[pianotech] FW: [PTG Pianotech]: RE:plate stress- Finite element model

[Ron Nossaman]

On 4/30/2012 11:30 AM, Michael Spreeman wrote:
>
>
> Wayne Stuart thought the weight of his iron frame was excessive. To
> quote: "The detailed finite element model of the existing Stuart and
>  Sons piano frame was built and solved using Strand7. The complex
> geometry of the piano's cast iron frame was modelled using over 5000
>  "thin shell" plate elements. The various colours of these elements
> in the model designate sections of different thickness." Here's the
> link which also has the color coded image:
> www.strand7.com/html/pianopaper.htm
>
> The new and improved "Stuart Lite" ?

Thanks Michael, interesting stuff. What I don't understand is why he 
wants the plate lighter. High mass is a desirable component unless you 
want the plate sucking energy from the soundboard - unless infinite 
stiffness is obtainable. Yea, it's four feet thick, but man is it light 
and stiff!!!
Ron N