On 9/5/2012 1:49 AM, scott wrote:
>> So.. guess I am trying to work this out myself after all. lol
>
> So what you're saying is the following are known:
> Position and velocity of the top of the train over time (following a
> pre-determined track at a pre-determined speed), call this point A.
> Angular speed of the platform (but that will be taken into account in
> point A, as presumably the whole track and train are rotating with the
> platform)
>
> And you want to find out how much the train swings sideways as point A
> goes around this track?
>
> I assume you're doing this at discrete time steps and just want a
> solution to the current time step based on the data from the previous step?
>
> In that case why not just model it as a point mass at B connected by a
> suitably stiff spring to point A? Keep track of the position and
> velocity of B and you can use normal numerical integration to update B
> (there will be a gravity force and a spring force towards A). In your
> graphics you can use the angle between the vertical and the line A-->B
> to draw your train.
>
> It may not be 100% physically accurate but much simpler than trying to
> work through all the maths related to dynamics in a rotating reference
> frame...
Uh, yeah, so how do you do that? lol Seriously, the closest I have come 
to differentials is a book promising to take you from basic math up to 
basic calculus, and I got lost like 3/4 of the way through it. :p But, 
yeah, it sounds good...

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