rec.autos.simulators

Sim Experiment-- Engines in real time

J. Todd Wass

Sim Experiment-- Engines in real time

by J. Todd Wass » Sun, 20 Apr 2003 07:44:59


>> Hmm..  Hadn't thought of engine vibration.  Not really sure how to do it
>off
>> the top of my head.  This is pretty CPU hungry as it is and will get a lot
>> worse with the whole exhaust system in there, but I'll think about it.  

>You could maybe get some modelling inspiration from SAE Technical Paper
>2000-01-0560: "Torque Estimation and Misfire Detection using Block
>Angular Acceleration", by Jeffrey K. Ball et al.

>/Stefan Larsson

Excellent paper!  Thanks a lot.  I went ahead and threw in some random
vibration after reading it (yes, it sparked some ideas and inspiration; quite a
lot actually :-D).  I'm running this on my laptop both with and without
mediocre quality headphones, so haven't heard what it sounds like on actual
speakers.  Is there any bass to this at all?  

I think I got rid of the static problem.  Seems that the exhaust valves were
not closing correctly.  They sort of were and were not at the same time ;-)

http://www.racesimcentral.net/~18.EXE

Todd Wasson
Racing Software
http://www.racesimcentral.net/
My car sim
http://www.racesimcentral.net/

Stefan Larsso

Sim Experiment-- Engines in real time

by Stefan Larsso » Wed, 23 Apr 2003 05:23:03


> Excellent paper!  Thanks a lot.  I went ahead and threw in some random
> vibration after reading it (yes, it sparked some ideas and inspiration; quite a
> lot actually :-D).  I'm running this on my laptop both with and without
> mediocre quality headphones, so haven't heard what it sounds like on actual
> speakers.  Is there any bass to this at all?  

Nice to be able to help!

It gets better and better!  It is starting to sound very convincing,
but still a bit synthetic.  I guess you need some "slower" dynamics
(variations) incorporated too?  Keep up the good work!

--
/S

/* http://www.s2.chalmers.se/~last */
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J. Todd Wass

Sim Experiment-- Engines in real time

by J. Todd Wass » Wed, 23 Apr 2003 07:26:10

Thanks :-)  This one is probably the worst one yet.  Indeed, at higher rpm
things don't sound as good.  But the vibration stuff has got me thinking.  

I tried coding a rudimentary exhaust system last night, but really blew it.
Will have to rethink that one again.

Todd Wasson
Racing Software
http://PerformanceSimulations.com
My car sim
http://performancesimulations.com/scnshot4.htm


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