Hysteresis: was Soundboard springs ...

[David Love]

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Sorry Del, it was Ron Overs actually.  I'm still not sure what =
hysteresis is exactly and why a leaf spring might have a problem =
compared to a coil spring?  Ron, if you're listening?

David Love
  ----- Original Message -----=20
  From: Delwin D Fandrich=20
  To: pianotech@ptg.org=20
  Sent: February 10, 2002 7:27 PM
  Subject: Re: Soundboard springs and hysterisis: question for Del F.


    ----- Original Message -----=20
    From: David Love=20
    To: Pianotech=20
    Sent: February 10, 2002 11:14 AM
    Subject: Soundboard springs and hysterisis: question for Del F.


    Del:

    Been reading the past posts on soundboard springs and have come to =
your comments that a leaf spring arrangement would be subject to =
"hysterisis" and would not be as effective.  Could you define what you =
mean by that term as it applies here?

    Thanks

    David love

  Did I say that? Surely not.=20

  Hysteresis would only be a problem if leaf springs of multiple layers =
were used. Then the breakaway friction between the various leaves might =
cause a response problem. (Bearing in mind that I've not actually tried =
this.) Otherwise, with a single leaf, I don't see the problem. And I =
can't think of any reason to use a multiple leaf spring arrangement for =
this application. Using a single leaf spring it should be relatively =
easy to figure out a virtually frictionless coupling between a leaf =
spring and the soundboard. Assuming, of course, that one really wanted =
to use a leaf spring.

  Del

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