give us the deflections as we
think they are, but that takes long and isn't as flexible in working
thru design iterations/optimizations as what I can do in Mechanica. I
do lots of component level work as well as some subassembly work on
these types of assemblies in Mechanica to help work thru the design VERY
quickly, but I'm always stuck with not being able to represent the
bearing freedom.
Thanks in advance...
Paul Korenkiewicz
FEV , Inc.
4554 Glenmeade
Auburn Hills, MI, 48326-1766
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