The aeroelastic response of a wing section with a structural freeplay nonlinearity: An experimental investigation

Spectrographic analysis for the modal testing of nonlinear aeroelastic systems

“…The system responds with a LCO, at the frequency f 2 predicted by the sine-sweep test. It is of interest to note that this frequency is really a property of the aeroelastic system, and only a weak function of airspeed-a result that supports previous experimental work (Marsden and Price, 2005). The results also indicate that the frequency f 2 is essentially determined by the critical flutter speed of the equivalent linear system, with an additional dependence on airspeed.…”

Numerical investigation of the effects of structural geometric and material nonlinearities on limit-cycle oscillation of a cropped delta wing

“…The primary physical sources of the nonlinearities essential to the LCO are a subject of current debate among experts in aeroelasticity. The candidate sources are several: (i) for the structure, free-play (Marsden and Price, 2005), nonlinear damping (Dowell et al, 2003) and geometric nonlinearity (Demasi and Livne, 2009); and (ii) for the fluid, shock wave motion (Dietz et al, 2006) and flow separation (Sarkar and Bijl, 2008;Poirel and Yuan, 2010). Because the LCO phenomenon is associated with the nonlinear factors of the structure and/or aerodynamics, the investigation of wing LCO is of great theoretical and engineering importance.…”

By-pass transition to airfoil flutter by transient growth due to gust impulse

“…Other previous experimental studies have already dealt with nonlinear airfoil flutter, for instance by Marsden and Price (2005), but none of them have analysed the transient behaviour of such a system. Numerically, Lee et al (2005) have focused their investigation on the mechanisms leading to limit cycle oscillations.…”