Re: chokes

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Luc by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ludev-at-videotron.ca>

Hi Ed,

When I do a tesla coil simulation in electronic workbench, for
gap I used a voltage dependent switch in Seri with a small
resistor, I set the "on" voltage at 10 kv and the "off" at 200 v
but it's a poor simulation of a gap were the resistance vary with
the current and these variation are not instantaneous because
it's take time to ionized the gas in the gap and for the gap to
recovering. What do you used?

Cheers,

Luc Benard
 
Tesla list wrote:
> 
> Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<evp-at-pacbell-dot-net>
> 
> > After twenty years as a systems simulation and forecasting engineer in the
> > pipeline industry, I am somewhat aware of the strengths and weaknesses of
> > simulator packages. They work quite well for deterministic steady state
> systems
> > and quasideterministic periodic dynamical systems and poorly for chaotic
> > dynamical systems. I also happen to believe (and it IS a belief) that
chokes
> > probably have too many disadvantages that outweigh any possible benefits. I
> > also believe that simulation applied to chaotic dynamical systems is, as
> one on
> > my numerical methods professors used to say, "The fine art of pushing a
dead
> > mouse through a maze and carefully recording what it does." Put in more
> prosaic
> > terms, the region of stability of the model is never exactly coincident
with
> > the region of stability of the system it represents. Usually,
simulations are
> > only tested against reality when they say that something will work, not
when
> > they say it won't.
> > In chaotic systems, non-linearities are as likely to cascade as they are
> to die
> > out, and this is where second-order approximations can run into trouble,
> still
> > leaving room for experimental work to verify the models.
> >
> > Matt D.
> 
>         I've done quite a bit of modeling using Electronics Work Bench
(I'm not
> a Spice whiz!) and it clearly shows the kind of chaotic behavior I've
> observed when playing with the gap width, capacitor size, and NST
> primary voltage.  Beyond that I'll leave it the experts.  I like your
> professor's quote!
> 
> Ed