The thrust and lift of an ornithopter's membrane wings with simple flapping motion

研究成果: Article同行評審

66 引文 斯高帕斯(Scopus)

摘要

Human beings flying with the help of aircrafts of various kinds have been able to fly for about one century. Although the flapping wings of animals served as an inspiration to pioneers of human flight, we don't really understand how they work. In this study, we employ the concept of four-bar linkage to design a flapping mechanism which simulates a flapping motion of a bird. Wind tunnel tests were performed to measure the lift and thrust of the mechanical membrane flapping wing under different frequency, speed, and angle of attack. It is observed that the flexibility of the wing structure will affect the thrust and lift force due to its deformation at high flapping frequency. The lift force will increase with the increase of the flapping frequency under the corresponding flying speed. For the same flapping frequency, the flying speed can be increased by decrease of the angle of attack with the trade of loosing some lift force. An angle of attack is necessary in a simple flapping motion in order to derive a lift force. The flapping motion generates the thrust to acquire the flying speed. The flying speed and angle of attack combine to generate the lift force for flying.

原文English
頁(從 - 到)111-119
頁數9
期刊Aerospace Science and Technology
10
發行號2
DOIs
出版狀態Published - 2006 三月

All Science Journal Classification (ASJC) codes

  • 航空工程

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