Limit Cycle Oscillation and Domain of Stability in Prototypical Wing Sections with Unsteady Aerodynamics

Authors

Sahjendra N. Singh, University of Nevada, Las VegasFollow
Sushma Gujjula, University of Nevada, Las VegasFollow
Woosoon Yim, University of Nevada, Las VegasFollow

Document Type

Conference Proceeding

Publication Date

8-16-2004

Publication Title

Collection of Technical Papers - AIAA Guidance, Navigation, and Control Conference

Publisher

AIAA

Volume

2

First page number:

1180

Last page number:

1194

Abstract

The paper treats the question of the existence of limit cycle oscillations and domain of stability (attraction) of prototypical aeroelastic wing section with pitch structural nonlinearity using the describing function method. The model includes unsteady aerodynamics used for the limit cycle analysis. Analytical expression for the computation of the age value and the amplitude and frequent of oscillation of pitch and plunge responses are obtained. Interestingly, it is found that flutter can exist not only when the origins in the state space is unstable but also when it is asymptotically stable surrounding the origin in the state space us computed in which flutter cannot exist. The Nyquist criterion is used to establish the stability of the limit cycle and it is shown that unstable as well as the stable limit cycles exist when the origin is exponentially stable. Numerical results are presented for a set of values of the flow velocities and the locations of the elastic axis which show that the predicted limited cycle oscillation amplitude and frequency as well as the mean values are quite close to the actual values.

Keywords

Airplanes – Wings; Oscillations; Stability; Unsteady flow (Aerodynamics)

Disciplines

Aerodynamics and Fluid Mechanics | Aerospace Engineering | Mechanical Engineering

Language

English

Permissions

Use Find in Your Library, contact the author, or interlibrary loan to garner a copy of the item. Publisher policy does not allow archiving the final published version. If a post-print (author's peer-reviewed manuscript) is allowed and available, or publisher policy changes, the item will be deposited.

Repository Citation

Singh, S. N., Gujjula, S., Yim, W. (2004). Limit Cycle Oscillation and Domain of Stability in Prototypical Wing Sections with Unsteady Aerodynamics. Collection of Technical Papers - AIAA Guidance, Navigation, and Control Conference, 2 1180-1194. AIAA.