Re: gEDA-user: hydraulic symbols and schematics

[John Doty <jpd@xxxxxxxxx>]

On Apr 7, 2010, at 11:54 AM, al davis wrote:

> On Wednesday 07 April 2010, Stuart Brorson wrote:
>>> 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.
> 
> If simulation means Spice to you, you are 20 years behind.

Unless you have deep pockets (and even for some who do), SPICE is today's simulator. I know you don't like this, but it's the truth.

> 
> Looking to the past ...  Simulations of things like this were 
> (and are) often done on a proprietary commercial simulator 
> "Saber", using a proprietary modeling language "Mast".  
> Matlab/Simulink is also popular (and proprietary).
> 
> Looking forward ...  Things like this can be done very well in 
> Verilog-AMS, which has a published standard, cleaner syntax, and 
> several commercial implementations.  Many users of Saber and 
> Mast are switching over.   Gnucap provides partial support for 
> Verilog-AMS, and is working on more complete support.

But that's tomorrow. 

Another approach you'll hate is to use the symbolic capabilities of a computer algebra system to analyze a design. See http://www.noqsi.com/images/pareg.nb.pdf for an example hot off the press. Unfortunately, the free software offerings don't seem to be up to this yet. Fortunately, Mathematica isn't as pricey as fancy EDA tools, and gEDA can feed it just fine.

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd@xxxxxxxxx




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