The prediction of ﬂutter instabilities is very critical in aeroelstic wing design, as it limits the aircraft operational envelope. Aeroelastic structures that have nonlinear characteristics, as in highly ﬂexible wings, can exhibit limit cycle oscillations in the vicinity of the ﬂutter boundary. However, comprehensive characterization of these nonlinear oscillations can be challenging without a well established nonlinear mathematical or numerical model. In the present paper,control-based continuation (CBC) technique is used to characterize the nonlinear oscillatory dynamics of a physical aeroelastic system undergoing pre and post ﬂutter oscillations, without the use of a mathematical model. The aeroelastic system was represented by a two-dimensional wing with pitch and heave degrees of freedom, tested in the low turbulence wind tunnel of the University of Bristol. The aim of this research is to demonstrate the capability of the CBC technique to trace unstable periodic behavior through stabilizing unstable limit cycle oscillations. The results allowed to produce a full bifurcation diagram for a ﬂuttering wing proﬁle, despite the noisy turbulent ﬂow environment of the wind tunnel.
|Number of pages||9|
|Publication status||Published - 13 Sep 2019|
|Event||International Forum on Aeroelasticity and Structural Dynamics : IFASD 2019 - Savannah, Georgia, USA, Savannah, United States|
Duration: 10 Jun 2019 → 13 Jun 2019
|Conference||International Forum on Aeroelasticity and Structural Dynamics|
|Abbreviated title||IFASD 2019|
|Period||10/06/19 → 13/06/19|
- limit cycle oscillations
- Experimental bifurcation analysis
- Control-based continuation
Tartaruga, I., Barton, D. A. W., Rezgui, D., & Neild, S. A. (2019). Experimental bifurcation analysis of a wing profile. Paper presented at International Forum on Aeroelasticity and Structural Dynamics , Savannah, United States.