On Jun 18, 2005, at 2:40 PM, Alex Tweedly wrote:
Dennis Brown wrote:
Alex,
Thanks for sharing this stack. I remember when I was a teenager
(about 3,000 years ago), I helped my dad build a king size dual
pendulum "spirograph". One pendulum ran the x axis and the other
ran the y axis. It produced very interesting patterns because
each pendulum was running a sine wave that would decay in
amplitude with time. It might be interesting to add that idea
somehow to your stack.
Uh, Dennis - I think that would require understanding the maths, as
opposed to merely translating it, which is all I have done so far :-)
So was it just two independent pendulums (pendula?), each
controlling an axis independently ? Should be worth a try ... do I
need to allow for Coriolis force :-) ?
Follow up to come - but not too soon.
Alex,
The math should just be a slider for frequency control of a sine
function multiplied by an initial amplitude value that is reduced
logarithmically with time based on a slider of friction value. You
need one for each axis x,y. It should be fun figuring out the math,
since you can see the results of what you are trying. As for the
Coriolis force... a slider for latitude perhaps 8^)
Dennis
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