Hi all,
The question came up recently on Tom Wishon's forum regarding the most
stable plane of shaft oscillation (if there is such a thing). Assume a
simple shaft with more and less stiff bending planes (hence higher and
lower frequency planes), 90* apart. Is one of these two planes more stable
in lateral oscillation than the other? If so, why? Another way of posing
the question is if you twang the shaft in a plane half way between the two
(at 45* to either) and wait for the shaft oscillations to decay into a
single plane, which will it be?
Thanks,
Alan Brooks
Hi Alan,
I often find that the s1 plane is more stable than the n1 plane but I do not align it to the target because I believe that their is always a tendency to turn away from it and a tendency to turn to the n1 plane and that is why I align it to the target or at least within a few degrees of it depending on flo.
David
