Experimental and theoretical study for nonlinear aeroelastic behavior of a flexible rotor blade


Journal Article

The purpose of this paper is to study the flutter instability and forced response of a nonrotating flexible rotor blade model with a geometrical structural nonlinearity and a freeplay structural nonlinearity. The ONERA stall aerodynamic model is used. External excitations are provided by base harmonic excitations in the pitch angle and the chordwise direction, respectively. Two cases are considered in this paper. Case A is for a nonlinear blade structure with an unstalled unsteady aerodynamic model. Case B is for the nonlinear blade structure with a large effective mean angle of attack. The effects of the structural and aerodynamic nonlinearities and initial disturbance on instability and forced response behavior are discussed. A wind-tunnel test has also been carried out in the Duke University low-speed wind tunnel. The wind-tunnel tests show generally good agreement between theory and experiment for both static and dynamic behavior. Although the mathematical and experimental model of the nonrotating blade is different from the operational rotating hingeless rotor blade, the results from the experimental-theoretical correlation study provide fundamental understanding of the nonlinear aeroelastic behavior for a flexural-flexural-torsional hingeless rotor blade. © 1993 American Institute of Aeronautics and Astronautics, Inc., All rights reserved.

Full Text

Duke Authors

Cited Authors

  • Tang, DM; Dowell, EH

Published Date

  • January 1, 1993

Published In

Volume / Issue

  • 31 / 6

Start / End Page

  • 1133 - 1142

International Standard Serial Number (ISSN)

  • 0001-1452

Digital Object Identifier (DOI)

  • 10.2514/3.11738

Citation Source

  • Scopus