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Re: OT-fundamentals in sound (was singing bowls)



I'd think a crystal water glass would provide a clearer demonstration and
analysis of the fundamental vibrational modes. Fairly uniform shape and
wall thickness, and tighter more uniform crystalline structure than the
hammered alloy.
-HS

At 03:53 PM 10/18/00 -0700, you wrote:
>Is a 15" loudspeaker cone small?  The 20" bowls vibrating surface is
>larger than the speaker size that is commonly used for generating loud,
>low freq.  I have casually mapped the vibrating surface and it seems to
>be virtually the entire sides of the bowl, down to the start of the
>base.  The bowl is small, but the radiating surface of the bowl seems
>large to me.  But small and large are relative terms, aren't they?
>
>Regarding efficiency, I cannot say how efficient the bowls are.  As you
>play them you constantly put energy into them.  I make no claims for
>the bowls efficiency, but they could be inefficient (and per stated
>principles) and still be loud and low freq.  It tires me to play them
>for very long, but I'm not sure how to quantify the energy I put into
>the bowl from the playing (how efficient is the energy transfer from my
>hand to the stick to the bowls edge?).  A single strike to the bowl
>will excite it at the low fundamental, if you hit it in the right area.
>
>Anyway, I am very curious about what is happening, and sorry if this
>thread is wearing thin for some of you.  I find the singing bowls
>fascinating and fun, and it is my nature to try and figure out how
>things work, especially sound (I too am an engineer, but acoustics are
>only a part of my job with disk drive design).
>I'll shut up now, and see what I measure.
>bret
>
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