Tham khảo tài liệu 'aerial vehicles part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 33 Flapping Wings with Micro Sensors and Flexible Framework to Modify the Aerodynamic Forces of a Micro Aerial Vehicle MAV 1 Lung-Jieh Yang Tamkang University Taiwan 1. Introduction The flight of birds or insects has fascinated scholars and physicists for many centuries. Flapping motion as shown by many nature flyers is the most efficient way of flying objects whose size are smaller than or around 6 inches. In this chapter the author introduced how to use modern technology to fabricate the flapping wings for micro aerial vehicles MAVs with flexibility and smartness. The terminology of MAV defined by Defense Advanced Research Projects Agency DARPA denotes the size-limitation and the performance requirements of air vehicles Ashley 1998 . The total wingspan of a MAV is expected to be less than 15 cm the highest velocity is about 48 km hr the range of the flight mission is about 10 km and the flight endurance is about 20-120 minutes. The earliest flapping vehicle or ornithopter was made by Gustave Trouvé Chanute 1894 . No ornithopter was developed using MEMS technology until the end of the last century. A lightest flapping MAV with a total mass of only grams was made by Caltech micromachining lab in 1999-2002 Pornsin-sirirak 2001 2002 . They used titanium-alloy as the frame of flapping wings and assigned parylene a polymer material as the covering skin of the airfoil. This integrated structure can withstand extreme vibration with frequency of more than 30 Hz and it weights only gram. The Caltech MAV Micro-bat can be remotely controlled as will and the flight endurance is more than 6 minutes. Besides the work of Caltech several groups in other universities developed their flapping MAVs with different configurations and actuation principles Website http . com Website http cim projects Website http atas teams Sitti 2001 Barrett 2005 Jones 2005 . For instance TU .
