[python] Re: Stability Theory
- From: mtb@xxxxxxx
- To: python@xxxxxxxxxxxxx
- Date: Fri, 18 Feb 2005 23:29:48 -0800
Hi all,
I posted some stuff from lunchtime:
http://rjs.org/Python/clpa_m.zip
which is a CSV file of a computation of:
rearMassTrail
htRearMass
fM2Piv
wheelbase
headAngle
forkTrail
stableRange[0]
stableRange[-1]
stableRange[-1]-stableRange[0]
for reasonable and popular values for Pythons. (metric!)
Sorted in Excel by:
stableRange[-1] - stableRange[0], then
stableRange[0], then
headAngle
Where stableRange[0] is the lowest and stableRange[-1] is the highest of
the self-stable range. Output was printed only where low speed<16Km/h and
speed range>16Km/h.
79.6 (50mph) was the highest I tested for, those entries with
stableRange[-1]==79.6 are probably indefinitely high.
At the limit, it shows that theoretical self-stability is possible with
rearMassTrailhtRearMassfM2PivwheelbaseheadAngle
55.938.120.3142.241.0
forkTrailstableRange[0]stableRange[-1]stableRange[-1]-stableRange[0]
-15.26.479.673.2
Some very low speeds. Notice that there are only 4 angles that made it into
the results! [35,41,54,60]
I did not vary the weight front and rear, only the position; nor the
moments either.
It would be great if these turned out to match reality well - Juergen's new
model should be very educating.
Has anyone tried to put a bag of sand in the seat and some weight on the
cranks and then push one around a parking lot?
I'll try to work on the GUI program a bit this weekend, and maybe test on
Win98...
Ray
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