Suppressing aeroelastic instability by means of broadband targeted energy transfers, part 2: Experiments

Suppressing Aeroelastic Instability; Targeted Energy Transfers; Aeroelastic Instability; nonlinear energy sink; rigid airfoil; limit cycle oscillation

Abstract :

[en] This paper presents experimental results corroborating the analysis developed in the companion paper, Part I (Lee, Y., Vakakis, A., Bergman, L., McFarland, M., and Kerschen G., "Suppression Aeroelastic Instability Using Broadband Passive Targeted Energy Transfers, Part 1: Theory," AIAA Journal, Vol. 45, No. 3, 2007, pp. 693-711), and demonstrates that a nonlinear energy sink can improve the stability of an aeroelastic system. The nonlinear energy sink was, in this case, attached to the heave (plunge) degree of freedom of a rigid airfoil which was supported in a low-speed wind tunnel by nonlinear springs separately adjustable in heave and pitch. This airfoil was found to exhibit a at flow speeds above the critical ('flutter") speed of 9.5 m/s, easily triggered by an initial heave displacement. After attachment of a single degree of freedom, essentially nonlinear energy sink to the wing, the combined system exhibited improved dynamic response as measured by the reduction or elimination of limit cycle oscillation at flow speeds significantly greater than the wing's critical speed. The design, application, and performance of the nonlinear energy sink are described herein, and the results obtained are compared to analytical predictions. The physics of the interaction of the sink with the wing is examined in detail.

Disciplines :

Mechanical engineering
Electrical & electronics engineering

Author, co-author :

Lee, Y. S.; University of Illinois at Urbana-Champaign > Department of Aerospace Engineering

Kerschen, Gaëtan ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux

McFarland, D. M.; University of Illinois at Urbana-Champaign > Department of Aerospace Engineering

Hill, W. J.; Texas A&M University > College Station

Nichkawde, C.; Texas A&M University > College Station

Strganac, T. W.; Texas A&M University, > College Station

Bergman, L. A.; University of Illinois at Urbana-Champaign > Department of Aerospace Engineering

Vakakis, Alexander F.; National Technical University of Athens > Department of Mechanical and Industrial Engineering

Language :

English

Title :

Suppressing aeroelastic instability by means of broadband targeted energy transfers, part 2: Experiments

Publication date :

October 2007

Journal title :

AIAA Journal

ISSN :

0001-1452

eISSN :

1533-385X

Publisher :

Amer Inst Aeronaut Astronaut, Reston, United States - Virginia

Volume :

Issue :

Pages :

2391-2400

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 10 August 2009

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Scopus citations^®

154

Scopus citations^®
without self-citations

128

OpenCitations

117

OpenAlex citations

157

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