Header menu link for other important links
X
Uncertainty quantification of an airfoil control surface flutter system
Published in
2013
Pages: 5613 - 5618
Abstract
Aeroelastic instability and nonlinear dynamics of a wing control surface have been investigated with parametric uncertainties. The aeroelastic system has a combined nonlinearity of cubic soft spring and free-play. The system shows subcritical Hopf bifurcation in which a small amplitude Limit Cycle Oscillation (LCO) jumps to an infinitely large amplitude LCO. The subcritical behavior is due to the soft spring and the amplitude of the smaller LCO is controlled by the free-play. A fifth order stiffness is used to make the large LCO amplitude finite. Such systems when modeled with parametric uncertainty shows discontinuities in the response surface along the random domain. It is difficult to model the discontinuities in the response surface accurately using conventional spectral approaches and it results in erroneous response statistics. An intelligent interpolation called integrated interpolation scheme earlier proposed by the authors using a combination of linear and proximal interpolation has been used in the present work. The scheme uses equi-probable nodes as there is equal probability of the random variable lying between any of the node intervals. The deterministic runs are made only at these node points, thus giving considerable computational advantage over standard Monte Carlo Simulations (MCS). The interpolation algorithm is applied to the response surface to capture the sharp discontinuities. Response statistics have also been compared with that of a reference Monte Carlo Simulations (MCS). As the scheme is non-intrusive it can be applied to any dimension of random domain. © 2013 Taylor & Francis Group, London.
About the journal
JournalSafety, Reliability, Risk and Life-Cycle Performance of Structures and Infrastructures - Proceedings of the 11th International Conference on Structural Safety and Reliability, ICOSSAR 2013
Open AccessNo
Concepts (17)
  •  related image
    AEROELASTIC INSTABILITIES
  •  related image
    Computational advantages
  •  related image
    INTERPOLATION ALGORITHMS
  •  related image
    Limit cycle oscillation (lco)
  •  related image
    Monte-carlo simulations
  •  related image
    Parametric uncertainties
  •  related image
    Subcritical hopf bifurcation
  •  related image
    Uncertainty quantifications
  •  related image
    Aeroelasticity
  •  related image
    Algorithms
  •  related image
    Hopf bifurcation
  •  related image
    Interpolation
  •  related image
    Monte carlo methods
  •  related image
    Reliability
  •  related image
    Safety engineering
  •  related image
    Surface properties
  •  related image
    Control surfaces