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# [femm] Re: Hi!

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- Subject: [femm] Re: Hi!
- From: Agnaldo Souza Pereira <agnaldo@if.ufrj.br>
- Date: Mon, 6 Dec 1999 16:59:52 -0200
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    Dear David,
    my main interests are related the utilization of superconductors in magnetic
    bearings. My group has developed a methodology for simulate the total and
    partial magnetic shielding due to meissner and mixed states, using a
    commercial FEM program, without the needing of modifying that program or
    writing a new one(at the same time a spanish group has presented the same
    methodology).
    We have used this method to calculate the levitation forces in a magnetic
    bearing that was built in the electrical engineering graduate program at
    COPPE-UFRJ. Our theoretical result for the levitation height was 3.8 mm and
    the experimental result measured by the engineers was about 3.5 mm.
    Now I think we are gonna solve the Ginzburg-Landau equations of
    superconductivity, by FEM, in order to construct the B(H) curve for a
    superconductor. We have already done this curve with the method mentioned
    above, but using the Bean model.
    Another problem we'd like to deal with is the simulation of the magnetic
    response of a superconductor to a time-varying magnetic field.
    I'd like to discuss some theoretical aspects of FEM and would be very
    pleased in helping to incorporate a superconductor calculation capability
    into femm.

    For a better understanding of superconductivity I suggest you to read the
    book "Introduction to Superconductivity" by Rose-Innes and Rhoderick, and of
    course we could talk about the subject here in the list, what could bring
    benefits to other people who are interested in this subject.
    I'm sending you (in attachment)a resumed form of our work.
    An article of ours is in IEEE Transactions on Applied Superconductivity,
    june 1999,vol.9 number 2, page 964.

    Agnaldo.

    >>> Agnaldo
    >
    >In founding this mailing list, I was hoping that we'd get some of this sort
    >of discussion going. That is, understanding the sort of problems that are
    >important to other people, and hopefully learning something new in the
    >process.
    >
    >Agnaldo--I am aware of a few of the "odd" properties of superconductors, but
    >I don't understand them thoroughly enough to include them in femm. What
    >behaviors are you trying to model? Would you be interested in helping to
    >incorporate a better understanding of superconductors into femm? (This goes
    >for everyone--it might be interesting to get more manpower working on making
    >improvements and extensions to the program.)
    >
    >Cristi--Similar questions. The finite element analysis of electromagnets
    >covers a lot of territory. What particular applications are you interested
    >in, and what sorts of extensions do you envision to present techinques to
    >address the problems that you are looking at?
    >
    >Dave.
    >--
    >http://members.aol.com/dcm3c
    >
    >------------------------------------------------------------------------
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    >

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