Development of a Flapping Wing Mechanism

Only available on StudyMode
  • Topic: Lift, Wing design, Aerodynamics
  • Pages : 27 (6663 words )
  • Download(s) : 152
  • Published : January 31, 2013
Open Document
Text Preview
Oliver Breitenstein

Development of a Flapping Wing Mechanism

Semester Project
Autonomous Systems Lab (ASL) Swiss Federal Institute of Technology (ETH) Zurich

Supervision Dr. Samir Bouabdallah, Stefan Leutenegger and Prof. Dr. Roland Siegwart

Spring Semester 2009

Contents
Abstract Acknowledgements 1 Introduction 2 Review 2.1 Aerodynamics of flapping wings . 2.1.1 Wagner Effect . . . . . . . 2.1.2 Leading edge vortex . . . 2.1.3 Clap and fling mechanism 2.1.4 Rotational lift . . . . . . . 2.1.5 Wing-wake interactions . 2.1.6 Lift force . . . . . . . . . 2.2 Flapping wings in nature . . . . 2.2.1 Insects . . . . . . . . . . . 2.2.2 Hummingbirds . . . . . . 2.2.3 Bats . . . . . . . . . . . . 2.2.4 Birds . . . . . . . . . . . . 2.3 Summary . . . . . . . . . . . . . 3 Concepts 3.1 General Considerations . . . . . 3.1.1 Objective characteristics 3.1.2 Flight control . . . . . . 3.1.3 Actuator . . . . . . . . 3.2 Concepts for wing flapping . . 3.2.1 Concept A . . . . . . . 3.2.2 Concept B . . . . . . . . 3.2.3 Concept C . . . . . . . 3.2.4 Concept D . . . . . . . 3.3 Concepts for wing pitching . . 3.3.1 Active pitching . . . . . 3.3.2 Passive pitching . . . . 4 Evaluation 4.1 Evaluation of concepts . . . . 4.1.1 Criteria . . . . . . . . 4.1.2 Flapping concepts . . 4.1.3 Pitching concepts . . . 4.2 Expected weight . . . . . . . 4.3 Expected power consumption iii iv 1 3 3 3 3 4 5 6 6 7 7 10 13 16 17 21 21 21 22 22 23 23 24 25 29 29 29 32 35 35 35 36 36 37 38

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . . . . . . . .

. . . . . .

. . . . . . i

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

5 CAD Design 5.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2 Transmission of motor torque . . . . . . . . . . . . . . . . . . . . . . 5.3 Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Conclusion A Motor datasheet

39 39 40 41 43 45

ii

Abstract
This project aims at the development of a bio-mimetic propulsion mechanism for a Flapping Wing Micro Aerial Vehicle, without considering the aerodynamics of the wings in the design. This artificial bird will be the size of approximately 1020cm. Therefor the aerodynamic phenomena in flapping flight are studied and summarized. It covers the leading-edge vortex (LEV), the clap-and-fling effect, rotational lift and wing wake interactions. This is followed by a review of natural flappers. The aerodynamic and kinematic pattern of hummingbirds, bats, insects and small birds are summarized. Based on this review several different concepts of mechanisms for flapping wings are generated, which are seperated for...
tracking img