k8yumdoober@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.

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@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. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

  This is a very nice technical discussion ...   Ulrich     In a message dated 12/9/2017 7:31:15 PM Eastern Standard Time, time@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@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. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

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: >> >> k8yumdoober@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. >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >