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 > > __________________________________________________ > Do You Yahoo!? > Yahoo! Shopping - Thousands of Stores. Millions of Products. > http://shopping.yahoo.com/ -- Bert Hickman Stoneridge Engineering Email: bert.hickman@aquila.net Web Site: http://www.teslamania.com
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.