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A0 B0 A1 A-1 B1 B-1 ?

 
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Fgayford
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Joined: 21 Apr 2013
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Location: cambridge

PostPosted: Sat Jun 29, 2013 10:08 am    Post subject: A0 B0 A1 A-1 B1 B-1 ? Reply with quote

I have been studying the work of Carleen Hutchins.
In her work these terms are used without simple explanations of what they mean.
So far I believe I understand (please correct me if I have it wrong) that

A0 is the air cavity resonance frequency when blowing across the G side f hole. Is there a way to measure this freq with a microphone?

B0 is the entire violin body resonance freq when supported at a node near the nut and the at the widest part of the lower bout. (this took a week to find out gleaning through the entire internet)

The rest B1 B-1 A1 and A-1 in her articles just go on as if it is common knowledge. No matter how much I search no one explains these terms in a way that I can understand.
Thanks
Fred
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ctviolin
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Joined: 07 May 2009
Posts: 961
Location: Roswell

PostPosted: Sat Jun 29, 2013 2:24 pm    Post subject: Re: A0 B0 A1 A-1 B1 B-1 ? Reply with quote

Fgayford wrote:
The rest B1 B-1 A1 and A-1 in her articles just go on as if it is common knowledge. No matter how much I search no one explains these terms in a way that I can understand.
Thanks
Fred


I hope someone answers you about this Fred.

Probably fifteen years back I might have been able to answer you.

If no one does, I'll go ahead and look this particular up in my two vol. Research Papers in Violin Acoustics 1975 - 1993 (Carleen Hutchins, Editor)

If I can still lift the d*mned books, that is.
It'll be in there, multiple times, I guarantee it.
Lets wait a bit and see if someone answers first though, OK?
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DonLeister
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PostPosted: Sat Jun 29, 2013 6:01 pm    Post subject: Reply with quote

They are body and air resonances or modes. I can't tell you what they are but a site that might illustrate them for you is one by Martin Schleske (sp?). He has some color animations that should help , hopefully.
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ctviolin
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PostPosted: Sun Jun 30, 2013 12:24 am    Post subject: Reply with quote

Perhaps this?

http://www.catgutacoustical.org/research/articles/modetune/
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ctviolin
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PostPosted: Sun Jun 30, 2013 12:30 am    Post subject: Reply with quote

Plenty of references there to refer to also.

Fgayford, if you ever get anything out of this inquiry that helps you make better violins, or even helps you understand them better, please post of the results here ...


Thank you,
ct
(Craig Tucker)
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Fgayford
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PostPosted: Sun Jun 30, 2013 9:56 am    Post subject: Reply with quote

DonLeister wrote:
They are body and air resonances or modes. I can't tell you what they are but a site that might illustrate them for you is one by Martin Schleske (sp?). He has some color animations that should help , hopefully.


Thanks Don
Lots of info there to digest.
Fred
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