Hottest 6/Hottest 6 (1996)(PDSoft)[!].iso/software/videoutils/a-g/ami2d/readme

Text File | 1978-11-24 | 5KB | 121 lines

This is release 1.0 of Ami2D and is the first official release.  Therefore,
any  comments and or suggestions would be appreciated.

    Russell Leighton
    [e-mail] (valid through Dec 1993)

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REQUIREMENTS

The minimum system requirements for running the codes are:  A 68020
processor or better, 68881 floating point processor or better, AmigaDOS
2.04 or higher, ARexx and at least 2 megabytes of free RAM.  Optionally, a
hard drive and lots more memory are highly desirable.  Additional software
to enhance the operation of the codes is also highly recommended.  This
includes WShell (a commercial replacement for the AmigaDOS shell), GNUPlot
(a freely-distributable general purpose plot package), AmigaGuide (a
freely-distributable hypertext utility from Commodore), CyberCron (a
freely-distributable task scheduler and pseudo-queue manager), and
PowerSnap (a freely-distributable utility that allows cutting and pasting
of text.) None of these programs are required, but definitely increase the
interactivity and flexibility of Ami2D.  Check for the latest versions of
the freely-distributable programs on the latest Fred Fish disks or on
AMINET.

I have compiled a version that does not require a 68020 or better or the
math coprocessor, but found that run times were not acceptable (even on my
A3000 performance was on average 20% of the performance for the 68020/68881
optimized version.)  However, if enough people feel they must have this
version I will post it.

INSTALLATION

To install this release just copy the Ami2D directory (keeping names and
contents intact) to the desired location.  Of course, the programs will run
fine from a floppy disk.  I recommend that you copy the rexx scripts in
ami2d:rexx to your rexx:  directory (except for rexxcon.rexx and
rexxbar.rexx ).  If you do not have rexxarplib.library and/or
rexxmathlib.library then copy them from ami2d:libs to your libs:
directory.

Most of these codes are heavily dependant on ARexx, therefore, make sure
that the ARexx interpreter is running.  I recommend including the following
line in your s:user-startup file:

    rexxmast >NIL:

This will insure that ARexx is always available (it is a good idea to do
this as a lot of applications require ARexx).

For a quick test to see if everything is functional try double clicking on
the ami2d icon.  A screen should appear with two windows, one with buttons
the other with a prompt.  Type the following in the window with the prompt.

    -> !cd ami2d:test
    -> !beam1

Now click on the lin2d button and wait for the model to be replotted (which
indicates that the job finished.)  Then type the following in the console.

    -> fill
    -> fill deform 20

If you have a few spare megabytes (at least 2) you can try srm4 instead of
beam1.  However, you will have to run the model through Opt2D (unless you
have at least 4 megabytes to spare.)  To do this just click on the opt2d
button before running lin2d as above.  In a few seconds the model will be
replotted and should be optimized (watch how the nodes are plotted to get
an idea how the optimizer works.)  Run Lin2D as above.  While Lin2D is
running you can check on the status by typing the following.

    -> !solstat

On a 25Mhz A3000 this problem will take around 2 minutes to run (longer if
you did not run the model through the optimizer.) Be sure to save the model
if you want to keep the results.  You can also do fill plots with the
elements colored according to result level.  For this problem type the
following.

    -> post sigd
    -> fill result max 0 84

This will result in a fill plot of the maximum deviatoric stress within
each element.  Other stress components and combinations are defined in
ami2d:rexx/init.rexx which is read in by the ami2d.rexx script.  Of course
you can define your own.

To try the nonlinear solver, Nln2D, try ami2d:test/rotate.rexx.  This model
is a simple beam pinned at one corner with displacements applied to the
opposite corner such that the resulting displacements should result in a
pure rotation.  The solution procedure is iterative, therefore, the model
must be run through the solver several times to converge on the desired
solution.  The first run through the solver will give the linear solution
which shows the gross error that can result if a linear solution procedure
is used when large displacements are expected.

To  quit  out of the session type stop in the window.

COMMENTS ?

This initial release is a freeware version and can be freely distributed
(provided all files in the original distribution remain intact), however, I
would appreciate any comments/suggestions on the use of these codes.  If
you find a bug then please give me the details necessary to duplicate the
bug (such as an ARexx script).  This will insure greater likelyhood that
the bug will be squashed.  My e-mail address is given above (valid through
Dec 1993.)

Possible future enhancements include:

    - Advanced materials
        - composite materials (orthotropic, specially orthotropic laminae,
          laminates, etc.)
        - near incompressible, incompressible material behavior
        - viscoelastic (time-temperature dependant) material
        - nonlinear material behavior (rubber elasticity, plasticity, etc.)
    - Enhanced interface
    - Advanced modeler
    - Enhanced postprocessing