2026-09-19T11:43:44Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/476682021-07-05T14:03:20Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
James Paduano.
Durand, Eric, 1973-
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
2009-10-01T15:30:50Z
2009-10-01T15:30:50Z
1998
1998
http://hdl.handle.net/1721.1/47668
42218034
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
Includes bibliographical references (p. 69-70).
The goal of this research is to develop a versatile and fast code to compute the unsteady lift and thrust forces generated by a flapping airfoil and apply it to engineering problems. We consider both plunging and pitching types of motion and develop a time marching simulation based on early work in unsteady aerodynamics. The ability of the code to compute lift and thrust forces is validated against published results. We then study ways to maximize thrust generation by considering sinusoidal and square motions and optimizing parameters such as flapping frequency, amplitude, and phase difference between pitch and plunge. Finally, the code is applied to the take-off problem of a micro- UAV to illustrate the ability of the code to compute transient forces. The novelty of this research resides in the consideration of square motions and the optimization of parameters to maximize thrust. Also, the ability of the code to show transient forces and yet run faster than real time makes it a valuable tool for a wide variety of applications.
by Eric Durand.
S.M.
81 p.
eng
Massachusetts Institute of Technology
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http://dspace.mit.edu/handle/1721.1/7582
Aeronautics and Astronautics
Time domain modeling of unsteady aerodynamic forces on a flapping airfoil
Thesis
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<Abstract>The goal of this research is to develop a versatile and fast code to compute the unsteady lift and thrust forces generated by a flapping airfoil and apply it to engineering problems. We consider both plunging and pitching types of motion and develop a time marching simulation based on early work in unsteady aerodynamics. The ability of the code to compute lift and thrust forces is validated against published results. We then study ways to maximize thrust generation by considering sinusoidal and square motions and optimizing parameters such as flapping frequency, amplitude, and phase difference between pitch and plunge. Finally, the code is applied to the take-off problem of a micro- UAV to illustrate the ability of the code to compute transient forces. The novelty of this research resides in the consideration of square motions and the optimization of parameters to maximize thrust. Also, the ability of the code to show transient forces and yet run faster than real time makes it a valuable tool for a wide variety of applications.</Abstract>
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