An Investigation on the Design of Wing Stiffness of Flapping Flight
Date Issued
2007
Date
2007
Author(s)
Chiu, Hung-Nien
DOI
zh-TW
Abstract
This is a study about the effect of wing stiffness on the systematic design of flapping flight, and is separated into three parts as followings.
In the first part, we constructed a test platform of flapping flight, including modification of a six-component force/moment balance, a thermal (hot-wire) anemometry and high speed camera. Then the force/ moment, integration of the flow change frequency behind the wing, and the instant deflection of the wing can be all measured.
In the second part, we referred the flexural stiffness of an insect wing and the morphology of a bat wing, and found the trend relationship between the wing stiffness and the flapping characteristics. High thrust occurred with highly-stiffened leading edge and high propulsion efficiency came up with a moderate flexural stiffness of the flapping wings. Besides, high efficiency of flapping appears when Strouhal number is large than 0.2.
Finally, we designed and built up a flapping-aerial vehicle with 70cm in span, 5.8 in aspect ratio with the weight of 136g. The model was tested and has a successful 10-second flight in air. In the wind tunnel test, we found that the thrust and power consumption decreases with increasing cruising speed. It means that the maximum power consumption is at the beginning of the flight, and in the cruise speed will approach constant with decreasing thrust.
Subjects
微飛行器
撲翼機
撓性翼
史徹赫數
仿生設計
micro aerial vehicle
ornithopter
flexible wing
Strouhal number
biomimetic
Type
thesis
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