Re: [Flightgear-devel] Modifying/Contributing with a wheeled vehicle simulator

[GWMobile <geo...@mi...>]

Just to help you.
X-plane simulates springs and tires and has an open interface. People=20
have built cars for x-plane.
The roads suck though.

I think it would be great if fgear did this too.

On Fri, 30 Nov 2007 5:39 pm, STenyaK (Bruno Gonzalez) wrote:
> I'm not familiar with the suspension geometry of planes, but i *guess*
> it can be modelled as a series of "bodies", "joints", "springs" and
> "dampers", together with the tire model.
>
> Planes tires are pretty big, so they're an important part of the
> suspension process in landings too (and braking.. planes have brakes
> on their wheels too, not just reversing engines rotation + flaps,
> right?), not so much in take offs.
>
> You simply simulate a couple of bodies linked together through joints,
> and the springs and dampers must be present too (depends on the
> physics engine of choice, the spring rates and dampening values are
> part of the joints properties, or a separate "entity"). As for the
> tires, that's probably the biggest issue i'll have to deal with in my
> simulator, but i think a simple approximation will be enough for plane
> landings.
>
> I was hoping fligh gear simulated all those entity types i've
> mentioned, since that's what i could reuse for the physics of
> Motorsport. However, if it does not, then both projects are in need of
> using a third party physics engine that does it, such as ODE, Bullet,
> Physsim, etc. (unless you want to code it yourself, but i'm not a
> physicsist nor a mathematician, and i don't have enough spare time to
> learn enough, so i try to reuse physics code as much as possible.
> which is one of the reasons i'm looking into using FG).
>
> On 12/1/07, Jon S. Berndt <js...@ha...> wrote:
>>  > Hi all,
>>  >
>>  > I'm the main developer of Motorsport ( www.motorsport-sim.org ), a
>>  > wheeled vehicles simulator (aimed at racing cars, but not=20
>> necessarily
>>  > exclusively focused on that). I'm rewriting the sim from scratch,=20
>> and
>>  > while i'm at it, i'm reconsidering my choices of third party=20
>> libraries
>>  > to use.
>>  >
>>  > I've been told that FlighGear people were interested in including a
>>  > car simulation on it too, so that's why i'm seding this email :-)
>>
>>  I am particularly interested in how you model suspension/ground=20
>> reactions.
>>
>>  Jon
>>
>>
>>  Jon S. Berndt
>>  Development Coordinator
>>  JSBSim Project
>>  www.JSBSim.org
>>
>>
>>
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>
>
> --
> Saludos,
>      Bruno Gonz=E1lez
>
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