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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Airfoil control surface discontinuous nonlinearity experimental assessment and numerical model validation

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Author(s):
Vasconcellos, Rui M. G. [1] ; Abdelkefi, Abdessattar [2] ; Hajj, Muhammad R. [2] ; Almeida, Daniel P. [3] ; Marques, Flavio D. [3]
Total Authors: 5
Affiliation:
[1] Sao Paulo State Univ UNESP, Sao Joa Da Boa Vista, SP - Brazil
[2] Virginia Polytech Inst & State Univ, Dept Engn Sci & Mech, Blacksburg, VA 24061 - USA
[3] Univ Sao Paulo, Engn Sch Sao Carlos, Ave Trabalhador Sancarlense 400, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF VIBRATION AND CONTROL; v. 22, n. 6, p. 1633-1644, APR 2016.
Web of Science Citations: 6
Abstract

A variety of dynamic behaviors that may be encountered in aeroelastic systems with discontinuous nonlinearities has motivated investigations that may support future applications in flight controls design, flutter prediction, instability characterization and energy harvesting. In this paper, the case of an airfoil with control surface freeplay is assessed experimentally and modeled numerically using an alternative continuous approximation for the discontinuous nonlinearity based on hyperbolic tangent function representation. The unsteady aerodynamic loads are computed using the modified unsteady Theodorsen approximation for arbitrary motions. The validity of the proposed freeplay representation is performed through comparison with experimental data. Adjustments to the pitching restoring moments have been carried out to account for a smooth polynomial concentrated nonlinearity. Data analysis is performed to characterize and investigate the experimental signals. Sub-critical bifurcation behavior is observed from both experimental data and the numerical model prediction. The results confirm the validity of hyperbolic tangent function combinations for freeplay nonlinearity representation for the experimental setup conditions. (AU)

FAPESP's process: 07/08459-1 - Nonlinear aeroelastic time series analysis: an experimental study
Grantee:Rui Marcos Grombone de Vasconcellos
Support Opportunities: Scholarships in Brazil - Doctorate