Plate load- piano engineers know this?--how?

[KeyKat88 at aol.com]

Greetings, 
 
         Is there any way to view exactly how stringing a piano effects the 
stress on the harp plate? For example, if you had an unstrung plate and only 
strung the bass would it have any compressive or tensile stress effect/changes 
on the high treble section of that plate and visa-versa ; stringing only the 
high treble...effects bass section of plate?  
 
          What if you only strung the center, would that have any effect on 
either bass or treble end or both? How can I get an idea of what are those 
stresses are and is there any way they can be viewed graphically or measured 
throughout the casting? 
 
           Is the only way we know that the stresses are present is by how 
the piano behaves during a pitch raise? And how do we separate/differentiate 
what forces are happening in the plate, as opposed to what stresses are absorbed 
by the bridges and the force they are either releiving or transferring off the 
plate to themselves or elsewhere in the instrument, i.e. transfered to the 
sound board and/or case and/or rim? Do piano companies' R&D have a way of 
testing these things? If so how?
 
Thanks in advance,
Julia Gottshall
Reading, PA



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