CoolIP index Most recent edit: Thursday October 10, 2013 SearchSite
* See legal note below.
Modulating Kite Dutch-Roll Instability for
Optimal Pumping Force
As is well known, a power kite can be "staked-out" crosswind to reduce yaw instability*. An inventive leap is that varying the set geometry (and resultant altitude and crosswind distances) can make the emergent pumping force highly controllable (including maximizing dynamic-stability) for AWES use. By basic rigging means of pulleys and reels, one can set a staked-out kite to passively oscillate in a desired power-generating mode. Variations in wind and load can be better matched.
When a kite is flown from two crosswind anchors set far apart, an adjustable pulley bridle set low between the two lines effectively modulates yaw instability. Drawing the two sides together aloft causes the emergent oscillation to increase in amplitude (at a somewhat slowed frequency). Normal mode frequency is closely modulated by altering the side line lengths. Shorter lengths host higher-frequency modes.
A pilot-lifter kite set above the oscillating kite allows more aggressive power extraction by helping keep high-performance chaos risk within critical bounds, as a further modulation control. These concepts can be implemented in high unit-count crosslinked-arrays as well.
* AKA "Dutch Roll", which involves both roll and yaw components. Note also that a "dancing kite" with relaxed lateral stability is desired (ie. no tail)
Comment and development of this topic will be occurring here.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Support our editor.
(Legal Note: Open AWE CC sharing and claims rest on "artist's moral rights", under the Berne Convention.
Inventing is a true creative Art, by long tradition.
The intent in Open AWE is to make the widely emerging new form of CC IP voluntarily accepted and fairly valued,
as AWE's professional best-practice standard. Comments invited.)
Note: coolIP is hereby defined as a Creative-Commons Unported NonCommercial
so now we are integrated with the latest standard cooperative IP model, but "coolIP" remains a nice shorthand.