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Re: Racing Spark Prediction

Original poster: dest <dest@xxxxxxxxxxxxx>


> Original poster: Paul Nicholson <paul@xxxxxxxxxxxxxxxxxxx>

>  > [racing arcs]

> I posted a list of some possible causes, a while ago now,
>   http://www.pupman.com/listarchives/2002/July/msg00429.html

very informative, even starting a little sooner - from your post here:


and from this thread it can be clearly seen, that some people have
never learned what did you tell them, no matter how long or how many
other people told the same to them.
it seems than you guys have had much more fun in this millennium
(comparing with previous one), so i need read several times faster
than i do now. have you ever think about some more or less restricted
form of this list, such that where guys like me can`t post, only read?
coz when guy like me are tryin to read archives, he quickly finds that
starting from some point about 95% of all posts had no new information
for him, and even just skipping those posts can take a year or two of
his life (we all have other things to do such as job and etc).

> My hunch is that overtones have something to do with it

then how about "folded resonator" concept? can`t find reference right
now, but will do it if needed.

> At any instant, the secondary voltage distribution is the sum
> of the primary induction and the secondary self induction

> However, at times during the beat, for example the first quarter-
> cycle of the primary ringdown, the secondary must withstand the
> onslaught of the induction from the full primary current, and
> this has the distribution described by someone earlier - one
> which mimics closely the primary induction profile.

> The software library GeoTC

>   http://www.abelian.demon.co.uk/tssp/geotc/

> is capable of calculating the two contributions to secondary
> voltage - the self induced quarter wave profile, and the primary
> induced voltage profile, although I think this has not been fully
> implemented.

"Resonance frequency and V/I profile calculations are made by using
equations 6.3 and 6.4 from pn2511, starting with the capacitance and
inductance matrices obtained above."

6.3  dV(x)/dx= omega * integral (0-h) [ M(x,y) * I(y)dy ]

when i look into javascript code of "compute_F()" i see that you
compute two-dimensional array M[n][m], so you can calculate primary
induced voltage profile separately from self induced one, but when
you compute voltage profile in "function xx_construct_A()", i see

// Insert entries for equ 6.3
for( var n=1; n<=N; n++)
   A[n][n] -= 1;
   if( n > 1) A[n][n-1] += 1;

   for( var m=1; m<=N; m++)
      xx_enter_Icoeff( N, A[n], m, omega * M[n-1][m-1]);

so at the end you don`t compute two profiles separately, but compute
single "average" value of sec voltage instead?
: (

"I suppose racing arcs will never be eliminated because folk will just
wind up those variacs until the problem reappears again in some form
or another."