Modal Analysis (was Negative bearing (long))

[Delwin D Fandrich]

----- Original Message -----
From: "Phillip L Ford" <fordpiano@lycos.com>
To: <pianotech@ptg.org>
Sent: December 04, 2001 10:21 PM
Subject: Re: Modal Analysis (was Negative bearing (long))


> Ric,
> I'll check out the article.  I believe I have the address.  The sand
technique is a common
> method of visualizing the mode shapes of a vibrating body.  This is one of
the practical
> techniques I mentioned that violin makers use.  Whether Steinway does it I
don't know.
> When I was at the factory I didn't see any evidence of anything like this,
but maybe it is in
> one of the hidden rooms that Ron N. spoke of.
>
> Phil


I can't see any advantage to this. Other than as a teaching aid to help
understand how the soundboard works. It is only going to illustrate at what
point the soundboard resonances come in and what their shapes are. Again,
this is with an unloaded board. Everything is going to change once the
strings go on and their up to pitch.

Del