---------------------- multipart/mixed attachment Del, I wonder if you might help me understand this. You say, "And a=20 good example of why soundboard cutoff bars can (should) be used to some=20 advantage." In the views I saw on the web page there seemed to be quite a=20 bit of movement in the area normally eliminated by a cutoff bar. If there=20 is that much movement is that not contributing to what we hear rather than= =20 detracting from it? As I type and look back at the pictures in another=20 window I'm tempted to rationalize that while one part of the board,=20 specifically that part in question, is on the down part of a wave the rest= =20 of the board is up and visa versa. Is this what you wish to eliminate with= =20 the cutoff bar so that the board acts as a whole instead of in separate=20 parts? It would be interesting to see what the board would do using this=20 modal analysis with a cutoff bar installed. This brings me to another question. In all of the examples I've=20 seen of pictures with cutoff bars installed, all seem to be a great deal=20 smaller in size than the corresponding inner rim section they are=20 replacing. I understand that they are epoxied into the existing inner rim=20 and doweled as well. I further understand, I think, that the cutoff bar is= =20 attached to any support beams over which it passes. Do the combinations of= =20 these items make it unnecessary that it be of similar dimension as the=20 inner rim? Greg At 03:09 AM 5/9/2003, you wrote: >----- Original Message ----- >From: "Alan Forsyth" <alanforsyth@fortune4.fsnet.co.uk> >To: "Pianotech" <pianotech@ptg.org> >Sent: May 08, 2003 3:27 PM >Subject: Modal Analysis > > > > >Del, > > Can this type of modal experiment be reproduced? and if so,= how? > > Greg Newell> > > > > Hi guys > > Thought you might like to visit this website which explains modal >analysis. > > I found it quite interesting. > > > > http://www.speech.kth.se/music/5_lectures/wogram/modal.html > > Regards > > Alan Forsyth > > > >And a good example of why soundboard cutoff bars can (should) be used to >some advantage. Especially with a board as large as the Bosendorfer. > >Now It would interesting to see what the vibration modes would be like with >the piano strung. > >Del > >_______________________________________________ >pianotech list info: https://www.moypiano.com/resources/#archives Greg Newell Greg's piano Fort=E9 mailto:gnewell@ameritech.net=20 ---------------------- multipart/mixed attachment--
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