Re: Suspension losses

On Thu, 2 Jan 2025 10:06:08 -0600, AMuzi <am@yellowjersey.org> wrote:

I take from that, you think the actual impact/height
change/velocity change etc from various irregular surfaces
can be quantified for any given random gravel (or road)
experience and used to compare efficiency for other iterations.

This is close, but not quite what you're asking.

"Energy Harvesting from Bicycle Vibrations by Means of Tuned
Piezoelectric Generators"
<https://www.mdpi.com/2079-9292/9/9/1377>
<https://mdpi-res.com/d_attachment/electronics/electronics-09-01377/article_deploy/electronics-09-01377-v2.pdf?version=1598515211>

On PDF page 14, it proclaims:

"8. Prediction of Generated Power
The electrical power harvested by a piezo-harvester is very low (in
the order of a few mW), so highly-efficient power management units
(PMU) have to be used for energy conversion. The output voltage of the
piezo-harvester is a random signal with a main harmonic component at
the resonance vibration frequency of the cantilever. On the other
hand, electronic loads (such as a battery for energy storage and/or a
portable device which can be mounted on a bicycle) are typically fed
by DC voltage; therefore, interface electronic circuits between the
piezo-harvester and the load are made up by a rectifier (for AC to DC
voltage conversion), an electrolytic capacitor for voltage leveling
and energy storage, and DC-DC converter for impedance matching with
the electronic load resistance."

Page 17 has a table of generated power at various speeds. 

Of course it's possible to optimize the bicycle design, material
(tire) selection, road surface profile, etc to produce the most power
output.  Presumably, the generated electric power will be used to
power an electric and mechanical doping system.  The problem is that
when you're starting with milliwatts, it's a long way to go before
sufficient power can be harvested to make a difference in a race or on
a ride.

--
Jeff Liebermann                 jeffl@cruzio.com
PO Box 272      http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann      AE6KS    831-336-2558