TSSP: List Archives

From: Bert Hickman
Date: Tue, 19 Dec 2000 10:06:43 -0600
Subject: Re: [TSSP] Final solution...great chance for it

Boris,

Sounds like Professor Bodlovic has done some very solid work that's
directly applicable - good luck at your meeting!! 

-- Bert --

boris petkovic wrote:
> 
> > > Let me formulate the problem once more:
> > > We have symetrical and symetricaly placed winding
> > > structure aproximately 100-1000 turns ,excited by
> > wave
> > > source at its begginig (or end),and want to know
> > > transient processes from the first moment on,for
> > every
> > > point of the winding given with respect to
> > > time,voltage gradients,reso. freqs etc.?
> >
> > That about sums up the problem, although I'm content
> > with
> > a steady state analysis - I feel the full time
> > dependent
> > solution requires far too much computational effort.
> -----
> When I first talked to dr.Bodlovic,I asked how did he
> approached to the winding network.
> He stopped me in the middle of my sentence when I
> mentioned network-circuit theory saying that it was
> brutte-force ,ie a primitive method,and that with
> "only" 50 parts of such modelling I would have big
> problems with the time of computing (definitely,that
> is true).
> Furtherly ,I replied ,what I knew, that well  circuit
> theory is the simplier case of complicated Maxwell
> theory and could be just of help and expressed an
> opinion that direct application of the field theory
> will  result in even larger computional times.
> He also stopped me,saying that is true in general
> case,but not in some symetrical space geometry
> cases where dissipation factors could be treated like
> they are small.
> He said that at first sight his solution had some
> similaraty with a theory of a waveguide,but only at
> first  sight and includes some special math. functions
> developed in 70s,that he used for representation of
> wave dispersion along the winding.
> Having just one little limit ,and that would be if one
> takes constant or linear function of dissplacement
> currents conductivity along the winding (speaking in
> terms of circuit theory :the Cexternal distribution)
> ,one of his associates wrote a computer programm which
> took just a few minutes to finish all  calcs at PC 486
> processor.
> The Results of simulation were compared with test msms
> on real models,and were successful.
> Bodlovic said his work relied much more on math
> analitics than on using computer aproximations.
> Naturally,it is clear than,why it requires relatively
> short
> computing time.
> ------
> 
> >
> > > Many people,including me, thought this could be
> > done
> > > by modeling it in terms of circuit theory  ,ie.by
> > > breaking the winding into many  parts mutualy
> > > ,inductively and capacitively coupled and trying
> > to
> > > find solutions of such network from the set of
> > > integro-differential equations,using gaussian
> > > elemination and operational calcs.
> >
> > > Paul ,is this way how you and Terry are looking
> > for
> > > the solution of the
> > > the winding?
> >
> > That describes the tssp simulator very accurately
> > and concisely.
> ----
> And  is good, perhaps, for the diggesstion of
> CRAY-like systems   ,not for normal machines.
> -----
> 
> 
> >
> > > Maybe,this post of mine comes premature,and I'm
> > too
> > > excited to think clear now,but many things tell me
> > > this mister has "a real stuff" for us.
> > > I arranged to meet him tommorow.
> > > Can't promise anything but hope the best.
> >
> > Marvelous. Maybe you can scan some papers?
> ----
> I will try my best
> ---
> 
>  The two
> > approaches,
> > ie direct solution of Maxwell and our finite network
> > approximation
> > should be equivalent and reveal the same features,
> > ie current
> > profiles, etc. Ask if Dr Bodlovic has noticed the
> > elevated current
> > maximum in the grounded base configuration.
> -----
> I mentioned him that his work could be usefull for
> Tesla transformer .
> It appeared he didn' t heard for such.(!)
> -----
> >
> > The only attempts at the Maxwell solution I have
> > seen have been
> > for helical structures typical of the kind used for
> > antenna
> > radiators. Does Dr Bodlovic exploit the
> > simplifications to
> > Maxwell's equations which are valid when the free
> > space wavelength
> > is much greater than the coil dimensions?
> ----
> Don't know,I guess he did.
> He mentioned that Japaneses used his work as the base
> for the investigation of proceses when lightning surge
> penetrates comercial transformer winding.
> I'm going to visit him in 2 hours.I hope he will bring
> concrete material to show it to me and allow copying
> it.
> 
> Regards,
> Boris
> 
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-- 
Bert Hickman
Stoneridge Engineering
Email:    bert.hickman@aquila.net
Web Site: http://www.teslamania.com



Maintainer Paul Nicholson, paul@abelian.demon.co.uk.