TY - GEN
T1 - Nonlinear analysis and identification of limit cycle oscillations in an aeroelastic system
AU - Abdelkefi, Abdessattar
AU - Vasconcellos, Rui
AU - Nayfeh, Ali H.
AU - Hajj, Muhammad R.
AU - Badran, Omar
PY - 2012
Y1 - 2012
N2 - The identification of a concentrated nonlinearity in the torsional spring of an aeroelastic system is performed. The system consists of a rigid airfoil that is supported by a linear spring in the plunge motion and a nonlinear spring in the pitch motion. Quadratic and cubic nonlinearities in the pitch moment are introduced to model the concentrated non- linearity. The aerodynamic loads are modeled using two different representations, namely, the quasi-steady approximation and the Duhamel formulation. Unlike the quasi-steady approximation which fails to correctly predict the flutter speed, the Duhamel formulation yielded accurate prediction for the flutter speed and frequency. The results show that the use of the Duhamel formulation to represent the aerodynamic loads yields excellent agreement between the experimental data and the numerical predictions.
AB - The identification of a concentrated nonlinearity in the torsional spring of an aeroelastic system is performed. The system consists of a rigid airfoil that is supported by a linear spring in the plunge motion and a nonlinear spring in the pitch motion. Quadratic and cubic nonlinearities in the pitch moment are introduced to model the concentrated non- linearity. The aerodynamic loads are modeled using two different representations, namely, the quasi-steady approximation and the Duhamel formulation. Unlike the quasi-steady approximation which fails to correctly predict the flutter speed, the Duhamel formulation yielded accurate prediction for the flutter speed and frequency. The results show that the use of the Duhamel formulation to represent the aerodynamic loads yields excellent agreement between the experimental data and the numerical predictions.
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U2 - 10.2514/6.2012-1790
DO - 10.2514/6.2012-1790
M3 - Conference contribution
AN - SCOPUS:85088756393
SN - 9781600869372
T3 - 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012
BT - 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012
T2 - 53rd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2012
Y2 - 23 April 2012 through 26 April 2012
ER -