Re: gEDA-user: hydraulic symbols and schematics

[Stuart Brorson <sdb@xxxxxxxxxx>]

Hi --

> Obviously gschem is intended for electric circuits, but has anyone
> used it for hydraulic schematics?  The hydraulics industry has defined
> a fairly rich schematic language [1][2] for describing hydraulic and
> pneumatic systems.
>
> I didn't find a gschem hydraulic symbol library, so I'm attempting to
> build one.  My first stumbling block is the use of filled and
> non-filled triangles, which differentiate hydraulic pumps from
> pneumatic compressors.  Is it possible to draw filled triangles or
> polygons with gschem?

I don't think vanilla gschem currently supports filled regions.  But
this is a frequently requested feature, and the folks in Cambridge may
have coded up a solution based upon the whizzy graphic work they have
done.

> Do you foresee any other difficulties?  ... aside from simulating a
> hydraulic circuit with spice or generating a layout.

Actually, my first thought was:  What kinds of simulations (if any)
does one do in hydraulics?  Are there any standard simulators?  If so,
generating a netlist to feed to such a simulator might be an
interesting hobby project.

> (BTW at Eaton, we have a history of bending EDA tools for our
> purposes.  We used GTKWave to view and analyze vehicle data in
> realtime.)

Awesome!  How did you get the real time info into GTKWave?  IIRC, it
only reads .vsd (and other simulation) files.

Stuart


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