Control of a three-degree-of-freedom airfoil with limit-cycle behavior

Journal Article (Journal Article)

The effect of control surface freeplay nonlinearities on the closed loop performance of a three-degree-of-freedom airfoil was investigated. The controllers designed for the linear system with flap restoring force serve to reduce the limit cycle oscillations (LCO) associated with pitch and plunge while maintaining the same level of LCO in the flap response as long as the flap response is included as a performance variable in the design of the compensator. The flap LCO frequency for the open loop nonlinear system is dominated by a frequency corresponding to the lunge resonance.

Full Text

Duke Authors

Cited Authors

  • Clark, RL; Dowell, EH; Frampton, KD

Published Date

  • January 1, 2000

Published In

Volume / Issue

  • 37 / 3

Start / End Page

  • 533 - 536

International Standard Serial Number (ISSN)

  • 0021-8669

Digital Object Identifier (DOI)

  • 10.2514/2.2632

Citation Source

  • Scopus