Soundboard stiffening

[gordon stelter]

Yeah. But the more rigid a structure is, the more
transmittant of vibratory energy it becomes.
     Thump

--- Phillip Ford <fordpiano@earthlink.net> wrote:
> >At the risk of oversimplification, isn't a crowned
> soundboard just a big
> >spring, the more you compress it, the more rigid it
> becomes?
> >
> >David Love
> >davidlovepianos@earthlink.net
> >
> 
> David,
> 
> This is the point that I was trying to make.  I
> believe that the 
> soundboard is essentially just a big spring.  A
> spring doesn't get 
> more rigid or stiff the more you compress it. 
> Within its working 
> range it has a constant spring rate or stiffness. 
> If a spring's 
> spring rate is 100 lb/in. then it takes 100 lbs to
> deflect it the 
> first inch.  It takes 100 additional lbs to deflect
> it another inch. 
> It doesn't matter if you start from a zero
> deflection point or an 
> initial 1 inch deflection point - the spring rate
> (or stiffness) is 
> still 100 lbs/in.  It's not getting stiffer because
> you're putting 
> load on it or deflecting it.  True, it takes twice
> as much load to 
> get twice as much deflection, but that is still a
> constant stiffness. 
> I would expect a soundboard to work the same way. 
> If the board is 
> actually getting stiffer as a result of applied load
> then it's not 
> acting like a spring or a beam, and I would like to
> understand what 
> mechanism is causing that to happen.
> 
> Phil Ford
> _______________________________________________
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