In the last few decades, there has been an increasing interest in the field of nonlinear
aeroelasticity. With substantial improvements in computing capabilities, the control surface …

This paper presents a review and assessment of more than six decades of research in
aeroelastic stability, including control-surface nonlinearities. The work covers free play …

Nonlinear effects such as friction and freeplay on the control surfaces can affect aeroelastic
dynamics during flight. In particular, these nonlinearities can induce limit cycle oscillations …

This paper presents an investigation about the dynamic response of a three-degree of
freedom airfoil with hardening nonlinearity in the pitching stiffness and free-play nonlinearity …

Free-play-induced nonlinear dynamic behavior has been one of the most important topics of
aeroelastic research in recent decades. In this paper, the describing function (DF) method is …

Modern methods of nonlinear dynamics including time histories, phase portraits, power
spectra, and Poincaré sections are used to characterize the stability and bifurcation regions …

Impacts are present in real aircraft movable surfaces, such as ailerons, flaps, rudder,
elevators, trim tabs among other secondary control surfaces leading to complex, dangerous …

This paper proposes a novel adaptive nonlinear controller based on neural-networks (NNs)
for active suppression of airfoil flutter (ASAF) from the optimal control perspective. Optimal …

Viscoelastic materials have been widely used for the purpose of passive vibration mitigation
in various types of mechanical systems, including, industrial machinery, civil structures and …

A technique aimed at neutralizing the presence of free-play effects in a control surface
actuation chain is presented. It is based on an adaptive inversion of a function …