From: boris petkovic
Date: Tue, 19 Dec 2000 07:23:43 -0800 (PST)
Subject: Re: [TSSP] Final solution...great chance for it
> > 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/
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.