Mechanical Filtering
of Multiline Control & Power Signals
There are two superposed signals on the lines of a power kite; the control
input used to steer and the power output that results. A control-bar
separates the two signals, but this is not an optimal method for most
AWECS design.
KiteLab has a simple new method for kite control input to pass through a
surging power-lever. The attached image file (jpg format) shows the
initial "folktoy" prototype that works well.
Note the highly optimal lever set-up showing "short-stroke" downwind
displacement. A follow-on version will add a little control-bar on the
lever root, actuated by the new pulley-lines.
FairIP/CoopIP
~Dave Santos September
6, 2010
M2121
Bob,
The heart of it is a pulley spool spun by control lines rigged for
constant length whatever the power-lever does. Another set of lines on the
same spool run to a multi-line kite. Power strokes act on the spool axle,
which is also the power lever. A slider on the power lever allows its
leverage to be tuned to wind & kite. The power lever drives a cord around
a belt-drive generator capstan against a spring-retract (key-chain mech).
The sinusoidal power output is rectified by blocking diodes & smoothed by
a big capacitor (not shown).
The core mechanism is inspired by the Egyptian Bow-Drill & the rigging of
aircraft & tall-ship controls. Flying piloted power-kites is just one
aspect of the idea. An exciting super-simple use of this mechanism is for
an AoA control/power cycle that drives the lever in sustained
self-oscillation.
Anyone can build these things...
daveS
Comment and development of this topic will be occurring here.
All, send notes, drawings, and photographs!
Terms and aspects:
Related links:
Commentary is welcome:
- Could we get a description of what the various parts do, please?
Bob
- v
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