Soundboard animation

[b98tu@t-online.de]

Hi Ric,

Will do my best to set up more animations.

I think the travelling transversal waves are often misinterpreted as 
longitudinal movements
because of their travelling direction in the longitudinal direction with a 
wavespeed usually denoted as "c".
The real longitudinal waves in the wood play the same minor or even 
negligible role in the soundboard
as the rotational vibrations in the strings in my opinion, because they have 
no coupling to the air.
(not in the strings,.where they can cause serious ringing).

regards,

Bernhard

----- Original Message ----- 
From: "Ric Brekne" <ricbrek@broadpark.no>
To: "pianotech" <pianotech@ptg.org>
Sent: Thursday, February 16, 2006 3:28 PM
Subject: Soundboard animation


> Hi Bernhard
>
> I would certainly like to see more animations if you could make those 
> available.  For different input frequencies and longer sustain for sure. 
> I'm suprised no one has jumped in yet and commented on the vibrational 
> characteristics displayed.  I found it interesting to watch the wave 
> development evident in the right side illustration. Struck me as quite 
> similar to string vibration really... appears like a traveling wave starts 
> off and turns into more or less a kind of standing wave action real quick. 
> It brought to mind some thoughts about the discussion we had a few years 
> back on how the internal longitudinal wave action in the panel works 
> together (or not) with the transverse wave action visable.
> If you can set up more animations... please do so.
>
> Cheers
> RicB
>
> ------
>
> If there is interest, i could show more of that animations with longer
> sustain and more tones on different soundboard locations or even with
> different soundboard shape (with /without cutoff bar, other rib 
> dimensions,
> other soundboard thickness, wood grain orientation etc.) at a higher
> resolution  with a beamer on a convention.
>
> regards,
>
> Bernhard
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