Hi,
Recommended reading relating to this is the acoustical and audio
engineering material.
"Acoustical Engineering" by Harry F. Olson is a really good book. I
covers many of the theory work on speakers etc. and uses electrical
models and ways to estimtate their effects. This book I have used to
again and again debunk "new" speaker concepts, as it turns out it has
already been tried before.
AES have released 4 collections of articles out of JAES on speakers. In
there is the moderload of Thiele-Small articles that extends the work of
Olson to more and more refined methods. Estimating the losses and
resonant properties is a key aspect, as they have huge impact on the on
the audio.
Also, there is a good book on acoustics by Beranek, of
Bolt-Beranek-Newman if that rings a bell to Internet old-timers, which
may be applicable.
I could do a more detailed dig in my library if needed, but there is
some good material out there.
Cheers,
Magnus - AES member and used to do professional audio PA system design
On 12/10/2017 01:30 AM, Bill Byrom wrote:
The Q of Helmholtz resonators is derived here:
https://en.wikibooks.org/wiki/Acoustics/Flow-induced_Oscillations_of_a_Helmholtz_Resonator
Some Q measurements of bottles are described here:
https://math.dartmouth.edu/archive/m5f10/public_html/proj/ArainGolvach.pdf
--
Bill Byrom N5BB
On Sat, Dec 9, 2017, at 01:39 AM, Hal Murray wrote:
[email protected] said:
The flex hose demonstration was interesting in that different regimes of
swinging speed resulted in oscillation in different modes. I wonder why.
It depends on the speed of the air going through the tube.
https://www.youtube.com/watch?v=4aJ36-TlPD4
http://www.exo.net/~pauld/activities/AAAS/aaas2001.html
http://www.exo.net/~pauld/summer_institute/summer_day13music/Whirly.html
--
These are my opinions. I hate spam.
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