Im actually working on a sound installation which is involved with acoustic archeology in which Im hoping to experiments with resonances , this kind of thing :
http://www.otsf.org/archaeoacoustics.html In this case a huge circular henge (3.5 m high banks) 180 m in diameter. https://en.wikipedia.org/wiki/Giant%27s_Ring Obviously with no roof resonance will not be as pronounced but there is still likely to be some sort of modal behaviour, especially if there had been many people singing/chanting etc . Apparently you cant work out modes for circular structures in the normal way by halving wavelength in relation to room dimensions etc A family member of mine is a physicist and suggested this might be useful to work out modes for an open circular structure : https://en.wikipedia.org/wiki/Vibrations_of_a_circular_membrane#Animations_of_several_vibration_modes Then the following equation : Lowest frequency will be from longest wavelength which is 2 X pi X r/2.404 (where r is radius of your circle) the next frequency has wavelength 2 pi r/3.83 = 1.64 x radius. And then 2 pi r/5.135 etc etc However this gives very long wavelengths - the highest mode is 11.61 there, but for me to calculate audible modes I would need numbers in this series above 150 or so (to get shorter audible wavelengths. Could anyone give numbers in the same series of numbers but above 150 ? On 5 March 2016 at 21:31, Martin Leese <martin.le...@stanfordalumni.org> wrote: > Augustine Leudar wrote: > > > Ive had a search online but cant really find much literature about this. > > Can anyone tell me anything about the acoustics of circular rooms/spaces > ? > > How to standing waves behave in circular spaces ? > > There was a discussion several years ago in > one of the rec.audio.* newsgroups on standing > waves in *spherical* rooms. Unfortunately, > Google Groups has deleted all the older posts, > but this post might be it: > https://groups.google.com/forum/#!search/"spherical$20room"$20audio/ > rec.audio.pro/hLCCrmlSFdw/Lq_80PhAZQ0J > > (In case the link does not work, I went to > groups.google.com and searched for: > "spherical room" audio > with the double quotes.) > > Regards, > Martin > -- > Martin J Leese > E-mail: martin.leese stanfordalumni.org > Web: http://members.tripod.com/martin_leese/ > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, > edit account or options, view archives and so on. > -- www.augustineleudar.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20160306/ea837eb7/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
