[python] Re: A Bicycle Can Be Self-Stable Without Gyroscopic or Caster Effects
- From: mtb@xxxxxxx
- To: python@xxxxxxxxxxxxx
- Date: Mon, 18 Apr 2011 10:12:32 -0700
At 11:24 AM 4/17/2011, you wrote:
Help me - I am trapped in a time
loop ...
Exactly. I've never written anything for that
though...
The only "new" thing was noting the (theoretical) adverse
effect of wheel mass. Has anyone real experience with very heavy wheels?
Or tried trying 3 lb scuba weights to their wheels?
On 17.04.2011 20:04, Vi
Vuong wrote:
Hi Ray,
Thanks for sharing the program. Is there a way to automatically
grind through the 18 parameter space, and save the
output?
not at this point
I think we need to find stable
speed between 4-8mph to run along with the experimental bike.
Not necessarily - unstable low speeds can easily be controlled with
technique; it is also very difficult to get good low speed self-stability
except in the classic safety design.
It is at higher speed that this type of stability feels better, my SWB
bent suffers from this, but it is also due to wiggle in the full
suspension design,
http://www.rjs.org/recumbents/images//SWB/side.jpg
a parameter nearly impossible to model.
The console output
velo A
B
C
D
E #6
#7
m/k 10**8 10**9
10**9 10**9 10**10 10**20 10**26
suggests that when colunm #6 and #7 both go positive then we have
stability, and can be used to search the parameter
space.
correct, that it the basis for the colored bar on
the right
The problem, as Jürgen noted, is that there isn't any good correlation
between self-stability and ride-ability. As an extreme example, a
programmatic method cannot analyze a unicycle because ride-ability is
almost entirely a human control problem, height and wheel diameter are
small issues.
The virtual pivot idea has severe design/use issues, and a mechanical
device to create -K would be extremely complicated as it must change with
lean angle as well.
Our legs can do it easily with practice, however.
With the specific python design, the only thing I can see being of some
use to the group is to use some -K in the GUI, and test each design in
Jürgen's database with the other dimensional factors and seeing if there
is any correlation with ride reports at all...
Ray
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