Bell Modes vs Bar Modes?

Hi All,

While my oxygen tank project is making way, I had an interesting
variation last night where in two outwardly similar bells, the longer
one had a higher pitch than the shorter one.

At one point the difference between Bell Modes and Bar Modes was
mentioned to me. I am looking for more information on these "modes".
- What are they (;->)?
- How do they differ?
- What are their general characteristics?

I was told that both in Bell & Bar modes, frequencies increase when
the "Bell" is shortened. So, while this may be the wrong tree to be
climbing, I still should probably understand the differences.

Thanks in advance,

Flint Weiss
the Great Homemade Bell Project
http://www.squidgey.com/bells/

[Flint Weiss wrote:]
>While my oxygen tank project is making way, I had an interesting
>variation last night where in two outwardly similar bells, the longer
>one had a higher pitch than the shorter one.

>At one point the difference between Bell Modes and Bar Modes was
>mentioned to me. I am looking for more information on these "modes".
>- What are they (;->)?
>- How do they differ?
>- What are their general characteristics?

>I was told that both in Bell & Bar modes, frequencies increase when
>the "Bell" is shortened. So, while this may be the wrong tree to be
>climbing, I still should probably understand the differences.

>Thanks in advance,

>Flint Weiss
>the Great Homemade Bell Project
>http://www.squidgey.com/bells/

Hi, Flint! I know a little something about dynamics, but nothing at all
about steel cylinders beyond what I can try to visualize. I believe
that the lowest, and most audible, frequencies will be produced by
deformation of the circular shape. This frequency would rise as the
thickness of the steel rises, but would be independent of the length of
the cylinder.

Hope this helps. Sorry, I'm not sure what the "Bell" and "Bar" modes
are, though one of them ("Bar"?) is sure to be the bending of the
cylinder along its length. I'd expect this to be supersonic for any
reasonable cylinder.

JdL