| Summary: | 碩士 === 淡江大學 === 機械與機電工程學系碩士班 === 100 === Tamkang University MEMS group has already developed flapping wing
ornithopters (MAVs) for over 9 years. The development of the 20cm-wingspan
“Golden Snitch” has a flight endurance of more than 8 minutes. How to
modify the flapping mechanism for the new generation of MAVs is always
one of the most crucial issues. Most of the birds have their flight way mainly
in gliding and loitering, and the flapping wing stroke angle is approximately
60 to 70 degrees. The hummingbirds can hover and the flapping stroke angle
is 120 degrees. Bigger flapping stroke angle can do hovering better, but in the
past four-bar linkage has the inevitable phase lag. The phase lag is due to the
fail in mechanism symmetry and synchrony, which can cause unstable flight.
The current transmission mechanism of “Golden Snitch” has the flapping
wing stroke angle of 53 degrees, and the phase lag is less than 3 degrees.
Improvements for the prototype of using the spring to increase the stroke
angle and reduce the phase lag flapping mechanism have been demonstrated.
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