Design of tworotored UAV Cyclocopter（tworotored无人机Cyclocopter设计）.pdfVIP

Design of two-rotored UAV Cyclocopter 1* 2 3 4 5 Choong Hee Lee , Seung Yong Min , Youn Seong Kim , Jong Won Lee and Seung Jo Kim 1,2,3School of Mechanical and Aerospace Engineering, Seoul National University Seoul 151-742, South Korea 4,5Korea Aerospace Research Institute, Daejeon 305-333, South Korea A cyclocopter or cyclogyro is a type of rotorcraft that is operated by a cycloidal blade system with several blades rotating about a horizontal axis that lies perpendicular to the flight direction [1, 2]. Figure 1 shows a cycloidal blade system with a typical pitch motion of a blade rotating on the orbit. The pitch angle of the blade is in cyclic varying motion. Therefore, the direction of the thrust is roughly the position of maximum pitch angle, or φ=90deg. Owing to the periodic pitch angle variation, a cycloidal blade system has a unique ability that it can change direction and magnitude of the thrust force almost immediately. Moreover, this characteristic enables the system to capable of VTOL maneuver and a forward flight. The cycloidal blade system was studied at NACA, University of Washington, etc., from 1920’s to 1940’s [3]. In 1998, Bosch Aerospace carried out a ground test using a six-bladed cycloidal rotor [4]. Recently, University of Maryland developed a MAV cyclocopter and performed flight tests [5]. This year, in October 2012, our laboratory conducted a hovering test using a four-rotored MAV cyclocopter [6]. The rotors of the cyclocopter rotate at constant speed and the blade pitch angles are controlled to generate thrust