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# Updated femm30 beta

- To: femm@egroups.com
- Subject: Updated femm30 beta
- From: David Meeker <dmeeker@foster-miller.com>
- Date: Tue, 24 Oct 2000 14:02:30 -0400
- Organization: Foster-Miller, Inc.

    All--

    I've uploaded an updated version of femm 3.0 beta to the files section
    of egroups at:
    http://www.egroups.com/files/femm/

    For those who are interested in this sort of thing, I've also uploaded
    the full source to the 3.0 version at the same place. You'll need
    Microsoft Visual C++ version 4 or later if you are interested in
    compiling it on your own. The 3.0 version executable and source are
    released under the Aladdin Free Public License. The short version of
    AFPL is use the source and program, modify it and/or redistribute it if
    you want, but don't sell the program and don't sue the author.

    Anyhow, this updated version has the following changes:

    1) It was brought to my attention that the way that the program
    computed stored energy worked right only for linear materials. It has
    been modified to give the correct results for energy with nonlinear
    materials. I have also added the calculation of coenergy, which is
    useful for determining forces via energy methods in nonlinear problems.

    2) I've modified the flux line plots so that the range over which the
    lines are plotted is user-specifiable. This one has been a frequent
    request.

    3) I've added in a new property called "Solver Precision", that you
    define in the same dialog as frequency and length units. The default,
    1.e-8, was the limit hard-coded into previous version of femm. You can
    decrease this down as far as 1.e-16 if you feel like it. This number
    sort of specifies the number of significant digits in the solution to
    the magnetic vector potential, A. For example, roughly 1.e-08
    corresponds to 8 digits, 1.e-16 to 16 digits. Some people had asked for
    this ability.

    4) The methods for interpolating potential and calculating flux density
    in axisymmetric problems were modified. The modifications yields a few
    more decimal places of accuracy in some specialized problems. The
    answers to most axisymmetric problems won't be noticably affected by
    these changes.

    Dave.

    begin:vcard
    n:Meeker;David
    tel;fax:781-890-3489
    tel;work:781-684-4070
    x-mozilla-html:TRUE
    url:http://members.aol.com/dcm3c
    org:Foster-Miller, Inc.;Electrical and Electronic Systems Group
    version:2.1
    email;internet:dmeeker@foster-miller.com
    title:Senior Engineer
    adr;quoted-printable:;;350 Second Avenue=0D=0A;Waltham;MA;02451-1196;USA
    fn:David Meeker, Ph.D.
    end:vcard

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