Yow-yow-yowing bass strings

[gordon stelter]

Perhaps "yowing" also encouraged by
excessive/improperly twisted strings? Loose bridge
poins?
    Just a thought. 
    Thump

--- Bill Ballard <yardbird@vermontel.net> wrote:
> At 4:34 PM -0500 1/23/03, Sarah Fox wrote:
> >Very cool.  Now I know the name. <smile>  Just to
> expand on this
> >concept, if the impulse (i.e. hammer blow)
> delivered to the string
> >has both vertical and horizontal components, and if
> the vertical and
> >horizontal components are not simple scalar
> translations of each
> >other (i.e. that the horizontal force is a fixed
> multiple of the
> >vertical force, such that they could be resolved as
> a simple,
> >unidirectional impulse at an angular direction --
> highly doubtful),
> >then the initial horizontal and vertical spectra
> would have
> >different relative representations in the different
> harmonics
> >(partials).  As a result, the resultant angle of
> vibration would
> >differ between harmonics.  (Think about it.)  Now,
> considering the
> >inharmonicity of the string, the phasing of the
> different harmonics
> >would drift.  As they drift, angle of vibration at
> any given
> >position of the string would also drift, i.e. being
> the sum of the
> >vibrational components from each harmonic, which
> arguably are set at
> >different angles in an imperfect system.  Add to
> the cocktail that
> >nonlinearities in string behavior would result in
> the gradual
> >transfer of energy from lower frequencies to their
> harmonics in
> >the *same* vibrational direction as the lower
> frequencies, with
> >those frequencies summating with the (slightly
> different frequency)
> >harmonics at different vibrational angles, thus
> causing a shift in
> >the angle of the resultant vibrational component. 
> YOW!!
> >WOW!!  This could make a person's brain bleed!
> 
> You really enjoy "writing out loud", don't you. (Me
> too, along with 
> bypassing the shellch-ecker <g>).
> 
> The story which I heard is from Barney Ricca, former
> PTG member, 
> actually a physicist at one of the Texas
> universities. At the '95 
> Albuqueque National, he was summarizing the
> conventional wisdom, 
> saying that in the initial impact, this wave form in
> the string , 
> viewed axially, would be purely vertical. This would
> last for a short 
> interval (proportional to the total sustain time)
> until the string's 
> energy would spill into the other (infinite) modes,
> to remain stable 
> in that chaotic "omni-mode".
> 
> The initial single mode is actually the prompt
> sound, that time 
> period when the string is feeding rapidly into the
> bridge. Entropy 
> compels the vibrations into a choatic mode which
> fortunately for us, 
> also extends its sustain. This latter phase is
> called the aftersound.
> 
> But what do I know, I've barely got a high school
> diploma.
> 
> Bill Ballard RPT
> NH Chapter, P.T.G.
> 
> "Woh"
>      ...........Keanu Reeves in "The Matrix"
> +++++++++++++++++++++
> _______________________________________________
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https://www.moypiano.com/resources/#archives


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