Klarinet Archive - Posting 000146.txt from 2010/08

From: Tony Pay <tony.p@-----.org>
Subj: Re: [kl] About clarinet acoustics
Date: Mon, 16 Aug 2010 14:53:00 -0400

On 15 Aug 2010 at 11.15, Jennifer Jones wrote:

> It appears there are some end effects that make the (L+2a) approximation not quite
> correct in the presence of a bell, as indicated by the section "End
> corrections are more complicated in real instruments" at (4)
> http://www.phys.unsw.edu.au/jw/musFAQ.html#end. It states that bells
> are more complicated and links the reader to clarinet acoustic
> impedance. It appears the end correction is non-linear in the
> presence of a bell.

On 15 Aug 2010, at 17:43, Diego Casadei wrote:

> I cannot explain the 8 cm, I simply measured it. My measurement does not claim to be as precise as 1 mm but it should be at least within 1 cm from the true position. It would be good if the real experts with the needed equipment could make this measurement, repeated over different tones. Unless I made big mistakes, I have experimentally shown that the node is far from the vibrating edge of the reed.

What happens if you take the bell off, and measure it again, Diego? I've left my clarinets in the Accademia Chigiana for the weekend plus 'Palio Monday' so I can't do it myself.

Tony
--
Tony Pay
79 Southmoor Rd
Oxford OX2 6RE
tel/fax +44 1865 553339
mobile +44 7790 532980
tony.p@-----.org

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