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# beta-version

- To: femm@egroups.com
- Subject: beta-version
- From: Roberto Brambilla <rlbrambilla@cesi.it>
- Date: Thu, 18 May 2000 11:36:53 +0200

    Dear Dave ( & FEMM-friends )

    I have used your beta version of FEMM for some weeks and I enjoyed
    it very much. I am using big FE packages for many years
    and I know the heaviness of managing hundreds of commands,
    the inflexibility in ordering the many steps in building the
    geometry, the material properties, the mesh...
    The lightness of yor programm is truly amazing.
    Anyway I hope you will add some other (few!) useful commands
    to improve the versatility of yor FEMM.
    These are my suggestions that, I hope, require simple modifications.

    GLOBAL : a command for a custom dafault settings (units, materials etc.).
    Actually I use a template file.
    GEOMETRY : commands for inserting points and lines by keyboard. In large
    packages there are tens of this commands, most of them never used. Only two
    commands are strictly enough (but unavoidable) for the model precision :
    Point(x,y), and Line(x1,y1,x2,y2).
    RESULTS : similar Point and Line keyboard commands to read results and to
    paste values to the clip-board for exporting. Actually it is possible to
    paste only the field picture, but I need to export values to other programs
    for successive elaborations.
    Fine will be to have command to select the quantity I want the contour
    lines (as in actual xy-plot).

    And now a little remark.
    In frequency dependent problems, inserting point currents,
    I insert peak value, i.e. Io for a varying current Io exp(jwt).
    Reading the results for a selected point I find Bx, By, |B|.
    I suppose again Bx exp(jwt), By exp(jwt).
    Now your |B|=sqrt(|Bx|^2+|By|^2) and the time factor is cancelled
    by conjugation. So it may be considered an "istantaneous constant modulus".
    Usually we need the time averaged over a period so this value
    has to be divided by sqrt(2). To avoid this external operation
    I insert Ieff=Io/sqrt(2) as a point current. But in this case
    I cannot suppose Ieff exp(jwt)! So it seems to me that the output
    <|B|> = |B|/sqrt(2) and peak value insertion would be more clear.

    Hoping for future improvements,
    sincerly yours Roberto
    Roberto Brambilla
    CESI
    Via Rubattino 54
    20134 Milano
    tel +39.2.2125.875
    fax +39.2.2125.610
    rlbrambilla@cesi.it

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