Measuring Sustain and Power: was The Steinway Bell Patent

[Mike and Jane Spalding]

Roger,

Thanks for sharing, sounds like an interesting study.  I hope I'm still around when you publish.  Good luck.

Mike

----- Original Message ----- 
From: Baldwin Yamaha Piano Centre <baldwin@mta-01.sk.sympatico.ca>
To: Mike and Jane Spalding <mjbkspal@execpc.com>; Pianotech <pianotech@ptg.org>
Sent: Tuesday, September 17, 2002 5:20 PM
Subject: Re: Measuring Sustain and Power: was The Steinway Bell Patent


> Hi Mike,
>                      I have developed a key thumper, that has variable 
> height, and variable mass.  This gives me control of the acceleration.   I 
> am tying the partial amplitude and sustain time, to force, and 
> acceleration.  With some promising preliminary results.
> 
>    Calculating the RMS values of each partial, and then integrating the 
> series, is starting to also show some promise.
> 
>    Research is in it's early stages. And results at this time are 
> confidential.  But I can say that results are re producible to within 15% 
> margin of error.
>    The key was getting consistent mass and acceleration of the key 
> thumper.   Affectionately nicked named the 'Jolly Thumper'
>    There are so many variables to the harmonic series, that is associated 
> with, dwell time, energy transfer, etc.   I think I will be a very old man 
> before I figure it out.
> 
> Regards Roger
> 
> 
> At 04:46 PM 9/17/02 -0500, you wrote:
> >Hi Roger,
> >
> >My fault, I guess, for phrasing the question in Yes/No format.  Can you 
> >elaborate?  Were the results repeatable?  Did they make sense?  Were they 
> >useful?  Please tell us your story.
> >
> >thanks
> >
> >Mike
> >
> >----- Original Message -----
> >From: Baldwin Yamaha Piano Centre <baldwin@mta-01.sk.sympatico.ca>
> >To: Mike and Jane Spalding <mjbkspal@execpc.com>; Pianotech 
> ><pianotech@ptg.org>
> >Sent: Tuesday, September 17, 2002 3:46 PM
> >Subject: Re: Measuring Sustain and Power: was The Steinway Bell Patent
> >
> >
> > > At 12:26 PM 9/17/02 -0500, you wrote:
> > > >Dave,
> > > >
> > > >I've never done this, nor heard of anyone else, but it occurs to me that
> > > >some combination of a calibrated hammer blow (maybe the tuning stability
> > > >test blow of 8 oz. dropped from 6 inches?), and one of the ETD's that
> > > >measure volume and sustain, such as RCT's Pianolizer or TuneLab, might
> > > >work.  Anyone ever do this?
> > >
> > > Mike
> > > Yes.
> > > Roger
> > >
> > >
> > >
> >
> >_______________________________________________
> >pianotech list info: https://www.moypiano.com/resources/#archives
> 
> Roger
> 
> 
>