This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment ----- Original Message -----=20 From: Richard Brekne=20 To: pianotech@ptg.org=20 Sent: December 03, 2001 12:04 PM Subject: Re: Negative bearing (long) Delwin D Fandrich wrote:=20 =20 The understanding of soundboard function has moved a bit beyond the = purely=20 empirical--even beyond 90% empirical--though certainly not to the = stage of=20 pure science either. Still, techniques such as modal analysis have = enabled=20 the study of soundboard function at a level not even dreamed of even = thirty=20 or forty years ago. It is my hope that before I pass from the scene = that=20 this understanding will be still some closer to scientific and much = less=20 reliant on the empirical.=20 Del Been reading and weeding through and find much that is interesting, = but this comment caught my eye and I must admit is confusing. I wrote = about modal analysis a year and a half back and you came out and said it = was basically useless in designing soundboards, since the conditions for = measurement are different then the conditions for full strung, and if = done full strung well the deed is already done so to speak... further = you pointed out then that you meant that there was no reliable way of = forcasting said changes.=20 =20 From the fall of 1999 where we were in a disscussion about impedance = matching, and the usefullness of modal analysis came up I submit the = following three posts.=20 Pease go back and read what I wrote, to wit: "One of the problems I have with most of the testing I have seen on = the piano soundboard is that it was done on an unloaded board and is, = therefore, largely meaningless." There is no rule that states modal analysis cannot be done with good = results on a loaded board, complete with strings. It's just more = difficult. Tests with unloaded boards are, in my opinion, largely = meaningless. It becomes something else when done in a real world setting = complete with strings and loading. Again, my experience is some limited. = I have only used the technique to analyze one soundboard assembly and it = did lead to some considered changes in the ribbing which--again, in my = opinion--improved the performance of the piano involved.=20 Del ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/02/82/16/ce/attachment.htm ---------------------- multipart/alternative attachment--
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