felt

FELT(1fe)                   Finite Element Package                   FELT(1fe)



NAME
       felt - command line based Finite ELemenT engine

SYNOPSIS
       felt [-help] [-version] [-debug] [-preview] [-summary] [-plot] [+table]
       [-transfer] [-orthonormal] [-eigen] [-renumber] [-matrices] [-graphics
       filename] [-nocpp] [-cpp filename] [-Dname[=value]] [-Uname]
       [-Idirectory] [filename]

DESCRIPTION
       Felt is a command line based finite element engine which reads a
       felt(4fe) file and writes the results to standard output.  If no
       filename is given then the standard input is used.  Any syntactic or
       semantic errors are reported to standard error.  A complete description
       of the mathematics can be found in the user's guide.

OPTIONS
       Felt accepts the following options:

       -version
            Write the current version number and exit.

       -help
            Write a message describing valid command line options to standard
            error and exit.

       -debug
            Write the processed file to standard output in the form of a valid
            input file.

       -preview
            Write an ASCII rendering of the problem geometry.

       -summary
            Write a material summary describing the total length, area, and
            volume of each material used to standard output.

       -plot
            Include a time-displacement plot in the output of a transient
            analysis problem.

       +table
            Do not output a table of times vs. displacements in the output of
            a transient analysis problem.  Simple tabular output is the
            default.

       -transfer
            Only compute transfer functions for spectral analysis (stop
            calculations before output spectra are computed).

       -eigen
            Only perform the eigenvalue calculations (natural frequencies and
            mode shapes) in modal analysis.

       -orthonormal
            Use orthonormal mode shapes when calculating modal matrices
            (normalize the eigenvectors such that the modal mass matrix is the
            identity matrix).

       -renumber
            Make an attempt at optimally renumbering the nodes in order to
            minimize the storage requirements of the stiffness (and mass and
            damping) matrices.  This option will invoke a GPS/Gibbs-King
            renumbering algorithm.  For small problems the extra overhead of
            this algorithm is probably not worth the effort.  For large
            problems (> 100 nodes or so) the savings in both memory and
            overall execution time can be quite significant however.

       -matrices
            Print the global (stiffness, mass, damping) matrices that are
            appropriate to the analysis type for this problem.

       -graphics filename
            Create filename as a graphics file in gnuplot(1) format for
            visualizing the structure.  This option is used by xfelt(1fe).

       -nocpp
            Do not use a preprocessor on the input file.

       -cpp filename
            Use filename as a preprocessor on the input file.  The default
            preprocessor is "/lib/cpp".  Any preprocssor which understands the
            -D, -U, and -I options can be used as these options are passed to
            the preprocessor.

AUTHOR
       Felt was developed by Jason I. Gobat (jgobat@mit.edu) and Darren C.
       Atkinson (atkinson@ucsd.edu).

SEE ALSO
       corduroy(1fe), gnuplot(1), velvet(1fe), burlap(1fe), felt(4fe).



Version 3.00                        6/02/95                          FELT(1fe)