[time-nuts] Helmholtz Resonator and other Maintained Oscillators

[Ulrich Rohde]

This is a very nice technical discussion ...
 
Ulrich
 
 
In a message dated 12/9/2017 7:31:15 PM Eastern Standard Time, time at radio.sent.com writes:

 
 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:
> 
> k8yumdoober at gmail.com 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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