Longitudinal Calculations

[Isaac sur Noos]

Bernhard,

Interesting comments on duplex and longitudinal wave, so does the
duplex act like a transducer, not a filter ? (or is it the same ?)


I noticed that in the minimens documentation you say  longitudinal
wave occur usually on higher than  2 m/s strokes in the bass and that
because the hammer is then allowed to hit the string while moving on
the shank (flex ?) - I understand it mean that the moving force of the
hammer exite more the longitudinal mode, is it the case ?.

I noticed on some Steinway the basses hammers  are glued with a closed
rake angle (less than 90°) should it be to avoid the apparition of the
longitudinal tho allowing for a better forte level ? (fight the shank
flex ?)

Then lighter playing gives a less round tone also is not it ?

Conducing interesting experiments with different kind of wire, what a
luxury to have all those data immediately available on the clock style
display !

Best Regards.

Isaac OLEG

-----Message d'origine-----
De : pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De la
part de Bernhard Stopper
Envoyé : lundi 15 décembre 2003 09:18
À : Pianotech
Objet : Re: Longitudinal Calculations

Joe,

ok i´m not right sure if you are making joke with me but i understand
now if
you are not familiar with metric, 1025 mm speaking length tells you
not
immediately that this is the string length of key E of a Steinway
model B
(211 centimeters long)
and the measures are really 0.95mm for core wire and 0.55mm for the
wrap
wire diameter

let´s unite on a measure we are discussing in to avoid
misunderstandings

regards

bernhard

----- Original Message -----
From: "Bernhard Stopper" <b98tu@t-online.de>
To: "Pianotech" <pianotech@ptg.org>
Sent: Monday, December 15, 2003 8:46 AM
Subject: Re: Longitudinal Calculations


> Joe,
>
> let me tell you that B-211 is the nickname for a porsche boxster,
and that
> one sounds really good, didn´t agree?
> and his longitudinal energy pulses are so ecxiting.... ;)
>
> regards
>
> bernhard
>
>
> ----- Original Message -----
> From: "Joseph Garrett" <joegarrett@earthlink.net>
> To: <pianotech@ptg.org>
> Sent: Monday, December 15, 2003 7:53 AM
> Subject: Longitudinal Calculations
>
>
> > core wire and 0.55 mm wound wire,
> >     resulting to a longitudinal match of 15/1. this key sounds
good, i
> think
> > you
> >     agree with that.
> >     Hmmmm? First of all, what the hell is a "B-211"? Secondly, how
can
one
> > have
> >     a wrap diameter less than that of the core? Are you referring
to the
> > ".055mm
> >     wound wire" as the size of the wire used to wrap on a core
wire? A
> quick
> >     calc of this makes it .37/.146 for that string. IMO that would
sound
> > like
> >     crap, given the length of approximately 40" and not knowing
what the
> > other parameters of the piano are. (I should tell you, I HATE
> >     metric. It makes absolutely no sense to me at all. And I
resent
having
> > to
> >     "convert" it!) (with strings, we are talking about a
"machinist's"
> job.
> >     Therefore use "machinist's" measurements, please.)
> >     Joe Garrett, RPT, (Oregon)
> >     Captain, Tool Police
> >     Squares Are I
> >     ----- Original Message -----
> >
> > Joe Garrett, RPT, (Oregon)
> > Captain, Tool Police
> > Squares Are I
> >
> >
> > _______________________________________________
> > pianotech list info: https://www.moypiano.com/resources/#archives
>
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives

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