Robbie Rhodes asked:

> Do studies exist about structural resonance in organ pipes?

Try the folks at Laukhuff:  http://www.pianos.de/laukhuff/index.html
or Orgelbau Deutschland:    http://www.orgelbau.com/orgelbau.htm

or even American builders of organ pipes.  Builders of organs I have
asked appear to be divided over how much of the tone depends upon the
material of the pipe.

Regards,

Robert Linnstaedt

 [ Thanks for the tip!  -- Robbie